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

# x402 Micropayments

> Pay per API call with USDC on Base L2 — no subscription required.

For crypto-native agents and developers, Rekko supports **x402** — the HTTP 402 payment protocol. Pay per request with USDC stablecoins on Base L2 instead of subscribing.

## How it works

1. Make a request without an API key
2. Rekko returns `HTTP 402 Payment Required` with a payment envelope
3. Your x402 client automatically pays the USDC amount and retries
4. The response comes back as normal

## Pricing

Per-call pricing matches the [subscription tiers](/pricing):

| Tier     | USDC per call |
| -------- | ------------- |
| LISTING  | \$0.01        |
| INSIGHT  | \$0.10        |
| STRATEGY | \$2.00        |
| DEEP     | \$5.00        |

## Setup

<Steps>
  <Step title="Fund a wallet on Base L2">
    You need a wallet with USDC on [Base](https://base.org) (Coinbase's L2 network). Bridge from Ethereum mainnet or purchase directly.
  </Step>

  <Step title="Install an x402 client">
    Use the `RekkoClient` from the [rekko-skill](https://github.com/Rekko-AI/rekko-skill) repo, or any x402-compatible HTTP client:

    ```bash theme={null}
    pip install httpx "x402[fastapi]" eth-account
    ```
  </Step>

  <Step title="Make requests">
    ```python theme={null}
    from eth_account import Account
    from rekko_tools import RekkoClient

    signer = Account.from_key("0x<your-private-key>")
    async with RekkoClient(signer=signer) as client:
        markets = await client.list_markets()
    ```

    Or set `X402_PRIVATE_KEY` in your environment for auto-detection. Payments are handled automatically per request.
  </Step>
</Steps>

## When to use x402

* **No subscription commitment** — pay only for what you use
* **Agent-native** — autonomous agents can self-fund from a wallet
* **Pseudonymous** — no email signup required
* **Composable** — works alongside other x402-enabled APIs

## When to use a subscription instead

If you make more than \~100 LISTING calls per month, the [Free tier](/pricing) is more cost-effective. For heavy usage, the [Pro plan](/pricing) (\$49/mo) includes thousands of calls.