{"uid":"cap_V1CejMKik9-tIdrx3D8fx","slug":"fathom-macroeconomic-data-api-compare-series-4fe5bef2","name":"Fathom Macroeconomic Data API — Compare Series","description":"Free macroeconomic data API powered by FRED. 816,000+ economic time series. GDP, inflation, unemployment, interest rates, and more.","url":"https://fsthum.vercel.app/api/compare?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","required":["seriesIds"],"properties":{"limit":{"type":"string","description":"Observations per series (default: 10)"},"seriesIds":{"type":"array","description":"Array of 2-5 FRED series IDs to compare"}}},"responseSchema":{"type":"object","required":["source"],"properties":{"source":{"type":"string"},"comparison":{"type":"object"}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.35","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":"$0.35/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.35","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.35","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_qw6MfnjMpAt12XDzTK1vr","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.35","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Compares 2–5 FRED economic time series side-by-side, returning aligned observations for cross-series macroeconomic analysis.","exampleAgentPrompt":"Pull the last 20 observations for FRED series GDP, UNRATE, and CPIAUCSL and show me how they compare side by side.","exampleUseCases":[{"title":"Inflation vs interest rate analysis","prompt":"Compare the last 24 observations for FRED's FEDFUNDS and CPIAUCSL series — I want to see how the Fed's rate moves relate to inflation over time."},{"title":"Recession indicator dashboard","prompt":"Fetch the last 12 data points each for GDP, UNRATE, and T10Y2Y from FRED and compare them so I can see how growth, unemployment, and the yield curve moved together."},{"title":"Housing market macro context","prompt":"Get me the last 15 observations for MORTGAGE30US, CPIAUCSL, and FEDFUNDS from FRED and compare them side by side so I can see how mortgage rates track with inflation and the Fed funds rate."}],"resultDescription":"A JSON object containing a 'source' string (FRED attribution) and a 'comparison' object with aligned time series observations for each requested FRED series ID, enabling direct cross-series temporal comparison.","failureModes":["Invalid or non-existent FRED series ID returns an error or empty data for that series","Requesting fewer than 2 or more than 5 series IDs may be rejected","Non-numeric or malformed limit value may cause default behavior or error","FRED upstream downtime may result in empty or stale comparison data","Payment failure (x402) prevents the call from being processed"],"whenToPreferThis":"Choose this endpoint when you need to compare multiple FRED macroeconomic time series simultaneously in a single call — ideal for correlation analysis, dashboard building, or research that requires aligned observations across indicators like GDP, CPI, unemployment, and interest rates. Prefer this over single-series endpoints when cross-series comparison is the core goal.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-27T06:44:10.709Z","isFirstParty":false,"canonicalSlug":"fathom-macroeconomic-data-api-compare-series-4fe5bef2"}