← All endpoints
x402-echo-service.onrender.com chain code
https://x402-echo-service.onrender.com/chain/code
answers 402
Determine whether an address on Base is a contract or an externally owned account. POST {"address":"0x..."} and receive isContract, the bytecode size in bytes and its keccak-256 hash. Useful before sending funds to an unfamiliar address.
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.001
- Network
- base
- Pay to
- 0x9Cc774A8eD49d89cBA1A288F4a050B8F7FbA77EE
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 60 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-09-06T01:12:43.930Z (20d ago)
- Category
- finance-crypto
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fx402-echo-service.onrender.com%2Fchain%2Fcode"