PayAPI Market | UK's API Marketplace for AI Agents - x402 Protocol

Turn your data into a money-making API: the UK's x402 marketplace

Turn your data into a money-making API in 5 minutes.

Got specialist knowledge? Property records, legal precedents, medical codes, logistics data? AI agents need it. They'll pay you per lookup. Automatically.

No code required. We handle payments, hosting, and discovery. You keep 100%.

List your API - free · Explore the marketplace

x402 protocol: backed by Coinbase, Cloudflare. Moved to Linux Foundation.

43 Live APIs · 388 Endpoints · 124,715 UK licensed rental records · 100% Kept by providers

UK property data API, Companies House API, postcode lookup API, pay per request API, x402 marketplace, AI agent API marketplace, MCP API directory, USDC API payments, micropayment API

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

List your API : Add your endpoint URL, set a price per request (from $0.001), write a description. Free, takes 5 minutes.

AI agents discover you : Your API appears in the Model Context Protocol registry. Claude Desktop, Cursor, LangChain agents, and any MCP-compatible client find you automatically.

Agents pay, you keep 100% : Every request triggers an x402 micropayment. USDC settles on Base in under a second. No invoicing, no chasing, no support needed.

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.

Built for these clients

PayAPI Market is built for the agent runtimes our providers' APIs are called from:

Claude Desktop : Anthropic's MCP-native client

Cursor : IDE with native MCP support

Continue : open-source dev assistant

LangChain / LangGraph agents : Python & TypeScript

AutoGen, CrewAI, custom agents : any MCP-compatible client

As seen on

Official MCP Registry : auto-published, indexed

PulseMCP : auto-ingested directory entry

mcp.so : submitted, listed

Smithery : listed

Glama : submitted

x402 ecosystem : community marketplace

Coverage and listings are added as they happen. Reach out at hello@payapi.market with corrections.

Live API listings

43 live APIs, 388 endpoints total across property, companies, weather, vehicles, finance, HMO licensing, waste collection, air quality, text analytics, data intelligence, and more. Selected listings:

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.

Company Enrichment API : 6 endpoints. Companies House lookup plus directors, filings, SIC codes, financials. $0.003–0.005 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. $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...