# APIbase — Universal API Hub for AI Agents # https://apibase.pro > One MCP + REST endpoint to 1385 tools from 400 providers. No signup, no subscription, no API key to start — pay per call in USDC (x402 on Base or MPP on Tempo). Why this endpoint instead of individual providers, and how discover/evaluate/pay/execute actually work: https://apibase.pro/why (Markdown: https://apibase.pro/why.md). Answers for specific needs (flight search, image generation, company research): https://apibase.pro/flight-search-intent, https://apibase.pro/image-generation-intent, https://apibase.pro/company-research-intent. ## Quick Start for Agents - Connect: POST https://apibase.pro/mcp (MCP Streamable HTTP) - Discover tools: call the apibase.discover tool (mcpName apibase.discovery.search) with intent/category/max_price_usd — free ($0), ranked by relevance then quality then price, returns pricing/payment rails/availability/quality per match (ZZ-03-05) - Discover tools (REST, no auth): GET https://apibase.pro/api/v1/discover?intent=&category=&max_price_usd=&limit= - Full catalog: GET https://apibase.pro/api/v1/tools (1385 healthy tools; degraded ones are listed with status; JSON schemas) - OpenAPI spec: GET https://apibase.pro/.well-known/openapi.json ## Progressive Disclosure 1385 tools across 25 categories (TOOL_DEFINITIONS[].category — the single source of truth shared by MCP apibase.discover, the REST ?category= filter, and this file, ZZ-03-01). Call apibase.discover (or GET /api/v1/discover) to find relevant tools: - No args → best/most-relevant matches across the whole catalog - category="finance" → finance tools only - intent="search flights" → aviasales, sabre tools ranked by relevance All tools remain callable via tools/call regardless of discovery. The discover_tools prompt still works (kept for backward compatibility) — it now renders apibase.discover's own JSON. /.well-known/site-facts.json — machine-readable facts the pages are checked against. ## Categories (25) business, crypto, developer, device, education, entertainment, finance, health, infrastructure, jobs, legal, location, logistics, marketing, media, messaging, music, news, podcasts, search, social, space, travel, weather, world ## Payment - Protocol: x402 (HTTP 402 Payment Required) or MPP (Authorization: Payment, or Payment-Authorization: Payment next to a Bearer key) - x402 over MCP: X-Payment header OR params._meta["x402/payment"] (x402 MCP transport v2); the 402 tool result carries the payment requirements in _meta - Dedup window (x402): an identical repeated lookup of a cacheable tool by the same wallet within 2 minutes is answered from cache and not charged; the response carries X-APIbase-Charged: false and the original receipt. Not applied to MPP, balance or shop.* tools - Token: USDC on Base mainnet (x402) or Tempo (MPP) - Prices: $0.0005–$29.99 per call (p90 $0.003) - Details: https://apibase.pro/.well-known/x402-payment.json - Receipts: https://apibase.pro/r/.json, a public immutable receipt for each on-chain billed call - Payment identifier / idempotency: https://apibase.pro/integrator/agent-guide, persist the intent before you send; re-send the same id, never re-sign - Tool manifest: https://apibase.pro/api/v1/tools/manifest, definition_sha256 per tool to detect changed definitions - IMPORTANT: use ONE protocol per request, not both - If using mppx SDK: set polyfill: false to avoid intercepting x402 requests - MPP client: mppx >= 0.6.16 (0.4 clients are not supported); the challenge lists one currency, USDC.e on Tempo mainnet (pathUSD on the testnet) - A replayed MPP credential gets 403 credential_replayed - Integrator (AI payment for merchants, https://apibase.pro/integrator): Integrator: 0% (pilot) fee from the merchant, min $0.05, orders from $1.00; on Tempo inside the transaction, on Base inside the transaction for clients that support fee-split and invoiced otherwise. Merchants connected: 7. ## Agent Integration Guide 1. Match price to wallet — fetch only tools you can afford: GET /api/v1/tools?max_price=0.01 # only tools ≤ $0.01 GET /api/v1/tools?tier=micro # < $0.01 GET /api/v1/tools?tier=standard # $0.01–$0.99 GET /api/v1/tools?tier=premium # $1+ (3 tools) 2. Each tool entry includes: pricing.price_usd — sticker price per call pricing.cache_hit_price_usd — balance tier only; balances are credited by refunds only. Paying via x402/MPP per call is always billed price_usd, cache hit or not. tier — micro | standard | premium min_balance_usd — minimum on-chain USDC the wallet should hold input_schema — JSON Schema for the call's body 3. 402 challenge body always includes price_usd + min_balance_usd, so you can short-circuit signing if your balance is insufficient. 4. Use input_schema to build valid params — avoids 400 schema validation errors. 5. Cache the tool list — it changes only on provider onboards (rare). ## Guides (62) - 2026-11-01 [developer] fabric iq mcp: https://apibase.pro/guides/fabric-iq-mcp - 2026-11-01 [weather] openweather api: https://apibase.pro/guides/openweather-api - 2026-10-31 [developer] mcp full form: https://apibase.pro/guides/mcp-full-form - 2026-10-31 [developer] slm vs llm: https://apibase.pro/guides/slm-vs-llm - 2026-10-30 [developer] blender mcp addon: https://apibase.pro/guides/blender-mcp-addon - 2026-10-30 [developer] roblox studio mcp: https://apibase.pro/guides/roblox-studio-mcp - 2026-10-29 [developer] api website: https://apibase.pro/guides/api-website - 2026-10-29 [developer] openai launches always-on ai agents: https://apibase.pro/guides/openai-launches-always-on-ai-agents - 2026-10-28 [developer] serper api: https://apibase.pro/guides/serper-api - 2026-10-28 [developer] types of ai agents: https://apibase.pro/guides/types-of-ai-agents - 2026-10-27 [developer] desktop commander mcp: https://apibase.pro/guides/desktop-commander-mcp - 2026-10-27 [developer] usdc coin: https://apibase.pro/guides/usdc-coin - 2026-10-26 [developer] api marketplace: https://apibase.pro/guides/api-marketplace - 2026-10-26 [news] api news: https://apibase.pro/guides/api-news - 2026-10-22 [developer] how to create ai agents: https://apibase.pro/guides/how-to-create-ai-agents - 2026-10-22 [developer] viewmax io mcp: https://apibase.pro/guides/viewmax-io-mcp - 2026-10-19 [integrator] accept payments from ai agents: https://apibase.pro/guides/accept-payments-from-ai-agents - 2026-10-19 [integrator] agentic commerce for merchants: https://apibase.pro/guides/agentic-commerce-for-merchants - 2026-10-19 [integrator] agentic payments: https://apibase.pro/guides/agentic-payments - 2026-10-19 [integrator] how does x402 work: https://apibase.pro/guides/how-does-x402-work - ...and 42 more: https://apibase.pro/guides/