Chains API

Which Solana validator will produce each upcoming slot

The validator scheduled to lead each slot from now (or a chosen slot) through the end of the next epoch, with the current slot and epoch bounds.

GET/api/external/chain-analysis/leader-schedule/{chain}

Get a free API key Try it in the API reference

What it returns

The validator scheduled to produce each of up to limit consecutive slots from startSlot (default: the current slot), with where the chain is now. Solana decides its leader schedule a full epoch ahead, so slots are answerable from the first slot of the current epoch through the last slot of the next one (scheduledThroughSlot); a startSlot outside that window returns 400. A page that would run past scheduledThroughSlot stops there. Slots at or below currentSlot are already past: their leader was scheduled, which does not mean it produced a block. A validator leads 4 consecutive slots at a time.

Chains

Solana SOL

Request

Send your key in the x-dex-data-key header. Replace each <placeholder> with a real value.

curl -H "x-dex-data-key: $DEXDATA_API_KEY" \
  "https://api.dexdata.io/api/external/chain-analysis/leader-schedule/SOL"

Parameters
Parameter	Description
`startSlot` query · integer · optional	The first slot to answer (inclusive). Defaults to the current slot.
`limit` query · integer · optional	How many consecutive slots to answer: 1 to 1000. Defaults to 100. limit ≤ 400 keeps the answer under 32 KB.
`chain` path · string · required	SOL only; every other chain returns 400. Solana fixes, a full epoch ahead, which validator produces each slot — a schedule other chains do not publish.

Response fields

A JSON response. Every field is always present; null means the value could not be established, never zero.

Response fields of Which Solana validator will produce each upcoming slot
Field	Type	Description
`currentSlot`	integer	The newest confirmed slot when this was answered.
`epoch`	integer	The epoch `currentSlot` is in.
`epochStartSlot`	integer	The first slot of that epoch.
`epochEndSlot`	integer	The last slot of that epoch.
`scheduledThroughSlot`	integer	The last slot whose leader is decided: the end of the next epoch.
`startSlot`	integer	The first slot on this page.
`endSlot`	integer	The last slot on this page; short of `startSlot + limit - 1` only when the page reached `scheduledThroughSlot`.
`leaders`	object[]	One entry per slot from `startSlot` to `endSlot`, ascending.
`leaders[].slot`	integer
`leaders[].identity`	string	The scheduled validator's identity address.

Price per call

Solana: 5 credits

Charged only when the call succeeds. Prices as of 2026-10-30; the current ones are always in the API reference.

Which Solana slots produced a block, and which were skipped
Which scheduled slots actually produced a block, and which leaders skipped theirs.
Solana protocol parameters: network, epochs, inflation, minimum stake, rent
The epoch length and schedule offset that bound which slots have a leader yet.
Solana validators: stake, commission, voting and blocks produced
The schedule names identities; this says whose they are, how much stake and whether they vote.
What it costs to land a Solana transaction right now
The base fee per signature in lamports, and the priority fee per compute unit in micro-lamports at the 25th, 50th, 75th and 95th percentiles of the last 150 slots. SOL only.
The newest validator withdrawals on Ethereum
The newest beacon-chain withdrawals credited on Ethereum (validator, receiver, amount, block) and the total number processed so far.
A block's validator withdrawals
The beacon-chain withdrawals one named Ethereum block paid out: which validators, to which addresses and how much. An empty list for a block that paid none, null for a block that does not exist.

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