Audit Market Data source placement and free access (#684)

* Audit market-data source placement and free access

* Defer Helium correction pending service reachability

README.md

@@ -436,18 +436,15 @@ A curated list of insanely awesome libraries, packages and resources for Quants
 - [treasury-fiscaldata](https://github.com/moshejs/treasury-fiscaldata) - `TypeScript` - Typed client for the US Treasury FiscalData API (debt, average interest rates, exchange rates) with pagination and filtering; no API key required.
 - [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).
 - [The Gold Barometer](https://github.com/thegoldbarometer/data) - `Python` - Daily gold buying-conditions score (0-100), free JSON API and CC BY dataset back to 1971.
 - [OpenChainBench](https://openchainbench.com) - `Go` `TypeScript` - Continuous open-source benchmarks for blockchain RPC latency (22 EVM chains + Solana), perp DEX all-in cost (fees + funding), bridge quote fees, and oracle deviation across Chainlink/Pyth/Redstone. MIT licensed, no API key. [GitHub](https://github.com/ChainBench/OpenChainBench)
 - [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. 36 blockchains, 36M+ pools, 33M+ tokens, real-time SSE streaming, OHLCV. No API key needed.
 - [pricehub](https://github.com/eslazarev/pricehub) - `Python` - Unified package for collecting OHLC prices from Binance, Bybit, Coinbase, OKX, Kraken, KuCoin, and Bitget (spot & futures) into a DataFrame, with flexible timestamp inputs and a wide range of intervals.
 - [Helium MCP](https://heliumtrades.com/mcp-page/) - `Python` - Live stock/ETF/crypto data with AI-generated bull/bear cases and price forecasts, proprietary ML options pricing with probability ITM and fair value, and news bias scoring across 5,000+ sources. Available as MCP server or API. Free tier: 50 queries, no signup.
 - [findatapy](https://github.com/cuemacro/findatapy) - `Python` - Python library to download market data via Bloomberg, Quandl, Yahoo etc.
 - [googlefinance](https://github.com/hongtaocai/googlefinance) - `Python` - Python module to get real-time stock data from Google Finance API.
-- [Horus Flow](https://github.com/horustechltd/horus-flow-mcp) - `Python` - Sub-second L2 orderflow intelligence MCP server for institutional-grade market microstructure analysis.
+- [Horus Flow](https://github.com/horustechltd/horus-flow-mcp) - `Python` - Order-flow analytics with order-book imbalance and rolling trade-delta calculations, plus an MCP interface.
 - [AlphaSMO](https://github.com/alphasmo/alphasmo-tools) - `TypeScript` - CLI + MCP server for SEC 13F institutional holdings, Form 4 insider trading, and smart money convergence signals (tickers where hedge funds and company insiders are both buying). Free anonymous tier, no signup required.
 - [yahoo-finance](https://github.com/yahoo-finance/yahoo-finance) - `Python` - Python module to get stock data from Yahoo! Finance.
 - [pandas-datareader](https://github.com/pydata/pandas-datareader) - `Python` - Python module to get data from various sources (Google Finance, Yahoo Finance, FRED, OECD, Fama/French, World Bank, Eurostat...) into Pandas datastructures such as DataFrame, Panel with a caching mechanism.
@@ -520,7 +517,6 @@ A curated list of insanely awesome libraries, packages and resources for Quants
 - [filingrail-mcp](https://pypi.org/project/filingrail-mcp/) - `Python` `MCP` - MCP server and Python SDK for a SEC EDGAR REST API covering XBRL fundamentals, Form 4 insider trades, 8-K events, 13F holdings and filings, where every record carries the source sec.gov filing URL it came from. [GitHub](https://github.com/adamhudson777/filingrail-mcp)
 - [disclosure-alpha](https://github.com/alwank/disclosure-alpha) - `Python` - Deterministic SEC filing analytics for 10-K/10-Q: section extraction, tone and boilerplate metrics, year-over-year diff, and reproducible disclosure risk scores. CLI, Python SDK, HTTP panel screener, and MCP — no LLM required.
 - [edgar-traps](https://pypi.org/project/edgar-traps/) - `Python` - Checks that catch nine silent failure modes in SEC filing data, from Form 4 filings that are about a different issuer to 13F-NT counted as a position report, each documented with the incident that found it. [GitHub](https://github.com/researchaiexe-stack/edgar-traps)
-- [Tradevo Data](https://github.com/christianpichichero-max/pit-fundamentals) - `Python` - Point-in-time US equity fundamentals from SEC EDGAR that stamp each figure with the date it first became public and flag later restatements, so fundamental backtests avoid lookahead bias; free CC0 sample of 40 large-caps, with a paid JSON API. [Website](https://tradevodata.com)
 - [buried-events-parser](https://github.com/jaablon/buried-events-parser) - `Python` - FilingFirehose’s standalone SEC 8-K HTML parser using regex rules to flag possible discrepancies between reported item codes and filing text.
 - [FXMacroData](https://fxmacrodata.com/) - `Python` - Real-time forex macroeconomic API for all major currency pairs sourced from central bank announcements. [GitHub](https://github.com/fxmacrodata/fxmacrodata)
 - [uk-sic-codes](https://pypi.org/project/uk-sic-codes/) - `Python` - UK SIC 2007 industry classification code lookup, search, and validation. 731 codes, 21 sections.
@@ -547,7 +543,7 @@ A curated list of insanely awesome libraries, packages and resources for Quants
 - [Backtesting Arena](https://tradingstrategies.work/api) - `TypeScript` - REST + MCP API for point-in-time Bitcoin cycle scoring, 22 on-chain series since 2009 (MVRV, NUPL, SOPR, Mayer, Puell), macro-regime composites and look-ahead-aware backtest validation with Deflated-Sharpe-Ratio correction across crypto, stocks, ETFs, commodities and forex. Free tier. [GitHub](https://github.com/Schoasch/skill-backtesting-arena)
 - [EarningsCall](https://github.com/EarningsCall/earningscall-python) - `Python` - REST API and Python/JavaScript SDK for earnings call transcripts, audio files, and slide decks for 9,000+ public companies. Includes speaker-level data, Q&A segmentation, and earnings calendar.
 - [Korean Market Data](https://github.com/james-brand/korea-market-data) - `Data` - Daily foreign and institutional net flows for every KOSPI/KOSDAQ common stock plus all 44 KRX sector indices with returns and excess return vs market, in English CSV/JSON under CC BY 4.0 with a Zenodo DOI, rebuilt each trading day.
-- [AgentServices](https://agentservices.to) - `Python` - x402-paid crypto and market data API platform: 54 services, 97 endpoints, 37 MCP tools. Real-time prices, technical indicators, on-chain data, and market intelligence with on-chain USDC payments on Base. [GitHub](https://github.com/vbkotecha/agentservices-api)
+- [AgentServices](https://github.com/vbkotecha/agentservices-api) - `Python` - API server for crypto and market data with technical indicators, on-chain analytics, and MCP access; includes x402 payment support for hosted endpoints.
 - [The Stall](https://github.com/thebrierfox/the-stall) - `JavaScript` `MCP` - Self-hostable data and analytics service with equity technical indicators, multi-chain portfolio valuation, market-data adapters, and MCP interfaces.
 
