{"uid":"cap_dd_SS2PFUbexKzk0uE2DT","slug":"federal-register-search-api-x402-5abda7ee","name":"Federal Register Search API (x402)","description":"66 pay-per-call APIs: AI text/image generation ($0.01), Polymarket odds, crypto prices, DeFi yields, FX rates, weather, IP/geo, FBI wanted, SEC tickers, clinical trials, 250M academic papers, Stack Overflow, meme-coin launchpads (pump.fun, Clanker, Four.meme, SunPump), tokenized stocks, Solana top 100, and 40+ more. $0.005/call standard. USDC on Base and Solana via x402.","url":"https://workspace-x402-paywall.onrender.com/gov/federal-register?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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","properties":{"limit":{"type":"string","description":"Integer 1-20, number of results to return (default 5)"}}}},"additionalProperties":false}}},"responseSchema":{"type":"object"},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_-ZzhSNhaFbHKcpQ8oRJkY","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns recent Federal Register documents and notices via a pay-per-call endpoint accepting USDC micropayments on Base or Solana.","exampleAgentPrompt":"Can you search the Federal Register for the 5 most recent entries and return just the title and publication date fields?","exampleUseCases":[{"title":"Compliance research for new regulations","prompt":"Find the 10 most recent Federal Register entries and return the agency name, document title, and effective date so I can check for new compliance requirements."},{"title":"Tracking agency rulemaking activity","prompt":"Search the Federal Register for recent entries and give me back just the title and type fields — I want to see what rules or proposed rules have been published lately."},{"title":"Legal research on federal notices","prompt":"Pull the latest 5 Federal Register documents and include the docket number and summary fields — I'm researching public notices from federal agencies for a legal brief."}],"resultDescription":"A JSON object containing a list of Federal Register documents matching the query, with fields such as title, agency name, publication date, document type, docket number, and summary, filtered to the requested fields and limited to the specified count.","failureModes":["Payment not provided or insufficient USDC — returns HTTP 402 with payment instructions","Invalid field names in the fields parameter — may return empty or malformed field values","Limit parameter out of range — may default or return an error","Federal Register API upstream unavailable — returns 502 or empty result set","Network timeout on Render hosting — returns 504"],"whenToPreferThis":"Choose this endpoint when you need quick, pay-as-you-go access to Federal Register data without a long-term API subscription, especially in agentic workflows that require regulatory lookup as a single step. Prefer it over direct Federal Register API integration when you want micropayment billing via USDC on Base or Solana and don't want to manage API keys.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T18:43:27.547Z","isFirstParty":false,"canonicalSlug":"federal-register-search-api-x402-5abda7ee"}