diff --git a/package-lock.json b/package-lock.json
index eb3313ef..a1405aad 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,2545 +1,4 @@
-{
-  "name": "sorokeep",
-  "version": "0.1.2",
-  "lockfileVersion": 3,
-  "requires": true,
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-      "name": "sorokeep",
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-        "pino": "^10.3.1",
-        "pino-pretty": "^13.1.3",
-        "yaml": "^2.8.4"
-      },
-      "bin": {
-        "sorokeep": "dist/index.js"
-      },
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-        "@types/better-sqlite3": "^7.6.13",
-        "@types/node": "^25.6.2",
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-    "node_modules/lightningcss-win32-arm64-msvc": {
-      "version": "1.32.0",
-      "resolved": "https://registry.npmjs.org/lightningcss-win32-arm64-msvc/-/lightningcss-win32-arm64-msvc-1.32.0.tgz",
-      "integrity": "sha512-8SbC8BR40pS6baCM8sbtYDSwEVQd4JlFTOlaD3gWGHfThTcABnNDBda6eTZeqbofalIJhFx0qKzgHJmcPTnGdw==",
-      "cpu": [
-        "arm64"
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@@ -3737,14 +986,6 @@
         "typescript": ">=4.8.4"
       }
     },
-    "node_modules/tslib": {
-      "version": "2.8.1",
-      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
-      "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
-      "dev": true,
-      "license": "0BSD",
-      "optional": true
-    },
     "node_modules/tsx": {
       "version": "4.21.0",
       "dev": true,
diff --git a/package.json b/package.json
index b7261c83..6b80a350 100644
--- a/package.json
+++ b/package.json
@@ -12,9 +12,8 @@
     "dev": "tsx src/index.ts",
     "lint": "eslint src/ tests/",
     "test": "vitest run",
-    "test:watch": "vitest",
-    "docker:build": "docker build -t sorokeep .",
-    "docker:run": "docker run --rm -v sorokeep-data:/home/sorokeep/.sorokeep sorokeep"
+    "test:e2e": "vitest run tests/e2e",
+    "test:watch": "vitest"
   },
   "keywords": [
     "stellar",
diff --git a/src/rpc/client.ts b/src/rpc/client.ts
index c28be61e..40e3e6e1 100644
--- a/src/rpc/client.ts
+++ b/src/rpc/client.ts
@@ -7,6 +7,7 @@ import {
     Account,
     Operation,
     Keypair,
+    SorobanDataBuilder,
 } from "@stellar/stellar-sdk";
 import { getLogger } from "../logging/index.js";
 
@@ -80,7 +81,7 @@ export class StellarRpcClient {
         if (!url) {
             throw new Error(`Unknown network "${network}". Use "testnet", "mainnet", or provide a custom URL.`);
         }
-        this.server = new rpc.Server(url);
+        this.server = new rpc.Server(url, { allowHttp: url.startsWith("http://") });
     }
 
     getNetwork(): string {
@@ -94,8 +95,12 @@ export class StellarRpcClient {
     async getCurrentLedger(): Promise<number> {
         const serverAny = this.server as any;
         if (typeof serverAny.getLatestLedger === "function") {
-            const response = await serverAny.getLatestLedger();
-            if (response && typeof response.sequence === "number") return response.sequence;
+            try {
+                const response = await serverAny.getLatestLedger();
+                if (response && typeof response.sequence === "number") return response.sequence;
+            } catch (error) {
+                logger.debug("getLatestLedger failed, falling back to getHealth", error);
+            }
         }
 
         const health = await this.server.getHealth();
@@ -252,7 +257,7 @@ export class StellarRpcClient {
             )
             .setTimeout(30)
             .setSorobanData(
-                new (rpc as any).SorobanDataBuilder()
+                new SorobanDataBuilder()
                     .setReadOnly(keys)
                     .build(),
             )
@@ -305,7 +310,7 @@ export class StellarRpcClient {
             )
             .setTimeout(30)
             .setSorobanData(
-                new (rpc as any).SorobanDataBuilder()
+                new SorobanDataBuilder()
                     .setReadOnly(keys)
                     .build(),
             )
@@ -372,7 +377,7 @@ export class StellarRpcClient {
             )
             .setTimeout(30)
             .setSorobanData(
-                new (rpc as any).SorobanDataBuilder()
+                new SorobanDataBuilder()
                     .setReadWrite(keys)
                     .build(),
             )
diff --git a/tests/e2e/README.md b/tests/e2e/README.md
new file mode 100644
index 00000000..ac363e98
