offercheck
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. $0.002 per call.
Offering
- Provider
- offercheck.offercheck.workers.dev
- Method
- GET
- Offering type
- Api Endpoint
- Transport type
- http
- Category
- Financial Analysis
- Delivery
- Not provided
- Pricing model
- Not provided
- x402 version
- 2
Endpoint context
- URL
https://offercheck.offercheck.workers.dev/v1/fx- MIME type
- application/json
- First seen
- 2026-10-16T01:50:32.458Z
- Last seen
- Tags
- Finance, FX, exchange-rate, Currency, Crypto, Token, Price, market-data
Payment pricing
x402 payment terms are the authoritative price for calling this endpoint.
- Payment option 1
- 0.002 USDC
Atomic price: 2000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
{
"scheme": "exact",
"network": "eip155:8453",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "2000",
"payTo": "0xB9721FDD2EC85F7f604F5BBcA2292d7C4ff6B62c"
}
]Observed health
- Status
- Healthy
- Latest latency
- 187 ms
- Average latency
- 594 ms
- HTTP status
- 402
- Last checked
- Reachability
- 100% over 14 checks
Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.
Input schema
{
"type": "object",
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"type": "string",
"enum": [
"GET"
]
},
"queryParams": {
"type": "object",
"properties": {
"from": {
"type": "string",
"description": "Base currency, ISO 4217 code (default USD)",
"default": "USD"
},
"to": {
"type": "string",
"description": "Target currency or comma-separated list (default EUR); any of the 30 ECB currencies",
"default": "EUR"
},
"amount": {
"type": "string",
"pattern": "^[0-9]+(\\.[0-9]+)?$",
"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.",
"default": "1"
},
"date": {
"type": "string",
"description": "Optional historical date YYYY-MM-DD (ECB business days from 1999-01-04); omit for the latest rates"
}
},
"required": []
}
},
"required": [
"type",
"method"
],
"additionalProperties": false
}Output schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"amount": {
"default": "1",
"description": "Amount in the base currency to convert, as a decimal number string, e.g. \"100\" (default 1). Query parameters are strings, so the Coinbase Bazaar validator rejects a numeric type here.",
"pattern": "^[0-9]+(\\.[0-9]+)?$",
"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"
}