x4PayAPI Market

Settled x402 Preflight

Check any x402 endpoint before your agent pays. One call returns pay / caution / avoid, from live probes, real USDC test purchases, on-chain payers and OFAC screening. 56k endpoints, signed answers.

1 of 8 routes settlement-verified · $0.002–$0.05 USDC/request · 8 endpoints / 18 tools · Verification · base network · x402 protocol

Verified routes

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/mcp

Listing facts

Provider
Settled
Hosted at
settled.tools
Category
Verification
Price
$0.002 to $0.05 USDC per request
Endpoints
8
MCP tools
18
Payment networks
Base
Settlement-verified
1 route, last checked 2026-11-06
Listed on PayAPI Market
2026-10-08

Try Settled x402 Preflight

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://settled.tools/v1/preflight?url=https://x402.ottoai.services/whois-lookup"

About this API

Settled x402 Preflight is listed in the Verification category with pricing at $0.002–$0.05 USDC/request. One route has been settlement-verified by PayAPI Market on 2026-11-06. 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 8 endpoints. Only the verified route has been tested by PayAPI Market. Other routes are unverified.

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Settlement-verified on PayAPI Market

Markdown

[![Settlement-verified on PayAPI Market](https://payapi.market/badge/settled-x402-preflight.svg)](https://payapi.market/api/settled-x402-preflight)

HTML

<a href="https://payapi.market/api/settled-x402-preflight"><img src="https://payapi.market/badge/settled-x402-preflight.svg" alt="Settlement-verified on PayAPI Market" height="20"></a>

What this badge means

Questions about this API

What does Settled x402 Preflight do?

Check any x402 endpoint before your agent pays. One call returns pay / caution / avoid, from live probes, real USDC test purchases, on-chain payers and OFAC screening. 56k endpoints, signed answers. It is provided by Settled.

How much does Settled x402 Preflight cost?

Settled x402 Preflight is priced at $0.002 to $0.05 USDC per request, paid per call with no subscription. Verified with a $0.005 test payment on 6 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 Settled x402 Preflight?

No. Settled x402 Preflight 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 Settled x402 Preflight been verified?

Yes, 1 route of its 8 endpoints. 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 2026-11-06. Routes that were not paid for are unverified.

How does an AI agent find Settled x402 Preflight?

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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