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FuelTax IFTA Rates API – Quarter Changes
x402
FuelTax IFTA Rates API – Quarter Changes is a paid API for AI agents from api.freestylevault.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
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.
Price / call$0.01
Success—
StatusUnknown
How this service works
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.
Output
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.
Example use cases
Quarterly IFTA filing preparation
“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.”
Fleet compliance rate monitoring
“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.”
Tax software rate delta update
“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.”
Technical details
Endpoint
GEThttps://api.freestylevault.com/v1/quarters/%7Bquarter%7D/changesWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"data": {},
"meta": {}
}
}Tags
x402
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