> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vatic.trading/llms.txt
> Use this file to discover all available pages before exploring further.

# Place Order (Legacy)

> Submits a Polymarket CLOB limit order using the legacy EIP-712 signing flow. Prefer `/api/v1/simpleOrders/createLimitOrder` for new integrations.



## OpenAPI

````yaml POST /api/v1/orders
openapi: 3.1.0
info:
  title: Vatic API
  version: 1.0.0
  description: >-
    Polymarket price targets, Hyperliquid prediction market data, market
    timestamps, fee calculators, and order management for systematic prediction
    market trading.
servers:
  - url: https://api.vatic.trading
    description: Production
security: []
paths:
  /api/v1/orders:
    post:
      tags:
        - Orders
      summary: Place order (legacy EIP-712 flow)
      description: >-
        Submits a Polymarket CLOB limit order using the legacy EIP-712 signing
        flow. Prefer `/api/v1/simpleOrders/createLimitOrder` for new
        integrations.
      operationId: postOrders
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - walletId
                - tokenId
                - side
                - price
                - size
              properties:
                walletId:
                  type: string
                  format: uuid
                tokenId:
                  type: string
                  description: Polymarket outcome token ID.
                side:
                  type: string
                  enum:
                    - BUY
                    - SELL
                price:
                  type: number
                  minimum: 0.01
                  maximum: 0.99
                  description: Limit price (0.01–0.99).
                size:
                  type: number
                  minimum: 1
                  description: Order size in USDC (min 1).
      responses:
        '200':
          description: Order submitted
          content:
            application/json:
              example:
                ok: true
                orderId: 0xabc...
                status: matched
                safeAddress: 0x...
                order:
                  tokenId: ...
                  side: BUY
                  price: 0.5
                  size: 10
                  makerAmount: '10000000'
                  takerAmount: '20000000'
        '400':
          description: Validation error
        '401':
          description: Invalid API key
        '404':
          description: Wallet not found
      security:
        - ApiKey: []
components:
  securitySchemes:
    ApiKey:
      type: apiKey
      in: header
      name: x-api-key
      description: >-
        Required for order endpoints. Obtain your API key from the Vatic
        dashboard.

````