Alto Bundler Reference
This is a reference guide page, describing only the technical specification for the Bundler. Please see the Bundler overview page for the full collection of documentation, including tutorials, how-to guides, and conceptual guides for the Bundler.
Use our standard api endpoint to send bundler-specific calls to is at https://api.pimlico.io/v1/{chain}/rpc?apikey=YOUR_API_KEY_HEREto call the bundler endpoint if you have an API key. If you need an API key, follow the Quick Start guide to get one.
Our bundler is currently live on the following networks:
| Chain | Mainnet | Testnet |
|---|---|---|
| Ethereum | ✅ (ethereum) | ✅ (sepolia) ✅ (goerli) |
| Arbitrum | ✅ (arbitrum) | ✅ (arbitrum-goerli) |
| Polygon | ✅ (polygon) | ✅ (mumbai) |
| Optimism | ✅ (optimism) | ✅ (optimism-goerli) |
| Gnosis | ✅ (gnosis) | ✅ (chiado-testnet) |
| Linea | ✅ (linea) | ✅ (linea-testnet) |
| Base | ✅ (base) | ✅ (base-goerli) |
| Avalanche C-Chain | ✅ (avalanche) | ✅ (avalanche-fuji) |
| Scroll | ✅ (scroll) | ✅ (scroll-alpha-testnet) ✅ (scroll-sepolia-testnet) |
| Celo | ✅ (celo) | ✅ (celo-alfajores-testnet) |
| BSC | ✅ (binance) | |
| DFK Chain | ✅ (dfk-chain) | ✅ (dfk-chain-test) |
| Klaytn | ✅ (klaytn-cypress) | |
| Xai Orbit | ✅ (xai-goerli-orbit) | |
| Nautilus | ✅ (nautilus) | |
| opBNB | ✅ (opbnb) |
For more on the bundler methods, see the ERC-4337 (opens in a new tab) specification.