APIbase is an API hub for AI agents, offering a single MCP and REST endpoint connected to its real-time tool catalog. According to official materials, the catalog contains 1,405 tools from 405 providers, covering areas such as travel (Amadeus, Sabre), Polymarket prediction markets, cryptocurrency, and weather. Users can get started without registration, subscription, or API keys, and fees are paid per call in USDC via the x402 protocol on the Base chain or MPP on Tempo.
The project also offers Integrator: an MCP storefront for merchants. Merchants can get their own MCP storefront, and after the buyer's agent obtains a quote, it pays directly to the merchant's wallet in USDC (x402 on Base, MPP on Tempo). The solution is non-custodial, with a 0% fee during the pilot period. A WooCommerce plugin is also provided on the merchant side for catalog synchronization and webhooks for paid orders.
Regarding connectivity, official materials provide a Claude Desktop configuration and support Cursor, Windsurf, OpenAI Agents SDK, LangChain, Google ADK, CrewAI, Microsoft Copilot Studio, and plain REST. Related discovery files include llms.txt, ai.txt, mcp.json, openapi.json (OpenAPI 3.1 specification), and api-catalog (RFC 9727 discovery link set).
In terms of technical architecture, APIbase is a single Node.js/TypeScript API server, using PostgreSQL as the append-only source of financial truth, Redis only for caching and rate limiting, and a multi-container Docker stack deployed on a single Hetzner server. Every tool call goes through the same multi-stage pipeline (hosting-first, idempotent, fail-closed, content moderation), and uses dual-track payments (self-hosted x402 facilitator and MPP), with an error code contract.
Applicable scenarios include: AI agents needing to call external real-time data or services (travel, prediction markets, cryptocurrency, weather, etc.); merchants wanting to accept payments from AI agents through an MCP storefront. Limitations:Payment depends on USDC and specific chains/protocols; official materials do not provide complete details of the tool list, per-call pricing, availability SLA, etc., and these are not currently available.
