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soheimam merged 1 commit into from
Jun 25, 2026
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addressed feedback and linking cdp docs #1664

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7 changes: 4 additions & 3 deletions docs/apps/guides/accept-b20-payments.mdx
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Expand Up @@ -5,13 +5,13 @@ description: "Accept B20 token payments in your app and match each transaction t

B20 is an ERC-20 superset. Standard `transfer`, `transferFrom`, `approve`, `balanceOf`, and ERC-2612 `permit` all work, so an app that accepts ERC-20 tokens accepts B20 with no code changes.

B20's new features include transfer policies, pausing, supply caps, and memos. This guide uses the memo: `transferWithMemo` works like `transfer`, but also attaches a `bytes32` reference such as an order ID and emits a `Memo` event right after the standard `Transfer`. Read that event to tie each payment to an order.
B20's new features include transfer policies, pausing, supply caps, and memos. This guide uses the memo: `transferWithMemo` works like `transfer`, but also attaches a `bytes32` reference such as an order ID and emits a `Memo` event immediately after the standard `Transfer` event. Your app can read that `Memo` event to tie each payment to an order.

## Tag a payment with a memo

This uses your configured viem `walletClient` and `publicClient`. It reads the token's decimals, sends a payment tagged with an order ID, then reads the memo back from the receipt:
This example reads the token's decimals, sends a payment tagged with an order ID, then reads the memo back from the receipt. It uses your configured viem `walletClient` and `publicClient`:

```js
```js pay-with-memo.js lines highlight={22-23,28-29} wrap
import { parseUnits, stringToHex, hexToString, parseEventLogs } from 'viem';

const TOKEN = '0xB200...'; // the B20 token you accept
Expand Down Expand Up @@ -57,4 +57,5 @@ Call `publicClient.simulateContract` with the same arguments before sending. It
## Related pages

- [B20 token standard](/base-chain/specs/upgrades/beryl/b20): the full interface, including memos, policies, pausing, and roles.
- [Query B20 events](https://docs.cdp.coinbase.com/data/sql-api/b20-events): index `Transfer` and `Memo` events with the CDP SQL API to reconcile payments against orders at scale.
- [Launch a B20 Token](/get-started/launch-b20-token): create your own B20 token.
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