tools by fourzerotwo

Currency conversion

Convert between ~30 currencies at the ECB reference rate for today or any date in the last 90 days.

Currency conversion Free

Convert between ~30 currencies at the ECB reference rate for today or any date in the last 90 days.

cost: Free then $0.001 / call
MCP tool: calculators__currency-convert
method: GET

Free up to 50 calls a day over MCP (500 with a free key), then $0.001 per call by card credit or USDC. Free key · Pay by card

GET https://fourzerotwo.si/v1/calculators/currency-convert

Param	Type	Description
from	string	ISO currency
to	string	ISO currency
amount?	string	Amount (default 1)
date?	string	YYYY-MM-DD (default latest)

# free: send a free key from https://fourzerotwo.si/free
curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/calculators/currency-convert?from=GBP&to=USD"

# no key: returns 402 with the price, for x402 agents
curl -i "https://fourzerotwo.si/v1/calculators/currency-convert?from=GBP&to=USD"

by fourzerotwo

Report this endpoint

Use it from an AI agent (MCP)

Add the server once, then ask for this data in plain English. The agent finds the endpoint with search_apis and runs it with call_api.

{
  "mcpServers": {
    "fourzerotwo": { "type": "http", "url": "https://fourzerotwo.si/mcp" }
  }
}

# the call the agent makes
call_api {"tool": "calculators__currency-convert", "arguments": {"from":"GBP","to":"USD","amount":"250"}}

Currency conversion

Currency conversion Free

Use it from an AI agent (MCP)

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