"Free tools or resources that do not require an API" matching MCP connectors:

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.

AI-agent verifier: verdict committed before the outcome graded against it; /review, /ledger.

Generate a Flutter app from a JSON spec free; pay only for the compiled APK (USDC on Base).

Pay-per-call MCP tools via x402 USDC: ZAR prices, data extraction, Python sandbox, SA flights.

40+ developer tools from Context7, Code Runner, Python Execute, NPM Sentinel, PlantUML, and Microsoft Learn. Docs lookup, code execution, security scanning. Starts at $0.01/call. Get your API key at app.xpay.sh or xpay.tools

Pay-per-call DNS/TLS truth and npm/PyPI breakage checks via x402. No account or API key.

Anima MCP connects your AI coding assistant directly to Anima Playground. It bridges the gap between PM prototypes and production code.

cdbx MCP server for Experiments, Projects, and sandboxed code execution (Python, Go, C#, Rust).

Confidential AI execution with a post-quantum receipt on every job — verifiable by anyone.

run any ai model. compose agents, stack knowledge, connect tools. one api, pay per run.

OpenAI-compatible AI inference, code, embeddings & agent tools for bots — and mine ANM.

Deploy serverless TypeScript on Val Town: HTTP vals, cron, SQLite, email, OAuth.

MCP task execution sandbox. 4 tools for claim→execute→submit lifecycle with idempotent claims, duplicate-safe submissions, content validation, and 7-day execution expiry.

Reasoning, code, anti-deception, memory harness MCP tools. Stdio or HTTPS api.ejentum.com/mcp

Plan, implement, and validate software changes using a virtual computer equipped with a full coding agent, development tools, browsers, and file access. Coding Agent by OpenHelm enables your agent to carry out work such as: • Implementing new features • Fixing bugs • Refactoring codebases • Updating documentation • Creating and validating pull requests

QuLab MCP remote server (Streamable HTTP) for computational science and lab tools.

An MCP server for Arcjet - the runtime security platform that ships with your AI code.

Execute code in 8 programming languages via gVisor-sandboxed Docker containers. Supports Python, JS, TS, Go, Java, C++, C, and Bash.

8 AI services via MCP: content, code, image, docs, data extraction, translation, SEO, email.

Kickstart development with a customizable TypeScript template featuring sample tools for greeting,…