x402 preflight: check any x402 endpoint BEFORE you pay it
x402 preflight: check any x402 endpoint BEFORE you pay it. Probes the target unpaid and returns its live price in USD, network, whether the asset is canonical USDC, payTo, timeout, mismatches vs the CDP Bazaar listing, and a pay / caution / do_not_pay verdict. Never signs or pays anything.
1 route settlement-verified · $0.01 USDC/request · 1 endpoint · Finance · base network · x402 protocol
Verified routes
GET /api/preflight· $0.01 · Verified with a $0.01 test payment on 7 Nov 2026 · receipt
Other routes are unverified.
Networks: Base (settlement-verified)
Discovery is free. Agents search the catalogue here. Payment happens on the listing 402, not on PayAPI.
url https://payapi.market/mcpListing facts
- Provider
- x402 preflight: check any x402 endpoint BEFORE you pay it
- Hosted at
x402-preflight-grokbot.netlify.app- Category
- Finance
- Price
- $0.01 USDC per request
- Payment networks
- Base
- Settlement-verified
- 1 route, last checked 2026-11-07
- Listed on PayAPI Market
- 2026-11-06
Try x402 preflight: check any x402 endpoint BEFORE you pay it
Call a verified route without paying first. The server should answer HTTP 402 Payment Required with the price, the USDC asset, the network and the wallet to pay. An x402 client pays that amount on Base and retries with the payment header.
curl -i "https://x402-preflight-grokbot.netlify.app/api/preflight?url=https://example.com"About this API
x402 preflight: check any x402 endpoint BEFORE you pay it is listed in the Finance category with pricing at $0.01 USDC/request. One route has been settlement-verified by PayAPI Market on 2026-11-07. View receipt on Basescan.
Payments settle on base in USDC via the x402 protocol. AI agents discover this API through the PayAPI Market MCP server and pay per request without API keys or accounts.
This API exposes 1 endpoint.
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<a href="https://payapi.market/api/x402-preflight-check-any-x402-endpoint-before-you-pay-it"><img src="https://payapi.market/badge/x402-preflight-check-any-x402-endpoint-before-you-pay-it.svg" alt="Settlement-verified on PayAPI Market" height="20"></a>
Questions about this API
What does x402 preflight: check any x402 endpoint BEFORE you pay it do?
x402 preflight: check any x402 endpoint BEFORE you pay it. Probes the target unpaid and returns its live price in USD, network, whether the asset is canonical USDC, payTo, timeout, mismatches vs the CDP Bazaar listing, and a pay / caution / do_not_pay verdict. Never signs or pays anything. It is provided by x402 preflight: check any x402 endpoint BEFORE you pay it.
How much does x402 preflight: check any x402 endpoint BEFORE you pay it cost?
x402 preflight: check any x402 endpoint BEFORE you pay it is priced at $0.01 USDC per request, paid per call with no subscription. Verified with a $0.01 test payment on 7 Nov 2026. The exact amount for each call is in the HTTP 402 response before any money moves.
Do I need an API key or account to use x402 preflight: check any x402 endpoint BEFORE you pay it?
No. x402 preflight: check any x402 endpoint BEFORE you pay it uses the x402 protocol, so an agent pays per request in USDC on Base and gets the response, with no API key, account or signup.
Has x402 preflight: check any x402 endpoint BEFORE you pay it been verified?
Yes, 1 route. PayAPI Market paid for a real call from its own wallet, received real data back and recorded the USDC settlement on-chain, most recently on 2026-11-07.
How does an AI agent find x402 preflight: check any x402 endpoint BEFORE you pay it?
Through the free PayAPI Market MCP server at https://payapi.market/mcp, using search_apis or get_api, or over plain HTTP at https://payapi.market/agent/search. Discovery is free; the agent pays the provider directly on the listing's own 402.
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