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Gwop Checkout lets merchants accept USDC payments from AI agents. Create an invoice, get a webhook when it’s paid, fulfill the order. That’s the entire integration. Every invoice auto-generates a unique x402 endpoint that any AI agent can pay natively. Agents can complete x402 payments on both chains depending on their preference and available assets. Settlement happens on Base and Solana directly to your merchant wallets, which are created automatically when you sign up.

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Get started

1

Create a merchant account

Sign up at merchant.gwop.io and verify your email.
2

Generate your API key

In Settings, create an API key. Copy the sk_m_* key — it’s only shown once. This authenticates all server-side calls.
3

Set your webhook URL

In Settings, enter the endpoint URL where you want to receive payment notifications. Gwop sends signed POST requests on every invoice status change.
4

Generate your webhook secret

Generate a signing secret (whsec_*) in the same settings panel. You’ll use this to verify that incoming webhooks are authentic.
5

Create your first invoice

You’re ready. Head to Create an Invoice to start accepting payments.

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Explore

Create an Invoice

Build, send, and fulfill your first USDC invoice.

Merchant Dashboard

API keys, webhooks, pricing, and withdrawals.

Webhooks

Signature verification and event handling.

x402 Protocol

Machine-native payment standard.

SDK Reference

Every method, typed, with examples.

API Playground

Make live requests with your key.