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ZenVault X.echo
x402
ZenVault X.echo is a paid API for AI agents from api.zenvault.eu, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).
Echoes a submitted payload back as a created resource with a one-time management token, serving as a test or validation endpoint for the x402 micropayment protocol.
Price / call$0.005
Success—
StatusUnknown
How this service works
ZenVault X.echo
Output
A JSON object containing the created (echoed) resource — mirroring the submitted payload — plus a one-time management token that can be used for subsequent resource management operations.
Example use cases
Validate x402 payment integration
“Can you hit the ZenVault X.echo endpoint with a simple test payload to confirm my x402 USDC payment header is being accepted and I get back a valid resource plus management token?”
Round-trip payload integrity check
“Send this JSON body to the ZenVault echo endpoint and tell me if the response contains the same data back along with a one-time management token — I want to confirm nothing is getting mangled in transit.”
Smoke-test a new x402 API key
“Run a quick smoke test against ZenVault's X.echo endpoint using my new x402 credentials so I can confirm the $0.005 USDC charge goes through and the echo response comes back correctly.”
Technical details
Endpoint
POSThttps://api.zenvault.eu/v1/x402/echo?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to test or validate an x402 micropayment integration specifically on the ZenVault platform, confirm round-trip payload integrity, or obtain a one-time management token as part of a paid API workflow. It is best suited for developer testing, integration smoke-testing, and verifying that x402 payment headers are correctly formed and accepted.
Side effects
- Payment not included or malformed x402 header — results in 402 Payment Required
- Invalid or malformed request body — may return 400 Bad Request
- Management token is one-time use; reusing it will fail
- Service unavailability at api.zenvault.eu returns 5xx errors
- Insufficient USDC balance causes payment failure and request rejection
Tags
x402
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