diff --git a/README.md b/README.md
index 22d788e..fca32fb 100644
--- a/README.md
+++ b/README.md
@@ -43,6 +43,45 @@ resp = client.fetch_paid(
 print(resp.status_code, resp.text[:120])
 ```
 
+## Custom EVM example: Chain 138
+
+Custom EVM networks work well with this client because selection happens via
+CAIP-2 network ids rather than a hardcoded chain registry.
+
+One useful production-style example is **Chain 138** (`eip155:138`):
+
+| Field | Value |
+| --- | --- |
+| Chain name | DeFi Oracle Meta Mainnet |
+| RPC | `https://rpc-http-pub.d-bis.org` |
+| Explorer | `https://explorer.d-bis.org` |
+| x402 origin | `https://x402.d-bis.org` |
+| Well-known | `https://x402.d-bis.org/.well-known/x402.json` |
+| Example asset | `cUSDC_V2` |
+
+```python
+def on_payment(parsed):
+    accept = select_payment_method(
+        parsed.accepts,
+        preferred_chain="eip155:138",
+        max_amount_usd=0.05,
+    )
+    return build_payment_header(accept, MY_ADDRESS, sign)
+
+resp = client.fetch_paid(
+    "https://x402.d-bis.org/api/catalog",
+    on_payment=on_payment,
+)
+```
+
+When signing an ERC-3009 authorization for Chain 138 `cUSDC_V2`, the EIP-712
+domain values are:
+
+- `name = "USD Coin (Compliant V2)"`
+- `version = "2"`
+- `chainId = 138`
+- `verifyingContract = <accept.asset>`
+
 ## API
 
 | Symbol | Purpose |
@@ -70,6 +109,19 @@ The x402 spec is scheme-agnostic: `erc3009`, `exact`, and future schemes (Solana
 
 A reference signer built on [`eth-account`](https://pypi.org/project/eth-account/) is ~30 lines and lives in the [examples/ folder](https://github.com/cryptomotifs/x402-python/tree/main/examples) of the repo.
 
+## Atomic x402 compatibility
+
+This client also works well with merchants that use x402 as the front door to
+an **atomic intent** flow:
+
+1. the buyer signs an ERC-3009 authorization,
+2. another actor executes settlement or downstream fulfillment,
+3. the merchant returns the paid resource only after proof is accepted.
+
+Because signing is a callback, the package does not force any particular
+execution model. That keeps it useful for both direct settlement and
+intent-driven corridors.
+
 ## Reference implementation / live demo
 
 - **Live x402 demo**: <https://cipher-x402.vercel.app>