{"uid":"cap_W0Xhy4MnfSliMjlMQFdu6","slug":"mercury402-fred-series-data-api-1fe84126","name":"Mercury402 FRED Series Data API","description":"76 live pay-per-call financial data APIs for AI agents. Treasury, FRED, forex, spreads, breakeven inflation, macro bundles, and composite dashboards. USDC on Base.","url":"https://mercury402.uk/v1/fred/%7Bseries_id%7D","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"date":{"type":"string","description":"Single date observation (YYYY-MM-DD)"},"limit":{"type":"integer","description":"Max observations to return"},"observation_end":{"type":"string","description":"End date for range query (YYYY-MM-DD)"},"observation_start":{"type":"string","description":"Start date for range query (YYYY-MM-DD)"}}},"responseSchema":{"type":"json","example":{"series_id":"UNRATE","observations":[{"date":"2024-01-01","value":"3.7"}],"realtime_end":"2026-03-11","realtime_start":"2026-03-11"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","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":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_jk9bdcKxmmeB88WuQcvQ9","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches historical and current Federal Reserve Economic Data (FRED) observations for a given series ID, with optional date filtering","exampleAgentPrompt":"Pull the FRED unemployment rate series (UNRATE) from January 2020 through December 2024, returning up to 60 observations, so I can see how joblessness trended over that period.","exampleUseCases":null,"resultDescription":"A JSON object containing the requested FRED series ID, a list of date-value observation pairs covering the requested range, and the realtime start/end window used for the query.","failureModes":["Invalid or unknown series_id returns an error or empty observations array","Malformed date strings (not YYYY-MM-DD) may cause a 400 bad request","Date range with no available data returns empty observations","Payment failure (insufficient USDC) results in HTTP 402 before data is returned","observation_start after observation_end returns no results or an error"],"whenToPreferThis":"Choose this endpoint when you need programmatic, pay-per-call access to any FRED economic time series (unemployment, CPI, GDP, M2, etc.) with flexible date range filtering, especially in an autonomous agent context that pays via USDC on Base using the x402 protocol. Prefer over scraping FRED directly or using a general-purpose data API when you need clean JSON output with per-call pricing and no subscription overhead.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T06:30:34.522Z","isFirstParty":false}