What Is the Agent Transaction Protocol? | ATXP
The Agent Transaction Protocol (ATXP) is an infrastructure layer that gives AI agents an account — bundling identity, payments, email, and tool access into one. Developers install it with npx atxp. Agents can self-register, select tools autonomously, and access 14+ capabilities without managing API keys or subscriptions.
Why ATXP Exists
Every AI model ships with impressive capabilities and the same structural problem: it has no account.
The model can generate images, write code, browse the web, and send emails — but only if someone has already signed up for an image API, a code execution environment, a browser API, and an email service. And paid for all of them. With separate API keys. From separate providers. On separate billing cycles.
ATXP exists because this problem is not incidental — it’s structural. The internet was built for humans, and every service on it assumes a human will sign up, verify an email, enter a credit card, and manage credentials. AI agents cannot do any of those things natively.
ATXP is the account layer designed for agents instead of humans.
What ATXP Provides
A single npx atxp command provisions a complete agent account:
| Component | What You Get | Why It Matters |
|---|---|---|
| Agent handle | A unique, persistent identifier | The agent has a name it keeps across sessions |
| IOU tokens | 10 starter credits, top-up as needed | The agent can pay for tool calls immediately |
| @atxp.email address | A real email address tied to the agent | The agent can send and receive email autonomously |
| 14+ tools | LLM inference, image gen, search, browse, storage, video, music, code execution, and more | The agent has capabilities without API key management |
| LLM gateway | Unified access to Claude, GPT-4, Gemini, Llama, and others | Switch models without re-engineering |
How ATXP Works
ATXP operates on a pay-as-you-go model. There are no subscriptions, no monthly minimums, and no pre-negotiated API agreements:
- Install —
npx atxpcreates an account and provisions all components - Fund — The account starts with 10 IOU tokens (free starter credits); top up as needed
- Call tools — Each tool call deducts from the IOU token balance at cost
- Use any model — The LLM gateway routes to the best available model; new models appear automatically
New capabilities are added to the platform as they become available. An agent that already has an ATXP account automatically gains access to new tools without re-registration or new API keys.
ATXP’s Position in the Stack
ATXP is infrastructure, not an application. It sits below the agent framework (LangChain, CrewAI, Claude Code, OpenAI Agents SDK) and above the individual capability providers (Anthropic, OpenAI, Stability AI, etc.):
Your Agent / Agent Framework
↓
ATXP Account
(identity + payments + tools)
↓
Capability Providers
(Anthropic, OpenAI, Stability, etc.)The agent interacts with ATXP. ATXP handles the vendor relationships, API key management, billing, and routing. The agent sees one unified interface.
Get started: npx atxp
Frequently Asked Questions
What is the Agent Transaction Protocol?
The Agent Transaction Protocol (ATXP) is infrastructure that provides AI agents with a complete account — including a persistent identity, payment capability, email address, and access to 14+ tools. One command (npx atxp) provisions all of it. No API keys, no subscriptions, no separate signups.
What does ATXP cost?
Account creation is free. You pay only for what your agent actually uses — each tool call (image generation, LLM inference, web search, etc.) deducts from your IOU token balance at cost. There are no monthly fees or minimum commitments.
Can any AI agent use ATXP?
ATXP is framework-agnostic. It works with LangChain, CrewAI, Claude Code, the OpenAI Agents SDK, AutoGen, and any other agent framework that can make HTTP calls. The ATXP SDK provides convenience wrappers; the underlying protocol is REST.