x402 marketplace for AI agents

List an API once. Keep 100% of what each call earns. Agents pay per request in USDC on Base. Listing is free. Live now: 287 APIs, 3,844 endpoints, 207 providers, 271 settlement-verified.

The badge means we put a coin in from our own wallet and the can came out.

271 settlement-verified · providers keep 100% · pay per request in USDC. Powered by the x402 payment standard: agents pay per call, providers get paid automatically.

Browse verified APIs · List your API (free)

Discovery is free. Agents search the catalogue here. Payment happens on the listing 402, not on PayAPI.

url https://payapi.market/mcp

What is an x402 marketplace · RapidAPI alternative for AI agents

287 Live APIs · 271 settlement-verified · 3844 Endpoints · 100% Kept by providers

x402 verified

We paid for it from our own buyer wallet and received product back. The badge is enforced at database level: it cannot be set without a matching settlement record. 271 listings carry it, of which 9 are our own first-party APIs.

Listed

The provider submitted it and it responds to a challenge. We have not paid for it yet.

The story

An agent does not want to buy the warehouse. It wants one can. Grants search. A company check. A charger map. Pay, get the item, move on.

Directories still sell the whole machine: sign up, get a key, wait. PayAPI is the plugged-in slot. Someone lists a button. We drop a real USDC coin on Base. If the can comes out, the row goes on the floor. If the machine is a tunnel, the coil is empty, or the coin bounces, it stays in the back.

Providers keep 100% of the coin. We are not the machine. We are the warehouse that already tested the slot.

List one durable path at https://payapi.market/list.
Agents start at https://payapi.market/mcp.

x402 marketplace where AI agents pay per API call in USDC. Listing is free. Providers keep 100%. Browse or list at payapi.market.

Why PayAPI vs enterprise data providers

Enterprise data providers charge $15,000 per year with annual contracts. PayAPI Market charges $0.002 per request with no commitment. That is 7,500,000 requests before you break even on the enterprise plan. AI agents cannot fill out forms, enter credit cards, or sign contracts. They need x402.

USDC on Base: sub-second settlement, less than $0.001 transaction fee. Zero support tickets needed.

How it works

1. Agent finds an API on payapi.market.
2. Pays the listed price in USDC, no key, no signup.
3. Gets the data, and the provider is paid automatically.

Who is this for

You do not need to be a developer. You need domain expertise. Mortgage brokers, recruiters, accountants, estate agents, solicitors, logistics managers, compliance officers, insurance underwriters, pharmacists, and quantity surveyors can all monetise their specialist knowledge through APIs on PayAPI Market.

Live API listings

287 live APIs, 3844 endpoints total across property, companies, weather, vehicles, finance, HMO licensing, waste collection, air quality, text analytics, data intelligence, and more.

Browse all APIs — view the full marketplace →

Pricing

Listing is free. No per-request fee, providers keep 100% of what the call earns. No subscriptions for buyers. Agents pay per request.

• List your API - free
• Explore the marketplace
• Estimate your revenue
• See pricing

List your API. Keep 100%.

Free to list. No per-request fee from us. We verify with a real payment before the badge goes on. Your API is discoverable by every Claude Desktop, Cursor and custom agent connected to the marketplace.

