Add polyorderbooks/mcp-server to Finance & Fintech.

Historical Polymarket order book depth — full L2 ladders at 1-second resolution on
resolved markets.

There are already several good Polymarket servers on the list. They wrap
Polymarket own Gamma and CLOB APIs, which serve the current book and 1-minute
price history; none can serve historical depth, because Polymarket does not
archive it at any granularity. This one serves depth that was captured live,
which is the gap rather than a duplicate.

TypeScript, npx-installable, MIT.

README.md

@@ -2105,6 +2105,7 @@ px goldbean-mcp\.
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+- [polyorderbooks/mcp-server](https://github.com/polyorderbooks/mcp-server) 📇 ☁️ - Historical Polymarket order book depth — full L2 bid/ask ladders at 1-second resolution on resolved markets, plus prices, spread and liquidity. Polymarket archives no order book history, so this serves depth captured live.
 ### 🎮 <a name="gaming"></a>Gaming
 
 Integration with gaming related data, game engines, and services