Private transaction routing for BNB Smart Chain.

Sandwiching requires seeing a transaction while it is still pending. Here nobody does. What we do instead is backrun: our own trade executes after yours, closing the price gap your swap opened. It cannot affect your price — your swap has already executed when ours runs — which is why protecting you and earning from your flow are the same job rather than opposing ones.

A sandwich is the opposite trade: a bot buys in front of you so you pay more, then sells behind you. That needs your transaction to sit in the public mempool long enough to be seen and outbid. Routing privately removes the opportunity rather than competing for it.

curl -s https://rpc.backrunshield.com \
  -H 'content-type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,
       "method":"eth_chainId","params":[]}'

{"jsonrpc":"2.0","id":1,"result":"0x38"}

What the endpoint serves

600 requests per minute per IP · 128 KB per request body · /health returns the live configuration · /stats the public numbers · /bench the endpoint measurements.

For each transaction you send us, we record its hash and your address. If one of our trips lands behind it in the same block, we read what that trip realized from the receipt's own logs — the tokens our contract actually received, minus the gas it burned — and your share is a percentage of that figure.

your share = (tokens our trip received − gas it paid) × 50 %

# 80 % above volume. Paid in BNB, daily, from a named address.
# Every line names your transaction hash, ours, and the amount.

Nothing is estimated and nothing is averaged: if a backrun did not land, it earned nothing and is not counted. Transactions we cannot backrun are still routed privately at no cost to you — the protection is not conditional on us making money.

We declare this as tracking: limited wherever this endpoint is listed, rather than claiming to store nothing while keeping rows. The rows exist for one reason: to build the backrun and to know who to pay.

How do you make money if this is free?

By backrunning — trading behind your transaction to close the price gap it opens. That is a normal, public activity on every chain; the difference here is that we share it with you instead of keeping all of it, and we never take the other side that would cost you money.

Can you see or move my funds?

No. Your wallet signs locally and sends us the finished bytes. We cannot alter, replace or spend anything — only forward it or, in the worst case, fail to forward it, in which case we broadcast it publicly.

Is it slower than a public RPC?

Sending is not: the transaction reaches a builder in milliseconds. Inclusion depends on a builder taking it, and if none does within two blocks we broadcast publicly — so the worst case is roughly a second later than the public mempool, and the normal case is the same block.

What happens if your endpoint goes down?

Your wallet errors like any RPC outage and you switch networks. Nothing is stuck on our side: a transaction we have already accepted is broadcast publicly within two blocks if no builder takes it.

Do I need to trust you not to front-run me?

Less than it sounds. Our trips are on chain; anyone can read the blocks and see our transactions sitting behind the triggers, never ahead of them. The moment that stopped being true, it would be public within a day.

Does this work for contract deployments and approvals?

Yes — any signed transaction is routed the same way, whether it is a swap, an approval, a transfer or a deployment. Only swaps tend to create a backrun, so only they tend to earn a rebate.

Who runs this?

An independent searcher on BNB Smart Chain, with its own full node and executor contract in Tokyo — in the same facility as the builders we submit to. Not affiliated with BNB Chain, PancakeSwap, 48Club or BlockRazor.

Send us your users' flow, keep most of what it earns.

Two builders produce more than 96 % of BNB Chain blocks, and they run their own arbitrage inside the blocks they build. In one 24-hour measurement of gaps we could have taken, 891 went to builder-owned contracts and 1,016 to private 0.05-gwei bundles before anyone else had a chance. That value comes out of your users' trades, and today none of it returns to you.

Route your users here and we split what their flow earns — 50 % from the first day, up to 80 % above volume — paid in BNB, daily, from an address you can watch. No exclusivity, no minimum, cancel whenever.

Before either side commits: send your router address and we will measure what its flow was worth over a day, from our own node, and show you the working.