PayAPI Market is a discovery marketplace for x402 APIs that AI agents can pay per request in USDC on Base.
Why it matters
API Available
overview
PayAPI Market is an API discovery marketplace tool that enables AI agents and developers to find APIs that accept per-request payments in USDC. It focuses on x402 APIs on Base, and its verified badges indicate listings backed by on-chain settlements. Providers can list services without paying a listing fee.
features
PayAPI Market provides a catalog for discovering APIs that accept x402 payments. Its stated verification method is based on actual on-chain settlements.
use cases
PayAPI Market is intended for AI agents and API providers working with per-request USDC payments on Base.
how to use
Visit https://payapi.market/ to discover listed APIs. For a provider listing, consult the marketplace's listing process; provider listings are stated to be free, with a $49-per-month featured option.
pricing
PayAPI Market uses a freemium listing model. Providers can list APIs for free, while the featured listing option costs $49 per month. The stated provider model allows providers to keep 100% of settlements; the marketplace listing prices are separate from API call payments.
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Pricing Page
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PayAPI Market is a Base-focused discovery marketplace that emphasizes verification through on-chain settlements. Other x402 catalogs and gateways may differ in indexing methods, supported networks, provider fees, or whether they operate as directories or access gateways.
Maintained in the Coinbase ecosystem as the primary public catalog for x402 Bazaar services with live on-chain volume and endpoint metrics.
It offers a much wider index of mainstream and enterprise x402 endpoints than PayAPI Market, but discovery is automated via transaction indexing rather than PayAPI's manual on-chain settlement verification test.
An open-source HTTP 402 marketplace supporting multi-chain micropayments across Base, SKALE, and Polygon.
Provides open-source codebases and low gas alternatives like SKALE, but charges API providers a 5% cut on payouts unlike PayAPI Market's 100% take-home model.
Combines an x402 pay-per-call API registry with on-chain ERC-8004 and Solana reputation scores to filter reliable services automatically.
Offers built-in circuit breakers, refunds, and multi-chain support beyond Base, but introduces token gating and facilitator fees compared to PayAPI's straightforward Base-native directory.
A machine-readable 402 challenge gateway and catalog pre-configured for frontier LLMs and prediction market endpoints.
Provides plug-and-play proxy access to LLMs like Claude and GPT with raw Base USDC payments, but functions primarily as a curated gateway rather than an open directory where any provider can self-list.
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