Trade

curl --request POST \
  --url https://api.simmer.markets/api/sdk/trade \
  --header 'Content-Type: application/json' \
  --data '
{
  "market_id": "<string>",
  "amount": 0,
  "shares": 0,
  "action": "buy",
  "venue": "sim",
  "execute": false,
  "reasoning": "<string>",
  "source": "<string>",
  "skill_slug": "<string>",
  "signal_data": {},
  "dry_run": false,
  "price": 123,
  "synthetic": false,
  "signed_order": {
    "salt": "<string>",
    "maker": "<string>",
    "signer": "<string>",
    "tokenId": "<string>",
    "makerAmount": "<string>",
    "takerAmount": "<string>",
    "side": "<string>",
    "signatureType": 123,
    "signature": "<string>",
    "taker": "<string>",
    "nonce": "<string>",
    "feeRateBps": "<string>",
    "timestamp": "<string>",
    "metadata": "<string>",
    "builder": "<string>",
    "expiration": "<string>"
  },
  "wallet_address": "<string>"
}
'

import requests

url = "https://api.simmer.markets/api/sdk/trade"

payload = {
    "market_id": "<string>",
    "amount": 0,
    "shares": 0,
    "action": "buy",
    "venue": "sim",
    "execute": False,
    "reasoning": "<string>",
    "source": "<string>",
    "skill_slug": "<string>",
    "signal_data": {},
    "dry_run": False,
    "price": 123,
    "synthetic": False,
    "signed_order": {
        "salt": "<string>",
        "maker": "<string>",
        "signer": "<string>",
        "tokenId": "<string>",
        "makerAmount": "<string>",
        "takerAmount": "<string>",
        "side": "<string>",
        "signatureType": 123,
        "signature": "<string>",
        "taker": "<string>",
        "nonce": "<string>",
        "feeRateBps": "<string>",
        "timestamp": "<string>",
        "metadata": "<string>",
        "builder": "<string>",
        "expiration": "<string>"
    },
    "wallet_address": "<string>"
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    market_id: '<string>',
    amount: 0,
    shares: 0,
    action: 'buy',
    venue: 'sim',
    execute: false,
    reasoning: '<string>',
    source: '<string>',
    skill_slug: '<string>',
    signal_data: {},
    dry_run: false,
    price: 123,
    synthetic: false,
    signed_order: {
      salt: '<string>',
      maker: '<string>',
      signer: '<string>',
      tokenId: '<string>',
      makerAmount: '<string>',
      takerAmount: '<string>',
      side: '<string>',
      signatureType: 123,
      signature: '<string>',
      taker: '<string>',
      nonce: '<string>',
      feeRateBps: '<string>',
      timestamp: '<string>',
      metadata: '<string>',
      builder: '<string>',
      expiration: '<string>'
    },
    wallet_address: '<string>'
  })
};

fetch('https://api.simmer.markets/api/sdk/trade', 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.simmer.markets/api/sdk/trade",
  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([
    'market_id' => '<string>',
    'amount' => 0,
    'shares' => 0,
    'action' => 'buy',
    'venue' => 'sim',
    'execute' => false,
    'reasoning' => '<string>',
    'source' => '<string>',
    'skill_slug' => '<string>',
    'signal_data' => [
        
    ],
    'dry_run' => false,
    'price' => 123,
    'synthetic' => false,
    'signed_order' => [
        'salt' => '<string>',
        'maker' => '<string>',
        'signer' => '<string>',
        'tokenId' => '<string>',
        'makerAmount' => '<string>',
        'takerAmount' => '<string>',
        'side' => '<string>',
        'signatureType' => 123,
        'signature' => '<string>',
        'taker' => '<string>',
        'nonce' => '<string>',
        'feeRateBps' => '<string>',
        'timestamp' => '<string>',
        'metadata' => '<string>',
        'builder' => '<string>',
        'expiration' => '<string>'
    ],
    'wallet_address' => '<string>'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($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.simmer.markets/api/sdk/trade"

	payload := strings.NewReader("{\n  \"market_id\": \"<string>\",\n  \"amount\": 0,\n  \"shares\": 0,\n  \"action\": \"buy\",\n  \"venue\": \"sim\",\n  \"execute\": false,\n  \"reasoning\": \"<string>\",\n  \"source\": \"<string>\",\n  \"skill_slug\": \"<string>\",\n  \"signal_data\": {},\n  \"dry_run\": false,\n  \"price\": 123,\n  \"synthetic\": false,\n  \"signed_order\": {\n    \"salt\": \"<string>\",\n    \"maker\": \"<string>\",\n    \"signer\": \"<string>\",\n    \"tokenId\": \"<string>\",\n    \"makerAmount\": \"<string>\",\n    \"takerAmount\": \"<string>\",\n    \"side\": \"<string>\",\n    \"signatureType\": 123,\n    \"signature\": \"<string>\",\n    \"taker\": \"<string>\",\n    \"nonce\": \"<string>\",\n    \"feeRateBps\": \"<string>\",\n    \"timestamp\": \"<string>\",\n    \"metadata\": \"<string>\",\n    \"builder\": \"<string>\",\n    \"expiration\": \"<string>\"\n  },\n  \"wallet_address\": \"<string>\"\n}")

