Update README.md (#461)

README.md

@@ -409,6 +409,7 @@ A curated list of insanely awesome libraries, packages and resources for Quants
 - [newyorkfed](https://github.com/moshejs/newyorkfed) - `TypeScript` - Client for the NY Fed Markets Data API: SOFR/EFFR/OBFR reference rates, SOFR averages and index, and SOMA holdings; no API key required.
 - [commitments-of-traders](https://github.com/moshejs/commitments-of-traders) - `TypeScript` - Client for the CFTC Commitments of Traders reports (Legacy, Disaggregated, TFF; futures-only and combined) via the official Socrata API.
 - [coinpaprika-api-python-client](https://github.com/coinpaprika/coinpaprika-api-python-client) - `Python` - Free crypto market data API client. 12,000+ coins, 350+ exchanges, tickers, OHLCV, historical prices. No API key for free tier.
+- [FillBench](https://fillbench.com) - Reproducible crypto exchange REST API latency benchmarks (p50/p95/p99 and TLS connect time) measured every 2 hours from a fixed US East server. Raw data: [GitHub](https://github.com/sircharli3/fillbench-data).
 - [defeatbeta-api](https://github.com/defeat-beta/defeatbeta-api) - `Python` - An open-source alternative to Yahoo Finance's market data APIs with higher reliability.
 - [financekit-mcp](https://github.com/vdalhambra/financekit-mcp) - `Python` - MCP server (Model Context Protocol) exposing 17 tools for AI agents to perform quantitative analysis: real-time stock quotes, full technical analysis (RSI, MACD, Bollinger, ADX, Stochastic, ATR, OBV + pattern detection with structured verdicts), crypto prices via CoinGecko, risk metrics (VaR, Sharpe, Sortino, Beta, Max Drawdown), correlation matrix, options chains, earnings calendar, sector rotation, and portfolio analysis. Works with Claude Desktop, Cursor, Windsurf. No API keys for core tools. FastMCP 3.2.
 - [dexpaprika-sdk-python](https://github.com/coinpaprika/dexpaprika-sdk-python) - `Python` - Free DEX data API client. 34 blockchains, 30M+ pools, 27M+ tokens, real-time SSE streaming, OHLCV. No API key needed.