> ## Documentation Index > Fetch the complete documentation index at: https://v3.docs.derive.xyz/llms.txt > Use this file to discover all available pages before exploring further. # Preview an order's EIP-712 signing data > Takes the same params as private/order and rebuilds the order Action without executing anything, returning the EIP-712 encoded_data, encoded_data_hashed, action_hash, typed_data_hash, domain_separator, action_typehash, module, owner and expected_signer, plus the decoded order action data. Byte-compare these against your local computation to find why a signature is rejected. Requires a logged-in session; no trade scope needed. ## OpenAPI ````yaml /openapi.json post /private/order_debug openapi: 3.1.0 info: title: Derive v3 API version: 0.2.0 description: JSON-RPC 2.0 methods, served over WebSocket and HTTP POST. servers: - url: https://api.derive.xyz/v3 description: Production (HTTP POST base) - url: https://testnet.api.derive.xyz/v3 description: Testnet (HTTP POST base) security: [] tags: - name: Subaccounts description: >- List, inspect, and label subaccounts, portfolios, positions, and collateral. - name: Session Keys description: Register, edit, and list delegated signing keys. - name: Account description: Wallet-level account information and settings. - name: Orderbook description: Place, replace, cancel, and query orders, trigger orders, and algos. - name: RFQ description: 'Request-for-quote: send RFQs, quote, and execute block trades.' - name: Vault Shareholders description: >- Deposit into and withdraw from vaults, and track shares, requests, and performance. - name: Vault Curators description: >- Create and operate curated vaults: settle deposit and withdrawal requests, and manage vault metadata. - name: History description: >- Per-account historical records: orders, trades, transfers, and settlements. - name: Market Maker Protection description: Configure, read, and reset market-maker protection. - name: Transfers & Withdrawals description: Move collateral between subaccounts, to other wallets, and on-chain. - name: System description: Rate limits and transaction lookups. - name: Market Data description: Instruments, currencies, tickers, and market-wide feeds. - name: Referrals description: Referral codes and program performance. - name: Other description: Uncategorized. paths: /private/order_debug: post: tags: - Orderbook summary: Preview an order's EIP-712 signing data description: >- Takes the same params as private/order and rebuilds the order Action without executing anything, returning the EIP-712 encoded_data, encoded_data_hashed, action_hash, typed_data_hash, domain_separator, action_typehash, module, owner and expected_signer, plus the decoded order action data. Byte-compare these against your local computation to find why a signature is rejected. Requires a logged-in session; no trade scope needed. operationId: private_order_debug requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/CreateOrderRequest' responses: '200': description: Success content: application/json: schema: $ref: '#/components/schemas/OrderDebugResponse' default: description: JSON-RPC error (see Error Codes) components: schemas: CreateOrderRequest: description: '`private/order` params.' type: object required: - amount - direction - instrument_name - limit_price - max_fee - nonce - signature - signature_expiry_sec - signer - subaccount_id properties: algo_duration_sec: default: null type: - integer - 'null' format: int32 algo_num_slices: default: null type: - integer - 'null' format: int32 algo_type: default: null anyOf: - $ref: '#/components/schemas/AlgoType' - type: 'null' amount: description: >- Order amount in units of the base, as a decimal string (e.g. `"1.5"`) or a JSON number. type: string format: decimal client: default: null type: - string - 'null' direction: $ref: '#/components/schemas/Direction' extra_fee: description: >- Optional extra fee per unit of volume, as a decimal string or JSON number. Defaults to zero. default: null type: - string - 'null' format: decimal instrument_name: type: string is_atomic_signing: default: null type: - boolean - 'null' label: default: null type: - string - 'null' limit_price: description: >- Limit price in quote currency, as a decimal string (e.g. `"3100.5"`) or a JSON number. type: string format: decimal max_fee: description: >- Max fee per unit of volume in quote currency, as a decimal string or a JSON number. type: string format: decimal mmp: default: null type: - boolean - 'null' nonce: type: string order_type: $ref: '#/components/schemas/OrderType' default: