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AgentResolver — x402 Payment Preflight & PayTo Verification
x402
AgentResolver — x402 Payment Preflight & PayTo Verification is a paid API for AI agents from agentresolver.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).
Verifies an x402 payment endpoint before committing funds, checking the payTo address, USDC quote, network, asset binding, TLS, and endpoint safety.
Price / call$0.001
Success—
StatusUnknown
How this service works
Continuously check whether AI agents can discover, call and pay your API, MCP server or x402 service. Free live checks and GitHub Action monitoring.
Output
Returns a JSON object with a prepaymentDecision field containing a decision string (e.g. 'eligible') and an eligibleForCallerAuthorization boolean, plus details about the payTo address, USDC quote, network, asset, resource binding, and TLS/endpoint safety status.
Example use cases
Safe pre-payment check for AI agent
“Before my agent pays that x402 API, can you verify the endpoint is legitimate — check the payTo wallet, USDC amount, and that TLS and resource binding look clean on Base?”
Validate new x402 vendor before onboarding
“I want to start using a new x402-gated data service — can you do a preflight check on their endpoint to confirm the network is Base, the USDC quote matches what they quoted, and the payTo address is actually live?”
Catch fraudulent x402 payment targets
“I got an x402 endpoint URL from a third party — can you run safety checks on it to make sure the payTo address, TLS, and asset binding are all valid before I authorize any payment?”
Technical details
Endpoint
GEThttps://agentresolver.vercel.app/api/x402-payment-preflight?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to safely verify an x402 payment target before committing USDC, especially when dealing with unknown or third-party x402 endpoints on Base or Solana. Prefer this over blindly paying any x402 402-response to avoid paying fraudulent, misconfigured, or unsafe payment endpoints.
Side effects
- Endpoint URL is unreachable or returns non-x402 response
- payTo address is invalid or not live on the specified network
- TLS certificate is invalid or endpoint fails safety checks
- Network or asset mismatch (e.g. wrong chain or non-USDC asset)
- Resource binding does not match the declared endpoint
- Decision returned as 'ineligible' if checks fail
- HTTP 4xx/5xx if request body is malformed or missing required fields
Output
Schema · Response
{
"type": "json",
"example": {
"prepaymentDecision": {
"decision": "eligible",
"eligibleForCallerAuthorization": true
}
}
}Tags
x402
Reviews
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