# FuelTax IFTA Rates API – Quarterly Exchange Rate Lookup

> FuelTax IFTA Rates API – Quarterly Exchange Rate Lookup is a paid API for AI agents from api.freestylevault.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-12).

Returns IFTA quarterly fuel tax rate data (exchange/conversion rates) for a specified quarter, sourced from iftach.org and human-reviewed each quarter.

## Facts

- Endpoint: GET https://api.freestylevault.com/v1/quarters/%7Bquarter%7D/exchange-rate
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fueltax-ifta-rates-api-quarterly-exchange-rate-lookup-88d51d1a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Crdy02cH-TFyU-hDu6qru

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability fueltax-ifta-rates-api-quarterly-exchange-rate-lookup-88d51d1a
```

Example prompt: What are the IFTA fuel tax rates for 2026-Q2? I need the diesel rates for Washington state before I file my quarterly return.

## When to prefer this

Use this endpoint when you need machine-readable IFTA quarterly fuel tax rate data for compliance, reporting, or fleet management automation. It is particularly valuable when you need structured rate data by jurisdiction and fuel type without manually parsing PDFs from iftach.org. Prefer this over manual lookups when automating quarterly IFTA filings or when building trucking compliance workflows. Always cross-verify results against the official IFTA matrix before filing, as stated in the service description.

## Known failure modes

- Quarter not yet published — rates for future or very recent quarters may not be available
- Invalid quarter format — malformed quarter parameter returns an error
- HTTP 402 Payment Required — request must be retried with a valid x402 PAYMENT-SIGNATURE header and USDC payment
- Unknown jurisdiction or fuel type — may return empty data or 404
- Stale data — rates are imported quarterly and may lag slightly behind official publication

## 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 the IFTA tax rate data for the specified quarter, including rate values and metadata. The response includes a `data` object with rate details and a `meta` object with quarter and source information. Rates are human-reviewed imports from iftach.org and should be verified against the official IFTA matrix before filing.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {},
  "meta": {}
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fueltax-ifta-rates-api-quarterly-exchange-rate-lookup-88d51d1a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.freestylevault.com](https://www.zero.xyz/host/api.freestylevault.com/llms.txt)