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Referral Fees & Attribution

What this covers​

How to add partner fees to quotes and intents, and how to append ERC-8021 attribution data to transactions.

When to use this​

Use this when you are embedding Peer inside another app and need revenue sharing, campaign codes, or Base builder attribution.

Configure a referrer fee​

import {
  assertValidReferrerFeeConfig,
  parseReferrerFeeConfig,
} from '@zkp2p/sdk';
import { parseUnits } from 'viem';

const referrerFeeConfig = assertValidReferrerFeeConfig(
  parseReferrerFeeConfig('0x0000000000000000000000000000000000000001', 50),
  'getQuote',
);

const quoteResponse = await client.getQuote({
  paymentPlatforms: ['wise'],
  fiatCurrency: 'USD',
  user: buyerAddress,
  recipient: buyerAddress,
  destinationChainId: 8453,
  destinationToken: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913',
  amount: '100',
  isExactFiat: true,
  referrerFeeConfig,
});

Useful helpers:

  • assertValidReferrerFeeConfig(config, context)
  • isValidReferrerFeeBps(value)
  • parseReferrerFeeConfig(recipient, feeBpsValue)
  • referrerFeeConfigToPreciseUnits(config)

Carry the same fee into signalIntent()​

When a fee is present, use the quote's signalIntentAmount if it is available.

const quote = quoteResponse.responseObject?.quotes?.[0];
if (!quote) {
  throw new Error('No quote found');
}

await client.signalIntent({
  depositId: BigInt(quote.intent.depositId),
  amount: BigInt(quote.signalIntentAmount ?? quote.intent.amount),
  toAddress: buyerAddress,
  processorName: quote.intent.processorName,
  payeeDetails: quote.intent.payeeDetails,
  fiatCurrencyCode: quote.intent.fiatCurrencyCode,
  conversionRate: parseUnits(quote.conversionRate, 18),
  referrerFeeConfig,
  escrowAddress: quote.intent.escrowAddress as `0x${string}` | undefined,
  orchestratorAddress: quote.intent.orchestratorAddress as `0x${string}` | undefined,
});

Add ERC-8021 attribution​

The SDK always appends BASE_BUILDER_CODE last. Your referrer codes go in front of it.

import {
  BASE_BUILDER_CODE,
  ZKP2P_IOS_REFERRER,
  appendAttributionToCalldata,
  encodeWithAttribution,
  getAttributionDataSuffix,
} from '@zkp2p/sdk';

const suffix = getAttributionDataSuffix([ZKP2P_IOS_REFERRER, 'acme-wallet']);
console.log(BASE_BUILDER_CODE, suffix);

const attributedCalldata = encodeWithAttribution(
  {
    abi: escrowAbi,
    functionName: 'addFunds',
    args: [42n, 100_000000n],
  },
  ['acme-wallet'],
);

const existingCalldata = '0x1234' as const;
const campaignCalldata = appendAttributionToCalldata(existingCalldata, 'partner-campaign');

If you are not using SDK write helpers, send the transaction manually:

import { sendTransactionWithAttribution } from '@zkp2p/sdk';

await sendTransactionWithAttribution(
  walletClient,
  {
    address: escrowAddress,
    abi: escrowAbi,
    functionName: 'addFunds',
    args: [42n, 100_000000n],
  },
  ['acme-wallet', 'campaign-q2'],
);

Key points​

  • referrerFeeConfig is for app-level fee sharing; txOverrides.referrer is for ERC-8021 attribution
  • signalIntentAmount is the safest gross amount to pass into signalIntent() when a fee is applied
  • BASE_BUILDER_CODE is always appended automatically and cannot be overridden
  • Mobile apps commonly reuse ZKP2P_IOS_REFERRER or ZKP2P_ANDROID_REFERRER as one of the attribution codes