Add btcnode.uk API - Bitcoin blockchain data with free tier

Author: btcnode-uk

README.md

@@ -395,6 +395,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Blockchain](https://www.blockchain.com/api) | Bitcoin Payment, Wallet & Transaction Data | `apiKey` | Yes | Unknown |
 | [blockfrost Cardano](https://blockfrost.io/) | Interaction with the Cardano mainnet and several testnets | `apiKey` | Yes | Unknown |
 | [Brave NewCoin](https://bravenewcoin.com/developers) | Real-time and historic crypto data from more than 200+ exchanges | `apiKey` | Yes | Unknown |
+| [btcnode.uk](https://btcnode.uk) | Bitcoin blockchain data, fees, mempool, SEC insider trades, Reddit sentiment. x402 micropayments for paid endpoints. | No | Yes | Unknown |
 | [BtcTurk](https://docs.btcturk.com/) | Real-time cryptocurrency data, graphs and API that allows buy&sell | `apiKey` | Yes | Yes |
 | [Bybit](https://bybit-exchange.github.io/docs/linear/#t-introduction) | Cryptocurrency data feed and algorithmic trading | `apiKey` | Yes | Unknown |
 | [CoinAPI](https://docs.coinapi.io/) | All Currency Exchanges integrate under a single api | `apiKey` | Yes | No |