--- /dev/null
+++ b/tests/e2e/README.md
@@ -0,0 +1,349 @@
+import { createHash } from "node:crypto";
+import { createServer, type IncomingMessage, type Server, type ServerResponse } from "node:http";
+import { AddressInfo } from "node:net";
+import {
+    Contract,
+    Keypair,
+    StrKey,
+    xdr,
+} from "@stellar/stellar-sdk";
+
+const SANDBOX_PASSPHRASE = "Sorokeep E2E Sandbox Network ; June 2026";
+
+interface SandboxEntry {
+    key: xdr.LedgerKey;
+    val: xdr.LedgerEntryData;
+    liveUntilLedgerSeq: number;
+    lastModifiedLedgerSeq: number;
+}
+
+interface SubmittedTransaction {
+    hash: string;
+    ledger: number;
+    envelopeXdr: string;
+}
+
+export interface SandboxDeployment {
+    contractId: string;
+    wasmHashHex: string;
+    instanceKeyXdr: string;
+    wasmKeyXdr: string;
+}
+
+export class InMemorySorobanSandbox {
+    private server: Server | undefined;
+    private entries = new Map<string, SandboxEntry>();
+    private submittedTransactions = new Map<string, SubmittedTransaction>();
+
+    latestLedger: number;
+    rpcUrl = "";
+
+    private constructor(initialLedger: number) {
+        this.latestLedger = initialLedger;
+    }
+
+    static async start(options?: { initialLedger?: number }): Promise<InMemorySorobanSandbox> {
+        const sandbox = new InMemorySorobanSandbox(options?.initialLedger ?? 1000);
+        await sandbox.listen();
+        return sandbox;
+    }
+
+    async stop(): Promise<void> {
+        if (!this.server) return;
+        await new Promise<void>((resolve, reject) => {
+            this.server!.close((err) => err ? reject(err) : resolve());
+        });
+        this.server = undefined;
+    }
+
+    deployTestContract(options?: { ttlLedgers?: number; contractSeedByte?: number }): SandboxDeployment {
+        const ttlLedgers = options?.ttlLedgers ?? 6;
+        const seed = options?.contractSeedByte ?? 1;
+        const contractId = StrKey.encodeContract(Buffer.alloc(32, seed));
+        const contract = new Contract(contractId);
+        const instanceKey = contract.getFootprint();
+        const instanceKeyData = instanceKey.contractData();
+        const wasmHash = Buffer.alloc(32, seed + 1);
+
+        const instance = new xdr.ScContractInstance({
+            executable: xdr.ContractExecutable.contractExecutableWasm(wasmHash),
+            storage: null,
+        });
+        const instanceData = xdr.LedgerEntryData.contractData(new xdr.ContractDataEntry({
+            ext: new xdr.ExtensionPoint(0),
+            contract: instanceKeyData.contract(),
+            key: instanceKeyData.key(),
+            durability: xdr.ContractDataDurability.persistent(),
+            val: xdr.ScVal.scvContractInstance(instance),
+        }));
+
+        const wasmKey = xdr.LedgerKey.contractCode(new xdr.LedgerKeyContractCode({ hash: wasmHash }));
+        const wasmData = xdr.LedgerEntryData.contractCode(new xdr.ContractCodeEntry({
+            ext: new xdr.ContractCodeEntryExt(0),
+            hash: wasmHash,
+            code: Buffer.from("0061736d01000000", "hex"),
+        }));
+
+        this.putEntry(instanceKey, instanceData, ttlLedgers);
+        this.putEntry(wasmKey, wasmData, ttlLedgers + 1);
+
+        return {
+            contractId,
+            wasmHashHex: wasmHash.toString("hex"),
+            instanceKeyXdr: instanceKey.toXDR("base64"),
+            wasmKeyXdr: wasmKey.toXDR("base64"),
+        };
+    }
+
+    advanceLedgers(count: number): void {
+        if (count < 0) throw new Error("Cannot move sandbox ledger backwards");
+        this.latestLedger += count;
+    }
+
+    remainingTtl(entryKeyXdr: string): number | undefined {
+        const entry = this.entries.get(entryKeyXdr);
+        return entry ? entry.liveUntilLedgerSeq - this.latestLedger : undefined;
+    }
+
+    private putEntry(key: xdr.LedgerKey, val: xdr.LedgerEntryData, ttlLedgers: number): void {
+        this.entries.set(key.toXDR("base64"), {
+            key,
+            val,
+            liveUntilLedgerSeq: this.latestLedger + ttlLedgers,
+            lastModifiedLedgerSeq: this.latestLedger,
+        });
+    }
+
+    private async listen(): Promise<void> {
+        this.server = createServer((request, response) => {
+            void this.handleRequest(request, response);
+        });
+
+        await new Promise<void>((resolve) => this.server!.listen(0, "127.0.0.1", resolve));
+        const address = this.server.address() as AddressInfo;
