# Make offer (build typed-data)

Endpoint reference for the 1delta API. Index: https://docs.1delta.io/llms.txt · every endpoint: https://docs.1delta.io/llms-full.txt

---

### GET /v1/actions/midnight/make

- operationId: `midnight-make`
- docs: https://docs.1delta.io/1delta-api/midnight-make/
- markdown: https://docs.1delta.io/1delta-api/midnight-make.md
- tags: Midnight

Make offer (build typed-data)

**MAKE — step 1 of 2.** Build the EIP-712 typed-data for a limit offer at your own rate.

**Morpho Midnight is an order-book lender** — liquidity is a book of maker offers, not a pool — so there are two ways to interact:

- **TAKE** (fill existing offers): use the **standard lending actions**, which route to Midnight automatically for a `MORPHO_MIDNIGHT_<id>` market. There is no separate "take" endpoint.
  - **lend** → [`/v1/actions/lending/deposit`](https://docs.1delta.io/1delta-api/lending-deposit/) — fills the **ask** side (supply offers)
  - **borrow** → [`/v1/actions/lending/borrow`](https://docs.1delta.io/1delta-api/lending-borrow/) — fills the **bid** side (demand offers)
  - **repay** / **withdraw** → [`/v1/actions/lending/repay`](https://docs.1delta.io/1delta-api/lending-repay/) · [`/withdraw`](https://docs.1delta.io/1delta-api/lending-withdraw/)
  - Read the live two-sided ladder from [`/v1/data/lending/latest?includeOffers=true`](https://docs.1delta.io/1delta-api/lending-latest/) — each order-book market's loan leg carries `offers` (bids) and `lendOffers` (asks), best-first, with per-level `aprPct`, `assets`, and `cumulativeAssets`.
- **MAKE** (post your own limit offer at a chosen rate): the endpoints in this section (`/v1/actions/midnight/*`) plus [`/v1/data/lending/orders`](https://docs.1delta.io/1delta-api/lending-orders/) to list and cancel them.

**Make flow (worker-assisted signing):**
1. `GET /v1/actions/midnight/make` → returns `typedData`, the echoed `inputs`, and a one-time `authorization` tx.
2. The maker signs `typedData` with their wallet (`wallet.signTypedData`).
3. `POST /v1/actions/midnight/finalize` with `{ inputs, signature }` → the on-chain transaction that publishes the offer to the Midnight mempool.

If `authorization` is present and the maker has **not** yet authorized the ratifier (read `isAuthorized` on-chain), send that one-time `setIsAuthorized` transaction **before** finalizing. The APR you request is snapped to an order-book tick — `aprPctSnapped` is the exact rate the offer will quote.

**Parameters**

| Name | In | Type | Required | Description |
| --- | --- | --- | --- | --- |
| `chainId` | query | string | yes | Chain ID (alias: `chain`). Midnight is Base-only today. See the `ChainId` schema for the full set of supported chains. |
| `lender` | query | string | yes | `MORPHO_MIDNIGHT_<id>` lender key (the market to post into). See the `LenderId` schema for the full set of accepted values. |
| `side` | query | "lend" \| "borrow" | yes | `lend` posts a bid (you lend when taken); `borrow` posts an ask (you borrow when taken). |
| `aprPct` | query | number | yes | Your target APR in percent (alias: `rate`). Snapped to an order-book tick; see `aprPctSnapped` in the response. |
| `size` | query | string | yes | Offer size in loan-token units (integer wei). |
| `expiry` | query | integer | yes | Offer expiry, unix seconds. Must be in the future and ≤ the market maturity. |
| `account` | query | string | yes | Maker (offer owner) address. |

**Response `200`** — Offer typed-data, echoed inputs, and one-time authorization

| Field | Type | Description |
| --- | --- | --- |
| `success` | true |  |
| `data` | object | Everything the frontend needs to sign and publish a maker offer (step 1 of the make flow). `actions` is `null` — the publish transaction is produced by `/finalize` after signing. |
| `data.typedData` | object | EIP-712 typed-data to sign with `wallet.signTypedData` (bigints serialized as strings — sign the response as-is). |
| `data.inputs` | object | 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. |
| `data.inputs.chainId` | string | EVM chain id, as a decimal string. See the `ChainId` schema. |
| `data.inputs.lender` | string | `MORPHO_MIDNIGHT_<id>` lender key. |
| `data.inputs.buy` | boolean | `true` = maker BUYS units (a **lend** offer / bid); `false` = maker SELLS units (a **borrow** offer / ask). |
| `data.inputs.tick` | string | Order-book tick the APR snapped to. |
| `data.inputs.start` | string |  |
| `data.inputs.expiry` | string | Offer expiry, unix seconds. |
| `data.inputs.maxAssets` | string | Maker-side size in loan-token units. |
| `data.inputs.maker` | string | Maker (offer owner) address. |
| `data.authorization` | object | One-time `setIsAuthorized(ecrecoverRatifier, true)` transaction on the Midnight core. Send FIRST, only if the maker has not authorized the ratifier yet (read `isAuthorized` on-chain). |
| `data.authorization.to` | string |  |
| `data.authorization.data` | string | Informational payload. `null` when the endpoint only builds calldata. |
| `data.authorization.value` | string | Native-token value to send with the transaction, in wei. |
| `data.authorization.ratifier` | string |  |
| `data.aprPctSnapped` | number | The exact APR (percent) after tick-snapping — what the offer will actually quote once posted. |
| `data.maturity` | number | Market maturity, unix seconds. |
| `actions` | null |  |

**Example response**

```json
{
  "success": true,
  "data": {
    "typedData": {},
    "inputs": {
      "chainId": "8453",
      "lender": "MORPHO_MIDNIGHT_0xABC…",
      "buy": true,
      "tick": "string",
      "start": "0",
      "expiry": "string",
      "maxAssets": "string",
      "maker": "string"
    },
    "authorization": {
      "to": "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
      "data": "0x617ba037000000000000000000000000c02aaa39b2",
      "value": "1000000000000000000",
      "ratifier": "string"
    },
    "aprPctSnapped": 3.49,
    "maturity": 1
  }
}
```

**Response `400`** — Validation error

**Response `429`** — Rate limited. Unauthenticated callers share a per-IP budget; send an `x-api-key` header to lift it. Retry with exponential backoff.

**Response `500`** — Unexpected server error. Safe to retry with backoff.

**Response `502`** — 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.