{"uid":"cap_9XjCRVyoFW7FMRh2iJnnT","slug":"x402-geocoder-production-up-railway-app-a4f6ca39","name":"x402 Reverse Geocoder — Lat/Lng to US Census Block","description":"Reverse-geocode a lat/lng coordinate to its enclosing US Census block (state/county/tract/block FIPS codes). Query params: lat (required, decimal degrees), lng (required, decimal degrees). US-only coverage.","url":"https://x402-geocoder-production.up.railway.app/geocode/reverse","method":"POST","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm__6_QGhwXj8QfgqyNjcsDC","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Reverse-geocodes a decimal latitude/longitude coordinate to its enclosing US Census block, returning state, county, tract, and block FIPS codes.","exampleAgentPrompt":"What US Census block, tract, county, and state FIPS codes correspond to the coordinates latitude 38.8977 and longitude -77.0365?","exampleUseCases":[{"title":"Validate delivery addresses for census-based compliance","prompt":"I have a list of GPS coordinates from our last-mile deliveries—can you tell me what US Census blocks they fall into so we can verify we're meeting our geographic coverage requirements?"},{"title":"Append census geography to customer records","prompt":"We collect latitude and longitude when customers sign up. Can you enrich our database by looking up the census tract and county FIPS codes for each of those coordinates?"},{"title":"Route field agents by census district","prompt":"Our field agents are working across multiple census tracts today. Can you take these GPS locations and tell me which census blocks they're currently in so I can organize them by state and county?"}],"resultDescription":"Returns the US Census FIPS codes for the state, county, census tract, and census block that contain the given lat/lng point. Coverage is US-only.","failureModes":["Coordinates outside the US return no result or an error (US-only coverage)","Invalid or missing lat/lng parameters return a 400-level error","Coordinates in US waters or uninhabited areas may not map to a census block","Payment charged per call regardless of whether a result is found"],"whenToPreferThis":"Use this endpoint when you need to identify the precise US Census geographic unit (block/tract/county/state) for a known lat/lng coordinate — for example, to join demographic data, comply with census-based reporting, or resolve a GPS point to an administrative geography. Prefer this over forward geocoding when you already have coordinates and need FIPS codes rather than a street address.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:35:43.287Z","isFirstParty":false}