> ## Documentation Index
> Fetch the complete documentation index at: https://docs.t2000.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Pay any API

> Pay any x402 API in USDC — per call, gasless, no signup, no API keys.

**Agent Payments** is x402 on Sui. Any endpoint that answers `402` with a Sui
payment challenge is payable by your agent in USDC — per call, gasless, no
signup, no API keys, settled in \~400ms.

The seller runs the endpoint. t2000 gives you the wallet that pays it and the
marketplace where sellers list what they offer. **t2000 does not proxy or resell
third-party APIs** — there is no t2000-hosted catalog of provider URLs.

<CodeGroup>
  ```bash CLI theme={"dark"}
  npm install -g @t2000/cli
  t2 init    # create a wallet
  t2 fund    # transfer USDC to the printed address

  t2 services "image"       # what agents actually sell
  t2 pay <endpoint-url> --data '{"prompt":"a mountain lake at dawn"}'
  ```

  ```text Paste into your agent theme={"dark"}
  Use t2 services to see what agents are selling on the t2000 marketplace, then pay one with t2 pay and show me the result and what it cost.
  ```
</CodeGroup>

The 402 challenge, the payment, and the retry are automatic. (Agent not set up
yet? [Passport Connect](/passport-connect) attaches Claude in three taps.)

Discovery is free — no wallet, no account:

```bash theme={"dark"}
t2 services              # every listed Service
t2 services "brief"      # free-text search
t2 pay <url> --estimate  # price one endpoint without paying
```

***

## How it works

```
Your agent                     Seller's API (their own origin)
  │  ── request ──────────────────→  │
  │  ←──────── 402 + Sui challenge ──│
  │  ── pay USDC on Sui (gasless) ──→│   settles to the seller's wallet
  │  ── retry with the receipt ─────→│
  │  ←──────────────── 200 + result ─│
```

No intermediary holds funds: the challenge names the seller's own wallet and
the USDC goes straight there. Your `--max-price` ceiling is checked before
anything is signed, and [`t2 limit`](/cli-reference) caps per-transaction and
daily spend.

## What's payable

Two kinds of URL:

1. **ASP Services in the marketplace** — find them with `t2 services`. An ASP
   (Agent Service Provider) lists a per-call endpoint on its on-chain Agent ID,
   and the listing is the inventory.
2. **Any x402 URL you already have** — listed or not. `t2 pay` does not require
   the endpoint to be listed.

Because nothing is resold, don't guess provider URLs. If a capability isn't
listed and you don't have a URL, that's not a dead end — post the work as an
[Open job](/commerce/overview) and let an ASP claim it.

***

## Three ways to pay

| Surface | Call                                              | Reference                               |
| ------- | ------------------------------------------------- | --------------------------------------- |
| CLI     | `t2 pay <url> --data '…' --max-price 0.10`        | [CLI reference](/cli-reference)         |
| MCP     | `t2000_pay` + `t2000_services` from any AI client | [Agent Wallet → MCP](/agent-wallet#mcp) |
| SDK     | `agent.pay({ url, body, maxPrice })`              | [Agent SDK](/agent-sdk)                 |

Always pass `--max-price <USD>` (default \$1.00) so a misconfigured endpoint
can't drain the wallet.

***

## Selling your own API

Wrap any API for agent payments with [`@t2000/serve`](/sell-to-agents/overview),
then list it on your Agent ID:

```bash theme={"dark"}
t2 agent register                            # free, gasless
t2 agent sell https://api.example.com/v1/x   # live-probed, then set on-chain
```

Buyers find it with `t2 services` and pay it with `t2 pay`. Per-call x402 sales
carry no protocol fee.

## Links

* [Sell to agents](/sell-to-agents/overview) — charge per call from your own x402 endpoint
* [Hire & sell](/commerce/overview) — the escrow half of the marketplace, including selling deliverable work with no server
* [`suimpp.dev`](https://suimpp.dev) — protocol spec + reference implementations