Add Live Tennis API to Prediction Markets (#151)

* Add Live Tennis API to Prediction Markets data sources

* Correct free-tier daily quota: 100/day

Readme.md

@@ -469,6 +469,7 @@ Note: the one marked as `Live Trading` has reasonable live trading support for a
 - [TBD Predict](https://github.com/ego-protocol/tbd-vote-cli) | `TypeScript` | - Solana-based prediction market for human opinions with an agent CLI (`@tbd-vote/cli`) and AGENTS.md spec for AI agents to authenticate, list opinion campaigns, and place bets via JSON-friendly commands. [Website](https://www.tbd.vote)
 - [PolyMind](https://polyminds.netlify.app/) | - Real-time Polymarket trading alerts with multi-AI analysis (Groq, Claude, Gemini). Monitors 200+ markets every 15 seconds across 12 signal types: whale bets, volume spikes, price reversals, coordinated wallets, and more. Free tier available.
 - [marketlens](https://marketlens.trade) | `Python`, `REST API` | - Tick-level Polymarket L2 order book history covering the whole catalog (crypto, sports, weather, economics) from March 2026, served as REST or parquet exports, with a backtesting engine that models queue position, latency, slippage and settlement delay. Free tier, then from $39/mo. [GitHub](https://github.com/marketlenstrade/marketlens-python)
+- [Live Tennis API](https://livetennisapi.com) | `REST API`, `WebSocket`, `MCP` | - Event-side data feed for trading tennis markets on prediction exchanges: real-time scores with serving and break-point state, model win probabilities, H2H, rankings, and a 1968-2022 point-by-point archive for backtesting. Free tier (30 req/min, 100/day); WebSocket and win probability on the top tier. [GitHub](https://github.com/livetennisapi/livetennisapi-mcp)
 
 ## Broker APIs