Trading

Batch Orders

Place multiple orders in one request.

Each order is processed independently — individual failures don’t block the rest. The batch size is limited by your API tier.

HFT optimisation: CLOB midpoint prices are pre-fetched in parallel for all unique markets in the batch before orders are processed. This collapses N sequential HTTP round-trips into one parallel burst, warming the Redis midpoint cache so each order hits the sub-ms HFT fast-path during execution.

POST

orders

batch

Batch Orders

curl --request POST \
  --url https://api.polysimulator.com/v1/orders/batch \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "orders": [
    {
      "market_id": "<string>",
      "outcome": "<string>",
      "quantity": "<string>",
      "amount": "<string>",
      "order_type": "market",
      "price": "<string>",
      "time_in_force": "GTC",
      "client_order_id": "<string>",
      "expiration": "<string>",
      "post_only": false,
      "wallet_id": 123
    }
  ]
}
'

import requests

url = "https://api.polysimulator.com/v1/orders/batch"

payload = { "orders": [
        {
            "market_id": "<string>",
            "outcome": "<string>",
            "quantity": "<string>",
            "amount": "<string>",
            "order_type": "market",
            "price": "<string>",
            "time_in_force": "GTC",
            "client_order_id": "<string>",
            "expiration": "<string>",
            "post_only": False,
            "wallet_id": 123
        }
    ] }
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    orders: [
      {
        market_id: '<string>',
        outcome: '<string>',
        quantity: '<string>',
        amount: '<string>',
        order_type: 'market',
        price: '<string>',
        time_in_force: 'GTC',
        client_order_id: '<string>',
        expiration: '<string>',
        post_only: false,
        wallet_id: 123
      }
    ]
  })
};

fetch('https://api.polysimulator.com/v1/orders/batch', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.polysimulator.com/v1/orders/batch",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'orders' => [
        [
                'market_id' => '<string>',
                'outcome' => '<string>',
                'quantity' => '<string>',
                'amount' => '<string>',
                'order_type' => 'market',
                'price' => '<string>',
                'time_in_force' => 'GTC',
                'client_order_id' => '<string>',
                'expiration' => '<string>',
                'post_only' => false,
                'wallet_id' => 123
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.polysimulator.com/v1/orders/batch"

	payload := strings.NewReader("{\n  \"orders\": [\n    {\n      \"market_id\": \"<string>\",\n      \"outcome\": \"<string>\",\n      \"quantity\": \"<string>\",\n      \"amount\": \"<string>\",\n      \"order_type\": \"market\",\n      \"price\": \"<string>\",\n      \"time_in_force\": \"GTC\",\n      \"client_order_id\": \"<string>\",\n      \"expiration\": \"<string>\",\n      \"post_only\": false,\n      \"wallet_id\": 123\n    }\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-API-Key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.polysimulator.com/v1/orders/batch")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"orders\": [\n    {\n      \"market_id\": \"<string>\",\n      \"outcome\": \"<string>\",\n      \"quantity\": \"<string>\",\n      \"amount\": \"<string>\",\n      \"order_type\": \"market\",\n      \"price\": \"<string>\",\n      \"time_in_force\": \"GTC\",\n      \"client_order_id\": \"<string>\",\n      \"expiration\": \"<string>\",\n      \"post_only\": false,\n      \"wallet_id\": 123\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.polysimulator.com/v1/orders/batch")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"orders\": [\n    {\n      \"market_id\": \"<string>\",\n      \"outcome\": \"<string>\",\n      \"quantity\": \"<string>\",\n      \"amount\": \"<string>\",\n      \"order_type\": \"market\",\n      \"price\": \"<string>\",\n      \"time_in_force\": \"GTC\",\n      \"client_order_id\": \"<string>\",\n      \"expiration\": \"<string>\",\n      \"post_only\": false,\n      \"wallet_id\": 123\n    }\n  ]\n}"

response = http.request(request)
puts response.read_body

{
  "results": [
    {
      "order_id": 123,
      "status": "<string>",
      "order_type": "<string>",
      "side": "<string>",
      "outcome": "<string>",
      "price": "<string>",
      "quantity": "<string>",
      "notional": "<string>",
      "fee": "<string>",
      "filled_at": "<string>",
      "cancelled_reason": "<string>",
      "price_source": "<string>",
      "slippage_bps": 123,
      "quote_age_ms": 123,
      "spread_bps": 123,
      "impact_bps": 123,
      "book_walk_levels": 123,
      "account_balance": "<string>",
      "position": {},
      "client_order_id": "<string>",
      "error": "<string>",
      "error_message": "<string>",
      "amount_interpreted_as": "<string>",
      "is_replay": true,
      "warnings": [
        "<string>"
      ]
    }
  ],
  "succeeded": 123,
  "failed": 123
}

{
  "error": "<string>",
  "message": "<string>",
  "details": {},
  "request_id": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "details": {},
  "request_id": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "details": {},
  "request_id": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "details": {},
  "request_id": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "details": {},
  "request_id": "<string>"
}

Authorizations

X-API-Key

string

header

required

Issue from /v1/keys (or admin-issued for enterprise tier).

Headers

X-API-Key

string | null

Your PolySimulator API key

POLY_API_KEY

string | null

Polymarket-CLOB-compat alias for X-API-Key (underscore form). SDK clients ported from Polymarket can authenticate without changing header names. X-API-Key takes precedence when both are provided.

Poly-API-Key

string | null

authorization

string | null

PM-CLOB-compat: Authorization: Bearer ps_live_... (or ps_test_...) is accepted as an alias for X-API-Key so py-clob-client and other ported SDKs authenticate without header name changes. Bearer JWTs are NOT accepted here — use the dashboard-auth endpoints for those.

