# Payments for AI agents, without giving them your keys

Agents are good at preparing payments and bad places to keep money. With send21 an agent creates payment requests and drafts through a scoped API key, and the payment is signed in a wallet the agent does not control.

## Agent proposes, human signs

- The agent calls `create_payment_request` or `create_draft` over [MCP](https://send21.io/docs/mcp), or the same REST endpoints.
- The payer, or the operator, reviews and signs in their own wallet.
- The agent follows the result through `get_draft_status` or a [webhook](https://send21.io/docs/webhooks).
- A leaked key can create instructions but cannot spend anything, because send21 holds nothing.

## Built for automation

- Idempotency keys make retries safe.
- Batch creation of up to 25 drafts per call, and recurring templates.
- Machine-readable pay pages and responses, with your order id echoed in every webhook.
- Discovery files for agents: [/llms.txt](https://send21.io/llms.txt), [/llms-full.txt](https://send21.io/llms-full.txt) and [/openapi.json](https://send21.io/openapi.json).

## Selling to agents

A webshop can let an AI agent complete checkout: the backend creates a payment request per order, the agent picks a currency and pays from its operator's wallet, and the shop marks the order paid on `draft.confirmed`.

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Source: https://send21.io/ai-agent-payments