{"uid":"cap_gDUGulbv8zsXaVewiNzN_","slug":"fueltax-ifta-rates-api-quarter-changes-fae2e194","name":"FuelTax IFTA Rates API – Quarter Changes","description":"IFTA quarterly tax rate matrix (iftach.org), human-reviewed import each quarter. Reference data. Verify against the official IFTA matrix before filing. Paid endpoints use the x402 payment protocol (base, USDC): expect HTTP 402 with PAYMENT-REQUIRED, retry with PAYMENT-SIGNATURE.","url":"https://api.freestylevault.com/v1/quarters/%7Bquarter%7D/changes","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"data":{},"meta":{}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_tT8vugEDINVmZzmMz7yhT","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the changes in IFTA fuel tax rates for a specific quarter compared to the prior period, sourced from the human-reviewed iftach.org quarterly matrix.","exampleAgentPrompt":"What IFTA fuel tax rate changes happened in 2026-Q2? I need to know which jurisdictions updated their rates so I can verify my quarterly filing.","exampleUseCases":[{"title":"Quarterly IFTA filing preparation","prompt":"Pull the IFTA rate changes for 2026-Q1 so I can see which jurisdictions updated their fuel tax rates before I submit our quarterly return."},{"title":"Fleet compliance rate monitoring","prompt":"Which states or provinces changed their IFTA diesel tax rates in 2025-Q4? I need to update our fleet management system before the filing deadline."},{"title":"Tax software rate delta update","prompt":"Get me the full list of IFTA rate changes for 2026-Q2 so I can patch our trucking tax software with the latest jurisdiction rate deltas."}],"resultDescription":"A JSON object containing a data array of IFTA jurisdiction rate changes for the specified quarter — including jurisdiction codes, fuel types, old and new rates, and effective dates — along with a meta block containing quarter metadata such as source version and review date.","failureModes":["Invalid or unrecognized quarter format returns an error (e.g. quarter not yet available or malformed like '2026Q2' instead of '2026-Q2')","Quarter not yet imported/reviewed by human staff returns 404 or empty data","HTTP 402 PAYMENT-REQUIRED if valid x402 payment signature is not provided","Rate-limit or authentication errors if signature is malformed or expired","No changes for a quarter where all jurisdictions held rates flat — data array may be empty"],"whenToPreferThis":"Use this endpoint when you specifically need to know what changed between quarters in the IFTA tax rate matrix — ideal for differential updates to tax software, compliance audits, or pre-filing verification workflows. Prefer this over the full committed-rates endpoint when you only need the delta, not the full current matrix.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T06:30:35.540Z","isFirstParty":false}