{"uid":"cap_ibH6T5XW4MwQz7JAC_ciw","slug":"polyform-vehicle-fuel-economy-lookup-9b9b1cf7","name":"Polyform Vehicle Fuel Economy Lookup","description":"Pay-per-call data endpoints for AI agents. USDC on Base via x402. No account, no API key — one micropayment per call.","url":"https://api.polyform.org/v1/vehicle/fuel-economy","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"matches":[{"id":"36154","trim":"Auto (S6), 4 cyl, 2.4 L","cityMpg":27}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","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":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_a7ehkPyWybeCaU2-Z3pX4","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns fuel economy data (city MPG, trim, engine specs) for a specific vehicle, pay-per-call via USDC micropayment.","exampleAgentPrompt":"What's the city MPG for a 2024 Toyota Camry 2.5L 4-cylinder — look it up and tell me which trim it corresponds to.","exampleUseCases":[{"title":"Used car purchase research","prompt":"I'm thinking of buying a 2019 Honda Accord 1.5T — what's the city fuel economy and which trim does that engine come in?"},{"title":"Fleet vehicle efficiency comparison","prompt":"Can you pull the city MPG for a 2023 Ford Escape 1.5L 4-cylinder so I can compare it against our current fleet vehicles?"},{"title":"Road trip cost estimation","prompt":"What's the city MPG on a 2022 Subaru Outback 2.5L? I want to estimate how much gas I'll spend commuting in it."}],"resultDescription":"Returns a list of matching vehicle trim entries, each containing a unique match ID, a human-readable trim description (including transmission type, cylinder count, and displacement), and the city MPG rating.","failureModes":["No matches found if vehicle make/model/year combination is unrecognized or outside EPA database coverage","Payment failure if USDC balance is insufficient or x402 transaction is rejected","Ambiguous results if query is too broad and multiple trims are returned, requiring further filtering","Rate limiting or network error if x402 facilitator is unreachable"],"whenToPreferThis":"Choose this endpoint when you need authoritative EPA-style city MPG data for a specific vehicle without signing up for an API key or monthly subscription — ideal for AI agents making one-off vehicle lookups with micropayment billing via USDC on Base. Prefer over bulk automotive data APIs when you only need fuel economy for a single vehicle and want zero account overhead.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:46:17.015Z","isFirstParty":false}