Agent Security Gate x402: an open-source <2ms deterministic security gateway for MCP tools and autonomous agents
EstablishmentTough18 · reddit · 2026-10-22
- Open-source Agent Security Gate x402 is a deterministic security gateway for MCP tools and autonomous agents, with <2ms latency and 23,000+ installs across PyPI and npm.
- Targets three production risks: prompt injection hijacking tool calls, agents generating malicious code like eval()/os.system(), and irreversible transactions without cryptographic proof.
- Components: a zero-LLM-latency injection filter (regex/heuristics blocking DAN prompts and privilege escalation), a static AST code sanitizer, a 1-line fail-closed ElizaOS plugin, and a CleanWeb token compressor claiming 87% compression.
- Also includes an HTTP 402 multi-chain escrow rail settling micropayments on Solana mainnet (0.4s finality) and EVM chains (Polygon, Base, Arbitrum) against deterministic truth oracles.
- Ships a 1-minute setup for Claude Desktop / Cursor via uvx.
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