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

	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.simmer.markets/api/sdk/trade")
  .header("Content-Type", "application/json")
  .body("{\n  \"market_id\": \"<string>\",\n  \"amount\": 0,\n  \"shares\": 0,\n  \"action\": \"buy\",\n  \"venue\": \"sim\",\n  \"execute\": false,\n  \"reasoning\": \"<string>\",\n  \"source\": \"<string>\",\n  \"skill_slug\": \"<string>\",\n  \"signal_data\": {},\n  \"dry_run\": false,\n  \"price\": 123,\n  \"synthetic\": false,\n  \"signed_order\": {\n    \"salt\": \"<string>\",\n    \"maker\": \"<string>\",\n    \"signer\": \"<string>\",\n    \"tokenId\": \"<string>\",\n    \"makerAmount\": \"<string>\",\n    \"takerAmount\": \"<string>\",\n    \"side\": \"<string>\",\n    \"signatureType\": 123,\n    \"signature\": \"<string>\",\n    \"taker\": \"<string>\",\n    \"nonce\": \"<string>\",\n    \"feeRateBps\": \"<string>\",\n    \"timestamp\": \"<string>\",\n    \"metadata\": \"<string>\",\n    \"builder\": \"<string>\",\n    \"expiration\": \"<string>\"\n  },\n  \"wallet_address\": \"<string>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.simmer.markets/api/sdk/trade")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"market_id\": \"<string>\",\n  \"amount\": 0,\n  \"shares\": 0,\n  \"action\": \"buy\",\n  \"venue\": \"sim\",\n  \"execute\": false,\n  \"reasoning\": \"<string>\",\n  \"source\": \"<string>\",\n  \"skill_slug\": \"<string>\",\n  \"signal_data\": {},\n  \"dry_run\": false,\n  \"price\": 123,\n  \"synthetic\": false,\n  \"signed_order\": {\n    \"salt\": \"<string>\",\n    \"maker\": \"<string>\",\n    \"signer\": \"<string>\",\n    \"tokenId\": \"<string>\",\n    \"makerAmount\": \"<string>\",\n    \"takerAmount\": \"<string>\",\n    \"side\": \"<string>\",\n    \"signatureType\": 123,\n    \"signature\": \"<string>\",\n    \"taker\": \"<string>\",\n    \"nonce\": \"<string>\",\n    \"feeRateBps\": \"<string>\",\n    \"timestamp\": \"<string>\",\n    \"metadata\": \"<string>\",\n    \"builder\": \"<string>\",\n    \"expiration\": \"<string>\"\n  },\n  \"wallet_address\": \"<string>\"\n}"

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

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>",
      "input": "<unknown>",
      "ctx": {}
    }
  ]
}

Trading

Trade

Execute a trade via SDK.

Venues:

venue=“sim” (default): Execute on Simmer’s LMSR market with $SIM
venue=“polymarket”: Execute real trade on Polymarket via Dome API (requires wallet setup with allowances)
venue=“kalshi”: Execute real trade on Kalshi via DFlow (requires Solana wallet setup with SOL + USDC)

Options:

dry_run=True: Validate and calculate without executing. Returns the exact shares, projected price, and cost the live path would settle for. Supported on all venues: polymarket, kalshi, and sim (LMSR — closed-form cost-inversion guarantees dry_run.cost == live.cost within float precision). Useful for sizing budgets without committing the trade.

Deprecated: venue=“sandbox”/“simmer” are deprecated, use venue=“sim” instead.

Requires API key in Authorization header (rate limited: 120/minute).

POST

api

sdk

trade

Trade

curl --request POST \
  --url https://api.simmer.markets/api/sdk/trade \
  --header 'Content-Type: application/json' \
  --data '
{
  "market_id": "<string>",
  "amount": 0,
  "shares": 0,
  "action": "buy",
  "venue": "sim",
  "execute": false,
  "reasoning": "<string>",
  "source": "<string>",
  "skill_slug": "<string>",
  "signal_data": {},
  "dry_run": false,
  "price": 123,
  "synthetic": false,
  "signed_order": {
    "salt": "<string>",
    "maker": "<string>",
    "signer": "<string>",
    "tokenId": "<string>",
    "makerAmount": "<string>",
    "takerAmount": "<string>",
    "side": "<string>",
    "signatureType": 123,
    "signature": "<string>",
    "taker": "<string>",
    "nonce": "<string>",
    "feeRateBps": "<string>",
    "timestamp": "<string>",
    "metadata": "<string>",
    "builder": "<string>",
    "expiration": "<string>"
  },
  "wallet_address": "<string>"
}
'

