{"uid":"cap_hu98zuBK9GQVLCR-BAAeC","slug":"freetier-agent-api-free-tier-lookup-516df307","name":"FreeTier Agent API — Free Tier Lookup","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/free-tiers?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"},"category":{"type":"string"}}}}},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"count":1,"results":[{"url":"https://console.groq.com/docs/rate-limits","name":"Groq - Llama models","category":"AI / LLM API","free_tier_details":"Free tier with per-model rate limits"}]}},"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_43C26HoJFv5igUbNscXlM","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 and retrieve free tier details for APIs, AI models, and developer tools by category or keyword","exampleAgentPrompt":"Can you search the FreeTier Agent API for APIs in the 'AI / LLM API' category that offer a free tier, and list their names, free tier details, and documentation URLs?","exampleUseCases":[{"title":"Discover free LLM APIs for a project","prompt":"I'm building a side project and need a free AI/LLM API — can you search for AI model APIs that have a free tier and tell me what limits each one offers?"},{"title":"Find free email validation tools","prompt":"What APIs in the email or validation category have free tiers? Search for anything related to 'email' and show me the details."},{"title":"Budget tool comparison for a startup","prompt":"We're bootstrapping and need to cut costs — can you look up all the free-tier developer APIs available in the 'data' or 'utility' category so we can see what we can use without paying?"}],"resultDescription":"Returns a JSON object with a count of results and an array of matching APIs, each with a name, category, URL to documentation, and a description of their free tier details (e.g. rate limits, request quotas, feature restrictions).","failureModes":["No results returned if query or category does not match any indexed APIs","Empty results array if search term is too specific or misspelled","API may return an error if required 'input' object is malformed or missing","Stale data if the underlying free-tier database has not been recently updated for a given service"],"whenToPreferThis":"Use this endpoint when an agent needs to discover or verify free tier availability, limits, or rate limits for developer APIs — especially AI/LLM APIs — without requiring any signup. Prefer this over general web search when you need structured, cited data about free tiers across thousands of APIs in a single call.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-18T12:54:00.775Z","isFirstParty":false,"canonicalSlug":"freetier-agent-api-free-tier-lookup-516df307"}