Bid Structure

The bid payload sent to the internal mev-commit API is as follows:

Key	Description
`txHashes`	Array of transaction hashes as strings
`amount`	Bid amount in wei
`blockNumber`	L1 block number targeted for bid inclusion
`decayStartTimestamp`	Start timestamp for bid decay (in Unix milliseconds)
`decayEndTimestamp`	End timestamp for bid decay (in Unix milliseconds)
`revertingTxHashes`	Array of transaction hashes as strings that can revert
`rawTransactions`	Array of raw signed transaction payloads
`slashAmount`	Amount to be slashed from provider stake in case of a failed bid
`bidOptions`	One or more of the available options

Only one out of the txHashes or rawTransactions need to be provided in the bid. If the rawTransactions is given, the txHashes are inferred from it.

Example bid

{
    "txHashes": ["0549fc7c57fffbdbfb2cf9d5e0de165fc68dadb5c27c42fdad0bdf506f4eacae", "0549fc7c57fffbdbfb2cf9d5e0de165fc68dadb5c27c42fdad0bdf506f4eacaf","0549fc7c57fffbdbfb2cf9d5e0de165fc68dadb5c27c42fdad0bdf506f4effff"],
    "amount": "100040",
    "blockNumber": 133459,
    "decayStartTimestamp": 1716935571901,
    "decayEndTimestamp": 1716935572901,
    "revertingTxHashes": ["22145ba31366d29a893ae3ffbc95c36c06e8819a289ac588594c9512d0a99810"]
}

Example bid with raw transaction payloads

{
    "rawTransactions": ["0x02f8db82426882010c8410433624841043362f8303425094ea593b730d745fb5fe01b6d20e6603915252c6bf87016e03ce313800b864ce0b63ce0000000000000000000000000e94804eaa3c4c5355992086647f683f6f41ef1f000000000000000000000000000000000000000000000000000150e0786cc000000000000000000000000000000000000000000000000000000000000004e378c001a0ece6d13b20247abdc07d669c9186ee5a1ac9601db8c98a3323024ab299cb6662a01c20680efe4e0bb48a3a936b5ab27c741819f0ac567b12b34b230004b20b78a0", "0x02f8748242682c841043362684104336318252089412b141665da4a5f617c759ad996ef91ad806a9c0880de0b6b3a764000080c001a0806552ed846808580eb896994825f07e73de2f42e2d3554f228284ecfaa89d9ca046d58b62ba565982fb07a64b436dd7a6c210b2f59c4fb2aee2cdd150ccf8bfaa"],
    "amount": "100040",
    "blockNumber": 133459,
    "decayStartTimestamp": 1716935571901,
    "decayEndTimestamp": 1716935572901,
    "revertingTxHashes": ["22145ba31366d29a893ae3ffbc95c36c06e8819a289ac588594c9512d0a99810"]
}

The final bid structure includes a hash and signature that is auto-constructed by your mev-commit bidder node and looks as follows.

{
   "txHash":"0549fc7c57fffbdbfb2cf9d5e0de165fc68dadb5c27c42fdad0bdf506f4eacae,0549fc7c57fffbdbfb2cf9d5e0de165fc68dadb5c27c42fdad0bdf506f4eacaf,0549fc7c57fffbdbfb2cf9d5e0de165fc68dadb5c27c42fdad0bdf506f4effff",
   "bidAmount":277610,
   "revertingTxHashes":"22145ba31366d29a893ae3ffbc95c36c06e8819a289ac588594c9512d0a99810",
   "blockNumber":2703,
   "digest":"uU2p20f5KmehWqpuY1u+CbhcS8jNwdQAJQe2dh0Vnrk=",
   "signature":"nY6jYsGPxj6LVlSVQJbZcxvmRrw8Ym5rqOL1x0W/xPlJGBaF/ZzzjkxiioY/MDiRGvlflSWeoT0fh3aIJiJxAhw=",
   "decayStartTimestamp":1716935571901,
   "decayEndTimestamp": 1716935572901,
   "slashAmt":0,
   "rawTransactions":["0x02f8db82426882010c8410433624841043362f8303425094ea593b730d745fb5fe01b6d20e6603915252c6bf87016e03ce313800b864ce0b63ce0000000000000000000000000e94804eaa3c4c5355992086647f683f6f41ef1f000000000000000000000000000000000000000000000000000150e0786cc000000000000000000000000000000000000000000000000000000000000004e378c001a0ece6d13b20247abdc07d669c9186ee5a1ac9601db8c98a3323024ab299cb6662a01c20680efe4e0bb48a3a936b5ab27c741819f0ac567b12b34b230004b20b78a0"],
   "nikePublicKey": "04c631d017981efdc0c319b475de36389a10ede86fbbc9adcf573844a858ce8ddcddb41306eb9c34ec4ee9bc0234f7e30684bf389142437166d407e47974d5cbf7"
}

