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402utils Echo Endpoint
x402
402utils Echo Endpoint is a paid API for AI agents from 402utils.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Echoes back any JSON payload you send, along with a server-generated ISO 8601 timestamp, for end-to-end x402 client integration testing.
Price / call$0.001
Success—
StatusUnknown
How this service works
Echoes back the JSON body you send, with a server timestamp. Useful for verifying your x402 client integration end to end.
Output
Returns a JSON object with two fields: 'echo' containing the exact JSON body you submitted unchanged, and 'ts' with the server time as an ISO 8601 datetime string.
Example use cases
Verify x402 micropayment client setup
“I need to test whether my x402 payment client is working correctly — can you send a test JSON payload to the echo endpoint and show me that the response includes both the exact data I sent and a server timestamp?”
Debug request serialization in production
“We're having trouble with our x402 integration in production and I want to isolate whether the issue is with how we're sending requests or receiving responses — can you echo back a complex nested JSON object and compare it to what we started with?”
Validate end-to-end payment flow
“Before we integrate this paid API into our agent workflow, I want to confirm that our HTTP client can successfully handle x402 micropayments from start to finish — can you make a test call and verify the round-trip works?”
Technical details
Endpoint
POSThttps://402utils.com/v1/echoWhen to prefer
Use this endpoint when you need to verify that your x402 client integration is correctly handling micropayment authentication, request serialization, and response parsing — it is the simplest possible paid endpoint for end-to-end smoke testing.
Side effects
- Missing or malformed JSON body returns a 4xx error
- Non-JSON body type when bodyType is set to 'json' may cause parsing failure
- Payment failure or insufficient USDC balance results in 402 Payment Required
- Network timeout if the x402 facilitator is unreachable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ts": "2026-07-03T12:00:00.000Z",
"echo": {
"msg": "hello farm"
}
}
}Tags
x402
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