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:

0x85C2E985A4fb5c3fF25eE27Ee424abd851E4cB33Click to copy

Endpoints

Network	Region	Endpoint
Ethereum Mainnet	Global	`https://rpc.bombora.build`
Ethereum Mainnet	EU	`https://eu-rpc.bombora.build`

More regions coming soon. Global endpoints route to the nearest available region.

bombora_getBundleStats is served from its own host:

https://stats.bombora.buildClick to copy

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

Quick Example

curl -X POST https://rpc.bombora.build \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "eth_sendRawTransaction",
    "params": ["0x...signed-tx-bytes..."]
  }'