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.

Authentication

No authentication is required. The X-Flashbots-Signature header is accepted but does not affect priority.

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_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

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..."]
  }'