limit reduce_only: default: null type: - boolean - 'null' referral_code: default: null type: - string - 'null' reject_post_only: default: null type: - boolean - 'null' reject_timestamp: default: null type: - integer - 'null' format: int64 signature: type: string signature_expiry_sec: type: integer format: int64 signer: type: string subaccount_id: type: integer format: int64 time_in_force: $ref: '#/components/schemas/TimeInForce' default: gtc trigger_price: description: >- Trigger price as a decimal string or JSON number; omit for non-trigger orders. default: null type: - string - 'null' format: decimal trigger_price_type: default: null anyOf: - $ref: '#/components/schemas/TriggerPriceType' - type: 'null' trigger_type: default: null anyOf: - $ref: '#/components/schemas/TriggerType' - type: 'null' OrderDebugResponse: description: >- Debug-route payload for one rebuilt action: the EIP-712 hashes plus the action input fields. type: object required: - action_hash - action_typehash - domain_separator - encoded_data - encoded_data_hashed - expected_signer - input_data - module - owner - typed_data_hash properties: action_hash: description: >- EIP-712 struct hash of the `Action`: `keccak256(abi.encode(action_typehash, …, encoded_data_hashed, …))`. type: string action_typehash: description: >- `ACTION_TYPEHASH` — keccak of the `Action` struct type string; invariant across deployments. type: string domain_separator: description: >- EIP-712 domain separator of the Matching contract for this deployment. type: string encoded_data: description: >- ABI-encoded, module-specific action payload (the `data` bytes), 0x-hex. type: string encoded_data_hashed: description: '`keccak256(encoded_data)` — the value packed into the struct hash.' type: string expected_signer: description: The signer the signature is checked against. type: string input_data: $ref: '#/components/schemas/OrderActionInputData' description: >- The rebuilt `Action` envelope and its decoded module-specific `data`. module: description: Per-action module contract address bound into the signed struct. type: string owner: description: Wallet that owns the subaccount the action applies to. type: string recovered_signer: description: >- null on the debug routes (no signature is checked there); on a signature-mismatch error this is the address actually recovered. type: - string - 'null' typed_data_hash: description: >- Final EIP-712 digest the client signs: `keccak256(0x1901 || domain_separator || action_hash)`. type: string AlgoType: type: string enum: - twap Direction: type: string enum: - buy - sell OrderType: type: string enum: - limit - market TimeInForce: type: string enum: - gtc - post_only - fok - ioc TriggerPriceType: type: string enum: - mark - index TriggerType: type: string enum: - stoploss - takeprofit OrderActionInputData: description: >- The `Action` envelope a debug route rebuilt from the request inputs, plus its decoded action data — i.e. what the signature commits to. type: object required: - data - expiry - module - nonce - owner - signer - subaccount_id properties: data: $ref: '#/components/schemas/OrderActionDataResponse' expiry: type: integer format: uint64 minimum: 0 module: type: string nonce: type: integer format: uint64 minimum: 0 owner: type: string signer: type: string subaccount_id: type: integer format: uint64 minimum: 0 OrderActionDataResponse: type: object required: - asset_address - asset_sub_id - desired_amount - is_bid - limit_price - recipient_id - worst_fee properties: asset_address: type: string asset_sub_id: type: string desired_amount: description: >- Decimal string of the human value (e.g. `"1.5"`), up to 12 fractional digits; a string or JSON number is accepted type: string format: decimal is_bid: type: boolean limit_price: description: >- Decimal string of the human value (e.g. `"1.5"`), up to 12 fractional digits; a string or JSON number is accepted type: string format: decimal recipient_id: type: integer format: uint64 minimum: 0 worst_fee: description: >- Non-negative decimal string of the human value (e.g. `"1.5"`), up to 12 fractional digits; a string or JSON number is accepted type: string format: decimal ```` ## Related topics - [Preview EIP-712 signing data for a quote](/api-reference/rfq/preview-eip-712-signing-data-for-a-quote.md) - [Preview EIP-712 signing data for a quote execution](/api-reference/rfq/preview-eip-712-signing-data-for-a-quote-execution.md) - [Preview EIP-712 encoding for a withdrawal](/api-reference/transfers-&-withdrawals/preview-eip-712-encoding-for-a-withdrawal.md)