+        this.rpcUrl = `http://127.0.0.1:${address.port}`;
+    }
+
+    private async handleRequest(request: IncomingMessage, response: ServerResponse): Promise<void> {
+        if (request.method !== "POST") {
+            this.writeJson(response, 405, { error: "Only POST is supported" });
+            return;
+        }
+
+        const body = await this.readBody(request);
+        let payload: { id?: unknown; method?: string; params?: any };
+        try {
+            payload = JSON.parse(body);
+        } catch {
+            this.writeJson(response, 400, { error: "Invalid JSON" });
+            return;
+        }
+
+        try {
+            const result = this.dispatch(payload.method, payload.params ?? {});
+            this.writeJson(response, 200, { jsonrpc: "2.0", id: payload.id ?? 1, result });
+        } catch (error) {
+            this.writeJson(response, 200, {
+                jsonrpc: "2.0",
+                id: payload.id ?? 1,
+                error: { code: -32000, message: error instanceof Error ? error.message : String(error) },
+            });
+        }
+    }
+
+    private dispatch(method: string | undefined, params: any): unknown {
+        switch (method) {
+            case "getHealth":
+                return {
+                    status: "healthy",
+                    latestLedger: this.latestLedger,
+                    oldestLedger: Math.max(1, this.latestLedger - 1000),
+                    ledgerRetentionWindow: 1000,
+                };
+            case "getNetwork":
+                return {
+                    passphrase: SANDBOX_PASSPHRASE,
+                    protocolVersion: "23",
+                };
+            case "getLedgerEntries":
+                return this.getLedgerEntries(params.keys ?? []);
+            case "simulateTransaction":
+                return this.simulateTransaction(params.transaction);
+            case "sendTransaction":
+                return this.sendTransaction(params.transaction);
+            case "getTransaction":
+                return this.getTransaction(params.hash);
+            default:
+                throw new Error(`Unsupported sandbox RPC method: ${method}`);
+        }
+    }
+
+    private getLedgerEntries(keyXdrs: string[]): unknown {
+        const entries = keyXdrs.flatMap((keyXdr) => {
+            const key = xdr.LedgerKey.fromXDR(keyXdr, "base64");
+
+            if (key.switch().name === "account") {
+                return [this.accountLedgerEntry(key)];
+            }
+
+            const entry = this.entries.get(keyXdr);
+            if (!entry || entry.liveUntilLedgerSeq <= this.latestLedger) return [];
+
+            return [{
+                key: entry.key.toXDR("base64"),
+                xdr: entry.val.toXDR("base64"),
+                lastModifiedLedgerSeq: entry.lastModifiedLedgerSeq,
+                liveUntilLedgerSeq: entry.liveUntilLedgerSeq,
+            }];
+        });
+
+        return { latestLedger: this.latestLedger, entries };
+    }
+
+    private accountLedgerEntry(key: xdr.LedgerKey): unknown {
+        const accountId = key.account().accountId();
+        const account = new xdr.AccountEntry({
+            accountId,
+            balance: xdr.Int64.fromString("100000000000"),
+            seqNum: xdr.Int64.fromString("123456789") as any,
+            numSubEntries: 0,
+            inflationDest: null,
+            flags: 0,
+            homeDomain: "",
+            thresholds: Buffer.from([1, 1, 1, 1]),
+            signers: [],
+            ext: new xdr.AccountEntryExt(0),
+        });
+
+        return {
+            key: key.toXDR("base64"),
+            xdr: xdr.LedgerEntryData.account(account).toXDR("base64"),
+            lastModifiedLedgerSeq: this.latestLedger,
+            liveUntilLedgerSeq: this.latestLedger + 1_000_000,
+        };
+    }
+
+    private simulateTransaction(transactionXdr: string): unknown {
+        const sorobanData = this.sorobanDataFromTransaction(transactionXdr);
+        return {
+            id: "1",
+            latestLedger: this.latestLedger,
+            transactionData: sorobanData.toXDR("base64"),
+            minResourceFee: "100",
+            events: [],
+            results: [],
+        };
+    }
+
+    private sendTransaction(transactionXdr: string): unknown {
+        const envelope = xdr.TransactionEnvelope.fromXDR(transactionXdr, "base64");
+        const tx = envelope.v1().tx();
+        const operation = tx.operations()[0];
