diff --git a/beacon-chain/rpc/eth/config/BUILD.bazel b/beacon-chain/rpc/eth/config/BUILD.bazel
index 5536a3f08a65..82cdbbce4f41 100644
--- a/beacon-chain/rpc/eth/config/BUILD.bazel
+++ b/beacon-chain/rpc/eth/config/BUILD.bazel
@@ -7,6 +7,7 @@ go_library(
     visibility = ["//visibility:public"],
     deps = [
         "//api/server/structs:go_default_library",
+        "//config/fieldparams:go_default_library",
         "//config/params:go_default_library",
         "//monitoring/tracing/trace:go_default_library",
         "//network/httputil:go_default_library",
diff --git a/beacon-chain/rpc/eth/config/handlers.go b/beacon-chain/rpc/eth/config/handlers.go
index 38c29839d24a..9a03f12f7aa9 100644
--- a/beacon-chain/rpc/eth/config/handlers.go
+++ b/beacon-chain/rpc/eth/config/handlers.go
@@ -9,6 +9,7 @@ import (
 	"strings"
 
 	"github.com/OffchainLabs/prysm/v7/api/server/structs"
+	fieldparams "github.com/OffchainLabs/prysm/v7/config/fieldparams"
 	"github.com/OffchainLabs/prysm/v7/config/params"
 	"github.com/OffchainLabs/prysm/v7/monitoring/tracing/trace"
 	"github.com/OffchainLabs/prysm/v7/network/httputil"
@@ -181,6 +182,16 @@ func prepareConfigSpec() (map[string]any, error) {
 		data[tag] = convertValueForJSON(val, tag)
 	}
 
+	// Add Fulu preset values. These are compile-time constants from fieldparams,
+	// not runtime configs, but are required by the /eth/v1/config/spec API.
+	data["NUMBER_OF_COLUMNS"] = convertValueForJSON(reflect.ValueOf(uint64(fieldparams.NumberOfColumns)), "NUMBER_OF_COLUMNS")
+	data["CELLS_PER_EXT_BLOB"] = convertValueForJSON(reflect.ValueOf(uint64(fieldparams.NumberOfColumns)), "CELLS_PER_EXT_BLOB")
+	data["FIELD_ELEMENTS_PER_CELL"] = convertValueForJSON(reflect.ValueOf(uint64(fieldparams.CellsPerBlob)), "FIELD_ELEMENTS_PER_CELL")
+	data["FIELD_ELEMENTS_PER_EXT_BLOB"] = convertValueForJSON(reflect.ValueOf(config.FieldElementsPerBlob*2), "FIELD_ELEMENTS_PER_EXT_BLOB")
+	data["KZG_COMMITMENTS_INCLUSION_PROOF_DEPTH"] = convertValueForJSON(reflect.ValueOf(uint64(4)), "KZG_COMMITMENTS_INCLUSION_PROOF_DEPTH")
+	// UPDATE_TIMEOUT is derived from SLOTS_PER_EPOCH * EPOCHS_PER_SYNC_COMMITTEE_PERIOD
+	data["UPDATE_TIMEOUT"] = convertValueForJSON(reflect.ValueOf(uint64(config.SlotsPerEpoch)*uint64(config.EpochsPerSyncCommitteePeriod)), "UPDATE_TIMEOUT")
+
 	return data, nil
 }
 
