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FX Pulse – Stablecoin & Fiat FX Reference Rate (Single Pair)
x402
FX Pulse – Stablecoin & Fiat FX Reference Rate (Single Pair) is a paid API for AI agents from fx-pulse-chi.vercel.app, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-20).
Returns the current exchange rate between a source fiat currency or stablecoin and a target fiat currency or stablecoin.
Price / call$0.003
Success—
StatusUnknown
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
Returns a JSON object containing the source currency ('from'), target currency ('to'), the exchange rate as a decimal number ('rate'), and the date of the rate ('date'). Example: {"from":"USDC","to":"EUR","rate":0.92,"date":"2026-09-19"}.
Example use cases
Invoice pricing in local currency
“What's the current USDC to EUR exchange rate right now? I need to issue an invoice to a European client and want to quote them the right euro amount.”
Stablecoin portfolio valuation
“Can you look up the current rates for USDT to GBP and EURC to JPY so I can calculate the local-currency value of my stablecoin holdings?”
Cross-border payment sanity check
“Before I send a payment, can you check what the current USDC to BRL rate is so I know how many reais my counterparty will effectively receive?”
Technical details
Endpoint
GEThttps://fx-pulse-chi.vercel.app/api/rate?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a real-time or near-real-time reference exchange rate between fiat currencies and/or major stablecoins (USDC, EURC, USDT) and want a pay-per-call pricing model with no subscription commitment. It is particularly well-suited for AI agents that need to price stablecoin transactions, invoice amounts, or cross-border payments on demand.
Side effects
- Unsupported currency ticker — returns an error if 'from' or 'to' is not a recognized ISO-4217 code or supported stablecoin ticker
- Missing required parameters — omitting 'from' or 'to' will likely return a 400-level error
- Payment failure — if the x402 USDC micropayment on Base is not processed correctly, the request will be rejected
- Rate unavailability — if the underlying FX data source is temporarily unavailable, the endpoint may return a 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | Target currency (ISO-4217) or stablecoin ticker. |
| from | string | Source currency (ISO-4217) or stablecoin ticker (USDC, USDT, EURC...). |
Output
Schema · Response
{
"type": "json",
"example": {
"to": "EUR",
"date": "2026-09-19",
"from": "USDC",
"rate": 0.92
}
}Tags
x402
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