{"uid":"cap_PxZYw9UdC8DXCD1K56rV6","slug":"fathom-macroeconomic-data-api-popular-series-7fa4b854","name":"Fathom Macroeconomic Data API — Popular Series","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/popular","method":"POST","headers":{},"bodySchema":null,"responseSchema":null,"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_6bmvMX3N42rJGJSH9KsNT","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 a curated list of the most popular macroeconomic time series available from the FRED-powered Fathom dataset","exampleAgentPrompt":"Pull up the most popular macroeconomic time series from Fathom's FRED-powered API — I want to see which economic indicators like GDP, inflation, and unemployment are most frequently used so I can decide what to query next.","exampleUseCases":[{"title":"Macro dashboard starting point","prompt":"Give me a list of the most popular macroeconomic indicators available through Fathom — things like GDP, CPI, unemployment rate, and interest rates — so I can build out a dashboard of the key series I should be tracking."},{"title":"Research topic discovery","prompt":"I'm starting a research project on the US economy. Can you fetch the top popular economic time series from Fathom so I know which FRED datasets are most relevant and widely referenced?"},{"title":"Economics education overview","prompt":"I want to teach a quick lesson on macroeconomics — can you pull the most popular economic data series from Fathom so I can show students the most important indicators like inflation, GDP growth, and unemployment?"}],"resultDescription":"A list of the most popular macroeconomic time series available in the Fathom/FRED dataset, likely including series identifiers, names, descriptions, and possibly popularity metrics or metadata for each indicator (e.g. GDP, CPI, unemployment rate, federal funds rate).","failureModes":["Payment not provided or insufficient USDC balance (402 Payment Required)","POST body malformed or unexpected format causing 400 error","Service unavailable due to Vercel cold start or upstream FRED API outage","Empty or truncated response if upstream FRED data source is temporarily unavailable","Rate limiting if called too frequently in a short window"],"whenToPreferThis":"Choose this endpoint when you need a curated starting point for macroeconomic data exploration — specifically when you want to discover which FRED time series are most popular or relevant before making more targeted data queries. Prefer this over direct FRED API access when you want a simplified, pay-per-call interface without managing API keys, or when you need a quick overview of top economic indicators rather than searching across 816,000+ series manually.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:47:03.289Z","isFirstParty":false}