Guides
Onchain Seller and Buyer Flow
Use OpenPermit policy with non-custodial onchain payment execution.
OpenPermit supports resource-configured evmStablecoin flows where the seller stores onchain defaults and the buyer submits the transaction.
Store paymentConfig.onchain with chain, payTo, and optional contract/token overrides.
The seller middleware emits an onchain payment challenge for the resource.
The SDK asks OpenPermit for a transaction plan, broadcasts with caller-provided clients, and submits settlement.
The SDK returns retry headers including OPENPERMIT-INTENT-ID and OPENPERMIT-ONCHAIN-SETTLEMENT.
import { executeOnchainSellerChallenge } from '@openpermit/sdk/buyer';
const result = await executeOnchainSellerChallenge({
client: openpermit,
mandateId: 'mandate_...',
challenge,
walletClient,
publicClient,
});OpenPermit remains non-custodial in this flow. Your app owns wallet connection and transaction submission.