Block 0 lane

Most lanes send a transaction the moment you ask, wherever the leader is. The block 0 lane waits for the right leader. Solana hands the block to a new leader every 4 slots, and those leaders sit all over the world. When the current leader is close to our region and its slot has just started, a copy sent now reaches it before it seals the block, and lands in the slot it was sent for: block 0. When the leader is far away, the copy would arrive late, so the lane does not send it at all.

What it does in a race

The block 0 lane is one more copy in a Lightspeed race, next to the SWQoS lanes. It does not replace them.

Leader near: the copy goes out the instant the slot starts and is usually first. About three in four copies that go out land in the slot they were sent for.
Leader far: the copy is held back. It never reaches the network and costs nothing; its signature in the response simply never confirms. The other lanes carry the trade as usual.

About a quarter of copies go out. When one does, it is the fastest way onto the chain we have; when one doesn't, you lose nothing. The one-fill rule holds as everywhere: only the first copy to land trades, every other copy fails before it moves funds.

Use it

Add block0 to providers:

const res = await fetch("https://sol.shrine.trade/api/lightspeed", {
  method: "POST",
  headers: { "content-type": "application/json", "x-api-key": "<your Lightspeed api key>" },
  body: JSON.stringify({
    action: "buy",
    mint: "<token mint>",
    amount: 0.5,
    slippage: 25,
    priorityFee: 0.002,
    tip: 0.001,
    providers: ["shrine", "temporal", "block0"], // or ["all"]: block0 is in it on Developer
  }),
});

In the response, a held copy shows as accepted with a signature like every other; check the landed signature, not the list of acceptances.

Where it helps most

Snipes and arbitrage, where landing a slot earlier is the whole game and a copy that never goes out costs nothing. Run your bot in the same region as the API (or on a private link) so the request reaches the race while the slot is still young.

Measured, not promised

The shares above are measured on live Frankfurt traffic in October 2026. They move with the leader schedule: a run of leaders near the region means more copies go out.

What it does in a race​

Use it​

What it does in a race

Use it