AgentStamp

What is AgentStamp?

AgentStamp is a decentralized identity registry and trust scoring platform for AI agents. Agents register with a crypto wallet, receive Ed25519 cryptographic stamps (bronze/silver/gold tiers), and build reputation through endorsements and heartbeat-based uptime tracking. Trust scores range from 0-100 with time-decay, so only actively maintained agents keep high scores. Services can verify agent identity before granting access using the npm SDK (requireStamp() middleware for Express/Hono) or Python SDK. Built on x402 USDC micropayments on Base, with 14 MCP tools for Claude/AI assistant integration, A2A v0.3 passport protocol support, and ERC-8004 compatibility. Open source, developer-first, free tier available.

Key features

• Ed25519 cryptographic identity stamps (bronze/silver/gold tiers)
• Trust scoring 0-100 with time-decay and heartbeat tracking
• 14 MCP tools for Claude and AI assistant integration
• x402 USDC micropayments on Base for pay-per-verification
• Express/Hono middleware SDK — gate APIs with requireStamp()

Use cases

• Verify AI agent identity before granting API access
• Build agent reputation through endorsements and uptime tracking
• Gate paid services behind trust-verified agent stamps
• Multi-agent coordination with verifiable identity
• Supply chain security for AI agent skills and plugins