# FuelTax IFTA Rates API – Quarterly Rate Lookup

> FuelTax IFTA Rates API – Quarterly Rate Lookup is a paid API for AI agents from api.freestylevault.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).

Returns committed IFTA fuel tax rates for a given quarter, jurisdiction, and fuel type, with mid-quarter revisions exposed as separate effective periods.

## Facts

- Endpoint: GET https://api.freestylevault.com/v1/rates
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fueltax-ifta-rates-api-quarterly-rate-lookup-1cc3704c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NJjdelVutu8qeVZotHZXu

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-rate-lookup-1cc3704c
```

Example prompt: Can you look up the committed IFTA diesel tax rate for Washington state for Q2 2026, including any mid-quarter rate revision periods?

## When to prefer this

Choose this endpoint when you need authoritative, human-reviewed IFTA quarterly tax rates keyed by jurisdiction and fuel type, especially when mid-quarter revisions matter for accurate pro-rated IFTA reporting. It is specifically useful for fleet operators, trucking compliance tools, and tax software that must produce correct IFTA filings. Prefer this over scraped or unverified sources when auditability and quarterly accuracy against iftach.org are required.

## Known failure modes

- Unknown or unsupported jurisdiction code returns an empty result or 404
- Invalid quarter format (not YYYY-QN) causes a validation error
- Unsupported fuel type returns no results or an error
- Quarter not yet imported (future quarter) returns no data
- Rate data not yet human-reviewed for the specified quarter may be unavailable

## 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 structured response listing IFTA tax rate entries for the specified quarter, jurisdiction, and fuel type. Each entry includes the effective period (clipped to the quarter), the tax rate, jurisdiction code, and fuel type. Mid-quarter rate revisions appear as separate period entries, enabling precise pro-rated tax calculations.

## Request schema (JSON Schema)

```json
{
 "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": {
      "quarter": {
       "type": "string"
      },
      "fuel_type": {
       "type": "string"
      },
      "jurisdiction": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fueltax-ifta-rates-api-quarterly-rate-lookup-1cc3704c/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)