AgentStamp

Freemium

Open Source

AI Security

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Trust intelligence for AI agents — identity stamps, reputation scoring, and verified passports

https://agentstamp.org

Published 2026/03/21

AgentHunter

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Agent Details

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

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