{"uid":"cap_bJn3qn7uVWMvJFc8L0EYG","slug":"fathom-macroeconomic-data-api-vintage-dates-617082b2","name":"Fathom Macroeconomic Data API — Vintage Dates","description":"Free macroeconomic data API powered by FRED. 816,000+ economic time series. GDP, inflation, unemployment, interest rates, and more.","url":"https://fredthom.vercel.app/api/vintage","method":"POST","headers":{},"bodySchema":{"type":"object","required":["seriesId"],"properties":{"limit":{"type":"string","description":"Max results (default: 10)"},"seriesId":{"type":"string","description":"FRED series ID"}}},"responseSchema":{"type":"object","required":["source"],"properties":{"source":{"type":"string"},"series_id":{"type":"string"},"vintage_dates":{"type":"array","items":{"type":"object"}}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.4","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":"$0.4/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.4","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.4","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_VCQNze9Vh3CCtuQ1Ye7t7","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.4","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Retrieves vintage dates for a FRED economic time series, showing when historical data revisions were published","exampleAgentPrompt":"Using the Fathom FRED-powered API, fetch the vintage dates for the GDP series (series ID: GDP) and return up to 20 results so I can see when historical revisions were published.","exampleUseCases":null,"resultDescription":"Returns an object containing the source identifier, the FRED series ID, and an array of vintage date objects representing the dates on which data revisions for that series were released","failureModes":["Invalid or unknown FRED series ID returns an error or empty vintage_dates array","Missing required seriesId parameter causes a 400-level validation error","Network or Vercel hosting timeout on large series with many vintages","Limit parameter ignored or misformatted may return default 10 results silently"],"whenToPreferThis":"Use this endpoint when you need to know the specific dates on which a FRED economic time series was revised or updated — i.e., vintage dates — rather than the actual data values themselves. Ideal for researchers doing real-time data analysis, backtesting economic models with point-in-time data, or auditing when macroeconomic indicators were revised.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:37:27.404Z","isFirstParty":false}