# SignalHarness FX Rate — EUR Currency Exchange Rate Lookup

> SignalHarness FX Rate — EUR Currency Exchange Rate Lookup is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Returns the current foreign exchange rate for EUR against a specified quote currency, with sourcing and attribution metadata.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/fx_rate/invoke
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signalharness-fx-rate-eur-currency-exchange-rate-lookup-c9d9a591
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VvMv9aC9VPVHch7kJCXyu

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability signalharness-fx-rate-eur-currency-exchange-rate-lookup-c9d9a591 -d '<json body>'
```

Example prompt: What's the current EUR to USD exchange rate? I need the live rate with source information so I can do a currency conversion.

## When to prefer this

Choose this endpoint when you need a current EUR-based exchange rate with verifiable source attribution and a programmatic payment trail via x402/USDC micropayments. It is ideal for agent workflows requiring auditable FX data with provenance metadata (source URL, provider, dataset) rather than a raw rate alone. The base currency is fixed to EUR, so it is best suited for EUR-centric conversion tasks.

## Known failure modes

- Invalid quote currency code (not a 3-letter uppercase ISO code) returns a validation error
- Unsupported or exotic quote currency may return no rate or a warning
- Payment failure or insufficient USDC balance results in 402 Payment Required
- Rate data unavailable for a currency pair returns an error or empty result
- Network timeout or upstream provider outage causes a failed status in receipt

## 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 with the exchange rate (as a decimal), the currency pair symbol (e.g. EUR/USD), the as-of date, the retrieval timestamp, and a source block containing the data provider name, dataset, notice, source URL, free-access URL, and attribution string. Also includes a warnings array and a signed payment receipt confirming the $0.005 USDC charge.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "base": {
   "enum": [
    "EUR"
   ],
   "type": "string",
   "maxLength": 3,
   "minLength": 3
  },
  "quote": {
   "type": "string",
   "pattern": "^[A-Z]{3}$",
   "maxLength": 3,
   "minLength": 3
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "asOf": "2026-09-12",
   "base": "USD",
   "rate": 1e-8,
   "quote": "USD",
   "source": {
    "notice": "example",
    "dataset": "example",
    "provider": "example",
    "sourceUrl": "https://example.com/resource",
    "attribution": "example",
    "retrievedAt": "example0000000000000",
    "freeAccessUrl": "https://example.com/resource"
   },
   "symbol": "EUR/USD",
   "warnings": [
    "Verify the caller-supplied data before relying on this result."
   ],
   "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",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "5000",
   "resultSha256": "25e3fc8841d599b8bec2cbd505aef3d65fa838ca00b1dd57d377ca9d323ec348",
   "serviceVersion": "1.0.0",
   "settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
  },
  "artifacts": [],
  "requestId": "example-request",
  "executionId": "example-execution"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signalharness-fx-rate-eur-currency-exchange-rate-lookup-c9d9a591/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from signalharness.ai](https://www.zero.xyz/host/signalharness.ai/llms.txt)