"Supabase (open source Firebase alternative)" matching MCP connectors:

Search, summarize and organize your WhatsApp chats from Claude, ChatGPT or Cursor: contacts, groups, labels, notes, reminders and scheduled messages. Tool calls run in the Kaption extension for WhatsApp Web (Chrome, Edge) or the Kaption desktop app, which must be open. Sign-in is OAuth 2.1 with a code sent on WhatsApp. No send-now tool. Setup: https://kaptionai.com/mcp/

x402 pay-per-call tools for AI agents: code review, data clean, briefs, regex, diff, URL meta.

Reduce supplied context and check caller-declared, source-specific exact evidence retention.

20 MCP tools + 17 widgets for SAT/ISEE/SSAT/GRE/GMAT/LSAT prep. Flashcards, quizzes & games. Hosted.

Clarity Today's briefing, latest stories by desk, search and full source-linked stories.

Document inventory, extraction, summaries and comparison with source quotes and usage billing.

OCR and document understanding: extract text from images, then summarize or translate it.