Convert between 30 major currencies (USD, EUR, GBP, JPY, CHF, CNY, INR, ILS, AUD
Convert between 30 major currencies (USD, EUR, GBP, JPY, CHF, CNY, INR, ILS, AUD, CAD, ...) using the European Central Bank's daily reference rates: rate and converted amount for one or many target currencies, optional historical date back to 1999. Returns the ECB rate date and source. $0.002 per call.
Answeringour last check, 2026-09-26
1 of 1checks answered this week
384 msmedian answer time
$0.002listed price per call
$0.002price 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://offercheck.offercheck.workers.dev/v1/fx
| Category | Market data |
|---|---|
| Provider host | offercheck.offercheck.workers.dev |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-26 | valid payment request | 402 | $0.002 | 384 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"amount": "100",
"from": "USD",
"to": "EUR,GBP"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"amount": {
"default": "1",
"description": "Amount in the base currency to convert, as a decimal number string, e.g. \"100\" (default 1). Query parameters are strings, so the Coinbase Bazaar validator rejects a numeric type here.",
"pattern": "^[0-9]+(\\.[0-9]+)?$",
"type": "string"
},
"date": {
"description": "Optional historical date YYYY-MM-DD (ECB business days from 1999-01-04); omit for the latest rates",
"type": "string"
},
"from": {
"default": "USD",
"description": "Base currency, ISO 4217 code (default USD)",
"type": "string"
},
"to": {
"default": "EUR",
"description": "Target currency or comma-separated list (default EUR); any of the 30 ECB currencies",
"type": "string"
}
},
"required": [],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}