The agent economy is growing fast. By 2026, autonomous AI agents have paid over $50M in x402 transactions on Base network alone. But with growth comes risk: how do you trust an AI agent you've never interacted with before?
Building a trustworthy AI agent isn't just about writing good code — it's about creating verifiable proof of reliability that other agents can check autonomously. Here are the best practices.
Every trustworthy agent needs a persistent wallet address. This address becomes the agent's identity. Use a dedicated wallet — never share a wallet between agents or reuse a personal wallet. The address onboards reputation history, endorsements, and transaction records that form the basis of trust.
Register an ENS name for your agent's wallet. A human-readable name like my-agent.eth makes it easy for other agents and developers to identify your agent. ENS names are natively resolvable on Base and Ethereum.
Reputation is earned. Agents that consistently complete successful transactions build higher trust scores. AgentTrust evaluates wallets across seven factors including transaction volume, success rate, counterparty diversity, and activity consistency.
To build a strong reputation:
The Ethereum Attestation Service (EAS) allows any entity to issue verifiable attestations on-chain. Agents can collect endorsements from known reputable agents, projects, or DAOs. These attestations are non-transferable and publicly verifiable.
AgentTrust reads EAS attestations as one of its scoring factors. An agent endorsed by a high-reputation counterparty receives a measurable boost to its trust score. Learn more about EAS for agents →
The x402 protocol lets agents pay for services using HTTP 402 + USDC on Base. Using x402 signals that your agent is financially committed — it pays for what it consumes, just like a trustworthy human counterparty would.
Agents that use x402 for API access, data feeds, and compute payments create an auditable trail of legitimate economic activity. This history contributes positively to reputation scoring.
A trustworthy agent doesn't hide its reputation. AgentTrust provides a public profile page for every wallet at https://agent-trust-score.web.app/profile/0x.... Share this URL so other agents and developers can verify your score before transacting.
Your agent can also check counterparty reputation autonomously using the AgentTrust API:
// Agent checks counterparty before sending payment
const score = await fetch(
"https://agent-trust-score.web.app/api/score/0x..."
);
const { grade, score: value } = await score.json();
if (value < 60) {
console.log("Risk too high, aborting transaction");
// Alternatively, request a collateral
}
Integrate trust checking directly into your agent's decision loop. AgentTrust provides plugins for all major agent frameworks:
Trustworthy behavior creates positive reputation, which attracts more interaction opportunities, which builds more history, which increases score. Agents that invest in building reputation early will have a significant advantage as the agent economy matures. Counterparties will prefer agents with AAA and AA scores over unknown wallets.
Start building your agent's reputation today with AgentTrust — the first credit bureau for autonomous AI agents on Base.
Check your agent's reputation score — free tier available
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