 
@@ -691,6 +687,10 @@ A curated list of insanely awesome libraries, packages and resources for Quants
 
 ## Commercial & Proprietary Services
 
+- [CoinPaprika](https://coinpaprika.com/api/) - `Python` - Cryptocurrency market data API with 20,000 free calls per month for personal use, including one year of daily price history, without an API key. [GitHub](https://github.com/coinpaprika/coinpaprika-api-python-client)
+- [FillBench](https://fillbench.com) - Free crypto-exchange API latency benchmarks with p50/p95/p99 measurements, separate TLS timing and downloadable CC BY datasets. [GitHub](https://github.com/sircharli3/fillbench-data)
+- [DexPaprika](https://dexpaprika.com/) - `Python` - DEX pool, token and OHLCV data API with 50,000 free monthly credits without signup and up to 60-second data delays. [GitHub](https://github.com/coinpaprika/dexpaprika-sdk-python)
+- [Tradevo Data](https://tradevodata.com) - `Python` - Point-in-time US equity fundamentals from SEC EDGAR with filing dates and restatement flags; free API access includes 250 requests per day without a credit card, and a 40-company CC0 annual dataset is available without signup. [GitHub](https://github.com/christianpichichero-max/pit-fundamentals)
 - [Massive](https://massive.com/) - Financial market data API with a permanent free personal-use tier offering two years of US stock history, end-of-day prices, and reference data at five requests per minute, with no credit card required. [GitHub](https://github.com/massive-com/client-python)
 - [SimpleFunctions](https://simplefunctions.dev/) - `REST` `CLI` `MCP` - Hosted Kalshi and Polymarket data and analysis service with a free tier of 1,000 requests/month and 60 requests/minute, without payment information.
 - [Trends MCP](https://www.trendsmcp.ai/) - `MCP` `REST` - Search, social, commerce, and news-sentiment data for alternative-data research, with a permanent free tier of 100 requests/month, 90 days of history, and top-10 trend boards delayed 24 hours. [GitHub](https://github.com/trendsmcp-ai/Trends-MCP)