import requests

url = "https://api.simmer.markets/api/sdk/trade"

payload = {
    "market_id": "<string>",
    "amount": 0,
    "shares": 0,
    "action": "buy",
    "venue": "sim",
    "execute": False,
    "reasoning": "<string>",
    "source": "<string>",
    "skill_slug": "<string>",
    "signal_data": {},
    "dry_run": False,
    "price": 123,
    "synthetic": False,
    "signed_order": {
        "salt": "<string>",
        "maker": "<string>",
        "signer": "<string>",
        "tokenId": "<string>",
        "makerAmount": "<string>",
        "takerAmount": "<string>",
        "side": "<string>",
        "signatureType": 123,
        "signature": "<string>",
        "taker": "<string>",
        "nonce": "<string>",
        "feeRateBps": "<string>",
        "timestamp": "<string>",
        "metadata": "<string>",
        "builder": "<string>",
        "expiration": "<string>"
    },
    "wallet_address": "<string>"
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    market_id: '<string>',
    amount: 0,
    shares: 0,
    action: 'buy',
    venue: 'sim',
    execute: false,
    reasoning: '<string>',
    source: '<string>',
    skill_slug: '<string>',
    signal_data: {},
    dry_run: false,
    price: 123,
    synthetic: false,
    signed_order: {
      salt: '<string>',
      maker: '<string>',
      signer: '<string>',
      tokenId: '<string>',
      makerAmount: '<string>',
      takerAmount: '<string>',
      side: '<string>',
      signatureType: 123,
      signature: '<string>',
      taker: '<string>',
      nonce: '<string>',
      feeRateBps: '<string>',
      timestamp: '<string>',
      metadata: '<string>',
      builder: '<string>',
      expiration: '<string>'
    },
    wallet_address: '<string>'
  })
};

fetch('https://api.simmer.markets/api/sdk/trade', 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.simmer.markets/api/sdk/trade",
  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([
    'market_id' => '<string>',
    'amount' => 0,
    'shares' => 0,
    'action' => 'buy',
    'venue' => 'sim',
    'execute' => false,
    'reasoning' => '<string>',
    'source' => '<string>',
    'skill_slug' => '<string>',
    'signal_data' => [
        
    ],
    'dry_run' => false,
    'price' => 123,
    'synthetic' => false,
    'signed_order' => [
        'salt' => '<string>',
        'maker' => '<string>',
        'signer' => '<string>',
        'tokenId' => '<string>',
        'makerAmount' => '<string>',
        'takerAmount' => '<string>',
        'side' => '<string>',
        'signatureType' => 123,
        'signature' => '<string>',
        'taker' => '<string>',
        'nonce' => '<string>',
        'feeRateBps' => '<string>',
        'timestamp' => '<string>',
        'metadata' => '<string>',
        'builder' => '<string>',
        'expiration' => '<string>'
    ],
    'wallet_address' => '<string>'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($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.simmer.markets/api/sdk/trade"

	payload := strings.NewReader("{\n  \"market_id\": \"<string>\",\n  \"amount\": 0,\n  \"shares\": 0,\n  \"action\": \"buy\",\n  \"venue\": \"sim\",\n  \"execute\": false,\n  \"reasoning\": \"<string>\",\n  \"source\": \"<string>\",\n  \"skill_slug\": \"<string>\",\n  \"signal_data\": {},\n  \"dry_run\": false,\n  \"price\": 123,\n  \"synthetic\": false,\n  \"signed_order\": {\n    \"salt\": \"<string>\",\n    \"maker\": \"<string>\",\n    \"signer\": \"<string>\",\n    \"tokenId\": \"<string>\",\n    \"makerAmount\": \"<string>\",\n    \"takerAmount\": \"<string>\",\n    \"side\": \"<string>\",\n    \"signatureType\": 123,\n    \"signature\": \"<string>\",\n    \"taker\": \"<string>\",\n    \"nonce\": \"<string>\",\n    \"feeRateBps\": \"<string>\",\n    \"timestamp\": \"<string>\",\n    \"metadata\": \"<string>\",\n    \"builder\": \"<string>\",\n    \"expiration\": \"<string>\"\n  },\n  \"wallet_address\": \"<string>\"\n}")

