Get a market's closing line
curl --request GET \
--url https://api.0xinsider.com/api/v1/market/{condition_id}/close \
--header 'Authorization: Bearer <token>'import requests
url = "https://api.0xinsider.com/api/v1/market/{condition_id}/close"
headers = {"Authorization": "Bearer <token>"}
response = requests.get(url, headers=headers)
print(response.text)const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};
fetch('https://api.0xinsider.com/api/v1/market/{condition_id}/close', 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.0xinsider.com/api/v1/market/{condition_id}/close",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "GET",
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>"
],
]);
$response = curl_exec($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.0xinsider.com/api/v1/market/{condition_id}/close"
req, _ := http.NewRequest("GET", url, nil)
req.Header.Add("Authorization", "Bearer <token>")
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.0xinsider.com/api/v1/market/{condition_id}/close")
.header("Authorization", "Bearer <token>")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.0xinsider.com/api/v1/market/{condition_id}/close")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Bearer <token>'
response = http.request(request)
puts response.read_body{
"object": "market_close",
"data": {
"condition_id": "0x5f3a0000000000000000000000000000000000000000000000000000000000aa",
"status": "measured",
"unavailable_reason": null,
"game_start_time": "2026-11-02T00:20:00Z",
"close_anchor_at": "2026-11-02T00:20:00Z",
"close_anchor_source": "markets.game_start_time",
"anchor_stale": false,
"lookback_seconds": 21600,
"observed_at": "2026-11-02T00:19:00Z",
"observation_window_seconds": 60,
"price_source": "polymarket_data_v2_prices_history@minute-window-v1",
"basis_version": "data-api-v2-prices-history-resolution-v1",
"captured_at": "2026-11-02T06:41:12Z",
"outcomes": [
{
"outcome_index": 0,
"outcome": "Celtics",
"token_id": "1234",
"close_price": 0.575,
"derived_from_yes": false
},
{
"outcome_index": 1,
"outcome": "Knicks",
"token_id": "5678",
"close_price": 0.425,
"derived_from_yes": true
}
]
},
"meta": {
"request_id": "req_example",
"cached": false,
"cost": 1
}
}{
"object": "error",
"error": {
"code": "bad_request",
"message": "<string>",
"doc_url": "<string>",
"param": "<string>",
"retry_at": "2023-11-07T05:31:56Z",
"freshness": {
"max_age_s": 1,
"data_quality_status": "fresh",
"actual_age_s": 1,
"as_of": "2023-11-07T05:31:56Z"
},
"billing_url": "<string>",
"reason": "cursor_expired"
},
"meta": {
"request_id": "<string>",
"cached": true,
"cost": 123,
"cache_age_s": 123,
"ranking_generation": 123,
"ranking_as_of": "2023-11-07T05:31:56Z",
"directional_source": "live",
"ranking_source": "live",
"category_skill_source": "live",
"category_skill_model_version": "<string>",
"category_skill_taxonomy_version": "<string>",
"category_skill_platform": "polymarket",
"category_skill_scope": "observed_goldsky_primary_taker_fill",
"category_skill_source_coverage": "partial_whale_threshold_fills",
"category_skill_observation_started_at": "2023-11-07T05:31:56Z",
"category_skill_model_operationally_degraded": true,
"category_skill_status_counts": {
"live": 1,
"insufficient": 1,
"stale": 1,
"unknown": 1,
"degraded": 1
},
"category_skill_base_payload_hash": "<string>",
"category_skill_enriched_base_payload_hash": "<string>"
}
}{
"object": "error",
"error": {
"code": "bad_request",
"message": "<string>",
"doc_url": "<string>",
"param": "<string>",
"retry_at": "2023-11-07T05:31:56Z",
"freshness": {
"max_age_s": 1,
"data_quality_status": "fresh",
"actual_age_s": 1,
"as_of": "2023-11-07T05:31:56Z"
},
"billing_url": "<string>",
"reason": "cursor_expired"
},
"meta": {
"request_id": "<string>",
"cached": true,
"cost": 123,
"cache_age_s": 123,
"ranking_generation": 123,
"ranking_as_of": "2023-11-07T05:31:56Z",
"directional_source": "live",
