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AgentFeeds Echo Test Endpoint
x402
AgentFeeds Echo Test Endpoint is a paid API for AI agents from api.agentfeeds.jp, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Echoes a query string message back — an x402 payment integration test endpoint for developers validating paid API calls.
Price / call$0.001
Success—
StatusUnknown
How this service works
x402 payment E2E test endpoint (echoes query). Factual data only; not investment advice.
Output
The endpoint returns the echoed text message that was sent as the 'msg' query parameter, confirming that the x402 payment was processed and the API call succeeded.
Example use cases
Example prompt
“Echo the message 'hello x402 test' through the AgentFeeds paid echo endpoint so I can confirm my x402 USDC micropayment integration is working end-to-end.”
Technical details
Endpoint
GEThttps://api.agentfeeds.jp/v1/sample/echoWhen to prefer
Use this endpoint when you need to verify that your x402 micropayment integration is correctly set up — it is the simplest possible paid API call (just an echo) and is purpose-built for E2E testing of payment flows. Not useful for production data retrieval.
Side effects
- Missing 'msg' query param — endpoint may return empty or default response
- Payment failure — x402 handshake fails if USDC balance is insufficient (402 Payment Required)
- Message exceeds 200 characters — may be rejected or truncated
- Network timeout — endpoint unreachable
- Invalid x402 payment header — authentication/payment step fails
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"data": {
"echo": "hello"
},
"kind": "factual_data",
"product": "sample.echo"
}
}Tags
x402
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