POST /v1/pimlico/sponsor - Ostium

Gasless SDK modes use a Pimlico-compatible bundler/paymaster endpoint by default. Mainnet:

https://builder.prod.bedrock.ostium.io/v1/pimlico/sponsor?chainId=42161

Testnet:

https://builder.prod.bedrock.ostium.io/v1/pimlico/sponsor?chainId=421614

SDK usage

The default is applied when you create a gasless client without a custom pimlicoUrl.

const client = await OstiumClient.createDelegatedAndGasless({
  delegatePrivateKey: process.env.DELEGATE_PRIVATE_KEY as `0x${string}`,
  traderAddress: '0xTraderAddress',
});

Override it when you want to use a different ERC-4337 bundler/paymaster endpoint.

const client = await OstiumClient.createSelfAndGasless({
  traderPrivateKey: process.env.TRADER_PRIVATE_KEY as `0x${string}`,
  pimlicoUrl: 'https://your-bundler.example.com',
});

This endpoint is used internally by the SDK submitter for gasless UserOperations. Non-gasless modes do not call it.