{"uid":"cap_nwzxYu1LFVf1_s7O9zgOd","slug":"fathom-macroeconomic-data-api-related-series-lookup-301f3098","name":"Fathom Macroeconomic Data API — Related Series Lookup","description":"Free macroeconomic data API powered by FRED. 816,000+ economic time series. GDP, inflation, unemployment, interest rates, and more.","url":"https://fathoms.vercel.app/api/related","method":"POST","headers":{},"bodySchema":{"type":"object","required":["seriesId"],"properties":{"seriesId":{"type":"string","description":"FRED series ID"}}},"responseSchema":{"type":"object","required":["source"],"properties":{"source":{"type":"string"},"series_id":{"type":"string"},"categories":{"type":"array","items":{"type":"object"}}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.04","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","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":"$0.04/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.04","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.04","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_SbZnlV0lyX0NpHowQpmg5","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.04","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns related FRED economic time series and categories for a given FRED series ID","exampleAgentPrompt":"Can you find FRED economic series related to UNRATE (the US unemployment rate) and show me what categories and related indicators come up?","exampleUseCases":[{"title":"Discovering related inflation indicators","prompt":"I'm researching inflation — can you look up what FRED series are related to CPIAUCSL and show me the categories it belongs to?"},{"title":"Exploring related GDP growth series","prompt":"For the GDP series on FRED, can you pull up all the related economic time series and categories so I can find adjacent indicators to build my analysis?"},{"title":"Finding related interest rate data","prompt":"I want to explore data connected to the federal funds rate — can you check what FRED series are related to FEDFUNDS and list the categories it's grouped under?"}],"resultDescription":"Returns a JSON object containing the data source attribution, the queried series ID, and an array of related category objects — each describing a FRED category that the series belongs to or is associated with, enabling discovery of adjacent economic indicators.","failureModes":["Invalid or non-existent FRED series ID returns an error or empty categories array","Missing required seriesId field returns a validation error","FRED upstream outage may cause failed or stale responses","Rate limits or payment failures (x402) will block access","Very obscure or deprecated series IDs may return no related categories"],"whenToPreferThis":"Use this endpoint when you need to discover what economic indicators are related to a known FRED series ID — ideal for exploring the FRED taxonomy, building economic dashboards with related data, or finding adjacent indicators for research. Prefer this over a general FRED series search when you already have a specific series ID and want to understand its categorical context and related series.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:45:23.814Z","isFirstParty":false}