# FuelTax IFTA Rates API – Quarter Footnotes

> FuelTax IFTA Rates API – Quarter Footnotes 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 footnotes associated with IFTA quarterly fuel tax rate data for a specified quarter, sourced from human-reviewed iftach.org imports.

## Facts

- Endpoint: GET https://api.freestylevault.com/v1/quarters/%7Bquarter%7D/footnotes
- 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-quarter-footnotes-b6b414a3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IZaBWfME3ne9lZ2lBTloW

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-quarter-footnotes-b6b414a3
```

Example prompt: What are the footnotes for the IFTA quarterly tax rate matrix for 2026-Q2? I need them before I file.

## When to prefer this

Use this endpoint when you need footnote annotations or special exceptions attached to IFTA quarterly tax rates — particularly before filing IFTA returns or when enriching fuel tax reference data with qualifications that affect how rates should be interpreted. Prefer this over the main rates endpoint when your workflow specifically requires the explanatory footnotes rather than the numeric rate values themselves.

## Known failure modes

- Invalid or unsupported quarter format returns an error — use format like 2026-Q2
- HTTP 402 returned when payment is not provided — must retry with PAYMENT-SIGNATURE header using x402 protocol
- Quarter not yet published or too far in the future returns empty or error response
- Malformed quarter path parameter causes a 400 or routing error
- No footnotes available for a given quarter returns empty data object

## 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 response containing footnote data and metadata associated with the specified IFTA quarterly tax rate matrix. Footnotes typically include jurisdiction-specific exceptions, rate qualifications, or special conditions noted by IFTA for that quarter. The response follows a standard {data, meta} envelope.

## 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-quarter-footnotes-b6b414a3/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)