+        if (!operation) throw new Error("Sandbox only supports single-operation transactions");
+
+        if (operation.body().switch().name === "extendFootprintTtl") {
+            const extendTo = operation.body().extendFootprintTtlOp().extendTo();
+            const sorobanData = tx.ext().value();
+            if (!sorobanData || typeof (sorobanData as any).resources !== "function") {
+                throw new Error("Missing Soroban transaction data");
+            }
+            const footprint = (sorobanData as xdr.SorobanTransactionData).resources().footprint();
+            for (const key of footprint.readOnly()) {
+                const keyXdr = key.toXDR("base64");
+                const entry = this.entries.get(keyXdr);
+                if (!entry || entry.liveUntilLedgerSeq <= this.latestLedger) {
+                    throw new Error(`Cannot extend missing or archived entry ${keyXdr}`);
+                }
+                entry.liveUntilLedgerSeq = this.latestLedger + extendTo;
+                entry.lastModifiedLedgerSeq = this.latestLedger;
+            }
+        } else if (operation.body().switch().name !== "restoreFootprint") {
+            throw new Error(`Unsupported sandbox operation: ${operation.body().switch().name}`);
+        }
+
+        this.latestLedger += 1;
+        const hash = createHash("sha256").update(transactionXdr).digest("hex");
+        this.submittedTransactions.set(hash, { hash, ledger: this.latestLedger, envelopeXdr: transactionXdr });
+
+        return {
+            status: "PENDING",
+            hash,
+            latestLedger: this.latestLedger,
+            latestLedgerCloseTime: Date.now(),
+        };
+    }
+
+    private getTransaction(hash: string): unknown {
+        const submitted = this.submittedTransactions.get(hash);
+        if (!submitted) {
+            return {
+                status: "NOT_FOUND",
+                txHash: hash,
+                latestLedger: this.latestLedger,
+                latestLedgerCloseTime: Date.now(),
+                oldestLedger: Math.max(1, this.latestLedger - 1000),
+                oldestLedgerCloseTime: Date.now(),
+            };
+        }
+
+        return {
+            status: "SUCCESS",
+            txHash: hash,
+            ledger: submitted.ledger,
+            latestLedger: this.latestLedger,
+            latestLedgerCloseTime: Date.now(),
+            oldestLedger: Math.max(1, this.latestLedger - 1000),
+            oldestLedgerCloseTime: Date.now(),
+            applicationOrder: 1,
+            feeBump: false,
+            envelopeXdr: submitted.envelopeXdr,
+            resultXdr: this.successResultXdr(),
+            resultMetaXdr: this.successMetaXdr(),
+            events: { contractEventsXdr: [], transactionEventsXdr: [] },
+            createdAt: new Date().toISOString(),
+        };
+    }
+
+    private sorobanDataFromTransaction(transactionXdr: string): xdr.SorobanTransactionData {
+        const envelope = xdr.TransactionEnvelope.fromXDR(transactionXdr, "base64");
+        const sorobanData = envelope.v1().tx().ext().value();
+        if (!sorobanData) throw new Error("Missing Soroban transaction data");
+        return sorobanData;
+    }
+
+    private successResultXdr(): string {
+        return new xdr.TransactionResult({
+            feeCharged: xdr.Int64.fromString("100"),
+            result: xdr.TransactionResultResult.txSuccess([]),
+            ext: new xdr.TransactionResultExt(0),
+        }).toXDR("base64");
+    }
+
+    private successMetaXdr(): string {
+        return new xdr.TransactionMeta(3, new xdr.TransactionMetaV3({
+            ext: new xdr.ExtensionPoint(0),
+            txChangesBefore: [],
+            operations: [],
+            txChangesAfter: [],
+            sorobanMeta: null,
+        })).toXDR("base64");
+    }
+
+    private readBody(request: IncomingMessage): Promise<string> {
+        return new Promise((resolve, reject) => {
+            const chunks: Buffer[] = [];
+            request.on("data", (chunk) => chunks.push(Buffer.from(chunk)));
+            request.on("end", () => resolve(Buffer.concat(chunks).toString("utf8")));
+            request.on("error", reject);
+        });
+    }
+
+    private writeJson(response: ServerResponse, statusCode: number, payload: unknown): void {
+        response.writeHead(statusCode, { "content-type": "application/json" });
+        response.end(JSON.stringify(payload));
+    }
+}
+
+export function fundedSandboxKeypair(): Keypair {
