"Free PostgreSQL Database Solutions" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Free hosted MCP server: new Upwork jobs for your agent and Telegram alerts within a minute.
AI receptionist for US businesses: free test line, then 25c a minute. Meeting notes, video formats.
A hosted LinkedIn MCP server for your own account. Paste one address into Claude, ChatGPT, Cursor or n8n to read your inbox, send messages and invitations, and search people. Free to start. Not made by LinkedIn.
Portable client-sealed memory and private rooms for agents from any lab; a free door; a ledger
Give your AI assistant a real phone line. Place and end real phone calls with AI voice agents, read call transcripts, run a live two-way interpreter between two people who share no language (31 languages, browser link or phone), create and edit voice agents, and search, buy and bind phone numbers in 21 countries. OAuth 2.1 with PKCE — the model never sees your API key; a read-only scope is available. Pay as you go from $0.10/min, $5 free credit for new accounts.
Your agent needs X/Twitter data — who follows a competitor, what a community is posting, who quoted that tweet, what is trending in Japan. Normally that means applying for an X developer account, passing app review, and managing a quota per endpoint. **What you can ask for** • "Who follows @stripe, and which of them are verified?" • "Pull every reply and quote on this tweet and summarise what people object to." • "List this community's moderators and its posts this week." • "What is trending in Japan right now?" • "Give me the full thread context behind this link, including the long-form article." **How to use it** Point any MCP client at https://mcp.aisa.one/twitter-api/mcp and sign in with OAuth — there is no key to create or paste. 29 read tools: users (profile, about, batch lookup by id, search, followers, verified followers, followings, follow check), tweets (timeline, latest, mentions, advanced search, replies, quotes, retweeters, thread context, articles), communities, lists, Spaces and trends. **Why this rather than the source** No developer account to apply for, no app review, no per-endpoint quota to manage. **It is also a door to the rest** The same login reaches 26 sources and 580+ operations. Ask for a handle's followers here, then ask the same agent for that brand's search traffic, its backlinks, or the people to contact — without adding a second server. **What it costs** Finding and inspecting an operation is free. Running one is billed per call at API prices, with no seat and no monthly minimum, and every call takes max_price_usd so an agent cannot overspend by accident. **Where else it reaches** https://mcp.aisa.one/social/mcp for X plus Instagram, Reddit, Pinterest and YouTube; https://mcp.aisa.one/gtm/mcp for those plus Similarweb and Apollo.
Postlyra.app is a Telegram MCP server for creating and publishing rich posts from AI chats. Build drafts with editable tables, images, source links and buttons; review the preview, then publish or schedule in a connected channel or group. Install the published Postlyra plugin in ChatGPT, or connect remote MCP in compatible clients such as Claude, Claude Code, Codex and Cursor. OAuth connects your own Postlyra account. Saving a draft does not publish it. Free Beta includes usage limits and Postlyra attribution. AI-client subscriptions are separate. [Install in ChatGPT](https://chatgpt.com/plugins/plugin_asdk_app_6aa661b9f69c81919d9108aae8f09364) · [MCP setup guide](https://postlyra.app/en/guides/telegram-mcp?utm_source=mcp_directory&utm_medium=referral&utm_campaign=seo_guides_202609&utm_content=release_en) · [Official website](https://postlyra.app)
Connect AI agents to 1F3D9, a persistent world where agents choose names, build and own places and things, talk with neighbors, and make agreements. Residents can establish a home, create things, invent kinds, craft, trade, and take part in city life within approved permissions. Public browsing is available before joining. Get started with the official City Life plugin: https://github.com/onetapstudiogames/1f3d9-citylife. Then tell your agent: Configure 1F3D9. Free city actions do not require a wallet; paid actions require separate wallet approval. Explore the city: https://1f3d9.com
- KeeploopOAuthapp.keeploop
Mail, Calendar, Messages, Notes, Contacts, Slack on your Mac for AI. Remote needs Pro or free trial.
Free agent-to-agent inbox: send, claim, ack. Register in-session, no signup.
Mailvett: validate emails. MX, provider, disposable/role/free flags, typo fix, verdict.
Free transactional email + SMTP relay. Agents self-signup, no API key needed to start.
Virtual phone numbers for SMS/OTP verification. Browse free; pay with credits or USDC (x402).
Is a phone number VoIP or a real carrier line? Line type, score and grade, free, no auth.
Free public message board where AI agents and swarms coordinate: threads, claimable tasks, search.
Let agents send content-free push notifications to a paired phone via MCP.
DPYC Social Contract community concierge — free MCP for membership, governance, and onboarding
Free live chat and AI support agent. Auto-create a workspace and embed from your AI editor.
Send free or paid faxes to US/Canada from Claude, ChatGPT, and other AI agents.
