"MCP servers that work without API keys" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Pay-per-use APIs for agents: web research, data lookups, and metered endpoints billed to credits.
Build, validate and deploy workflows as Cloudflare Workers in your own account, with approval.
Engram is a persistent, long-term memory layer for AI agents and assistants. Claude, ChatGPT, Grok, Cursor and any MCP client share one memory, stored as plain markdown notes: your knowledge base, second brain and AI context in one place. No extraction step: the memory is the note itself, so you can read exactly what your AI remembers and fix it. Edit your memory in Obsidian (real-time sync), the web app, or on your phone. Hybrid keyword + semantic search (RAG over your notes) finds exact strings like error messages, config keys and IDs. Remote MCP server over Streamable HTTP with OAuth 2.1; notes encrypted at rest. Https://engram.page https://youtu.be/rwnPeZ-8Lqo?is=NI-N7BduydGAiZlF https://github.com/engram-app/Engram
Pay-per-call MCP tools for agents, settled with x402 (USDC on Base mainnet). 17 tools — text/data utilities plus x402/EVM-native: decode an x402 challenge, verify a settlement receipt on-chain, EIP-712 typed-data hashing, ABI encode/decode, Merkle-proof verify, keccak256, and EIP-55 address checks. No API keys.
Climate and disaster risk for any place or property: flood risk, heat waves, storms and hurricanes, wildfires, earthquakes, sea level rise and 7-day weather risk. Is it safe to go there? Ask about any city, address or coordinates and get this week's weather risk (heat, cold, wind, heavy rain, snow), wildfires, earthquakes, floods and cyclones happening nearby right now, long-term exposure to 2050 and 2080 (flood depth, sea level rise, extreme heat, drought, water stress) and the country's disaster-risk profile and rank among 194 countries. Also compares and ranks countries by risk for ESG and insurance research, and in Claude and other MCP Apps hosts shows an interactive map of the place right in the chat. Every value cites its source: INFORM, ND-GAIN, World Bank, CMIP6, ERA5, IPCC AR6, WRI Aqueduct, GDACS, NASA FIRMS, OpenAQ, ECCC GDPS. Remote, free, no API key, read-only.
Free perfume MCP server and fragrance API: 6,000+ perfumes, note pyramids, accords, similar scents.
Server-side conversion tracking for Meta, TikTok, etc. Set up tracking and ask about events.
Structural FEM for AI agents: frames, plates, buckling, seismic and Eurocode checks, solved locally.
Read-only Total CMS docs: Twig signatures, field types, schema options, the CLI and the REST API.
Load testing and synthetic monitoring platform: test with Playwright, Browser Bot, or Protocol Bots.
Find and inspect open model files with recorded SHA-256 hashes and licence labels. Connect agents through 28 discovery tools over hosted MCP, or install hugging-bay-mcp 0.1.10 for stdio. Public catalog reads require no account. The general profile also includes public report and request tools, which require user consent. A matching hash checks file bytes; it does not prove successful execution or permission for every use. Hosted MCP: https://huggingbay.xyz/api/mcp (Streamable HTTP). Docs: https://huggingbay.xyz/docs Repository: https://github.com/barneywohl/hugging-bay
Track and manage how your brand appears in AI answers: rank, mentions, sentiment, share of voice.
Fastio gives your team and AI agents a workspace for each project, bringing source files, comments and new work together. Connect a compatible MCP client to find files, answer questions from project material, and save results where the team can review and use them. \ Sign in through Fastio and choose the workspaces the connection can reach. Read Only connections expose read tools; Read & Write connections also allow changes. \ • **Files and folders:** browse, read, upload, and organize files, with version history and trash. • **Search:** find files by keyword; search file content and meaning when Deep Indexing is enabled and files have been processed. • **Metadata:** read, set, and search metadata fields, including extracted fields where available. • **Shares:** create and manage shares for sending or collecting files. • **Comments and members:** read and add comments, and manage workspace membership within your permissions. • **Activity:** search workspace events to see what changed. \ Hosted by Fastio, with no server installation required. \ • **Claude and most MCP clients:** https://mcp.fast.io/mcp/tools • **ChatGPT:** https://mcp.fast.io/mcp/operations • **ChatGPT and Codex:** Fastio plugin • **Claude Code, Cursor and similar coding agents:** https://mcp.fast.io/mcp/code • **Setup and client-specific capabilities:** https://mcp.fast.io/docs \ Paid plans. Monthly plans include a trial of up to 30 days. A card is required, and billing begins when the trial ends or trial credits run out, whichever comes first. No free plan.
Hosted login, teams, billing and feature flags for your SaaS app, set up by your AI assistant.
Swiss company-register intelligence: new GmbHs by canton, shared addresses, UID history, SHAB text
Your rental portfolio from any assistant: leases, rent, buildings, tenants and documents.
App Store & Google Play data for ASO: keywords, rankings, charts, reviews in 100+ countries.
MCP-native CRM: your assistant proposes updates, you approve them field by field.
Inboxapp lets you message contacts and manage conversations across X and LinkedIn. Connect your X and LinkedIn accounts to handle your social conversations from one place, making it easier to stay in touch with the people who matter to you. Use Inboxapp to: - Message contacts on X and LinkedIn. - Triage your inbox: see who is waiting on a reply and which conversations need attention first. - Stay on top of follow-ups and spot conversations that have gone cold. - Search past conversations and c
Code mode (preview): the AI writes a script against a typed foundry.* API and runs it in a sandbox.
