{"service":"bridge-condition-screen","description":"Pay-per-call bridge condition screening for AI agents (x402). POST /screen with a structure number, state+county, or location text; pay $0.05 in USDC on Base per call.","payment":{"protocol":"x402 v2","network":"eip155:8453","price_per_call":"$0.05","mode":"mainnet"},"data_source":"FHWA National Bridge Inventory 2025 (USDOT BTS/NTAD) - US federal public domain","endpoints":{"POST /screen":"{structure_number: string, state?: string} OR {state: string, county: string} OR {query: string, state?: string}","GET /coverage":"index coverage + condition distribution","GET /openapi.json":"OpenAPI 3.1 document","GET /.well-known/x402":"x402 resource manifest"},"disclaimer":"Informational only, not legal or engineering advice. Source: FHWA National Bridge Inventory (NBI), 2025 delimited files, distributed via the USDOT Bureau of Transportation Statistics (NTAD). NBI data is a US federal work product (17 U.S.C. §105), available for unrestricted reuse. Condition verdict uses the standard FHWA rule: the lowest of the deck, superstructure, and substructure ratings (culvert rating for culvert structures) — 7-9 Good, 5-6 Fair, 0-4 Poor. Ratings are 0-9 (9 = excellent, 0 = failed) from the most recent inspection on file; inspection dates lag real-world conditions and a rating is an inventory snapshot, not a live safety determination. FHWA retired the sufficiency rating from the current NBI; the official bridge condition category is returned alongside the computed verdict. Structure numbers are unique within a state only. Verify critical information against official FHWA/state DOT sources before acting."}