diff --git a/compiled/gasleft.wasm b/compiled/gasleft.wasm
new file mode 100644
index 0000000..5cc274f
Binary files /dev/null and b/compiled/gasleft.wasm differ
diff --git a/src/gasleft.rs b/src/gasleft.rs
new file mode 100644
index 0000000..361ba73
--- /dev/null
+++ b/src/gasleft.rs
@@ -0,0 +1,21 @@
+#![no_std]
+
+extern crate pwasm_std;
+extern crate pwasm_ethereum;
+extern crate bigint;
+
+use pwasm_std::{Vec, write_u64};
+use pwasm_ethereum::{self as ext};
+
+fn push_u64(buf: &mut Vec<u8>, val: u64) {
+	let mut slc = [0u8; 8];
+	write_u64(&mut slc, val);
+	buf.extend(&slc[..]);
+}
+
+#[no_mangle]
+pub fn call() {
+	let mut output: Vec<u8> = Vec::with_capacity(8);
+	push_u64(&mut output, ext::gas_left());
+	ext::ret(&output);
+}