+    return Keypair.random();
+}
\ No newline at end of file
diff --git a/tests/e2e/helpers/in-memory-soroban-sandbox.ts b/tests/e2e/helpers/in-memory-soroban-sandbox.ts
new file mode 100644
index 00000000..ac363e98
--- /dev/null
+++ b/tests/e2e/helpers/in-memory-soroban-sandbox.ts
@@ -0,0 +1,349 @@
+import { createHash } from "node:crypto";
+import { createServer, type IncomingMessage, type Server, type ServerResponse } from "node:http";
+import { AddressInfo } from "node:net";
+import {
+    Contract,
+    Keypair,
+    StrKey,
+    xdr,
+} from "@stellar/stellar-sdk";
+
+const SANDBOX_PASSPHRASE = "Sorokeep E2E Sandbox Network ; June 2026";
+
+interface SandboxEntry {
+    key: xdr.LedgerKey;
+    val: xdr.LedgerEntryData;
+    liveUntilLedgerSeq: number;
+    lastModifiedLedgerSeq: number;
+}
+
+interface SubmittedTransaction {
+    hash: string;
+    ledger: number;
+    envelopeXdr: string;
+}
+
+export interface SandboxDeployment {
+    contractId: string;
+    wasmHashHex: string;
+    instanceKeyXdr: string;
+    wasmKeyXdr: string;
+}
+
+export class InMemorySorobanSandbox {
+    private server: Server | undefined;
+    private entries = new Map<string, SandboxEntry>();
+    private submittedTransactions = new Map<string, SubmittedTransaction>();
+
+    latestLedger: number;
+    rpcUrl = "";
+
+    private constructor(initialLedger: number) {
+        this.latestLedger = initialLedger;
+    }
+
+    static async start(options?: { initialLedger?: number }): Promise<InMemorySorobanSandbox> {
+        const sandbox = new InMemorySorobanSandbox(options?.initialLedger ?? 1000);
+        await sandbox.listen();
+        return sandbox;
+    }
+
+    async stop(): Promise<void> {
+        if (!this.server) return;
+        await new Promise<void>((resolve, reject) => {
+            this.server!.close((err) => err ? reject(err) : resolve());
+        });
+        this.server = undefined;
+    }
+
+    deployTestContract(options?: { ttlLedgers?: number; contractSeedByte?: number }): SandboxDeployment {
+        const ttlLedgers = options?.ttlLedgers ?? 6;
+        const seed = options?.contractSeedByte ?? 1;
+        const contractId = StrKey.encodeContract(Buffer.alloc(32, seed));
+        const contract = new Contract(contractId);
+        const instanceKey = contract.getFootprint();
+        const instanceKeyData = instanceKey.contractData();
+        const wasmHash = Buffer.alloc(32, seed + 1);
+
+        const instance = new xdr.ScContractInstance({
+            executable: xdr.ContractExecutable.contractExecutableWasm(wasmHash),
+            storage: null,
+        });
+        const instanceData = xdr.LedgerEntryData.contractData(new xdr.ContractDataEntry({
+            ext: new xdr.ExtensionPoint(0),
+            contract: instanceKeyData.contract(),
+            key: instanceKeyData.key(),
+            durability: xdr.ContractDataDurability.persistent(),
+            val: xdr.ScVal.scvContractInstance(instance),
+        }));
+
+        const wasmKey = xdr.LedgerKey.contractCode(new xdr.LedgerKeyContractCode({ hash: wasmHash }));
+        const wasmData = xdr.LedgerEntryData.contractCode(new xdr.ContractCodeEntry({
+            ext: new xdr.ContractCodeEntryExt(0),
+            hash: wasmHash,
+            code: Buffer.from("0061736d01000000", "hex"),
+        }));
+
+        this.putEntry(instanceKey, instanceData, ttlLedgers);
+        this.putEntry(wasmKey, wasmData, ttlLedgers + 1);
+
+        return {
+            contractId,
+            wasmHashHex: wasmHash.toString("hex"),
+            instanceKeyXdr: instanceKey.toXDR("base64"),
+            wasmKeyXdr: wasmKey.toXDR("base64"),
+        };
+    }
+
+    advanceLedgers(count: number): void {
+        if (count < 0) throw new Error("Cannot move sandbox ledger backwards");
+        this.latestLedger += count;
+    }
+
+    remainingTtl(entryKeyXdr: string): number | undefined {
+        const entry = this.entries.get(entryKeyXdr);
+        return entry ? entry.liveUntilLedgerSeq - this.latestLedger : undefined;
+    }
+
+    private putEntry(key: xdr.LedgerKey, val: xdr.LedgerEntryData, ttlLedgers: number): void {
+        this.entries.set(key.toXDR("base64"), {
+            key,
+            val,
+            liveUntilLedgerSeq: this.latestLedger + ttlLedgers,
+            lastModifiedLedgerSeq: this.latestLedger,
+        });
+    }
+
+    private async listen(): Promise<void> {
+        this.server = createServer((request, response) => {
