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code402 Gateway Echo
x402
code402 Gateway Echo is a paid API for AI agents from gateway.code402.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Echoes back a POST request payload over an x402 machine-payable micropayment channel, settling $0.001 USDC directly to the seller wallet.
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-payable APIs over x402 (HTTP 402 + USDC) on the open M2M/1 protocol. Non-custodial: payments settle direct to seller wallets.
Output
The endpoint returns the echoed POST body along with HTTP 200 confirmation after a successful x402 USDC micropayment of $0.001 has been processed and settled non-custodially to the seller wallet.
Example use cases
Integration smoke test for x402 client
“Send a quick echo call through the code402 gateway to confirm my x402 client is correctly attaching the USDC payment header and getting a valid response back — use the body {"test": true}.”
Verifying non-custodial payment settlement
“I want to confirm that a $0.001 USDC micropayment settles directly to the seller wallet with no custodian involved — can you ping the code402 echo endpoint with a small payload and show me the payment receipt?”
Agent-to-agent payment channel validation
“My AI agent needs to prove it can autonomously pay for API calls using x402 — run an echo test through code402 gateway with the payload {"agent": "demo", "step": 1} so I can verify the M2M payment flow works before wiring it into production.”
Technical details
Endpoint
POSThttps://gateway.code402.dev/api/echoWhen to prefer
Choose this endpoint when you need a minimal, low-cost ($0.001 USDC) way to validate that your x402 machine-payable API client is correctly constructed — particularly for testing payment header generation, non-custodial USDC settlement flows, or M2M protocol compliance without invoking a more expensive or side-effectful endpoint.
Side effects
- Insufficient USDC balance — payment rejected with HTTP 402 and payment-required details
- Missing or malformed x402 payment header — request rejected before processing
- Network timeout during payment settlement — uncertain whether payment cleared
- Invalid wallet address configuration — payment cannot route to seller
- Malformed POST body — echo may fail or return error
Tags
x402
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