diff --git a/beacon-chain/rpc/eth/config/handlers_test.go b/beacon-chain/rpc/eth/config/handlers_test.go
index fcfb9dfda844..0d5703c22a83 100644
--- a/beacon-chain/rpc/eth/config/handlers_test.go
+++ b/beacon-chain/rpc/eth/config/handlers_test.go
@@ -212,7 +212,7 @@ func TestGetSpec(t *testing.T) {
 	require.NoError(t, json.Unmarshal(writer.Body.Bytes(), &resp))
 	data, ok := resp.Data.(map[string]any)
 	require.Equal(t, true, ok)
-	assert.Equal(t, 180, len(data))
+	assert.Equal(t, 186, len(data))
 	for k, v := range data {
 		t.Run(k, func(t *testing.T) {
 			switch k {
@@ -598,6 +598,18 @@ func TestGetSpec(t *testing.T) {
 				blobSchedule, ok := v.([]any)
 				assert.Equal(t, true, ok)
 				assert.Equal(t, 2, len(blobSchedule))
+			case "FIELD_ELEMENTS_PER_CELL":
+				assert.Equal(t, "64", v) // From fieldparams.CellsPerBlob
+			case "FIELD_ELEMENTS_PER_EXT_BLOB":
+				assert.Equal(t, "198", v) // FieldElementsPerBlob (99) * 2
+			case "KZG_COMMITMENTS_INCLUSION_PROOF_DEPTH":
+				assert.Equal(t, "4", v) // Preset value
+			case "CELLS_PER_EXT_BLOB":
+				assert.Equal(t, "128", v) // From fieldparams.NumberOfColumns
+			case "NUMBER_OF_COLUMNS":
+				assert.Equal(t, "128", v) // From fieldparams.NumberOfColumns
+			case "UPDATE_TIMEOUT":
+				assert.Equal(t, "1782", v) // SlotsPerEpoch (27) * EpochsPerSyncCommitteePeriod (66)
 			default:
 				t.Errorf("Incorrect key: %s", k)
 			}
diff --git a/changelog/satushh-fulu-beacon-config.md b/changelog/satushh-fulu-beacon-config.md
new file mode 100644
index 000000000000..5fd8800bed8c
--- /dev/null
+++ b/changelog/satushh-fulu-beacon-config.md
@@ -0,0 +1,3 @@
+### Added
+
+- Added missing beacon config in fulu so that the presets don't go missing in /eth/v1/config/spec beacon api. 
\ No newline at end of file
diff --git a/specrefs/.ethspecify.yml b/specrefs/.ethspecify.yml
index b93e19a915b9..23ff034667d6 100644
--- a/specrefs/.ethspecify.yml
+++ b/specrefs/.ethspecify.yml
@@ -13,10 +13,6 @@ specrefs:
 
 exceptions:
   presets:
-    # Not implemented
-    - CELLS_PER_EXT_BLOB#fulu
-    - UPDATE_TIMEOUT#altair
-
     # Not implemented: gloas (future fork)
     - BUILDER_PENDING_WITHDRAWALS_LIMIT#gloas
     - MAX_PAYLOAD_ATTESTATIONS#gloas
@@ -415,10 +411,8 @@ exceptions:
     - update_proposer_boost_root#phase0
 
   presets:
-    - CELLS_PER_EXT_BLOB#fulu
     - BUILDER_PENDING_WITHDRAWALS_LIMIT#gloas
     - BUILDER_REGISTRY_LIMIT#gloas
     - MAX_BUILDERS_PER_WITHDRAWALS_SWEEP#gloas
     - MAX_PAYLOAD_ATTESTATIONS#gloas
     - PTC_SIZE#gloas
-    - UPDATE_TIMEOUT#altair
diff --git a/specrefs/presets.yml b/specrefs/presets.yml
index 21371d77fdd0..a5d42928d2d5 100644
--- a/specrefs/presets.yml
+++ b/specrefs/presets.yml
@@ -19,7 +19,10 @@
     </spec>
 
 - name: CELLS_PER_EXT_BLOB
-  sources: []
+  sources:
+    - file: beacon-chain/rpc/eth/config/handlers.go
+      search: data\["CELLS_PER_EXT_BLOB"\]
+      regex: true
   spec: |
     <spec preset_var="CELLS_PER_EXT_BLOB" fork="fulu" hash="217075f3">
     CELLS_PER_EXT_BLOB = 128
@@ -685,6 +688,16 @@
     TARGET_COMMITTEE_SIZE: uint64 = 128
     </spec>
 
+- name: UPDATE_TIMEOUT
+  sources:
+    - file: beacon-chain/rpc/eth/config/handlers.go
+      search: data\["UPDATE_TIMEOUT"\]
+      regex: true
+  spec: |
+    <spec preset_var="UPDATE_TIMEOUT" fork="altair" hash="e633d57e">
+    UPDATE_TIMEOUT = 8192
+    </spec>
+
 - name: VALIDATOR_REGISTRY_LIMIT
   sources:
     - file: config/fieldparams/mainnet.go