{"uid":"cap_A4GREQSmeRaSmTJq2-uGN","slug":"freetier-agent-api-mcp-server-api-directory-search-1cddbc9f","name":"FreeTier Agent API — MCP Server & API Directory Search","description":"Pay-per-call data API for AI agents: AI model prices and cost calculator, 4,259 MCP servers, email domain checks, text-to-JSON extraction, country/holiday/currency lookup, page and link checks, page-to-markdown, 2,230 verified APIs. x402, USDC on Base, no signup. Sources cited in every response.","url":"https://freetier-agent-api.pages.dev/api/agent-tools?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["q"],"properties":{"q":{"type":"string"},"type":{"enum":["mcp","x402"],"type":"string"},"limit":{"type":"string"}}}}},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"total":1,"results":[{"url":"https://github.com/example/pdf-mcp","name":"example/pdf-mcp","type":"mcp","category":"Document processing"}],"sources":[]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_jIqYhn68NrwH94hQwHPnA","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Search a directory of 4,259 MCP servers and 2,230 verified APIs with pay-per-call pricing via x402/USDC on Base","exampleAgentPrompt":"Search the FreeTier Agent API directory for MCP servers related to PDF processing and return the top 5 results.","exampleUseCases":[{"title":"Discover MCP servers for document tasks","prompt":"Find me MCP servers that handle document processing or PDF conversion — show me the top 10 results from the MCP directory."},{"title":"Find x402 pay-per-call APIs for agents","prompt":"I need to find verified x402 APIs for AI agents that don't require a signup — search for APIs related to email domain validation and show me what's available."},{"title":"Explore AI agent tool ecosystem","prompt":"Search for MCP servers related to web scraping or page-to-markdown conversion — I want to see what tools are available in the directory for my agent pipeline."}],"resultDescription":"Returns a JSON object with a total count of matching results and an array of entries, each containing the URL, name, type (mcp or x402), and category of the matching server or API, plus a sources array citing where data came from.","failureModes":["Missing required 'q' query parameter returns an error","Invalid 'type' enum value (not 'mcp' or 'x402') causes a validation error","No matching results returns total:0 with an empty results array","Payment failure via x402/USDC blocks access to the endpoint","Rate limiting or quota exhaustion may return a 402 or 429 response"],"whenToPreferThis":"Choose this endpoint when an AI agent needs to discover MCP servers or verified x402 APIs by category or keyword, especially when no-signup pay-per-call access is required. Prefer this over manual API registries when you need cited sources and structured results for agent toolchain assembly.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-18T12:46:03.682Z","isFirstParty":false,"canonicalSlug":"freetier-agent-api-mcp-server-api-directory-search-1cddbc9f"}