"A GitHub repository for agent guardrails" 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.

Proof and repair for Apple coding agents: validate Swift, run Xcode evidence, and repair failures.

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

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

Scientific compute for AI agents: symbolic, numerical, quantum, chemistry, ODE. Paid via x402.

MCP server for Klever blockchain smart contract development.

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)

Precision math engine for AI agents. 203 exact methods. Zero hallucination.

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

Provides access to TakeProfit.com's Indie documentation and tooling — a Python-based scripting language for building custom cloud indicators and trading strategies on the TakeProfit platform.

Authenticated async Fable 5 Agent agent with status polling and artifact results.

Build a full backend from Claude Code — boards, data, REST APIs — plus a ready-made admin UI

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

Run, build, and validate firmware on virtual hardware from your AI agent. Hardware knowledge corpus.

MCP server for Superserve sandboxes: create, exec, and manage Firecracker microVMs

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

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

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

Run Python code in a secure sandbox without local setup. Declare inline dependencies and execute s…