Official daily foreign exchange reference rates from the European Central Bank (
Official daily foreign exchange reference rates from the European Central Bank (~30 currencies vs EUR, published each business day around 16:00 CET), rebased on request to any listed currency via EUR cross-rates and filtered to a requested symbol list; returns the reference date, the rate table and the ECB source attribution.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
951 msmedian answer time
$0.005listed price per call
$0.005price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://4yearcycle.com/x402/fx-rates
| Category | Market data |
|---|---|
| Provider host | 4yearcycle.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.005 | 951 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"base": "USD",
"symbols": "EUR,GBP,JPY,CHF"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"additionalProperties": false,
"properties": {
"base": {
"default": "EUR",
"description": "Base currency as ISO 4217 code (case-insensitive). EUR or any of the ~30 ECB-listed currencies (USD, GBP, JPY, CHF, ...); non-EUR bases are computed as cross-rates via EUR. Default: EUR.",
"examples": [
"EUR",
"USD",
"GBP"
],
"pattern": "^[A-Za-z]{3}$",
"type": "string"
},
"symbols": {
"description": "Optional comma-separated ISO 4217 codes to restrict the rate table to (case-insensitive); codes the ECB does not list are ignored. Empty = all listed currencies.",
"examples": [
"USD,GBP,JPY",
"CHF"
],
"type": "string"
}
},
"required": [],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"base": {
"description": "Base currency of the rate table (ISO 4217)",
"type": "string"
},
"date": {
"description": "ECB reference date of the rates (YYYY-MM-DD, last business day)",
"type": "string"
},
"notice": {
"description": "ECB attribution notice: the underlying data is available free of charge from the ECB; cross-rates are computed values",
"type": "string"
},
"rates": {
"additionalProperties": {
"type": "number"
},
"description": "Units of each quoted currency per 1 unit of base, e.g. rates.USD = USD per base. ECB publishes vs EUR; other bases are cross-rates via EUR rounded to 6 decimals.",
"type": "object"
},
"source": {
"description": "Always \"ECB\" \u2014 European Central Bank euro foreign exchange reference rates",
"type": "string"
}
},
"required": [
"base",
"date",
"rates",
"source",
"notice"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}