+            void this.handleRequest(request, response);
+        });
+
+        await new Promise<void>((resolve) => this.server!.listen(0, "127.0.0.1", resolve));
+        const address = this.server.address() as AddressInfo;
+        this.rpcUrl = `http://127.0.0.1:${address.port}`;
+    }
+
+    private async handleRequest(request: IncomingMessage, response: ServerResponse): Promise<void> {
+        if (request.method !== "POST") {
+            this.writeJson(response, 405, { error: "Only POST is supported" });
+            return;
+        }
+
+        const body = await this.readBody(request);
+        let payload: { id?: unknown; method?: string; params?: any };
+        try {
+            payload = JSON.parse(body);
+        } catch {
+            this.writeJson(response, 400, { error: "Invalid JSON" });
+            return;
+        }
+
+        try {
+            const result = this.dispatch(payload.method, payload.params ?? {});
+            this.writeJson(response, 200, { jsonrpc: "2.0", id: payload.id ?? 1, result });
+        } catch (error) {
+            this.writeJson(response, 200, {
+                jsonrpc: "2.0",
+                id: payload.id ?? 1,
+                error: { code: -32000, message: error instanceof Error ? error.message : String(error) },
+            });
+        }
+    }
+
+    private dispatch(method: string | undefined, params: any): unknown {
+        switch (method) {
+            case "getHealth":
+                return {
+                    status: "healthy",
+                    latestLedger: this.latestLedger,
+                    oldestLedger: Math.max(1, this.latestLedger - 1000),
+                    ledgerRetentionWindow: 1000,
+                };
+            case "getNetwork":
+                return {
+                    passphrase: SANDBOX_PASSPHRASE,
+                    protocolVersion: "23",
+                };
+            case "getLedgerEntries":
+                return this.getLedgerEntries(params.keys ?? []);
+            case "simulateTransaction":
+                return this.simulateTransaction(params.transaction);
+            case "sendTransaction":
+                return this.sendTransaction(params.transaction);
+            case "getTransaction":
+                return this.getTransaction(params.hash);
+            default:
+                throw new Error(`Unsupported sandbox RPC method: ${method}`);
+        }
+    }
+
+    private getLedgerEntries(keyXdrs: string[]): unknown {
+        const entries = keyXdrs.flatMap((keyXdr) => {
+            const key = xdr.LedgerKey.fromXDR(keyXdr, "base64");
+
+            if (key.switch().name === "account") {
+                return [this.accountLedgerEntry(key)];
+            }
+
+            const entry = this.entries.get(keyXdr);
+            if (!entry || entry.liveUntilLedgerSeq <= this.latestLedger) return [];
+
+            return [{
+                key: entry.key.toXDR("base64"),
+                xdr: entry.val.toXDR("base64"),
+                lastModifiedLedgerSeq: entry.lastModifiedLedgerSeq,
+                liveUntilLedgerSeq: entry.liveUntilLedgerSeq,
+            }];
+        });
+
+        return { latestLedger: this.latestLedger, entries };
+    }
+
+    private accountLedgerEntry(key: xdr.LedgerKey): unknown {
+        const accountId = key.account().accountId();
+        const account = new xdr.AccountEntry({
+            accountId,
+            balance: xdr.Int64.fromString("100000000000"),
+            seqNum: xdr.Int64.fromString("123456789") as any,
+            numSubEntries: 0,
+            inflationDest: null,
+            flags: 0,
+            homeDomain: "",
+            thresholds: Buffer.from([1, 1, 1, 1]),
+            signers: [],
+            ext: new xdr.AccountEntryExt(0),
+        });
+
+        return {
+            key: key.toXDR("base64"),
+            xdr: xdr.LedgerEntryData.account(account).toXDR("base64"),
+            lastModifiedLedgerSeq: this.latestLedger,
+            liveUntilLedgerSeq: this.latestLedger + 1_000_000,
+        };
+    }
+
+    private simulateTransaction(transactionXdr: string): unknown {
+        const sorobanData = this.sorobanDataFromTransaction(transactionXdr);
+        return {
+            id: "1",
+            latestLedger: this.latestLedger,
+            transactionData: sorobanData.toXDR("base64"),
+            minResourceFee: "100",
+            events: [],
+            results: [],
+        };
+    }
+
