Grey Ridge x402 Tools

• CollectionTool Access & Integration
• Classificationagent-native
• LicenseMIT
• MCPAvailable
• Agent SkillAvailable
• InterfacesAgent Skill · MCP · REST · CLI · API

• Website ↗
• Docs ↗
• Official repo ↗
• Full dossier on GitHub ↗

What it does

Grey Ridge x402 Tools gives an autonomous agent two preflight gates it can call on its own before it takes an irreversible action.

The first is mcpscan: every tool an MCP server advertises runs inside the agent’s context — its name, description and JSON schema are read by the model — so a poisoned or injection-laden tool description can steer the agent before any tool is ever invoked. mcpscan statically scans a server’s advertised tools for prompt-injection and tool-poisoning patterns (OWASP LLM01 / LLM08), returns a clear/review/block verdict, and is usable as a CI admission gate or an in-loop check.

The second is a pre-trade token gate for agents acting on Base: given a token address, it runs a live eth_call state-override transfer simulation (can a synthetic wallet actually sell the token?) plus a proxy/mint/pause/blacklist/fee-setter selector scan and an owner-renounce check, and returns allow / review / block. Both gates expose a free, keyless preview and a paid itemized endpoint settled per call in USDC over x402 on Base — no account and no API key.

Agent-facing interfaces

• Catalog protocols: Agent Skill, MCP, REST, CLI, API
• MCP: ✅ MCP-aware scanner, plus a hosted MCP server entry.
• Agent Skill: ✅ Available
• Onboarding type: mcp

How agents onboard

# Keyless CLI, no install — scan any MCP server's advertised tools before trusting them.
# (the package ships multiple bins, so -p selects mcpscan)
npx -y -p github:rezearcher/greyridge-x402-tools#v0.3.0 mcpscan https://mcp.deepwiki.com/mcp

# Coding-time Skill / Claude Code plugin:
/plugin marketplace add rezearcher/greyridge-x402-tools

See the full onboarding section in the dossier.

Protocol surface