"Signal" matching MCP servers:

Local Signal MCP server: read via Signal Desktop, send via signal-cli

The most complete Signal MCP server and CLI.

Provides read-only access to Signal Desktop message history, enabling listing conversations, retrieving messages, and searching messages through MCP tools.

Let ChatGPT or Codex research X (Twitter) through an existing account: search Top and Latest, follow threads, compare feeds, find accounts, and link posts. Read-only, local Docker service.

MCP Server for retrieving Signal messages using signal-export logic.

Live X/Twitter search and AI trend digests without an API key, charging per call in USDC via x402. Enables real-time tweet search and AI summaries inside MCP clients.

Provides cryptocurrency trading signals, market analysis, and portfolio management capabilities across 15+ exchanges with AI-enhanced technical analysis, arbitrage detection, and risk assessment tools.

Startup engineering acceleration signals for VC investors. Tracks commit velocity, contributor growth, and repo expansion across 20 sectors via public GitHub data. No API key required.

Aggregates tech and AI signals from HackerNews, arXiv, Lobste.rs, and GitHub into a structured briefing. No authentication required.

Enables MCP clients to query live Polymarket and Kalshi odds, price history, movers, resolved and closing markets, cross-platform gaps, watch-based change tracking, and X/Twitter sentiment in a single call, paying per request in USDC on Base via x402. Also surfaces ticker-linked event markets and a free example call so agents can inspect results before spending.

Enables structured company-news briefs and sector-wide market-signal sweeps via the Perplexity Sonar API, returning fixed-section briefs and JSON-schema-constrained signal arrays with citations.

Enables users to find companies hiring by role and geography, qualify them, and monitor them for hiring changes.

Enables AI agents to access SignalK marine data with 90-96% token reduction by executing JavaScript code in V8 isolates for client-side filtering and processing.

Enables AI agents to search and retrieve market signals, revenue ideas, and growth tactics from 2,000+ curated entries across 18 sources.

One MCP server that gives AI agents nine live data tools — company hiring signals, SEC filings, academic papers, GitHub repos, Hacker News, Stack Overflow, clinical trials, Federal Register, and global news — all as flat, citation-ready JSON with pay-per-result billing.

Pre-build reality check for AI coding agents. Scans GitHub, Hacker News, npm, PyPI & Product Hunt in parallel — returns a 0-100 reality signal with real competitor data.

Local-first inspectable memory substrate for Claude Code. Three read-only MCP tools (search_pairs, compact_session, substrate_info) over a signal-scored parse of ~/.claude/projects/, zero outbound calls.

A content exploration MCP server that helps LLMs surface high-signal, unsummarized web content through clean APIs and Markdown conversion, with intelligent frontmatter steering and citation tracking.

Structured knowledge API for AI agents — fractal knowledge graphs, signal datasets, authority evidence reviews, open problems, and capability specs. Pay-per-query or subscription via Lightning, Stripe, or USDC.

Curated audio-news MCP server. Search trending articles, fetch narrated audio, subscribe topic feeds. OAuth 2.1 + RFC 7591 DCR. Free tier; premium briefings via x402 over stablecoin settlement.