Tool detail

Toll402

Returns the exchange rate between two ISO currencies using ECB reference rates, optionally converting a given amount.

Categories: Currency exchange

Use when

convert an amount between two currencies
look up the ECB reference rate between two currencies
get all ECB rates for a base currency

Not for

not real-time interbank/market FX rates (ECB reference only)
not crypto-to-fiat conversion

Inputs

GET query params (all optional): base (3-letter ISO, default USD), quote (3-letter ISO, omit for all rates), amount (number, default 1)

Admitted input schema

{
  "type": "object",
  "properties": {
    "amount": {
      "type": "number",
      "minimum": 0,
      "maximum": 9007199254740991,
      "default": 1
    },
    "base": {
      "type": "string",
      "minLength": 3,
      "maxLength": 3,
      "description": "ISO 4217 base currency",
      "default": "USD"
    },
    "quote": {
      "type": "string",
      "minLength": 3,
      "maxLength": 3,
      "description": "ISO 4217 quote currency; omit for all rates"
    }
  },
  "required": [],
  "additionalProperties": false
}

Endpoint

Method: GET
URL: https://toll402.dev/v1/fx

Payment

Protocol: x402
Listed price: 0.001 USDC per call on Base
Payment method: exact
Network: eip155:8453
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.

Source

Directory: Coinbase x402 Bazaar
Record: GET https://toll402.dev/v1/fx
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z