AgentStampIdentity, reputation, and verified passports for AI agents you can actually trust.

4.5 (4)

Reviewed by Daniel Nikulshyn·Updated July 2026

Agent Infrastructure Identity Trust & Safety API Developer Tools Reputation Security

Overview

AgentStamp is a trust infrastructure layer for AI agents, providing cryptographic identity stamps, reputation scoring, and verifiable passports that help systems decide which agents to interact with. It aims to make agent-to-agent and agent-to-service interactions more accountable in a landscape where autonomous software increasingly acts on behalf of users and businesses. Through its stamping and scoring system, agents accumulate verifiable histories tied to their behavior, ownership, and capabilities. Developers and platforms can use these signals to gate access, reduce fraud, and enforce policy when integrating third-party or external agents. The platform targets teams building agent marketplaces, automation pipelines, and multi-agent systems that need a shared trust layer rather than ad-hoc allowlists or manual review.

Key features

Cryptographic identity stamps for agents
Reputation scoring based on agent behavior
Verified agent passports
Trust signals for agent-to-agent interactions
Developer APIs for integration
Policy and access gating support

Pricing

Model: Free
Category: AI security
Rating: 4.5 / 5 (4)

Use cases

Gate access in agent marketplaces

Marketplace operators can require verified passports and minimum reputation scores before allowing third-party agents to transact or interact with users.

Secure agent-to-agent interactions

Multi-agent systems can use cryptographic identity stamps to authenticate counterparties and decide which external agents are safe to collaborate with.

Enforce policy on autonomous actions

Platforms integrate AgentStamp APIs to apply policy and access controls based on an agent's verified capabilities, ownership, and behavioral history.

Reduce fraud from rogue agents

Services exposed to autonomous agents can filter out low-reputation or unverified actors, cutting fraud and abuse without manual trust reviews.

Pros & Cons

Pros

Adds verifiable identity to autonomous agents
Reputation scoring helps filter risky actors
Useful for multi-agent and marketplace setups
Reduces reliance on manual trust decisions

Cons

Value depends on broad ecosystem adoption
Trust scoring methodology may need transparency
Adds an extra integration layer for developers

Reviews

4.5

Average from 4 ratings.

Olga Ivanova

Mar 11, 2026

Skeptical, then convinced

I went in skeptical — most tools in this space overpromise. It actually delivers on cryptographic identity stamps for agents, and useful for multi-agent and marketplace setups caught me off guard. still, I'd recommend giving it a real trial.

Sanjay Gupta

Feb 2, 2026

Solid for our team

We rolled this out across the team last quarter and useful for multi-agent and marketplace setups. Trust signals for agent-to-agent interactions fits neatly into how we already work, and cryptographic identity stamps for agents removed a step we used to do by hand. but it has held up under daily use.

Hiroshi Tanaka

Oct 3, 2025

Does the job

Pretty happy overall. Cryptographic identity stamps for agents just works and reputation scoring helps filter risky actors. Trust scoring methodology may need transparency can be annoying, but no dealbreakers — I'd recommend it to a friend without hesitating.

Gunnar Eriksson

Jul 10, 2025

Does the job

Pretty happy overall. Cryptographic identity stamps for agents just works and useful for multi-agent and marketplace setups. Trust scoring methodology may need transparency can be annoying, but no dealbreakers — I'd recommend it to a friend without hesitating.

Q&A

How is agent reputation scored, and how reliable are the signals?

Reputation scores are derived from an agent's verifiable history, including behavior, ownership, and capabilities tied to cryptographic stamps. However, the scoring methodology's transparency and overall value depend on broader ecosystem adoption, so signal strength may vary across contexts.

Asked by Omar Haddad · Jun 8, 2025

How does AgentStamp integrate with existing systems?

AgentStamp provides developer APIs that let you incorporate cryptographic identity stamps, reputation scores, and verified passports into your agent workflows. Platforms can use these trust signals to gate access and enforce policy, though it does add an extra integration layer to manage.

Asked by Wei Chen · May 28, 2025

What use cases is AgentStamp best suited for?

AgentStamp is designed for teams building agent marketplaces, automation pipelines, and multi-agent systems that need a shared trust layer. It's useful when you need to gate access, reduce fraud, or enforce policy across third-party or external agents interacting with your platform.

Asked by Naomi Suzuki · May 7, 2025