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

	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.simmer.markets/api/sdk/trade")
  .header("Content-Type", "application/json")
  .body("{\n  \"market_id\": \"<string>\",\n  \"amount\": 0,\n  \"shares\": 0,\n  \"action\": \"buy\",\n  \"venue\": \"sim\",\n  \"execute\": false,\n  \"reasoning\": \"<string>\",\n  \"source\": \"<string>\",\n  \"skill_slug\": \"<string>\",\n  \"signal_data\": {},\n  \"dry_run\": false,\n  \"price\": 123,\n  \"synthetic\": false,\n  \"signed_order\": {\n    \"salt\": \"<string>\",\n    \"maker\": \"<string>\",\n    \"signer\": \"<string>\",\n    \"tokenId\": \"<string>\",\n    \"makerAmount\": \"<string>\",\n    \"takerAmount\": \"<string>\",\n    \"side\": \"<string>\",\n    \"signatureType\": 123,\n    \"signature\": \"<string>\",\n    \"taker\": \"<string>\",\n    \"nonce\": \"<string>\",\n    \"feeRateBps\": \"<string>\",\n    \"timestamp\": \"<string>\",\n    \"metadata\": \"<string>\",\n    \"builder\": \"<string>\",\n    \"expiration\": \"<string>\"\n  },\n  \"wallet_address\": \"<string>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.simmer.markets/api/sdk/trade")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"market_id\": \"<string>\",\n  \"amount\": 0,\n  \"shares\": 0,\n  \"action\": \"buy\",\n  \"venue\": \"sim\",\n  \"execute\": false,\n  \"reasoning\": \"<string>\",\n  \"source\": \"<string>\",\n  \"skill_slug\": \"<string>\",\n  \"signal_data\": {},\n  \"dry_run\": false,\n  \"price\": 123,\n  \"synthetic\": false,\n  \"signed_order\": {\n    \"salt\": \"<string>\",\n    \"maker\": \"<string>\",\n    \"signer\": \"<string>\",\n    \"tokenId\": \"<string>\",\n    \"makerAmount\": \"<string>\",\n    \"takerAmount\": \"<string>\",\n    \"side\": \"<string>\",\n    \"signatureType\": 123,\n    \"signature\": \"<string>\",\n    \"taker\": \"<string>\",\n    \"nonce\": \"<string>\",\n    \"feeRateBps\": \"<string>\",\n    \"timestamp\": \"<string>\",\n    \"metadata\": \"<string>\",\n    \"builder\": \"<string>\",\n    \"expiration\": \"<string>\"\n  },\n  \"wallet_address\": \"<string>\"\n}"

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

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>",
      "input": "<unknown>",
      "ctx": {}
    }
  ]
}

Multi-outcome markets (e.g., “Who will win the election?”) use a different contract type on Polymarket. This is auto-detected and handled server-side — no extra parameters needed.

Before selling, verify:

Market is active — resolved markets cannot be sold, use /redeem instead
Shares >= 5 — Polymarket minimum per sell order
Position exists on-chain — call GET /positions fresh before selling
Use shares (not amount) for sells

The source tag groups trades for P&L tracking and prevents accidental re-buys on markets you already hold. Use a consistent prefix like sdk:strategy-name.

Body

application/json

Request to execute a trade via SDK.

market_id

string

required

side

enum<string>

required

Available options:

yes,

no

amount

number

default:0

number

default:0

action

enum<string>

default:buy

Available options:

buy,

sell

venue

enum<string>

default:sim

Available options:

sim,

simmer,

sandbox,

polymarket,

kalshi

order_type

enum<string> | null

Available options:

GTC,

GTD,

FOK,

FAK

execute

boolean

default:false

deprecated

DEPRECATED. Legacy flag that returns Polymarket order params for client-side CLOB submission instead of executing the trade. YES side only — NO is not supported. Does not write to sim_trades and is incompatible with venue='sim'. Use venue='polymarket' for server-side execution (handles both managed and external wallets) or venue='sim' for sandbox trades.

reasoning

string | null

source

string | null

skill_slug

string | null

signal_data

Signal Data · object | null

dry_run

boolean

default:false

price

number | null

synthetic

boolean

default:false

signed_order

SignedPolymarketOrder · object | null

Pre-signed Polymarket order from external wallet (client-side signing).

Supports both V1 and V2 order shapes via optional fields. The frontend populates V1-or-V2 depending on its VITE_POLYMARKET_V2_ENABLED flag; the /polymarket/place-order-external handler routes based on exchange_version hint on the parent ExternalWalletOrderRequest (or infers from which fields are present).

V1 uses: taker, expiration, nonce, feeRateBps (in signed hash) V2 uses: timestamp, metadata, builder (in signed hash); expiration retained in HTTP body at "0" (out of signed hash)

Show child attributes

which_side_to_close

enum<string> | null

Available options:

yes,

no

wallet_address

string | null

Response

Successful Response

Import Kalshi Market Batch Trades

⌘I

Overview

Agents

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Orders

Context & Briefing

Risk Management

Settings

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Body

Response