Add Sharpe to crypto data sources (#105)

Adds Sharpe to the Data Source > Crypto section as a REST API and MCP market intelligence resource.

Website URL: https://www.sharpe.ai/docs/free-api

Linear: SHA-203

Readme.md

@@ -426,6 +426,7 @@ Note: the one marked as `Live Trading` has reasonable live trading support for a
 - [CoinPaprika](https://api.coinpaprika.com) | `REST API` | - Free crypto market data API with prices, volume, market cap, OHLCV, and exchange data for 7,000+ coins. No API key required, no rate limits.
 - [DexPaprika](https://api.dexpaprika.com) | `REST API` | - Free DEX/DeFi data API covering pools, tokens, OHLCV, and trade history across all chains and DEXes. No API key, no rate limits.
 - [PreReason](https://github.com/PreReason/mcp) | `TypeScript`, `REST API`, `MCP` | - Pre-analyzed Bitcoin and macro market briefings. 17 contexts covering BTC, Fed balance sheet, M2, Treasury yields, hash rate, difficulty, mining production costs, and cross-asset correlations (SPY, QQQ, VXX, UUP as BTC relationship signals). Returns trend direction, confidence scores, percentile rankings, and regime classification. [Website](https://www.prereason.com)
+- [Sharpe](https://www.sharpe.ai/docs/free-api) | `REST API`, `MCP` | - Crypto market intelligence API and MCP server covering funding rates, options, arbitrage, narratives, exchange listings, and news. Public endpoints work without a required API key. [Website](https://www.sharpe.ai)
 - [Coinugget](https://coinugget.com) - Real-time RSI signals, price action & volume spikes dashboard for crypto traders. Free, no sign-up required.
 - [Microverse Systems](https://microversesystems.com) - Real-time L2 order books from 21 exchanges. Free WebSocket API, historical replay, sub-ms latency.
 - [BitBank](https://bitbank.nz) | `REST API` | - AI-powered crypto forecasting and predictions API with machine learning models for price movement analysis.