x4PayAPI Market

x402 roundup: 26 Oct to 1 Nov 2026

Since 2026-10-26 we paid to verify 20 new APIs on PayAPI Market. Here are five of them, and what each verification actually proved.

What "verified" means here

We do not take a provider's word for it. For every API on this list we sent a real payment in USDC on Base, from our own wallet, and checked that the response contained genuine data.

Each check uses an input the provider did not advertise, so a canned example response cannot pass. Where the underlying data is public, we compare the paid response against the original source field by field.

The APIs

Web page contents from Exa: page text, highlights or a summary from up to 10

Web page contents from Exa: page text, highlights or a summary from up to 10 URLs. Call it when an agent already has URLs and needs their content, with no API key or account.

  • Provider: LLM chat completions API, OpenAI-compatible: one endpoint for 100+ models
  • Price: $0.002 per request
  • Verified route: POST /v1/exa/contents (https://x402.org, text)
  • Settlement: 0x523fe9eb57b7… on Base

Web search API from Exa: up to 25 results with optional page contents

Web search API from Exa: up to 25 results with optional page contents. Call it when an agent needs current web results, with no API key or account.

  • Provider: LLM chat completions API, OpenAI-compatible: one endpoint for 100+ models
  • Price: $0.008 per request
  • Verified route: POST /v1/exa/search (x402 payment facilitators, 5 results)
  • Settlement: 0x5f0fcaa52b11… on Base

Live x402 seller health check: fetches /

Live x402 seller health check: fetches /.well-known/x402(.json) and the unpaid 402 challenge; reports reachable, TLS, schema OK, network, asset, payTo, price, latency. SSRF-safe, no chain reads.

  • Provider: Beggar Bot
  • Price: $0.02 per request
  • Verified route: GET /v1/seller-health?endpoint=https://beggar-bot-demand.beggarbot.workers.dev/v1/risk
  • Settlement: 0x3fad1ed44548… on Base

Exit liquidity check for an open Base token position: simulates selling your

Exit liquidity check for an open Base token position: simulates selling your position (USD size or raw token amount) on the deepest pool and returns net received, price impact / slippage, the largest.

  • Provider: ves georgiev99
  • Price: $0.02 per request
  • Verified route: POST /v1/guard/exit (token 0x4ed4..efed, position_usd 2500)
  • Settlement: 0xbc19ea86915e… on Base

Web answers with citations from Exa: a cited answer to a question

Web answers with citations from Exa: a cited answer to a question. Call it when an agent needs a sourced answer rather than raw search results, with no API key or account.

  • Provider: LLM chat completions API, OpenAI-compatible: one endpoint for 100+ models
  • Price: $0.006 per request
  • Verified route: POST /v1/exa/answer (What is x402?)
  • Settlement: 0x78363ca1965c… on Base

How an agent finds these

Every verified API is queryable as JSON. An agent does not need to read this post, or the website, to find them.

curl "https://payapi.market/agent/list"
curl "https://payapi.market/agent/search?q=property"

Those endpoints return only live listings, and by default only ones we have paid to verify.

The current catalogue

PayAPI Market lists 2451 live APIs, of which 1255 are settlement-verified, across 5 categories: Data, Finance, Intelligence, Tools, Verification.

By · Published 2026-11-04 · Last updated November 4, 2026 · 3 min read