Blocktime Labs

blocktimelabs.com

Ethereum
Programmable Blocks

We support all the standard endpoints like eth_sendBundle
with replacements & cancellations

Send your bundles to

rpc.blocktimelabs.com

Who We Are

About Blocktime

Blocktime Labs is a next-generation Ethereum block builder redefining what block construction can enable.

We believe the next phase of competition won't be about latency or order flow alone, but about turning the block into
programmable execution infrastructure — unlocking in-block credit, block-time computation and external context, and deterministic execution control.

Builder Technologies

Cutting-edge tools designed for searchers & builders to maximize efficiency.

Intra-Block Loans

Uncollateralized borrowing for the duration of a single block.

Borrow any asset - ERC-20s, ETH, stablecoins, LP tokens, even NFTs - without collateral. Repayment is enforced at the sequencing layer. Unlike flash loans, capital can react to intra-block ordering and state transitions from other transactions in the same block.

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Builder Execution Extension

Heavy computation off-chain, pay gas only for the final execution.

Split logic into preCompute() and execute(output). The builder simulates heavy computation against the exact block state during construction. Ethereum pays only for the final execution - not the exploration. Enables strategies like evaluating thousands of swap paths or aggregating storage reads.

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Builder Execution Oracle

Real-time external data synchronized with block inclusion.

Query external APIs, cross-chain state, and generate secure randomness at the moment of block construction - injected directly into execution. Eliminates the delay and mempool exposure that make strategies stale before they land.

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Deterministic Block Placement

Guarantee exactly where your transaction lands in a block.

Express explicit placement conditions: execute after a specific contract interaction, only if a storage slot changes, or at a precise position. If conditions aren't met, the bundle is excluded. Removes mempool racing and enables deterministic ordering.

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