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GateCheck by LarryBuildsAI – x402 Preflight Receipt Check
x402
GateCheck by LarryBuildsAI – x402 Preflight Receipt Check is a paid API for AI agents from x402-resource-scanner.vercel.app, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).
Runs preflight seller-readiness checks and unpaid x402 paid-path probes on an agent tool before marketplace listing, returning a structured receipt of gate results.
Price / call$0.05
Success—
StatusUnknown
How this service works
Preflight checks for paid agent tools: GateCheck seller-readiness checks, unpaid x402 paid-path probes, and launch-pack artifacts before marketplace listing.
Output
Returns a structured receipt containing seller-readiness check results, x402 paid-path probe outcomes (unpaid probes only), and launch-pack artifacts indicating whether the tool is ready for marketplace listing, including any blocking issues or warnings.
Example use cases
Preflight check before marketplace submission
“Before I submit my new paid tool to the agent marketplace, can you run a GateCheck on https://api.mytool.dev/v1/summarize and tell me if there are any blocking issues or warnings I need to fix first?”
Validate x402 paid path configuration
“I just set up x402 micropayment protection on my endpoint at https://tools.builderco.io/v2/analyze — can you probe it with GateCheck to confirm the paid path is configured correctly and I'll get a proper receipt back?”
Audit agent tool launch readiness
“I'm about to go live with my x402-protected agent tool at https://agentapi.launchpad.xyz/v1/classify — run a full GateCheck audit on it and show me the seller-readiness results and any launch-pack artifacts so I know it's good to go.”
Technical details
Endpoint
POSThttps://x402-resource-scanner.vercel.app/v1/receipts/checkWhen to prefer
Use this endpoint when you are a developer or agent builder who needs to validate that a paid x402 agent tool endpoint is correctly configured and seller-ready before submitting it to an agent marketplace. It is specifically designed for the x402 micropayment ecosystem and produces structured receipts with launch-pack artifacts, making it the right choice over generic HTTP probers or uptime checkers.
Side effects
- Target URL is unreachable or returns non-x402 response — probe fails with connection or format error
- Tool endpoint is not x402-compliant — returns gate failure with specific misconfiguration details
- Invalid or missing target URL in request body — returns 400 bad request
- Endpoint times out during probe — returns timeout error in receipt
- x402 payment header misconfigured on target — probe reports payment-path failure
Tags
x402
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