Details on Bid Structure

Property	Description
txnHash	Array of transaction hashes represented as strings
bidAmount	Amount to bid in wei
blockNumber	L1 target block to have bid included
decayStartTimestamp	Start timestamp for bid decay (in Unix milliseconds)
decayEndTimestamp	End timestamp for bid decay (in Unix milliseconds)
bidDigest	Hash of the bid
bidSignature	Signed bidВigest = sign(bidDigest, signingKey)
nikePublicKey	NIKE public key of the bidder, autogenerated for each bid
revertingTxHashes	Array of transaction hashes as strings that can revert
rawTransactions	Array of hexadecimal encoded raw signed transaction payloads
slashAmount	Amount to be slashed from provider stake (and directly transferred to the bidder) in case of a failed bid
bidOptions	Position constraints or other available options

Details on Decay Parameters

The decayStartTimestamp and decayEndTimestamp parameters allow bidders to control the range over which their bid decays. Due to inherent network delays, preconfirmation times can range between 50 to 250 milliseconds even if providers commit immediately after seeing the bid. To account for this, you might want to set your decayStartTimestamp approximately 300 milliseconds in the future. However, setting this delay is not mandatory and should be adjusted based on your strategic preferences for bid timing and pricing. For more detailed information about the decay mechanism, refer to the Bid Decay Page.

Details on BidOptions

The bidOptions provides a way to put certain constraints on the transaction with respect to the block. Currently we have the position constraint option. This option allows users to configure the location of the transaction in the block. This could be an absolute index or percentile or gas percentile index of the block.

message PositionConstraint {
  option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_schema) = {
    json_schema: {
      title: "Position Constraint"
      description: "Constraint on the position of the transaction in the block."
    }
  };
  enum Anchor {
    ANCHOR_UNSPECIFIED = 0;
    ANCHOR_TOP = 1; // Position is at the top of the block
    ANCHOR_BOTTOM = 2; // Position is at the bottom of the block
  }
  enum Basis {
    BASIS_UNSPECIFIED = 0;
    BASIS_PERCENTILE = 1; // Position is a percentile of the block size
    BASIS_ABSOLUTE = 2; // Position is an absolute position in the block
    BASIS_GAS_PERCENTILE = 3; // Position is a percentile of the gas used in the block
  }
  Anchor anchor = 1 [(grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
    description: "Anchor position of the transaction in the block."
  }];
  Basis basis = 2 [(grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
    description: "Basis for the position constraint."
  }];
  int32 value = 3 [(grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
    description: "Value of the position constraint. If anchor is TOP, this is the position from the top of the block. If anchor is BOTTOM, this is the position from the bottom of the block."
  }];
};

For example,

{
    anchor: ANCHOR_TOP,
    basis: BASIS_PERCENTILE,
    value: 10
}

would let the provider know that this transaction or bundle has to be in the top 10% of the block. If we get a commitment and the transaction is not in the top 10%, the provider will be slashed. Multiple constraints can be combined, in which case the transaction needs to satisfy all of them. In case of transaction bundles, a set of constraints is considered satisfied if each constraint is satisfied by at least one transaction in the bundle.

Details on Encrypted Bid Structure

The bid structure is encrypted using an AES key, which the bidder P2P node generates at the start, and is then sent to the provider.

{
    "ciphertext": "5750d8af6296296f1147f5e11f47f253f376dea3fd5c2760cd82bd82a7066a8fe1c84f48a4e738d1df7c0e64f930c6b0b642800156e453a501c8b993951fcb50fe0b9fce4a2046838f499317a6018eb59abd5e84dbe3b7e296d4e0e70ef3bb221af7afe341908dbd02e8c91b4eff935b2697208f51ccacf5fe744c199afca687d85850a2e12a75433510dccda9258612348c586e971cc521486806ea25ec94d5fa7038beda3f532970e7b06198deef96677af3a6889c84d657585a9eefd224961f87a3353ad4ede4a7368e2e5bc9571d320a8a3be0f1e08e769f9bb2da6fb76c81cd"
}

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Details on Bid Structure

Details on Decay Parameters

Details on BidOptions

Details on Encrypted Bid Structure

​Details on Bid Structure

​Details on Decay Parameters

​Details on BidOptions

​Details on Encrypted Bid Structure

Details on Bid Structure

Details on Decay Parameters

Details on BidOptions

Details on Encrypted Bid Structure