CLOB Read (Public)

Get Price

Get a price for a single token.

Public endpoint — no authentication required. Mirrors Polymarket’s GET /price?token_id=...&side=BUY|SELL.

side=BUY returns the best BID; side=SELL returns the best ASK — matching Polymarket’s LIVE CLOB wire behaviour and its API reference (“Returns the best bid price for BUY side or best ask price for SELL side” — docs.polymarket.com/api-reference/ market-data/get-market-price). NOTE: PM’s own docs are self-contradictory here — the orderbook guide (trading/orderbook#prices) claims “getPrice BUY → Best ask”, which contradicts PM’s actual wire. The wire is the authority; this endpoint mirrors it. side is treated as REQUIRED at the handler level — both missing and invalid values return 400 {"error": "Invalid side"} matching Polymarket’s CLOB contract.

Implementation note: side is declared Optional in the FastAPI signature (not Query(...)) precisely so the missing-side case lands in this handler — not in api_validation_error_handler as a 422 — and yields the PM-style 400 uniformly. PM SDK porters branching on {"error": "Invalid side"} would otherwise hit two different envelopes for the same logical error.

GET

price

Get Price

curl --request GET \
  --url https://api.polysimulator.com/v1/price

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.polysimulator.com/v1/price",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
]);

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

curl_close($curl);

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

package main

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

func main() {

	url := "https://api.polysimulator.com/v1/price"

	req, _ := http.NewRequest("GET", url, nil)

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

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

	fmt.Println(string(body))

}

require 'uri'
require 'net/http'

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

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

request = Net::HTTP::Get.new(url)

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

{
  "price": "<string>",
  "quote_at": "<string>",
  "age_ms": 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>"
}

Query Parameters

token_id

string | null

Required (handler-validated) — CLOB outcome token ID. Missing OR empty returns 400 {"error": "Invalid token_id"} uniformly (no 422 leak). Same handler-validation pattern as side per Polymarket's CLOB contract.

side

string | null

Required (handler-validated) — BUY returns the best BID, SELL returns the best ASK, matching Polymarket's live CLOB wire ("Returns the best bid price for BUY side or best ask price for SELL side" — PM api-reference, get-market-price). Mirrors Polymarket's strict-side contract: missing OR invalid side returns 400 {"error": "Invalid side"} uniformly (no 422 leak). For midpoint use GET /v1/midpoint; for last-traded price use GET /v1/last-trade-price.

Response

Successful Response

price

string

required

quote_at

string | null

age_ms

integer | null

Get Price

curl --request GET \
  --url https://api.polysimulator.com/v1/price

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.polysimulator.com/v1/price",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
]);

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

curl_close($curl);

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

package main

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

func main() {

	url := "https://api.polysimulator.com/v1/price"

	req, _ := http.NewRequest("GET", url, nil)

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

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

	fmt.Println(string(body))

}

require 'uri'
require 'net/http'

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

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

request = Net::HTTP::Get.new(url)

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

{
  "price": "<string>",
  "quote_at": "<string>",
  "age_ms": 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>"
}

Overview

Endpoints

Get Price

Query Parameters

Response