Bitcoin price API: BTC in USD, EUR, GBP and sats per dollar

$0.01 per call · failed calls are never charged · no account or subscription: pay per call with a card key or USDC

Current Bitcoin (BTC) spot price in USD, EUR, GBP, CAD, CHF, AUD and JPY, averaged across major exchanges, with the number of satoshis per US dollar and the time of the price. Use to convert between sats and fiat, to value a Bitcoin or Lightning payment, or to check the BTC price before a trade.

When to use it

Guide: Currency exchange rate API

Run it free (25 free calls) Buy credits by card (from $1) Example result (JSON)

Try it with your own inputs

Optional: also price BTC in this currency; the seven listed ones come from the source, others (SEK, NOK, INR, BRL…

Uses one of your 25 free calls. Nothing is charged, and a call that fails is not counted.

Inputs

NameTypeDescription
currencystringOptional: also price BTC in this currency; the seven listed ones come from the source, others (SEK, NOK, INR, BRL and about 25 more) are converted from USD at the ECB reference rate

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://tools.funwords.eu/btc-price?currency=SEK"

Or one of your 25 free calls, no key:

curl "https://tools.funwords.eu/btc-price?currency=SEK&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

Example result

{
  "asset": "BTC",
  "prices": {
    "USD": 83463,
    "EUR": 74624,
    "GBP": 63152,
    "CAD": 118855,
    "CHF": 69423,
    "AUD": 119532,
    "JPY": 13210661
  },
  "satsPerUsd": 1198,
  "usdPerSat": 0.00083463,
  "priceTime": "2026-10-13T09:10:05.000Z",
  "source": "mempool.space (average of major exchanges)",
  "checkedAt": "2026-10-13T09:12:00.000Z"
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is btc_price, and the first 25 successful calls are free:

https://tools.funwords.eu/mcp

Questions

Where does the price come from?

mempool.space, an average across major exchanges, with the time of the price in the result.

Which currencies?

USD, EUR, GBP, CAD, CHF, AUD and JPY, plus satoshis per US dollar.

How do I pay?

Each successful call costs $0.01; failed calls are not charged. The first 25 calls are free. Then pay with card credits (from $1; the key goes in an Authorization header or, for clients that can only fetch a URL, as api_key= in the URL) or per call in USDC over x402 or MPP. No account is needed.

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