"Services or tools available for free without requiring an API key" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Run sandboxed Python for calculations and PDFs; no other languages, installs or network.
Cloud iPhones and Macs with Xcode for AI agents: build, run and test iOS apps, use the screen.
Agent utilities: read big pages without filling context, exact math, dates, parsing. Free.
Spin up a complete OpenCode development environment on any Linux box — one agent-driven workflow, six tools, zero secrets.
Expert know-how (kits) any AI can read or run, always the latest version.
Hosted MCP for Celesto cloud computers. Create, start/stop, exec, publish ports, and delete hardware-isolated sandboxes over OAuth.
Code mode (preview): the AI writes a script against a typed foundry.* API and runs it in a sandbox.
Universal pay-per-call tool API for AI agents. Web search, price feeds, hive memory, LLM routing, code sandbox. Free tier (10 calls/day, no signup). x402 payments on Base + Solana.
Proves AI-generated Python does what you asked: lint, types, security, sandbox run, exact fixes.
Precision math engine for AI agents. 203 exact methods. Zero hallucination.
Remote MCP server for Mythex, the AI app builder. Lets Claude, Cursor or Codex create projects in a cloud sandbox, edit files, run commands, preview, attach a database, and publish to a public URL. OAuth sign-in; tool calls need a Mythex Pro account.
Let your AI assistant build a runnable Symfony 8, Laravel 13 or plain PHP 8.5 project and hand you a shareable link. The code runs in the browser with WebAssembly: no install, no account, nothing stored server-side (the code travels inside the link). Tools: get_starter (starting project, editable paths, Composer packages), create_sandbox (builds the link), read_sandbox (reads the code behind a link). Great for demos, answering questions with runnable code, or turning a bug from your project into
Proof and repair for Apple coding agents: validate Swift, run Xcode evidence, and repair failures.
Create shareable links to run Symfony, Laravel or plain PHP code in the browser, no install.
Second opinion before an irreversible agent action; signed proofs, free verify, public ledger.
tasklite.net: hosted backend, REST API and admin for apps built by AI agents
Write, check and render parametric laser-cutting designs in KerfScript, as SVG or DXF.
A free quantum job service: OpenQASM 3 run, checked and signed, with no account or key.
A deterministic verification engine for agents. Proves a fix: fails on the old code, passes on new.
A neutral index of cloud sandboxes for AI agents.
Create and preview self-contained web apps in iPhone, Duo, iPad, or Headless views. Seven starter tools and games, browser-local code saving, and HTML export. Free; no API key. Tools: open_ipadian, preview_app. Interactive previews require MCP Apps support. Independent web simulator; no native iOS apps or cloud sync. Setup and Claude/Codex downloads: https://os.ipadian.net/plugin/
Hand routine JS/TS tasks to Codemind from your agent. $0.10 per verified build; failures are free.
Hosted Python sandbox for package runtime verification: pip install and usable-import evidence.
Write, deploy and host small C# web services and sites at a public address.
Open square for AI agents: solve sandbox-tested problems, earn Ed25519-signed proofs.
38 MCP tools: Rust computation, Discovery, composition, counterexample scans and signed checks.
Pay-per-call MCP tools via x402 USDC: ZAR prices, data extraction, Python sandbox, SA flights.
Docs for hot-module-reload and reactive programming for Python (`hmr` on PyPI)
Scientific compute for AI agents: symbolic, numerical, quantum, chemistry, ODE. Paid via x402.
MCP server for Klever blockchain smart contract development.
