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LedgerProof FX Rate Lookup
x402
LedgerProof FX Rate Lookup is a paid API for AI agents from laen-army-cdp.fly.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Returns the current exchange rate between two ISO-4217 currencies, with a cryptographic hash receipt and proof-gated payment settled only after delivery.
Price / call$0.001
Success—
StatusUnknown
How this service works
Proof-gated data services for autonomous agents. Payment is captured only after the deliverable passes a published acceptance rule that can genuinely fail, and every settled call includes a free cryptographic hash receipt that verifies independently.
Output
A JSON object containing the base currency, quote currency, the spot exchange rate, its inverse, the rate date, and the data source (ECB via frankfurter.dev), plus a free cryptographic hash receipt that can be independently verified.
Example use cases
Travel budget currency conversion
“I'm planning a trip to Japan — what's today's exchange rate from USD to JPY so I can figure out how much yen I'll need?”
Cross-border invoice reconciliation
“We're paying a supplier in GBP but our books are in USD — can you get me today's GBP to USD rate from the ECB reference data, with a hash receipt I can attach to the invoice?”
Crypto-adjacent stablecoin peg check
“What's the current EUR to USDC rate? I want to check the EUR peg value and get the inverse rate too.”
Technical details
Endpoint
POSThttps://laen-army-cdp.fly.dev/sol-06-fx-rateWhen to prefer
Choose this endpoint when you need a verifiable, proof-gated FX rate backed by European Central Bank reference data and want a cryptographic hash receipt for auditing or reconciliation — especially in autonomous agent workflows where trustless payment and delivery verification matter.
Side effects
- Invalid or unsupported ISO-4217 currency code returns a validation error
- Network or upstream ECB data unavailability may cause fetch failures
- Rate date may lag real-time by up to one ECB business day
- Payment not captured if acceptance rule fails — no charge on failed delivery
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| base | string | ISO-4217 base currency |
| quote | string | ISO-4217 quote currency |
Output
Schema · Response
{
"type": "json",
"example": {
"base": "USD",
"rate": 0.9213,
"quote": "EUR",
"source": "European Central Bank reference rates via frankfurter.dev",
"inverse": 1.0854,
"rate_date": "2026-08-19"
}
}Tags
x402
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