a2a-x402: The A2A x402 Extension brings cryptocurrency payments to the Agent-to-Agent protocol, enabling agents

by google-agentic-commerce · MCP Server · ★ 563

Last updated: · Indexed by AgentSkillsHub · Auto-synced every 8h

Security audit verdict: SAFE · quality 61/100

None of the 42 rules matched — no credential harvesting, no data exfiltration, no curl-pipe-shell installer. Scanned against 42 published rules built on the SlowMist agent-security taxonomy, refreshed every 8 hours. Full audit →

The quality score combines nine heuristic checks of the repo and its README: completeness, clarity, specificity, examples, structure, agent readiness, step-by-step content, instruction quality and security notes. It rates how well the project explains itself to an agent, not the code.

a2aa2a-protocolagentic-aiagentsgen-aigenerative-aimcp

Quick Facts

Stars563
Forks151
LanguagePython
CategoryMCP Server
LicenseApache-2.0
Quality Score61/100
Open Issues64
Last Updated2026-08-04
Created2025-06-10
Platformsmcp, python
Est. Tokens~78k

About a2a-x402

A2A x402 Extension The A2A x402 Extension brings cryptocurrency payments to the Agent-to-Agent (A2A) protocol, enabling agents to monetize their services through on-chain payments. This extension revives the spirit of HTTP 402 "Payment Required" for the decentralized agent ecosystem.

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How this security grade is produced

Grades come from a rule-based scan built on the SlowMist agent-security taxonomy: 42 published rules, covering credential harvesting, data exfiltration, curl | sh installers and more. It is a first-layer scan, not a manual audit — we say so rather than overstate it.

The scale of the problem is documented independently: Liu et al. (2026), in a study of 31,132 agent skills, report that 26.1% contain security vulnerabilities. Our own full-catalog census is published as a citable open dataset.

Sources & who's responsible:

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