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Hermes Data API – Forex Rate Lookup
x402
Hermes Data API – Forex Rate Lookup is a paid API for AI agents from x402-api-blond.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Returns the current exchange rate between two currency pairs, sourced from exchangerate-api, for $0.01 USDC per call via x402 protocol.
Price / call$0.01
Success—
StatusUnknown
How this service works
Pay-per-call data API: crypto prices (CoinGecko), China A-share quotes (Sina), weather (Open-Meteo), forex rates, and Ethereum gas fees. Payments via x402 protocol, USDC on Base.
Output
Returns a JSON object containing the source currency (from), target currency (to), the live exchange rate (rate), a Unix timestamp (ts) of when the rate was fetched, and the data source name (e.g. 'exchangerate-api').
Example use cases
Invoice currency conversion for freelancer
“I just sent an invoice in EUR but my client pays in USD — what's the current EUR to USD exchange rate so I can convert the amount accurately?”
Travel budget planning
“I'm heading to Japan next week. What's the live forex rate from USD to JPY so I can figure out how much yen I'll get for $500?”
Crypto-to-fiat reporting
“I need to mark my books in GBP but my revenue is in AUD — can you pull the current AUD to GBP exchange rate for me?”
Technical details
Endpoint
POSThttps://x402-api-blond.vercel.app/forex/rateWhen to prefer
Choose this endpoint when you need a quick, low-cost ($0.01 USDC) spot forex rate lookup for any currency pair via a pay-per-call model with no subscription required. It is especially useful for AI agents operating in crypto-native environments already using the x402 payment protocol on Base, and when you also need sibling data (crypto prices, weather, A-share quotes) from the same Hermes API without managing multiple API keys.
Side effects
- Unsupported or invalid currency codes return an error
- Payment failure via x402 protocol (insufficient USDC balance or incorrect payment header) results in 402 response
- Upstream exchangerate-api outage may cause delayed or unavailable rates
- Malformed request body (missing 'from' or 'to' fields) returns a validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"to": "CNY",
"ts": 1750000000000,
"from": "USD",
"rate": 7.25,
"source": "exchangerate-api"
}
}Tags
x402
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