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Make offer (finalize + publish)

POST 
/v1/actions/midnight/finalize

MAKE — step 2 of 2. Ratify the maker's signature and encode the on-chain payload that publishes the offer to the Midnight mempool (where the offer API indexes it).

POST the inputs returned verbatim by /v1/actions/midnight/make together with the maker's signature. The worker rebuilds the identical offer tree from inputs and binds the signature to it — any change to inputs fails ratification on-chain. Returns the single publish transaction in actions.transactions.

Plain-text reference — POST /v1/actions/midnight/finalize

Request body

FieldTypeRequiredDescription
inputsobjectyesDeterministic offer inputs. Returned verbatim by GET /v1/actions/midnight/make; POST them back unchanged to /v1/actions/midnight/finalize alongside the signature so the worker rebuilds the identical offer tree. Any tampering fails on-chain ratification.
inputs.chainIdstringnoEVM chain id, as a decimal string. See the ChainId schema.
inputs.lenderstringnoMORPHO_MIDNIGHT_<id> lender key.
inputs.buybooleannotrue = maker BUYS units (a lend offer / bid); false = maker SELLS units (a borrow offer / ask).
inputs.tickstringnoOrder-book tick the APR snapped to.
inputs.startstringno
inputs.expirystringnoOffer expiry, unix seconds.
inputs.maxAssetsstringnoMaker-side size in loan-token units.
inputs.makerstringnoMaker (offer owner) address.
signaturestringyesMaker signature over typedData (0x hex).

Response 200

FieldTypeDescription
successTrue
dataobjectInformational data (quotes, simulation results, etc.)
actionsobjectTransaction calldata and approvals. Null for quote-only responses (no account provided).
actions.transactionsobject[]Pre-trade setup transactions (e.g. e-mode switch, collateral enable). Execute these before the main swap. Empty when no setup is needed.
actions.transactions[].chainTypeevmWhich VM executes this step. ABSENT means evm, which is the only value any endpoint returns today — every EVM response is unchanged. A non-EVM chain would return a different shape (a serialized, PERISHABLE transaction rather than to/data/value) carrying its own chainType, so a client that wants to stay forward-compatible should branch on this field rather than assume to is present.
actions.transactions[].tostringTarget contract address
actions.transactions[].datastringEncoded calldata
actions.transactions[].valuestringETH value to send with the transaction
actions.transactions[].descriptionstringHuman-readable label. For alternatives, this is the aggregator name (e.g. "Paraswap"). For transactions, describes the setup action (e.g. "Switch e-mode to 1").
actions.alternativesobject[]DEX aggregator swap transactions sorted by best output (descending). Each entry's description is the aggregator name. The client should pick one to execute. Present on loop action endpoints.
actions.alternatives[].chainTypeevmWhich VM executes this step. ABSENT means evm, which is the only value any endpoint returns today — every EVM response is unchanged. A non-EVM chain would return a different shape (a serialized, PERISHABLE transaction rather than to/data/value) carrying its own chainType, so a client that wants to stay forward-compatible should branch on this field rather than assume to is present.
actions.alternatives[].tostringTarget contract address
actions.alternatives[].datastringEncoded calldata
actions.alternatives[].valuestringETH value to send with the transaction
actions.alternatives[].descriptionstringHuman-readable label. For alternatives, this is the aggregator name (e.g. "Paraswap"). For transactions, describes the setup action (e.g. "Switch e-mode to 1").
actions.permissionsobject[]Approval/delegation transactions that must execute before both transactions and alternatives. Includes ERC20 allowances (targeting the composer contract) and lender borrow/withdrawal delegations (targeting the lending protocol contract directly). Filtered against on-chain state so only missing approvals are returned. Null when no approvals are needed.
actions.permissions[].tostringTarget contract address
actions.permissions[].datastringEncoded calldata
actions.permissions[].valuestringETH value
actions.permissions[].descriptionstringHuman-readable description of the approval (e.g. "Approve borrow for AAVE_V3", "Approve ERC20")
actions.permissions[].spenderstringERC-20 approve spender (x-chain permissions). Match it against the selected quote's approvalTarget — several bridges can share one spender, so do not match by description.
actions.permissions[].typeERC20, LenderWhat kind of grant this is. A signatures[] offer names the type it replaces via its replaces field.
actions.signaturesobject[]EIP-712 payloads the user can sign INSTEAD of sending the corresponding permissions entry. Only present when the caller opted in with permit=auto|required and a permit path exists. Sign with eth_signTypedData_v4, then POST the same endpoint with {permits: [{permitId, signature}]} (plus builds where the response issued buildIds) — the permit executes inside the main transaction.
actions.signatures[].permitIdstringOpaque, self-describing handle for this permit. Round-trip it verbatim: POST {permits: [{permitId, signature}]} back to the same endpoint.
actions.signatures[].kinderc2612, dai, permit2, aaveCredit, morphoAuth, cometAuthPermit flavour
actions.signatures[].typedDataobjectReady for eth_signTypedData_v4 (domain, types incl. EIP712Domain, primaryType, message). All numeric fields are decimal strings.
actions.signatures[].replacesstringWhich permissions entry this signature replaces (ERC20 | Lender)
actions.signatures[].spenderstringWho the signature authorises. Match against the permission / quote (approvalTarget) it replaces — on multi-spender responses (x-chain) only routes whose approvalTarget equals this spender are covered by the signature.
actions.signatures[].descriptionstringHuman-readable label for this entry.
actions.signatures[].unscopedbooleanTrue when the grant is NOT amount-scoped (full position control until revoked) — surface this to the user.
actions.signatures[].deadlinestringUnix seconds after which the signature is worthless (default: 30 minutes).
actions.permitSkippedobject[]Why a permit was NOT offered for a permission, when one was asked for (permit=auto|required). The corresponding approve transaction stands.
actions.permitSkipped[].replacesstringWhich permission kind stays a transaction (ERC20 | Lender)
actions.permitSkipped[].reasonstring

Example response

{
  "success": true,
  "data": {},
  "actions": {
    "transactions": [
      {
        "chainType": "evm",
        "to": "0x87870Bca3F3fD6335C3F4ce8392D69350B4fA4E2",
        "data": "0x617ba037000000000000000000000000c02aaa39b2",
        "value": "0",
        "description": "string"
      }
    ],
    "alternatives": [
      {
        "chainType": "evm",
        "to": "0x87870Bca3F3fD6335C3F4ce8392D69350B4fA4E2",
        "data": "0x617ba037000000000000000000000000c02aaa39b2",
        "value": "0",
        "description": "string"
      }
    ],
    "permissions": [
      {
        "to": "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
        "data": "0x617ba037000000000000000000000000c02aaa39b2",
        "value": "0",
        "description": "string",
        "spender": "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
        "type": "ERC20"
      }
    ],
    "signatures": [
      {
        "permitId": "string",
        "kind": "erc2612",
        "typedData": {},
        "replaces": "string",
        "spender": "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
        "description": "string",
        "unscoped": true,
        "deadline": "string"
      }
    ],
    "permitSkipped": [
      {
        "replaces": "string",
        "reason": "string"
      }
    ]
  }
}

Request​

Responses​

The mempool publish transaction (in actions.transactions)