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SignalHarness FX Rate History
x402
SignalHarness FX Rate History is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Returns historical foreign exchange rate data points for a EUR-based currency pair over a specified date range.
Price / call$0.01
Success—
StatusUnknown
How this service works
Explore 330 pay-per-call x402 API services and 27 agent-native digital products, with Base USDC pricing, secure Polar checkout, and free discovery.
Output
Returns a JSON object containing an array of historical FX rate data points for the requested EUR-based currency pair, including the symbol (e.g. EUR/USD), start and end dates, point count, source metadata (provider name, dataset, attribution notice, source URL, and retrieval timestamp), any warnings, and a payment receipt with execution details.
Example use cases
Forex trend analysis for trading bot
“Get me the EUR/GBP daily exchange rates from October 1 2024 to December 31 2024, limit to 92 data points, so I can analyze the quarterly trend.”
Currency exposure report for finance team
“Fetch historical EUR/JPY rates between July 1 2025 and July 31 2025 with up to 31 data points — I need it for our monthly currency exposure report.”
Backtesting historical FX data
“Retrieve EUR/CHF exchange rate history from January 1 2023 to December 31 2023, up to 256 points, for backtesting a hedging strategy.”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/fx_rate_history/invokeWhen to prefer
Choose this endpoint when you need historical EUR-denominated forex rate series with source attribution and you want pay-per-call micropayment pricing via x402 USDC. Best when you need structured time-series data with provenance metadata (provider, dataset, attribution URL) rather than just raw rates. Preferred over generic FX APIs when operating in an agent-native, blockchain-settled payment context on Base.
Side effects
- Invalid quote currency code (non-3-letter uppercase) returns validation error
- Unsupported base currency (only EUR is currently accepted)
- Date range yields no data points (empty points array with count 0)
- Start date after end date causes empty or error response
- Limit out of range (below 1 or above 256) causes schema validation failure
- Payment failure results in non-execution of the request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| base | string | |
| limit | integer | |
| quote | string | |
| endDate | string | |
| startDate | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"base": "USD",
"count": 0,
"quote": "USD",
"points": [
{
"date": "2026-09-12",
"rate": 1e-8,
"status": "succeeded"
}
],
"source": {
"notice": "example",
"dataset": "example",
"provider": "example",
"sourceUrl": "https://example.com/resource",
"attribution": "example",
"retrievedAt": "example0000000000000",
"freeAccessUrl": "https://example.com/resource"
},
"symbol": "EUR/USD",
"endDate": "2026-09-12",
"warnings": [
"Verify the caller-supplied data before relying on this result."
],
"startDate": "2026-09-12",
"retrievedAt": "example0000000000000"
},
"status": "succeeded",
"receipt": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"usage": [],
"status": "succeeded",
"network": "eip155:8453",
"artifacts": [],
"endedAtMs": 0,
"latencyMs": 0,
"paymentId": "example-payment",
"receiptId": "example-receipt",
"requestId": "example-request",
"serviceId": "fx_rate_history",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "10000",
"resultSha256": "3244b59004ec3966ac05949c44104ff4242b825c31f9d7114e178d241a6628d0",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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