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

Field	Type	Required	Description
`inputs`	object	yes	Deterministic 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.chainId`	string	no	EVM chain id, as a decimal string. See the `ChainId` schema.
`inputs.lender`	string	no	`MORPHO_MIDNIGHT_<id>` lender key.
`inputs.buy`	boolean	no	`true` = maker BUYS units (a lend offer / bid); `false` = maker SELLS units (a borrow offer / ask).
`inputs.tick`	string	no	Order-book tick the APR snapped to.
`inputs.start`	string	no
`inputs.expiry`	string	no	Offer expiry, unix seconds.
`inputs.maxAssets`	string	no	Maker-side size in loan-token units.
`inputs.maker`	string	no	Maker (offer owner) address.
`signature`	string	yes	Maker signature over `typedData` (0x hex).

Response 200

Field	Type	Description
`success`	`True`
`data`	object	Informational data (quotes, simulation results, etc.)
`actions`	object	Transaction calldata and approvals. Null for quote-only responses (no account provided).
`actions.transactions`	object[]	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[].to`	string	Target contract address
`actions.transactions[].data`	string	Encoded calldata
`actions.transactions[].value`	string	ETH value to send with the transaction
`actions.transactions[].description`	string	Human-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.alternatives`	object[]	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[].to`	string	Target contract address
`actions.alternatives[].data`	string	Encoded calldata
`actions.alternatives[].value`	string	ETH value to send with the transaction
`actions.alternatives[].description`	string	Human-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.permissions`	object[]	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[].to`	string	Target contract address
`actions.permissions[].data`	string	Encoded calldata
`actions.permissions[].value`	string	ETH value
`actions.permissions[].description`	string	Human-readable description of the approval (e.g. "Approve borrow for AAVE_V3", "Approve ERC20")
`actions.permissions[].spender`	string	ERC-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.

Example response

{
  "success": true,
  "data": {},
  "actions": {
    "transactions": [
      {
        "to": "0x87870Bca3F3fD6335C3F4ce8392D69350B4fA4E2",
        "data": "0x617ba037000000000000000000000000c02aaa39b2",
        "value": "0",
        "description": "string"
      }
    ],
    "alternatives": [
      {
        "to": "0x87870Bca3F3fD6335C3F4ce8392D69350B4fA4E2",
        "data": "0x617ba037000000000000000000000000c02aaa39b2",
        "value": "0",
        "description": "string"
      }
    ],
    "permissions": [
      {
        "to": "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
        "data": "0x617ba037000000000000000000000000c02aaa39b2",
        "value": "0",
        "description": "string",
        "spender": "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2"
      }
    ]
  }
}

Request

Responses

The mempool publish transaction (in actions.transactions)

Rate limited. Unauthenticated callers share a per-IP budget; send an x-api-key header to lift it. Retry with exponential backoff.

An upstream data source or protocol origin failed (error.code is ORIGIN_FAILED). error.details carries the per-origin status. This is also what a missing or malformed required parameter currently returns, rather than a 400.

Make offer (finalize + publish)

/v1/actions/midnight/finalize

Request​

Responses​

Request

Responses