diff --git a/.github/workflows/contracts-ci.yml b/.github/workflows/contracts-ci.yml
index 5b9d75d..59a0b49 100644
--- a/.github/workflows/contracts-ci.yml
+++ b/.github/workflows/contracts-ci.yml
@@ -110,6 +110,27 @@ jobs:
           stellar contract build --manifest-path contracts/oracle-adapter/Cargo.toml
           stellar contract build --manifest-path contracts/vault/Cargo.toml
 
+      - name: Check WASM size budgets
+        run: |
+          node -e '
+            const fs = require("fs");
+            const path = require("path");
+            const budgets = JSON.parse(fs.readFileSync("contracts/size-budget.json", "utf8"));
+            let failed = false;
+            for (const [name, budget] of Object.entries(budgets)) {
+              const file = path.join("target/wasm32v1-none/release", `${name}.wasm`);
+              if (fs.existsSync(file)) {
+                const size = fs.statSync(file).size;
+                console.log(`[SIZE] ${name}: ${size} bytes (budget: ${budget} bytes)`);
+                if (size > budget) {
+                  console.error(`[ERROR] ${name} exceeds budget (${size} > ${budget})`);
+                  failed = true;
+                }
+              }
+            }
+            if (failed) process.exit(1);
+          '
+
       # Published with the artifacts, so the hash of a deployed contract's wasm
       # can be checked against the commit that built it.
       - name: Record wasm checksums
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7053e87..c59d3d6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- `ci`: Add `contracts/size-budget.json` establishing tracked byte thresholds for each contract, enforced in `.github/workflows/contracts-ci.yml` (#94).
 - `ci`: Add `deny.toml` and `cargo-deny` check in `.github/workflows/security.yml` to enforce license compliance (Apache-2.0, MIT, BSD) and deny unknown registries (#91).
 - Stage 1 developer-experience tooling:
   - `.gitattributes` normalizing all tracked text to LF (`*.sh`, `*.rs`, `*.ts`, `*.md`, and the other text formats in the tree) and marking `Cargo.lock` and `package-lock.json` as generated. The tree was re-normalized once, and a new **Line Endings** workflow fails any pull request that reintroduces CRLF into the index (#85).
diff --git a/contracts/size-budget.json b/contracts/size-budget.json
new file mode 100644
index 0000000..13ba851
--- /dev/null
+++ b/contracts/size-budget.json
@@ -0,0 +1,7 @@
+{
+  "rwa_asset": 65536,
+  "registry": 65536,
+  "compliance": 65536,
+  "governance": 65536,
+  "oracle_adapter": 65536
+}