> ## 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. # Estimate order cost and margin without authentication > Public dry-run variant of order_quote that estimates fill price, fees, margin impact, projected order status and realized PnL for a prospective order without placing it, returning all values as decimal strings. Unlike private/order_quote it bypasses session scope checks, so it can be used to preview costs without account authentication. ## OpenAPI ````yaml /openapi.json post /public/order_quote 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: /public/order_quote: post: tags: - Orderbook summary: Estimate order cost and margin without authentication description: >- Public dry-run variant of order_quote that estimates fill price, fees, margin impact, projected order status and realized PnL for a prospective order without placing it, returning all values as decimal strings. Unlike private/order_quote it bypasses session scope checks, so it can be used to preview costs without account authentication. operationId: public_order_quote requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/OrderQuoteRequest' responses: '200': description: Success content: application/json: schema: $ref: '#/components/schemas/OrderQuoteResponse' default: description: JSON-RPC error (see Error Codes) components: schemas: OrderQuoteRequest: description: Parameters for `public/order_quote` and `private/order_quote`. type: object required: - amount - direction - instrument_name - limit_price - max_fee - nonce - signature - signature_expiry_sec - signer - subaccount_id properties: 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: '' type: string direction: $ref: '#/components/schemas/Direction' description: Order 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: description: Instrument name type: string is_atomic_signing: default: false type: boolean label: default: '' type: string limit_price: description: Limit price in quote currency, as a decimal string 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: false type: boolean nonce: description: Nonce. type: string order_type: $ref: '#/components/schemas/OrderType' default: limit reduce_only: default: false type: boolean referral_code: default: '' type: string reject_post_only: default: true type: boolean reject_timestamp: default: 9223372036854776000 type: integer format: int64 signature: description: Ethereum signature of the order. type: string signature_expiry_sec: description: Signature expiry (unix seconds). type: integer format: int64 signer: description: Owner wallet or session key that signed the order. type: string subaccount_id: description: 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: anyOf: - $ref: '#/components/schemas/TriggerPriceType' - type: 'null' trigger_type: anyOf: - $ref: '#/components/schemas/TriggerType' - type: 'null' OrderQuoteResponse: description: >- Estimated fill price, fees, and resulting margin for a proposed order — a non-binding dry-run. All price, fee, and margin fields are decimal strings. type: object required: - estimated_fee - estimated_fill_amount - estimated_fill_price - estimated_order_status - estimated_realized_pnl - estimated_realized_pnl_excl_fees - is_valid - post_initial_margin - pre_initial_margin - suggested_max_fee properties: estimated_fee: type: string estimated_fill_amount: type: string estimated_fill_price: type: string estimated_order_status: $ref: '#/components/schemas/OrderStatus' estimated_realized_pnl: type: string estimated_realized_pnl_excl_fees: type: string invalid_reason: type: - string - 'null' is_valid: type: boolean max_amount: type: - string - 'null' post_initial_margin: type: string post_liquidation_price: type: - string - 'null' pre_initial_margin: type: string suggested_max_fee: type: string 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 OrderStatus: type: string enum: - open - filled - rejected - cancelled - expired - untriggered - algo_active ```` ## Related topics - [Estimate the cost and margin impact of an order](/api-reference/orderbook/estimate-the-cost-and-margin-impact-of-an-order.md) - [Preview the best quote for an RFQ](/api-reference/rfq/preview-the-best-quote-for-an-rfq.md) - [Cancel orders matching a label](/api-reference/orderbook/cancel-orders-matching-a-label.md)