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metachris merged 1 commit into from
Feb 2, 2026
Merged

Update api.mdx: fix outdated bundle hash info #76

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23 changes: 3 additions & 20 deletions docs/api.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -148,28 +148,11 @@ The example code supports requiring a specific TLS certificate as well as skippi

#### Bundle Hash<!-- omit in toc -->

The bundle hash is a unique identifier for a specific bundle of transactions sent to BuilderNet.
"bundle hash" is a unique identifier for a specific bundle of transactions sent to BuilderNet. It is returned as response of the `eth_sendBundle` RPC call.

It is calculated by taking the Keccak-256 hash of the transactions in a bundle:
You can use this hash to look up refunds for a specific bundle by using the [buildernet_getFeeRefundsByBundle](#buildernet_getfeerefundsbybundle) API.

```go
// Compute keccak hash over the bundle transactions
hasher := sha3.NewLegacyKeccak256()
for _, rawTx := range b.Txs {
var tx types.Transaction
if err := tx.UnmarshalBinary(rawTx); err != nil {
return common.Hash{}, uuid.Nil, err
}
hasher.Write(tx.Hash().Bytes())
}
hashBytes := hasher.Sum(nil)
```

References:
- [Golang reference implementation](https://github.com/flashbots/go-utils/blob/6530a1a3fb4995730b0beac14d811b51e08a52ca/rpctypes/types.go#L224-L233)
- [Examples and test suite](https://github.com/flashbots/go-utils/blob/6530a1a3fb4995730b0beac14d811b51e08a52ca/rpctypes/types_test.go#L27)

You can look up refunds for a specific bundle by using the [buildernet_getFeeRefundsByBundle](#buildernet_getfeerefundsbybundle) API.
See the [reference implementation in FlowProxy](https://github.com/BuilderNet/FlowProxy/blob/07c4e33af664098a29be45807e8d9f0a48b85749/src/primitives/mod.rs#L95). Note that the implementation may change over time, and we recommend to use the hash returned by the `eth_sendBundle` RPC call directly.

---

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