Preflight an x402 endpoint before paying: fetches its 402 unpaid, checks the
Preflight an x402 endpoint before paying: fetches its 402 unpaid, checks the asset is Circle-issued USDC for that network, price sanity, scheme, timeout, and payTo (contract or EOA, USDC balance on Base). Returns ok / caution / block.
1 route settlement-verified · $0.005 USDC/request · 1 endpoint · Finance · base network · x402 protocol
Verified routes
GET /v1/x402-preflight· $0.005 · Verified with a $0.005 test payment on 13 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
- Verify a Base mainnet tx paid native Circle USDC to a recipient: amount,
- Hosted at
zero-payment-guard.worker.beacon.host- Category
- Finance
- Price
- $0.005 USDC per request
- Payment networks
- Base
- Settlement-verified
- 1 route, last checked 2026-11-13
- Listed on PayAPI Market
- 2026-11-13
Try Preflight an x402 endpoint before paying: fetches its 402 unpaid, checks the
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://zero-payment-guard.worker.beacon.host/v1/x402-preflight"About this API
Preflight an x402 endpoint before paying: fetches its 402 unpaid, checks the is listed in the Finance category with pricing at $0.005 USDC/request. One route has been settlement-verified by PayAPI Market on 2026-11-13. 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.
Add this badge to your README
Paste this on your site. The link points at this listing. Listing is free and PayAPI takes 0% of each job.
Markdown
[](https://payapi.market/api/preflight-an-x402-endpoint-before-paying-fetches-its-402-unpaid-checks-the)
HTML
<a href="https://payapi.market/api/preflight-an-x402-endpoint-before-paying-fetches-its-402-unpaid-checks-the"><img src="https://payapi.market/badge/preflight-an-x402-endpoint-before-paying-fetches-its-402-unpaid-checks-the.svg" alt="Settlement-verified on PayAPI Market" height="20"></a>
Questions about this API
What does Preflight an x402 endpoint before paying: fetches its 402 unpaid, checks the do?
Preflight an x402 endpoint before paying: fetches its 402 unpaid, checks the asset is Circle-issued USDC for that network, price sanity, scheme, timeout, and payTo (contract or EOA, USDC balance on Base). Returns ok / caution / block. It is provided by Verify a Base mainnet tx paid native Circle USDC to a recipient: amount,.
How much does Preflight an x402 endpoint before paying: fetches its 402 unpaid, checks the cost?
Preflight an x402 endpoint before paying: fetches its 402 unpaid, checks the is priced at $0.005 USDC per request, paid per call with no subscription. Verified with a $0.005 test payment on 13 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 Preflight an x402 endpoint before paying: fetches its 402 unpaid, checks the?
No. Preflight an x402 endpoint before paying: fetches its 402 unpaid, checks the 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 Preflight an x402 endpoint before paying: fetches its 402 unpaid, checks the 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 2026-11-13.
How does an AI agent find Preflight an x402 endpoint before paying: fetches its 402 unpaid, checks the?
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.
More Finance APIs · Browse the marketplace · List your own API
Related APIs
- ioi · 1 route verified · OpenAI-compatible chat completions for open models, priced per token in USDC on Base via x402.
- COUVERT - FX Hedge Decision · 1 route verified · Hedge now, partially or wait on a Tunisian importer payable, using BCT daily rates.
- Crypto Derivatives Data API · 1 of 10 routes verified · Crypto derivatives data for agents: perp funding rates, funding arbitrage, open interest, basis, implied vol, liquidations, order books across 8 exchanges. $0.003-$0.005 per call via x402 on Base.
- CrowdWisdom Trading - Pro-Trader Crowd Sentiment API · 1 of 5 routes verified · ProCrowdSentimentScore (-100 short to +100 long) for stocks, ETFs, crypto, futures and FX from 21,576+ pro traders on YouTube, X, StockTwits, Reddit, brokers, podcasts and newsletters.
- Financial Data x402 · 1 of 78 routes verified · Pay-per-call financial data for AI agents: stocks, macro, crypto, prediction markets, and on-chain reads on Base, priced in USDC on Base or Solana.
- x402 preflight: check any x402 endpoint BEFORE you pay it · 1 route verified · 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.
More from Verify a Base mainnet tx paid native Circle USDC to a recipient: amount,
- Base transaction status in one call: not_found / pending / success / reverted,
- One-call Base wallet snapshot: ETH and canonical token balances (native USDC,
- Web page to clean Markdown plus metadata: fetch any public URL and return the
- Company brief bundle: everything in domain-enrich (name, socials, email
- Company/domain enrichment from public sources for a domain, URL or work email:
- View all from Verify a Base mainnet tx paid native Circle USDC to a recipient: amount,
By Verify a Base mainnet tx paid native Circle USDC to a recipient: amount,