+    private sendTransaction(transactionXdr: string): unknown {
+        const envelope = xdr.TransactionEnvelope.fromXDR(transactionXdr, "base64");
+        const tx = envelope.v1().tx();
+        const operation = tx.operations()[0];
+        if (!operation) throw new Error("Sandbox only supports single-operation transactions");
+
+        if (operation.body().switch().name === "extendFootprintTtl") {
+            const extendTo = operation.body().extendFootprintTtlOp().extendTo();
+            const sorobanData = tx.ext().value();
+            if (!sorobanData || typeof (sorobanData as any).resources !== "function") {
+                throw new Error("Missing Soroban transaction data");
+            }
+            const footprint = (sorobanData as xdr.SorobanTransactionData).resources().footprint();
+            for (const key of footprint.readOnly()) {
+                const keyXdr = key.toXDR("base64");
+                const entry = this.entries.get(keyXdr);
+                if (!entry || entry.liveUntilLedgerSeq <= this.latestLedger) {
+                    throw new Error(`Cannot extend missing or archived entry ${keyXdr}`);
+                }
+                entry.liveUntilLedgerSeq = this.latestLedger + extendTo;
+                entry.lastModifiedLedgerSeq = this.latestLedger;
+            }
+        } else if (operation.body().switch().name !== "restoreFootprint") {
+            throw new Error(`Unsupported sandbox operation: ${operation.body().switch().name}`);
+        }
+
+        this.latestLedger += 1;
+        const hash = createHash("sha256").update(transactionXdr).digest("hex");
+        this.submittedTransactions.set(hash, { hash, ledger: this.latestLedger, envelopeXdr: transactionXdr });
+
+        return {
+            status: "PENDING",
+            hash,
+            latestLedger: this.latestLedger,
+            latestLedgerCloseTime: Date.now(),
+        };
+    }
+
+    private getTransaction(hash: string): unknown {
+        const submitted = this.submittedTransactions.get(hash);
+        if (!submitted) {
+            return {
+                status: "NOT_FOUND",
+                txHash: hash,
+                latestLedger: this.latestLedger,
+                latestLedgerCloseTime: Date.now(),
+                oldestLedger: Math.max(1, this.latestLedger - 1000),
+                oldestLedgerCloseTime: Date.now(),
+            };
+        }
+
+        return {
+            status: "SUCCESS",
+            txHash: hash,
+            ledger: submitted.ledger,
+            latestLedger: this.latestLedger,
+            latestLedgerCloseTime: Date.now(),
+            oldestLedger: Math.max(1, this.latestLedger - 1000),
+            oldestLedgerCloseTime: Date.now(),
+            applicationOrder: 1,
+            feeBump: false,
+            envelopeXdr: submitted.envelopeXdr,
+            resultXdr: this.successResultXdr(),
+            resultMetaXdr: this.successMetaXdr(),
+            events: { contractEventsXdr: [], transactionEventsXdr: [] },
+            createdAt: new Date().toISOString(),
+        };
+    }
+
+    private sorobanDataFromTransaction(transactionXdr: string): xdr.SorobanTransactionData {
+        const envelope = xdr.TransactionEnvelope.fromXDR(transactionXdr, "base64");
+        const sorobanData = envelope.v1().tx().ext().value();
+        if (!sorobanData) throw new Error("Missing Soroban transaction data");
+        return sorobanData;
+    }
+
+    private successResultXdr(): string {
+        return new xdr.TransactionResult({
+            feeCharged: xdr.Int64.fromString("100"),
+            result: xdr.TransactionResultResult.txSuccess([]),
+            ext: new xdr.TransactionResultExt(0),
+        }).toXDR("base64");
+    }
+
+    private successMetaXdr(): string {
+        return new xdr.TransactionMeta(3, new xdr.TransactionMetaV3({
+            ext: new xdr.ExtensionPoint(0),
+            txChangesBefore: [],
+            operations: [],
+            txChangesAfter: [],
+            sorobanMeta: null,
+        })).toXDR("base64");
+    }
+
+    private readBody(request: IncomingMessage): Promise<string> {
+        return new Promise((resolve, reject) => {
+            const chunks: Buffer[] = [];
+            request.on("data", (chunk) => chunks.push(Buffer.from(chunk)));
+            request.on("end", () => resolve(Buffer.concat(chunks).toString("utf8")));
+            request.on("error", reject);
+        });
+    }
+
