ProtoClinical Commerce

Stripe’s official MCP server for customers, products, payments, subscriptions, invoices, and refunds.

Redstone is free return and risk analytics for about 2,900 US stocks and 1,200 ETFs. It shows total returns with dividends reinvested, plus Sharpe, Sortino, max drawdown, beta and correlation, and supports comparisons, portfolio backtests and screens. No account is needed. A public read-only MCP server at https://redstonemarkets.com/api/mcp (Streamable HTTP, no API key) lets ChatGPT, Claude and other assistants query the data. Docs and the agent skill are in the MIT repo https://github.com/mihaitv/redstone-mcp.

SecretPass is a shopping club with coupon codes and deals for online shopping stores, with an open MCP server at https://secretpass.com/mcp (Streamable HTTP, no authentication) that lets AI assistants search current vouchers, coupons and discounts.

Sendpaper: physical mail for AI agents

MCP server

Sendpaper lets AI agents print and mail real postcards, letters and USPS Certified Mail to US addresses. You approve the preview and payment. Remote MCP server at https://sendmypaper.com/mcp (Streamable HTTP, no API key or account). Tools: get_pricing, create_postcard, create_letter, get_order, cancel_order, pay_order. A person reviews every piece before it is printed. Docs: https://docs.sendmypaper.com. Submitted by the maker.

BULLY Crypto Agent

MCP server

Free read-only contract checker for Robinhood Chain (chain ID 4663), built for AI agents. Verifies the official $BULLY contract (0xff0fa3799686ac47e3aff62aa2210a8441737cc3) against lookalikes and reads the chain live: token facts, proxy flags (EIP-1967/1822/1167, DELEGATECALL), owner/paused/burn reads, a 34-selector byte-pattern scan, Sourcify source match, and Uniswap v4 pools. Never trades, never touches a wallet, says unknown when it cannot read something. Also reachable over A2A and a plain JSON API.

Ecommerce product data for AI agents. Hosted MCP server (https://mcp.datawebot.com/mcp, OAuth sign-in) that searches products across online shops worldwide, lists every seller's price for one product with direct shop links, and runs extraction jobs on Amazon (10 countries), Walmart US and other stores. Free daily allowance and 200 trial credits.