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>",
"idempotency_key": "<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>",
"idempotency_key": "<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>',
idempotency_key: '<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>',
'idempotency_key' => '<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 \"idempotency_key\": \"<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 \"idempotency_key\": \"<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 \"idempotency_key\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"detail": [
{
"loc": [
"<string>"
],
"msg": "<string>",
"type": "<string>",
"input": "<unknown>",
"ctx": {}
}
]
}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 price the trade without executing it. Supported on all venues. Two limits on how far you can trust the answer:
On sim it is exact — LMSR closed-form cost-inversion guarantees dry_run.cost == live.cost within float precision. On polymarket it is an executable-book estimate: the dry-run branch resolves the requested side/action with get_executable_price(), then applies the same tick-size buffer convention used by the live path. If the book is empty or cannot be queried, dry_run returns the same kind of pricing failure instead of inventing a price from external_price_yes.
It is also not a permission check: the trading-limit enforcement below is gated on
not dry_run, so a trade that dry-runs clean can still be rejected live by a daily buy cap, a spend cap, or a cooldown.
Deprecated: venue=“sandbox”/“simmer” are deprecated, use venue=“sim” instead.
Requires an API key in the Authorization header.
Rate limits. Two independent systems apply, and grepping for one and concluding absence is how this docstring was wrong twice:
-
A per-minute cap, enforced by the API-key middleware in scripts/local_dev_server.py — NOT by a @limiter.limit decorator, which this route does not carry. Limits live in SDK_RATE_LIMITS (simmer_v3/rate_limit.py), keyed on the normalized path, counted per API-key hash in a fixed Redis window, and multiplied by tier (PRO_RATE_LIMIT_MULTIPLIER 3x, ELITE_RATE_LIMIT_MULTIPLIER 10x). This route is 60/min base, so 180 Pro and 600 Elite. Exceeding it returns a real 429 with retry_after, not a trade rejection. Unlisted /api/sdk/ paths fall back to SDK_DEFAULT_RATE_LIMIT.
-
The trading limits below, which live in the service and surface as a rejected trade with success=false — never as a 429:
- A daily BUY cap, counted across all venues by
_get_unified_daily_trade_count. Sells and redeems are exempt: the cap rails opening positions, not closing them, so hitting it never stops you exiting. (Two consumers had lost that exemption and rejected sells at the cap — restored in #2137. Keep thetrade.action != 'sell'test on any new consumer of that counter.) Values: DEFAULT_MAX_TRADES_PER_DAY / _PRO / _ELITE, overridden per user by sdk_user_settings.max_trades_per_day. - SDK_FAILED_TRADE_COOLDOWN_MINUTES per (wallet, market, side) after a failed buy.
- The account’s own sdk_max_trade_amount and sdk_daily_limit.
- On sim only, and exempt for Pro: SDK_TRADE_COOLDOWN_SECONDS per market per side.
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>",
"idempotency_key": "<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>",
"idempotency_key": "<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>',
idempotency_key: '<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>',
'idempotency_key' => '<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 \"idempotency_key\": \"<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 \"idempotency_key\": \"<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 \"idempotency_key\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"detail": [
{
"loc": [
"<string>"
],
"msg": "<string>",
"type": "<string>",
"input": "<unknown>",
"ctx": {}
}
]
}- Market is active — resolved markets cannot be sold, use
/redeeminstead - Shares >= 5 — Polymarket minimum per sell order
- Position exists on-chain — call
GET /positionsfresh before selling - Use
shares(notamount) for sells
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
Request to execute a trade via SDK.
yes, no buy, sell sim, simmer, sandbox, polymarket, kalshi GTC, GTD, FOK, FAK 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.
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
Show child attributes
yes, no Client-supplied dedup key; Redis-backed 24h, fail-closed. 1–255 chars when present.
1 - 255Response
Successful Response
