Price spreads
curl --request GET \
--url https://api.oddpool.com/arbitrage/current/differenceimport requests
url = "https://api.oddpool.com/arbitrage/current/difference"
response = requests.get(url)
print(response.text)const options = {method: 'GET'};
fetch('https://api.oddpool.com/arbitrage/current/difference', 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.oddpool.com/arbitrage/current/difference",
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.oddpool.com/arbitrage/current/difference"
req, _ := http.NewRequest("GET", url, nil)
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.get("https://api.oddpool.com/arbitrage/current/difference")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.oddpool.com/arbitrage/current/difference")
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_bodyArbitrage
Price spreads
Find where venues disagree on the same outcome’s price.
GET
/
arbitrage
/
current
/
difference
Price spreads
curl --request GET \
--url https://api.oddpool.com/arbitrage/current/differenceimport requests
url = "https://api.oddpool.com/arbitrage/current/difference"
response = requests.get(url)
print(response.text)const options = {method: 'GET'};
fetch('https://api.oddpool.com/arbitrage/current/difference', 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.oddpool.com/arbitrage/current/difference",
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.oddpool.com/arbitrage/current/difference"
req, _ := http.NewRequest("GET", url, nil)
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.get("https://api.oddpool.com/arbitrage/current/difference")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.oddpool.com/arbitrage/current/difference")
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_bodyFind where venues disagree on the same outcome’s price. A large spread signals potential mispricing.
Example: “Will the Fed cut rates?” — YES is 42c on Kalshi but 39c on Polymarket. If you think the true price is closer to 42c, Polymarket is offering a discount.
Unlike arbitrage, price spreads are not risk-free. They highlight venue disagreement, which can signal a trading edge.
Parameters
integer
default:"10000"
Lookback window in minutes.
Example
curl -H "X-API-Key: your_api_key" \
"https://api.oddpool.com/arbitrage/current/difference?minutes=10"
import requests
response = requests.get(
"https://api.oddpool.com/arbitrage/current/difference",
headers={"X-API-Key": "your_api_key"},
params={"minutes": 10}
)
diffs = response.json()
Response
Each row also includes fullkalshi, polymarket, and opinion venue blocks (with prices, volume, and execution-ready identifiers like market_ticker, condition_id, and yes_token_id / no_token_id) — see the Cross-venue arbitrage reference for the full venue-block shape.
[
{
"event_id": 42,
"event_title": "Fed rate decision March",
"kalshi_event_ticker": "KXFEDDECISION-26MAR",
"polymarket_event_slug": "fed-rate-march",
"opinion_market_id": null,
"market_type": "binary",
"outcome_key": "yes",
"label": "25bps cut",
"timestamp": "2026-03-11T14:30:00",
"resolution_time": "2026-03-19T18:00:00",
"kalshi": { "market_ticker": "KXFEDDECISION-26MAR-C25", "yes_ask": 0.42, "no_ask": 0.60, "...": "..." },
"polymarket": { "condition_id": "0xde04...", "yes_token_id": "307678...", "no_token_id": "403029...", "yes_ask": 0.39, "no_ask": 0.63, "...": "..." },
"opinion": { "child_market_id": null, "yes_token_id": null, "no_token_id": null, "...": "..." },
"side": "YES",
"side1": "Kalshi",
"side2": "Polymarket",
"side1_price": 0.42,
"side2_price": 0.39,
"diff": 0.03
}
]
⌘I