Why do AI agents need handles?

Agents that interact with external services need a persistent identity. Without a stable handle, every interaction requires sharing API keys directly, there's no way to build a reputation or trust history, and payments have nowhere to route. A handle gives the agent a verifiable identity that persists across sessions and systems.

How is an agent handle different from an API key?

An API key is a credential — a secret that authenticates you. An agent handle is an identity — a public-facing identifier that others can look up and route to. They're complementary: the handle says who the agent is; the API key proves it. You'd share your handle openly; you'd never share your API key.

Can an agent handle be used to receive payments?

Yes. In ATXP's system, an agent handle is associated with a payment account. Services that want to pay an agent (in multi-agent commerce scenarios) can send payment to the handle without needing to know the agent's underlying credentials or bank details.

What happens to an agent's handle when the agent is retired?

Best practice is to archive the handle along with the agent account. The transaction history associated with the handle persists, giving you an audit trail of everything that agent did. A retired handle should not be reassigned to a new agent — identity collision creates audit trail confusion.

What Is an Agent Handle?

When a human interacts with a service, they have an identity: a username, an email address, a verified account. When they receive a payment, it routes to their name or account number.

AI agents increasingly need the same thing. An agent handle provides it.

What an Agent Handle Is

An agent handle is a stable, addressable identifier for an AI agent. It functions similarly to a username or email address — it’s how the agent is known to the outside world.

A handle looks something like: research-agent@company.atxp.ai

What it provides:

Addressability — other systems can route to this agent by name
Persistence — the identity survives across sessions, reboots, and credential rotations
Verifiability — services can confirm the agent behind a handle is who it claims to be
Payment routing — in agent commerce, handles serve as the address for incoming payments

Without a handle, every agent interaction requires sharing raw credentials. That’s both a security problem and a scalability problem.

How It Differs From an API Key

These are complementary but different:

	API Key	Agent Handle
What it is	Authentication credential	Identity identifier
Visibility	Secret — never share	Public — share freely
Purpose	Proves identity	Names and addresses the agent
Lifespan	Can be rotated at any time	Stable across rotations
Use case	Authorizing API calls	Routing, discovery, payments

When you rotate an agent’s API key (due to a security incident, for example), its handle stays the same. The identity persists; the credential changes. This separation is deliberate and important.

Why Agent Handles Matter in 2026

As agents interact with other agents and external services at scale, identity resolution becomes a real problem.

Multi-agent systems: When an orchestrator agent calls a subagent, it needs to know which subagent it’s calling — and be able to verify the response came from the right one. A handle system makes this addressable.

Agent commerce: Services that want to pay agents for completed work (a growing pattern) need an address to route payment to. Handles serve as that address.

Trust and reputation: Over time, an agent’s handle can accumulate a transaction history and trust record — similar to how a merchant builds payment history. This is emerging infrastructure, but the handle is the anchor it builds on.

Audit trails: When something goes wrong, “which agent did this?” is a question that requires a stable identifier to answer. Raw API keys rotate; handles don’t.

How ATXP Implements Agent Handles

In ATXP, every agent account has:

A unique agent ID — internal identifier used for API calls
A human-readable name — set when the account is created, human-readable but not globally addressable
Agent handle — the fully qualified addressable identity for the agent

When you create an agent account:

response = httpx.post(
    "https://api.atxp.ai/v1/agents",
    headers={"Authorization": f"Bearer {ATXP_API_KEY}"},
    json={
        "name": "research-agent",
        "budget": 10.00,
    }
)

agent = response.json()
print(agent["id"])      # Internal ID: ag_7x9k...
print(agent["handle"])  # Addressable handle: research-agent.{your-workspace}.atxp.ai

The handle is stable. The API key can be rotated without changing the handle or losing the transaction history associated with it.

The Broader Identity Picture

An agent handle is one component of a complete agent identity. Full agent identity includes:

Handle — who the agent is (addressable name)
Credentials — how the agent authenticates (API keys, OAuth tokens)
Permissions — what the agent is authorized to do
Transaction history — what the agent has actually done
Spending limits — what the agent is allowed to spend

Together, these constitute an identity that can be trusted, verified, and controlled. The handle is the anchor point — the thing that everything else attaches to.

For the full picture on agent identity and payments: how to give an AI agent payments and identity.

ATXP provides stable agent handles, isolated credentials, and full transaction history — the complete agent identity layer.