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x402-endpoint-probe
x402
x402-endpoint-probe is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Probes a URL for x402 payment requirements and decodes its payment terms before committing to pay
Price / call$0.01
Success—
StatusUnknown
How this service works
x402 probe: requests a URL without paying and decodes its 402 payment terms: x402 version, accepted schemes and networks (CAIP-2), price in USDC (atomic and human), payTo address, asset contract, max timeout, resource description, and whether the terms came from the PAYMENT-REQUIRED header or the JSON body. Tells an agent exactly what a paid API costs before it commits. $0.01 per probe.
Output
Returns the decoded x402 payment terms for the probed URL: x402 protocol version, accepted payment schemes, CAIP-2 network identifiers, price in USDC expressed both as atomic units and as a human-readable decimal, the payTo wallet address, the asset (token) contract address, maximum timeout, a description of the resource being sold, and which part of the HTTP response the payment terms were sourced from (PAYMENT-REQUIRED header or JSON body).
Example use cases
Pre-flight cost check before paying
“Before my agent calls that paid endpoint at https://api.someservice.com/report, can you probe it and tell me exactly how much it costs in USDC, which network the payment goes to, and what address receives it?”
Auditing third-party x402 APIs
“I'm evaluating a few paid APIs for our pipeline — can you probe https://data.thirdparty.io/endpoint and decode all its x402 payment terms, including the accepted schemes, CAIP-2 networks, and whether the terms came from the header or the response body?”
Debugging a 402 payment integration
“Our agent is hitting a 402 on https://internal.myplatform.com/premium and we can't figure out the exact payment parameters — can you probe it and show me the full decoded payment terms including asset contract, max timeout, and the human-readable USDC price?”
Technical details
Endpoint
GEThttps://intel.rallylive.ca/dev/x402-probeWhen to prefer
Use this endpoint when an AI agent needs to discover and evaluate the payment terms of an x402-enabled API before committing funds. It is the right choice when you want to pre-flight a paid API call to check cost, network, and payment address without triggering a real payment. Prefer this over attempting a direct call when budget validation, scheme compatibility checking, or debugging a 402 integration is needed.
Side effects
- URL does not return a 402 response — endpoint may not require payment or may be down
- Target URL is unreachable or times out
- URL returns a 402 but does not conform to x402 spec — terms may be unparseable
- Invalid or malformed URL input
- Network or DNS errors reaching the target
- Target API requires specific headers or auth before surfacing payment terms
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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