Body

application/json

orders

PlaceOrderRequest · object[]

required

Required array length: 1 - 100 elements

Show child attributes

Response

Successful Response

results

OrderResponse · object[]

required

Show child attributes

succeeded

integer

required

failed

integer

required

Get a single order by ID (polysim-shape row).Returns one order row in the same Polysimulator shape as ``GET /v1/orders``. The ``order_id`` path param is the integer ID returned by ``POST /v1/orders`` / ``POST /v1/clob/order``. **ID space caveat:** ``PendingOrder.id`` (limit orders) and ``Order.id`` (pure-market fills) are independent auto-increment sequences — the same integer can refer to different rows in each table. The default lookup precedence is ``PendingOrder`` first (matches ``DELETE`` semantics and the common limit-order polling case), then ``Order`` on miss. Pass ``?source=filled`` to force the Order table for market-order pollers; ``?source=pending`` to force PendingOrder. The response carries the matched table in ``order_type`` (``limit``/``market``) so callers can verify. For unambiguous lookups use ``GET /v1/orders?status=PENDING&market_id=...`` and filter client-side by ``client_order_id``.

Batch Orders

curl --request POST \
  --url https://api.polysimulator.com/v1/orders/batch \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "orders": [
    {
      "market_id": "<string>",
      "outcome": "<string>",
      "quantity": "<string>",
      "amount": "<string>",
      "order_type": "market",
      "price": "<string>",
      "time_in_force": "GTC",
      "client_order_id": "<string>",
      "expiration": "<string>",
      "post_only": false,
      "wallet_id": 123
    }
  ]
}
'

import requests

url = "https://api.polysimulator.com/v1/orders/batch"

payload = { "orders": [
        {
            "market_id": "<string>",
            "outcome": "<string>",
            "quantity": "<string>",
            "amount": "<string>",
            "order_type": "market",
            "price": "<string>",
            "time_in_force": "GTC",
            "client_order_id": "<string>",
            "expiration": "<string>",
            "post_only": False,
            "wallet_id": 123
        }
    ] }
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    orders: [
      {
        market_id: '<string>',
        outcome: '<string>',
        quantity: '<string>',
        amount: '<string>',
        order_type: 'market',
        price: '<string>',
        time_in_force: 'GTC',
        client_order_id: '<string>',
        expiration: '<string>',
        post_only: false,
        wallet_id: 123
      }
    ]
  })
};

fetch('https://api.polysimulator.com/v1/orders/batch', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.polysimulator.com/v1/orders/batch",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'orders' => [
        [
                'market_id' => '<string>',
                'outcome' => '<string>',
                'quantity' => '<string>',
                'amount' => '<string>',
                'order_type' => 'market',
                'price' => '<string>',
                'time_in_force' => 'GTC',
                'client_order_id' => '<string>',
                'expiration' => '<string>',
                'post_only' => false,
                'wallet_id' => 123
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.polysimulator.com/v1/orders/batch"

	payload := strings.NewReader("{\n  \"orders\": [\n    {\n      \"market_id\": \"<string>\",\n      \"outcome\": \"<string>\",\n      \"quantity\": \"<string>\",\n      \"amount\": \"<string>\",\n      \"order_type\": \"market\",\n      \"price\": \"<string>\",\n      \"time_in_force\": \"GTC\",\n      \"client_order_id\": \"<string>\",\n      \"expiration\": \"<string>\",\n      \"post_only\": false,\n      \"wallet_id\": 123\n    }\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-API-Key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.polysimulator.com/v1/orders/batch")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"orders\": [\n    {\n      \"market_id\": \"<string>\",\n      \"outcome\": \"<string>\",\n      \"quantity\": \"<string>\",\n      \"amount\": \"<string>\",\n      \"order_type\": \"market\",\n      \"price\": \"<string>\",\n      \"time_in_force\": \"GTC\",\n      \"client_order_id\": \"<string>\",\n      \"expiration\": \"<string>\",\n      \"post_only\": false,\n      \"wallet_id\": 123\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.polysimulator.com/v1/orders/batch")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"orders\": [\n    {\n      \"market_id\": \"<string>\",\n      \"outcome\": \"<string>\",\n      \"quantity\": \"<string>\",\n      \"amount\": \"<string>\",\n      \"order_type\": \"market\",\n      \"price\": \"<string>\",\n      \"time_in_force\": \"GTC\",\n      \"client_order_id\": \"<string>\",\n      \"expiration\": \"<string>\",\n      \"post_only\": false,\n      \"wallet_id\": 123\n    }\n  ]\n}"

response = http.request(request)
puts response.read_body

{
  "results": [
    {
      "order_id": 123,
      "status": "<string>",
      "order_type": "<string>",
      "side": "<string>",
      "outcome": "<string>",
      "price": "<string>",
      "quantity": "<string>",
      "notional": "<string>",
      "fee": "<string>",
      "filled_at": "<string>",
      "cancelled_reason": "<string>",
      "price_source": "<string>",
      "slippage_bps": 123,
      "quote_age_ms": 123,
      "spread_bps": 123,
      "impact_bps": 123,
      "book_walk_levels": 123,
      "account_balance": "<string>",
      "position": {},
      "client_order_id": "<string>",
      "error": "<string>",
      "error_message": "<string>",
      "amount_interpreted_as": "<string>",
      "is_replay": true,
      "warnings": [
        "<string>"
      ]
    }
  ],
  "succeeded": 123,
  "failed": 123
}

{
  "error": "<string>",
  "message": "<string>",
  "details": {},
  "request_id": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "details": {},
  "request_id": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "details": {},
  "request_id": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "details": {},
  "request_id": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "details": {},
  "request_id": "<string>"
}

Overview

Endpoints

Batch Orders

Authorizations

Headers

Body

Response