# FX Pulse – Stablecoin & Fiat FX Reference Rates

> FX Pulse – Stablecoin & Fiat FX Reference Rates is a paid API for AI agents from fx-pulse-chi.vercel.app, paid per call via x402, $0.015/call, status unknown (last checked 2026-10-16).

Returns real-time FX reference rates between fiat currencies and major stablecoins (USDC, EURC, USDT) for a given base/quote pair or batch of up to 20 targets.

## Facts

- Endpoint: GET https://fx-pulse-chi.vercel.app/api/rates?utm_source=zero.xyz
- Price: $0.015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fx-pulse-stablecoin-fiat-fx-reference-rates-f37804d3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tyY6VoyJ5TwrJoeNRDEHH

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 fx-pulse-stablecoin-fiat-fx-reference-rates-f37804d3
```

Example prompt: What's the current FX Pulse exchange rate for USDC against EUR, GBP, JPY, and VND?

## When to prefer this

Choose this endpoint when you need real-time FX reference rates specifically covering major stablecoins (USDC, EURC, USDT) alongside fiat currencies, and especially when operating in a pay-per-call crypto-native environment using x402 on Base. It is ideal for agents handling stablecoin payments, DeFi workflows, or multi-currency invoicing where stablecoin-to-fiat rates are a first-class requirement.

## Known failure modes

- Unsupported currency code returns an error or omits that pair from the response
- Exceeding 20 quote currencies may result in a validation error
- Payment failure via x402/USDC may block the request entirely
- Network or upstream rate feed outage may return stale or unavailable rates
- Malformed base/quote parameters return a 400-level error

## How this service works

Single-pair rate, amount conversion, and batch FX rates for fiat currencies and major stablecoins (USDC, EURC, USDT...). Pay-per-call in USDC via x402 on Base.

## Output

A JSON object containing the base currency code, the date of the rate snapshot, and a 'rates' map of each requested quote currency code to its numeric exchange rate (e.g. {"base":"USDC","date":"2026-09-19","rates":{"EUR":0.92,"GBP":0.79,"JPY":147.3}}).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "base": {
   "type": "string",
   "description": "Base currency (ISO-4217) or stablecoin ticker."
  },
  "quotes": {
   "type": "array",
   "items": {
    "type": "string"
   },
   "description": "Up to 20 target currency/stablecoin codes."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "base": "USDC",
  "date": "2026-09-19",
  "rates": {
   "EUR": 0.92,
   "GBP": 0.79,
   "JPY": 147.3,
   "VND": 25400
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fx-pulse-stablecoin-fiat-fx-reference-rates-f37804d3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fx-pulse-chi.vercel.app](https://www.zero.xyz/host/fx-pulse-chi.vercel.app/llms.txt)