{"uid":"cap_FfNYphtQDgAFnb96-F05L","slug":"freetier-agent-api-verified-apis-search-913ee119","name":"FreeTier Agent API — Verified APIs 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/apis/search?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":[],"properties":{"q":{"type":"string","description":"free-text search in name/description/category"},"auth":{"type":"string","description":"'none' = no API key"},"kind":{"enum":["public_api","dev_free_tier","ai_api_free_tier"],"type":"string"},"alive":{"enum":["yes","no"],"type":"string"},"https":{"enum":["yes"],"type":"string"},"limit":{"type":"string","description":"1-50, default 10"},"category":{"type":"string"}}}}},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"count":1,"results":[{"url":"https://open-meteo.com/","auth":"None","name":"Open-Meteo","alive":"yes","https":"Yes","category":"Weather","checked_at":"2026-10-17T19:51Z","http_status":200}]}},"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_qxQUw3YKJjcxfiykL3d0-","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 curated database of 2,230+ verified public APIs by keyword, category, auth type, liveness, and HTTPS support","exampleAgentPrompt":"Search the FreeTier Agent API catalog for public weather APIs that require no API key, are confirmed alive, and use HTTPS — show me up to 10 results.","exampleUseCases":[{"title":"Finding no-auth public APIs by category","prompt":"Search for verified public APIs in the 'Finance' category that don't require any API key and are confirmed alive — give me up to 10 results."},{"title":"Discovering AI APIs with free tiers","prompt":"Can you search the FreeTier API catalog for AI APIs with free tiers, filtering to only ones that are alive and use HTTPS? Return up to 20 results."},{"title":"Finding alternatives to a paid API","prompt":"I need to find verified public APIs for geolocation or maps that require no auth — search the FreeTier catalog and show me everything available, up to 50 results."}],"resultDescription":"Returns a JSON object with a count of matching results and an array of API records, each containing the API name, URL, auth requirements, liveness status (yes/no), HTTPS support, category, last-checked timestamp, and HTTP status code from the most recent liveness probe.","failureModes":["No results returned when query terms don't match any API name, description, or category in the database","Invalid enum values for 'kind', 'alive', or 'https' parameters cause schema validation errors","Limit parameter out of range (must be 1-50) may be rejected or clamped","Payment not accepted if USDC/x402 transaction fails, resulting in 402 response","Stale liveness data if the 'checked_at' timestamp is old and the API has since gone offline"],"whenToPreferThis":"Choose this endpoint when you need to discover or filter verified, curated public APIs by keyword, category, or auth requirements — especially when you want to confirm liveness and HTTPS status. Prefer this over general web search when you need structured, machine-readable API metadata with verified availability signals. It is particularly useful for agents that need to programmatically select an API provider at runtime based on constraints like 'no auth required' or 'finance category'.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-18T12:45:17.734Z","isFirstParty":false,"canonicalSlug":"freetier-agent-api-verified-apis-search-913ee119"}