Submit your API

Full catalogue

A selection of the 287 live APIs on PayAPI Market. See all in the marketplace →

• UK Data API: 24 endpoints. UK government and public data: Land Registry, EPC, Companies House, DVLA, BoE rates, weather, crime, flood risk. $0.001–0.002 per request.
• Email Verification API: 4 endpoints. SMTP check, disposable-domain filter, catch-all detection, role-account heuristics. $0.001 per request.
• Postcode & Address Lookup: 5 endpoints. UK postcode to address, validation, autocomplete, geocoding. $0.001 per request.
• Currency & Crypto API: 5 endpoints. FX rates, crypto spot prices, historical series, conversion. $0.001 per request.
• Screenshot & PDF Capture: 4 endpoints. Headless browser page rendering, full-page screenshots, PDF export. $0.002 per request.
• DNS & Domain Intelligence: 5 endpoints. WHOIS, DNS A/AAAA/MX/TXT, SPF/DKIM, nameserver history. $0.002 per request.
• Web Scraper & Content Extractor: 4 endpoints. HTML to structured data, readability extraction, metadata. $0.002 per request.
• IP Geolocation API: 4 endpoints. IP to country, city, ASN, ISP, timezone. $0.001 per request.
• QR Code API: 4 endpoints. QR generation, decoding, styling, batch. $0.001 per request.
• UK HMO Licence API: 3 endpoints. HMO licence check by address or postcode, full licence details. 124,715 licensed rental records across 65 UK councils, as of May 2026. $0.020–0.040 per request.
• TensorFeed: 60 endpoints. Real-time AI ecosystem data: AI news, model pricing, live service status, MCP registry, AI papers, GPU pricing. $0.020–0.060 per request.
• Official US Business Registry Evidence API: 1 endpoints. Official-source US Secretary of State business-registry evidence for KYB, merchant underwriting, and compliance review across 17 active states. $0.010 per request.
• x402 Agent-Payment Infrastructure: 12 endpoints. x402/MCP layer for paid AI/data calls, crypto conversion quotes, progress streams, receipts, and agent spend governance. $0.001–5.000 per request.
• Merchant Risk WHOIS Domain Evidence API: 1 endpoints. WHOIS and domain-age evidence for merchant underwriting, vendor due diligence, and website legitimacy checks. $0.010 per request.
• IRS 990 Nonprofit Charity Grant Evidence API: 1 endpoints. IRS 990 nonprofit search for charity verification, donor research, grant prospecting, and foundation diligence. $0.010 per request.
• Building Permits Roof Age Solar AHJ Evidence API: 1 endpoints. Official-source building-permit search for contractor leads plus roof-age, property-insurance permit history, solar/AHJ coverage QA, P&C underwriting, COPE permit evidence, and permit source-drift checks. Parameters: city, query/keyword, maxResults. Safe default if city/query are omitted: Austin roof permits with an explicit warning. Deterministic test: city=austin&query=roof&maxResults=5 returns recent permit-event records; city=austin&query=solar&maxResults=5 demonstrates solar/AHJ project evidence.. $0.010 per request.
• SEC EDGAR Filings Public Company Evidence API: 1 endpoints. SEC EDGAR company and filing lookup for investor due diligence, financial research, and 10-K/10-Q discovery. $0.010 per request.
• M2M Trust Lean Six Sigma API: 6 endpoints. Deterministic Lean Six Sigma tools: SPC audit, process capability, Pareto analysis, descriptive stats, and data quality audit. $0.001 per request.
• UK Air Quality API: 1 endpoints. Current UK air quality from DEFRA UK-AIR by postcode, with pollutant readings from nearest monitoring stations. $0.001 per request.
• Text Metrics API: 5 endpoints. Deterministic text analysis for agents: word counts, readability scores, word frequency, style warnings, and aggregate reports. $0.001 per request.
• UK Waste Collection API: 5 endpoints. UK council waste collection schedules by postcode, address, or UPRN across participating councils. $0.001 per request.
• IRONCLAW BTC Node: 24 endpoints. Bitcoin blockchain data from a real full node: fees, mempool, transactions, address portfolio, tx tracing, whale alerts, SEC insider trades, web scraping, AI summarization.. $0.001–0.010 per request.
• Anchor-x402: 16 endpoints. Multi-chain x402 services: OFAC sanctions screening, dual-chain hash anchoring, signed RNG, due-diligence investigator, and LLM utilities. Settles on Base USDC, Solana USDC, or Polygon JPYC. $0.001–$1.77 per request.. $0.001–1.770 per request.
• StockWaves: 14 endpoints. China & global market data for AI agents — real-time Chinese internet pulse (Weibo/Baidu/Douyin), structured China market news & events, industrial-theme momentum, quant signals across A-share/HK/US equities, BTC directional signal, crypto microstructure, and tactical ETF allocation. Plus stateless portfolio optimizer. x402 USDC on Base or Solana, no API key.. $0.030–0.500 per request.
• OSS2API Multi-skill Agent API: 4 endpoints. Open-source AI and web-automation tools as x402-paid agent endpoints: image background removal, URL content analysis, Playwright browser extraction & screenshots, and multi-phase web security scan.. $0.010 per request.
• AgentBodega Agent Tools: 52 endpoints. x402-paid agent utility APIs for public data, social lookup, status checks, cloud health, domain readiness, x402 inspection, artifacts, and launch-readiness audits. $0.001–0.060 per request.

Frequently asked questions

What is an x402 marketplace?

An x402 marketplace is a catalogue of APIs that accept x402 payments, so an AI agent can find a service and pay for each call in USDC without an account or API key. PayAPI Market is one. Discovery is free, and the agent pays the provider directly on the listing's own HTTP 402.

What is PayAPI Market?

PayAPI Market is a pay-per-call API marketplace for AI agents, built on x402. Providers list an API for free and keep 100% of what each call earns. Agents search the catalogue for free, then pay each provider per request in USDC on Base, with no API key, account or subscription.

What is the x402 protocol?

x402 is an open payment protocol built on HTTP 402 Payment Required. When an agent calls a paid endpoint without paying, the server replies 402 with the price, token, network and wallet. The agent signs a USDC payment, retries the request and gets the response. No account, API key or OAuth flow is needed.

How much does PayAPI Market cost?

Listing is free and there is no per-request fee, so providers keep 100% of what each call earns. Searching the catalogue is free for agents too. Buyers pay only the provider's own per-call price in USDC, shown on the listing and in the 402 challenge before any money moves. There are no subscriptions.

How do AI agents discover APIs on PayAPI Market?

Agents connect to one MCP server at https://payapi.market/mcp, which has three free tools: search_apis, list_apis and get_api. Plain HTTP works too, at /agent/search, /agent/list and /agent/get. Discovery never charges and never returns a 402. The agent then calls the provider's own endpoint and pays its HTTP 402 directly.

What does settlement-verified mean?

It means PayAPI Market paid a real call on that listing from its own wallet, got real product back, and there is an on-chain USDC receipt on Base that anyone can check. It is not a health ping. The badge is per listing, from one paid route. Listed APIs answer a valid 402 but have not been paid for yet.

How is PayAPI Market different from RapidAPI?

RapidAPI is built for human developers: you sign up, get an API key and buy plans, and RapidAPI's own docs state a 25% marketplace fee on payments through its hub. PayAPI Market is built for AI agents. There is no key or account, agents pay per call in USDC on Base, and providers keep 100%.

How is PayAPI Market different from Coinbase Bazaar or x402scan?

Coinbase's x402 Bazaar is a catalogue of x402 services discovered through the CDP Facilitator, and x402scan is an independent explorer that indexes x402 endpoints and payments. PayAPI Market is a curated marketplace where a verified badge means we paid for a real call and got real product back, with an on-chain receipt on Base.

What APIs are available on PayAPI Market?

PayAPI Market lists APIs across property, weather, companies, vehicles, finance, HMO licensing, waste collection, air quality, text analytics and more. Every listing is billed per request in USDC, and settlement-verified listings carry an on-chain receipt. Browse the full catalogue at payapi.market/marketplace, or search it free over MCP.