Use this service when you need this capability: lists bounded daily ECB EUR foreign-exchange reference-rate pairs, not real-time quotes. ECB source data is free; the price covers SignalHarness normalization and delivery. Every result includes source attribution and freshness warnings.
0.005 USDC per call
x402 V2 exact payment on Base mainnet (eip155:8453) using USDC. The HTTP 402 challenge confirms the exact requirements before an authorized payment.
POST https://signalharness.ai/api/agent/services/fx_pair_list/invokeLists bounded daily ECB EUR foreign-exchange reference-rate pairs, not real-time quotes. ECB source data is free; the price covers SignalHarness normalization and delivery. Every result includes source attribution and freshness warnings.
Daily ECB reference data, not real-time quotes. ECB source data is free; the service price covers normalization and delivery. Check the observation date, attribution, and freshness warnings in each result.
| Field | Type | Required | Limits |
|---|---|---|---|
| query | string | Optional | Minimum length 0; Maximum length 32 |
| limit | integer | Optional | Minimum 1; Maximum 256 |
{
"limit": 50
}{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"additionalProperties": false,
"minProperties": 0,
"maxProperties": 2,
"required": [],
"properties": {
"query": {
"type": "string",
"minLength": 0,
"maxLength": 32
},
"limit": {
"type": "integer",
"minimum": 1,
"maximum": 256
}
}
}Illustrative output from the canonical adapter fixture and schema. It is not a completed paid execution or a current live observation.
{
"count": 0,
"pairs": [
{
"base": "USD",
"quote": "USD",
"symbol": "EUR/USD",
"name": "example",
"asOf": "2026-09-12"
}
],
"retrievedAt": "example0000000000000",
"source": {
"provider": "example",
"dataset": "example",
"sourceUrl": "https://example.com/resource",
"freeAccessUrl": "https://example.com/resource",
"retrievedAt": "example0000000000000",
"attribution": "example",
"notice": "example"
},
"warnings": [
"Verify the caller-supplied data before relying on this result."
]
}{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"additionalProperties": false,
"minProperties": 5,
"maxProperties": 5,
"required": [
"count",
"pairs",
"retrievedAt",
"source",
"warnings"
],
"properties": {
"count": {
"type": "integer",
"minimum": 0,
"maximum": 256
},
"pairs": {
"type": "array",
"minItems": 0,
"maxItems": 256,
"items": {
"type": "object",
"additionalProperties": false,
"minProperties": 5,
"maxProperties": 5,
"required": [
"base",
"quote",
"symbol",
"name",
"asOf"
],
"properties": {
"base": {
"type": "string",
"pattern": "^[A-Z]{3}$",
"minLength": 3,
"maxLength": 3
},
"quote": {
"type": "string",
"pattern": "^[A-Z]{3}$",
"minLength": 3,
"maxLength": 3
},
"symbol": {
"type": "string",
"pattern": "^[A-Z]{3}/[A-Z]{3}$",
"minLength": 7,
"maxLength": 7
},
"name": {
"type": "string",
"minLength": 1,
"maxLength": 256
},
"asOf": {
"type": "string",
"pattern": "^\\d{4}-\\d{2}-\\d{2}$",
"minLength": 10,
"maxLength": 10
}
}
}
},
"retrievedAt": {
"type": "string",
"minLength": 20,
"maxLength": 32
},
"source": {
"type": "object",
"additionalProperties": false,
"minProperties": 7,
"maxProperties": 7,
"required": [
"provider",
"dataset",
"sourceUrl",
"freeAccessUrl",
"retrievedAt",
"attribution",
"notice"
],
"properties": {
"provider": {
"type": "string",
"minLength": 1,
"maxLength": 128
},
"dataset": {
"type": "string",
"minLength": 1,
"maxLength": 256
},
"sourceUrl": {
"type": "string",
"pattern": "^https://",
"minLength": 9,
"maxLength": 2048
},
"freeAccessUrl": {
"type": "string",
"pattern": "^https://",
"minLength": 9,
"maxLength": 2048
},
"retrievedAt": {
"type": "string",
"minLength": 20,
"maxLength": 32
},
"attribution": {
"type": "string",
"minLength": 1,
"maxLength": 256
},
"notice": {
"type": "string",
"minLength": 1,
"maxLength": 512
}
}
},
"warnings": {
"type": "array",
"minItems": 0,
"maxItems": 8,
"items": {
"type": "string",
"minLength": 1,
"maxLength": 128
}
}
}
}Timeout: 12000 ms. Full schemas are in OpenAPI.
This schema-valid request returns the canonical HTTP 402 challenge without executing the service. A payment-capable client validates the challenge, signs only with prior authority and budget, and retries the identical body.
curl -i -X POST https://signalharness.ai/api/agent/services/fx_pair_list/invoke \
-H "Content-Type: application/json" \
--data '{"limit":50}'