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The Stall — Forex Historical Rates
x402
The Stall — Forex Historical Rates is a paid API for AI agents from the-stall.intuitek.ai, paid per call via x402, $0.059/call, status unknown (last checked 2026-09-13).
Returns historical and current foreign exchange rates from ECB data, with optional time-series ranges and point-in-time currency conversion, paid via USDC on Base mainnet.
Price / call$0.059
Success—
StatusUnknown
How this service works
Historical ECB exchange rates — single date lookup or time-series range. Returns rates for up to 30 major currencies (EUR, GBP, JPY, CAD, CHF, CNY, AUD, KRW, etc.) from 1999-01-04 to present. Free, no key, sourced from Frankfurter/ECB. Use for: tax-date FX rates, historical expense reconciliation, multi-year trend analysis, point-in-time currency conversion. Weekends and holidays return the nearest prior business day. Complements forex-rates (real-time) with retrospective data.
Output
Returns a JSON object containing exchange rates for the requested currencies relative to the base currency (default USD) on the specified date. For time-series requests, rates are keyed by date. Optionally includes a converted amount when conversion parameters are provided. Data sourced from ECB, available from 1999-01-04 onward.
Example use cases
Example prompt
“What was the exchange rate from USD to EUR, GBP, and JPY on 2023-03-15 according to ECB data? Also convert 1000 USD to EUR at that date's rate.”
Technical details
Endpoint
GEThttps://the-stall.intuitek.ai/cap/forex-historicalWhen to prefer
Use this endpoint when you need ECB-sourced historical or current forex rates for up to 30 currencies, especially when you need point-in-time currency conversion or multi-date time-series data. Prefer this over live-ticker APIs when accuracy against ECB reference rates matters (e.g. accounting, reporting, financial analysis). No API key required — just pay $0.005 USDC per call via x402 on Base mainnet.
Side effects
- Date before 1999-01-04 — historical data not available, likely returns an error or empty result
- Weekend or ECB holiday date — ECB does not publish rates on non-business days, may return null or nearest prior date
- Invalid ISO 4217 currency symbol — unrecognized currency codes return an error or are omitted
- Date range exceeding 365 days — may return partial results or an error
- Missing required 'date' parameter — returns a 400-level validation error
- Payment failure or insufficient USDC balance — returns HTTP 402
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"base": "USD",
"date": "2023-03-15",
"symbols": [
"EUR",
"GBP",
"JPY"
]
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| required | string | |
| properties | string |
Output
{
"ts": "2026-06-12T05:10:43.203Z",
"base": "USD",
"date": "2023-03-15",
"mode": "single",
"note": null,
"rates": {
"EUR": 0.94796,
"GBP": 0.82703,
"JPY": 132.25
},
"conversion": null,
"rate_count": 3,
"series_days": null
}Tags
x402
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