+    private writeJson(response: ServerResponse, statusCode: number, payload: unknown): void {
+        response.writeHead(statusCode, { "content-type": "application/json" });
+        response.end(JSON.stringify(payload));
+    }
+}
+
+export function fundedSandboxKeypair(): Keypair {
+    return Keypair.random();
+}
\ No newline at end of file
diff --git a/tests/e2e/sandbox-network.test.ts b/tests/e2e/sandbox-network.test.ts
new file mode 100644
index 00000000..d6738712
--- /dev/null
+++ b/tests/e2e/sandbox-network.test.ts
@@ -0,0 +1,93 @@
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+import type Database from "better-sqlite3";
+import { getDatabaseForTesting } from "../../src/db/database.js";
+import { watchContract } from "../../src/core/watch.js";
+import { runMonitorCycle } from "../../src/core/monitor.js";
+import { runAutoExtensions } from "../../src/core/extension.js";
+import {
+    getAlertHistory,
+    getEntriesForContract,
+    getExtensionHistory,
+    insertAlertConfig,
+    upsertExtensionPolicy,
+} from "../../src/db/repositories.js";
+import { fundedSandboxKeypair, InMemorySorobanSandbox } from "./helpers/in-memory-soroban-sandbox.js";
+
+describe("E2E sandbox network TTL lifecycle", () => {
+    let db: Database.Database;
+    let sandbox: InMemorySorobanSandbox;
+
+    beforeEach(async () => {
+        db = getDatabaseForTesting();
+        sandbox = await InMemorySorobanSandbox.start({ initialLedger: 10_000 });
+    });
+
+    afterEach(async () => {
+        await sandbox.stop();
+        db.close();
+    });
+
+    it("bootstraps a local sandbox, deploys a test contract, watches it, auto-extends low TTL entries, and verifies recovery", async () => {
+        const deployment = sandbox.deployTestContract({ ttlLedgers: 6 });
+        const maintenanceKeypair = fundedSandboxKeypair();
+
+        const watchResult = await watchContract(db, {
+            contractId: deployment.contractId,
+            network: "sandbox",
+            name: "E2E Test Contract",
+            rpcUrl: sandbox.rpcUrl,
+        });
+
+        expect(watchResult.success).toBe(true);
+        expect(getEntriesForContract(db, deployment.contractId).map((entry) => entry.entry_type).sort())
+            .toEqual(["instance", "wasm"]);
+
+        insertAlertConfig(db, {
+            contract_id: deployment.contractId,
+            channel_type: "webhook",
+            channel_target: "http://127.0.0.1:9/e2e-alert-sink",
+            threshold_ledgers: 5,
+            webhook_secret: "e2e-secret",
+        });
+        upsertExtensionPolicy(db, {
+            contract_id: deployment.contractId,
+            enabled: true,
+            target_ttl_ledgers: 50,
+            extend_when_below_ledgers: 5,
+            keypair_public: maintenanceKeypair.publicKey(),
+            keypair_source: maintenanceKeypair.secret(),
+        });
+
+        sandbox.advanceLedgers(3);
+        expect(sandbox.remainingTtl(deployment.instanceKeyXdr)).toBe(3);
+
+        const lowTtlCycle = await runMonitorCycle(db, "sandbox", sandbox.rpcUrl);
+        expect(lowTtlCycle.errors).toEqual([]);
+        expect(lowTtlCycle.contractsChecked).toBe(1);
+        expect(lowTtlCycle.entriesUpdated).toBe(2);
+        expect(lowTtlCycle.thresholdsCrossed).toBeGreaterThanOrEqual(1);
+
+        const autoExtension = await runAutoExtensions(db, "sandbox", sandbox.rpcUrl);
+        expect(autoExtension.errors).toEqual([]);
+        expect(autoExtension.contractsChecked).toBe(1);
+        expect(autoExtension.contractsExtended).toBe(1);
+        expect(autoExtension.entriesExtended).toBeGreaterThanOrEqual(1);
+
+        const postExtensionCycle = await runMonitorCycle(db, "sandbox", sandbox.rpcUrl);
+        expect(postExtensionCycle.errors).toEqual([]);
+        expect(postExtensionCycle.alertsResolved).toBeGreaterThanOrEqual(1);
+
+        const entries = getEntriesForContract(db, deployment.contractId);
+        for (const entry of entries) {
+            expect(entry.live_until_ledger - sandbox.latestLedger).toBeGreaterThanOrEqual(45);
+        }
+
+        const history = getExtensionHistory(db, deployment.contractId);
+        expect(history).toHaveLength(2);
+        expect(history.every((record) => record.new_ttl_ledgers >= 45)).toBe(true);
+
+        const alerts = getAlertHistory(db, deployment.contractId);
+        expect(alerts.length).toBeGreaterThanOrEqual(1);
+        expect(alerts.every((alert) => alert.resolved === 1)).toBe(true);
+    });
+});
\ No newline at end of file