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Universal, local-first persistent memory for AI assistants. SQLite-based knowledge graph with zero cloud dependencies. Works with 17+ tools (Claude, Cursor, Windsurf, VS Code, etc.). 100% free forever.

Local stdio MCP server for phone and email validation: check_phone (numbering-plan metadata, not live carrier data) and check_email (syntax and DNS only). Invitation-only free beta.

Find freelancers or work on a no-commission board in 6 languages (EN, RU, ES, PT, FR, DE): search offers and requests, message authors with automatic translation, propose price and deadline. Sensitive steps wait for the person's approval in Telegram. OAuth 2.1; read-only search without an account at https://synapticrelay.com/mcp/public.

Drives the browser you are already signed into, so work behind a login, SSO or MFA needs no scripted auth — 20 tools standalone, 99 with the free T3rnel Browser extension.

Evidence-graded index of where autonomous AI agents can earn: agent-work lanes with A/B/C/F grades, should-I-bid advice, hash-chained evidence and live agent jobs. 10 read-only tools, free without a key.

Time tracking for freelancers who bill hourly: start/stop the timer, log hours, see each client's unbilled time and who owes you. OAuth, runs inside your own tab account.

Find TableProof paid-review scopes and check SRT timing/text with two free read-only tools; OAuth required, no audio analysis or native Dots certification.

Taiwan legal research against official sources: statutes, court judgments, constitutional interpretations, legislative history. 14 tools, free, no API key.

Remote MCP server with 42 pay-per-call tools for agents: Solidity contract scans (Slither plus custom DeFi detectors), a pre-transaction address risk check for Ethereum and Base, OFAC SDN crypto-address screening, a scan of MCP server and agent skill packages before install, plus web page, PDF, DNS/RDAP and chain reads. Small free daily tier, then pay per call with x402 (USDC on Base)

Writes an original song for one person: describe who it's for, get lyrics, two full versions and cover art in about a minute. OAuth or API key, 3 free credits. Works in Claude, ChatGPT, Cursor, Coze.

Find an HS code, HTS code or customs code for a product and read the customs duty or import tax. Free, hosted, no API key.

Voice-first planning app. Dictate voice notes on iOS/Apple Watch, AI creates structured tasks and events. 21 MCP tools (read + write). Connect from Claude Code, Cursor, Windsurf. Free trial with promo code MCPBETA26.

Sentiment, language detection, readability, keywords, summaries and profanity filtering. Free tier, RapidAPI key.

LLM rankings fitted across public benchmarks: leaderboard, model profiles with Elo ± SE, head-to-head comparisons and source-linked benchmark scores. Free, no auth.

A field station for AI agents: free durable memory, an agent message board, a peer Q&A oracle, a daily question, and an open CC0 census of non-human web traffic. Remote MCP server — nothing to install.

A free remote MCP server for The Living Bread. Bible passages read word for word from a stored public domain text with an evidence label, keyword search and cross references, real churches, gatherings and prayer groups with honest freshness, and one next step into a real Christian community.

Agent arena: AI agents play server-refereed chess, Connect Four and Liar's Dice for ratings. Free, no key needed to start.

Hosted MCP server: search, price and order press placements across 1,600+ publications. Free AI-visibility audits too. No API key.

Thordata residential proxies cover 190+Geo with 100+ million real IPs, Residential & Mobile & ISP, AI IP Filter, unlimited concurrent, Free Test

Live threat intelligence for agents: incident clusters, threat actor and malware profiles, CVEs with KEV/EPSS/exploit status, and ransomware leak-site victims. Ten read-only tools over the ThreatCluster API with a free key (100 credits a day). Every result carries citation URLs.

US ETF and mutual fund holdings with the date and source of every holding: what a fund holds, which ETFs hold a stock, ETF overlap, portfolio look-through and risk, and what ETFs bought or sold on the latest close. Free, no API key, CC BY 4.0.

Daily indexes of real-world activity from public data (jobless claims, pump.fun launches, paid x402 calls), each day's reading timestamped in Bitcoin. Read-only, free, no key.

Find attraction and day-trip guides with sources and fact-check dates, read published travel advice, and create TicketGlide search links. Free, read-only remote MCP; no API key required.

Published end-of-day state of a rules-based SPY/QQQ index model. Read-only. Free tier: 30-day delay; Core key for the current state.

Official TimeToPost MCP: schedule to X, Bluesky, Mastodon, Tumblr, Telegram, WordPress, Ghost & more. Free, OAuth, no API keys.

What real football tippers predict, per match: home/draw/away shares, top scorelines, expert cohort. Free, no key, no odds.

Taiwan government procurement search & intelligence: 14M+ tenders, vendor win-rate reports, agency spending analysis, and bid price suggestions. Free remote MCP.

Run a free AI-visibility scan from inside your assistant: see how often ChatGPT, Claude, Perplexity and Gemini recommend a B2B company when buyers ask for vendors, and get the fixes.

Rewrite AI-assisted drafts so they read like your own writing. Remote MCP server (Streamable HTTP, endpoint https://tohuman.io/mcp) with one tool, humanize(text, intensity). Works in Claude Desktop, Claude Code, Cursor, ChatGPT connectors. API key auth, free tier.

Play Tokyo Futuro, a crew game on Robinhood Chain, as an AI agent: sign in with your own wallet, solve a free daily challenge, read the on-chain economy and link a companion. Never holds funds.