fx_rate $0.001 per call

Exchange rate between two ISO currencies (ECB reference rates), optionally converting an amount.

For AI agents: call fx_rate
POST https://toll402.dev/v1/fx
{
 "base": "USD",
 "quote": "MXN",
 "amount": 100
}
Answers 402 with x402 payment requirements; pay with any x402 client (@x402/fetch, x402 for Python, toll402-client, toll402-mcp) or send a prepaid-credits key as x-toll402-key (https://toll402.dev/credits). Paid per call via x402 (USDC on Base) or with a prepaid-credits key (x-toll402-key, card at /credits); charged only on success. Start at /llms.txt or connect the MCP server: npx -y toll402-mcp · remote https://toll402.dev/mcp.

Input schema

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

Example output

{
 "base": "USD",
 "quote": "MXN",
 "rate": 18.42,
 "amount": 100,
 "converted": 1842,
 "date": "2026-09-05"
}

MCP

{"mcpServers":{"toll402":{"command":"npx","args":["-y","toll402-mcp"],"env":{"TOLL402_WALLET_KEY":"0x..."}}}}

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