Getting Started
Bombora is an Ethereum block builder by Sigma Prime. Submit bundles and private Ethereum transactions via the JSON-RPC endpoint.
Use Bombora when you need direct builder submission, private transaction inclusion, or ordered bundle execution on Ethereum Mainnet.
Coinbase
Ethereum Mainnet blocks built by Bombora use the following coinbase address:
Endpoints
| Network | Region | Endpoint |
|---|---|---|
| Ethereum Mainnet | Global | https://rpc.bombora.build |
| Ethereum Mainnet | EU | https://eu-rpc.bombora.build |
| Ethereum Mainnet | US | https://us-rpc.bombora.build |
Global endpoints route to the nearest available region.
bombora_getBundleStats is served from its own host:
Authentication
Most methods require no authentication, and the X-Flashbots-Signature header does not affect priority. eth_sendEndOfBlockBundle requires a valid signature. See Authentication for how to sign requests.
Privacy
Bundles and private transactions submitted to Bombora are not broadcast to the public mempool.
Supported Methods
| Method | Description |
|---|---|
eth_sendBundle | Submit an ordered bundle with explicit revert/drop controls |
eth_cancelBundle | Cancel a pending bundle via its replacement UUID |
eth_sendEndOfBlockBundle | Submit an end-of-block bundle targeting specific pools |
eth_sendRawTransaction | Submit a single private transaction (raw) |
eth_sendPrivateTransaction | Submit a private transaction with a block number ceiling |
eth_cancelPrivateTransaction | Cancel a pending private transaction |
bombora_getBundleStats | Check the status of a previously submitted bundle |
PropAMMs
Bombora supports conditional priority updates for proprietary AMMs.
Makers stream single-block updates over an authenticated WebSocket. Searchers, solvers, and aggregators continue to submit taker routes through the normal bundle API and can optionally consume a public state-override stream.