Match a contract

curl --request GET \
  --url https://surfaceapi.com/api/v1/match/{contractID} \
  --header 'X-API-Key: <api-key>'

const options = {method: 'GET', headers: {'X-API-Key': '<api-key>'}};

fetch('https://surfaceapi.com/api/v1/match/{contractID}', 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://surfaceapi.com/api/v1/match/{contractID}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "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"
	"net/http"
	"io"
)

func main() {

	url := "https://surfaceapi.com/api/v1/match/{contractID}"

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

	req.Header.Add("X-API-Key", "<api-key>")

	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://surfaceapi.com/api/v1/match/{contractID}")

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

request = Net::HTTP::Get.new(url)
request["X-API-Key"] = '<api-key>'

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

{
  "contracts": [
    {
      "id": "KXNBAGAME-26MAR07LACMEM-LAC",
      "parent_market_id": "KXNBAGAME-26MAR07LACMEM",
      "exchange": "kalshi",
      "question": "Los Angeles C at Memphis Winner?",
      "yes_name": "Los Angeles C",
      "no_name": "Memphis",
      "rules": "If Los Angeles C wins the game originally scheduled for Mar 7, 2026, this market resolves Yes."
    },
    {
      "id": "KXNBAGAME-26MAR07LACMEM-MEM",
      "parent_market_id": "KXNBAGAME-26MAR07LACMEM",
      "exchange": "kalshi",
      "question": "Los Angeles C at Memphis Winner?",
      "yes_name": "Memphis",
      "no_name": "Los Angeles C",
      "rules": "If Memphis wins the game originally scheduled for Mar 7, 2026, this market resolves Yes."
    },
    {
      "id": "nba-lac-mem-2026-03-07",
      "parent_market_id": "nba-lac-mem-2026-03-07",
      "exchange": "polymarket",
      "question": "Clippers vs. Grizzlies",
      "yes_name": "Clippers",
      "no_name": "Grizzlies",
      "rules": "If the Clippers win, resolves Clippers. If the Grizzlies win, resolves Grizzlies."
    }
  ],
  "relationships": [
    {
      "from": "KXNBAGAME-26MAR07LACMEM-LAC",
      "to": "nba-lac-mem-2026-03-07",
      "is_inverse": false
    },
    {
      "from": "KXNBAGAME-26MAR07LACMEM-MEM",
      "to": "nba-lac-mem-2026-03-07",
      "is_inverse": true
    }
  ]
}

GET

match

{contractID}

Match a contract

curl --request GET \
  --url https://surfaceapi.com/api/v1/match/{contractID} \
  --header 'X-API-Key: <api-key>'

const options = {method: 'GET', headers: {'X-API-Key': '<api-key>'}};

fetch('https://surfaceapi.com/api/v1/match/{contractID}', 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://surfaceapi.com/api/v1/match/{contractID}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "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"
	"net/http"
	"io"
)

func main() {

	url := "https://surfaceapi.com/api/v1/match/{contractID}"

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

	req.Header.Add("X-API-Key", "<api-key>")

	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://surfaceapi.com/api/v1/match/{contractID}")

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

request = Net::HTTP::Get.new(url)
request["X-API-Key"] = '<api-key>'

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

{
  "contracts": [
    {
      "id": "KXNBAGAME-26MAR07LACMEM-LAC",
      "parent_market_id": "KXNBAGAME-26MAR07LACMEM",
      "exchange": "kalshi",
      "question": "Los Angeles C at Memphis Winner?",
      "yes_name": "Los Angeles C",
      "no_name": "Memphis",
      "rules": "If Los Angeles C wins the game originally scheduled for Mar 7, 2026, this market resolves Yes."
    },
    {
      "id": "KXNBAGAME-26MAR07LACMEM-MEM",
      "parent_market_id": "KXNBAGAME-26MAR07LACMEM",
      "exchange": "kalshi",
      "question": "Los Angeles C at Memphis Winner?",
      "yes_name": "Memphis",
      "no_name": "Los Angeles C",
      "rules": "If Memphis wins the game originally scheduled for Mar 7, 2026, this market resolves Yes."
    },
    {
      "id": "nba-lac-mem-2026-03-07",
      "parent_market_id": "nba-lac-mem-2026-03-07",
      "exchange": "polymarket",
      "question": "Clippers vs. Grizzlies",
      "yes_name": "Clippers",
      "no_name": "Grizzlies",
      "rules": "If the Clippers win, resolves Clippers. If the Grizzlies win, resolves Grizzlies."
    }
  ],
  "relationships": [
    {
      "from": "KXNBAGAME-26MAR07LACMEM-LAC",
      "to": "nba-lac-mem-2026-03-07",
      "is_inverse": false
    },
    {
      "from": "KXNBAGAME-26MAR07LACMEM-MEM",
      "to": "nba-lac-mem-2026-03-07",
      "is_inverse": true
    }
  ]
}

string

required

Any Kalshi contract ticker or Polymarket contract slug. See Understanding contract ID for the difference between tickers and slugs.

Authorizations

X-API-Key

string

header

required

Path Parameters

contractID

string

required

Any Kalshi contract ticker or Polymarket contract ID.

Response

Cluster found.

contracts

object[]

required

All contracts in this cross-exchange group. Includes all Kalshi contracts and the Polymarket contract they map to.

Show child attributes

relationships

object[]

required

Directed edges from each Kalshi contract to the Polymarket contract, with inversion flag and confidence.

Show child attributes

Overview

Endpoints

Match a contract

Authorizations

Path Parameters

Response