"ranking_source": "live",
"category_skill_source": "live",
"category_skill_model_version": "<string>",
"category_skill_taxonomy_version": "<string>",
"category_skill_platform": "polymarket",
"category_skill_scope": "observed_goldsky_primary_taker_fill",
"category_skill_source_coverage": "partial_whale_threshold_fills",
"category_skill_observation_started_at": "2023-11-07T05:31:56Z",
"category_skill_model_operationally_degraded": true,
"category_skill_status_counts": {
"live": 1,
"insufficient": 1,
"stale": 1,
"unknown": 1,
"degraded": 1
},
"category_skill_base_payload_hash": "<string>",
"category_skill_enriched_base_payload_hash": "<string>"
}
}{
"object": "error",
"error": {
"code": "bad_request",
"message": "<string>",
"doc_url": "<string>",
"param": "<string>",
"retry_at": "2023-11-07T05:31:56Z",
"freshness": {
"max_age_s": 1,
"data_quality_status": "fresh",
"actual_age_s": 1,
"as_of": "2023-11-07T05:31:56Z"
},
"billing_url": "<string>",
"reason": "cursor_expired"
},
"meta": {
"request_id": "<string>",
"cached": true,
"cost": 123,
"cache_age_s": 123,
"ranking_generation": 123,
"ranking_as_of": "2023-11-07T05:31:56Z",
"directional_source": "live",
"ranking_source": "live",
"category_skill_source": "live",
"category_skill_model_version": "<string>",
"category_skill_taxonomy_version": "<string>",
"category_skill_platform": "polymarket",
"category_skill_scope": "observed_goldsky_primary_taker_fill",
"category_skill_source_coverage": "partial_whale_threshold_fills",
"category_skill_observation_started_at": "2023-11-07T05:31:56Z",
"category_skill_model_operationally_degraded": true,
"category_skill_status_counts": {
"live": 1,
"insufficient": 1,
"stale": 1,
"unknown": 1,
"degraded": 1
},
"category_skill_base_payload_hash": "<string>",
"category_skill_enriched_base_payload_hash": "<string>"
}
}{
"object": "error",
"error": {
"code": "bad_request",
"message": "<string>",
"doc_url": "<string>",
"param": "<string>",
"retry_at": "2023-11-07T05:31:56Z",
"freshness": {
"max_age_s": 1,
"data_quality_status": "fresh",
"actual_age_s": 1,
"as_of": "2023-11-07T05:31:56Z"
},
"billing_url": "<string>",
"reason": "cursor_expired"
},
"meta": {
"request_id": "<string>",
"cached": true,
"cost": 123,
"cache_age_s": 123,
"ranking_generation": 123,
"ranking_as_of": "2023-11-07T05:31:56Z",
"directional_source": "live",
"ranking_source": "live",
"category_skill_source": "live",
"category_skill_model_version": "<string>",
"category_skill_taxonomy_version": "<string>",
"category_skill_platform": "polymarket",
"category_skill_scope": "observed_goldsky_primary_taker_fill",
"category_skill_source_coverage": "partial_whale_threshold_fills",
"category_skill_observation_started_at": "2023-11-07T05:31:56Z",
"category_skill_model_operationally_degraded": true,
"category_skill_status_counts": {
"live": 1,
"insufficient": 1,
"stale": 1,
"unknown": 1,
"degraded": 1
},
"category_skill_base_payload_hash": "<string>",
"category_skill_enriched_base_payload_hash": "<string>"
}
}{
"object": "error",
"error": {
"code": "bad_request",
"message": "<string>",
"doc_url": "<string>",
"param": "<string>",
"retry_at": "2023-11-07T05:31:56Z",
"freshness": {
"max_age_s": 1,
"data_quality_status": "fresh",
"actual_age_s": 1,
"as_of": "2023-11-07T05:31:56Z"
},
"billing_url": "<string>",
"reason": "cursor_expired"
},
"meta": {
"request_id": "<string>",
"cached": true,
"cost": 123,
"cache_age_s": 123,
"ranking_generation": 123,
"ranking_as_of": "2023-11-07T05:31:56Z",
"directional_source": "live",
"ranking_source": "live",
"category_skill_source": "live",
"category_skill_model_version": "<string>",
"category_skill_taxonomy_version": "<string>",
"category_skill_platform": "polymarket",
"category_skill_scope": "observed_goldsky_primary_taker_fill",
"category_skill_source_coverage": "partial_whale_threshold_fills",
"category_skill_observation_started_at": "2023-11-07T05:31:56Z",
"category_skill_model_operationally_degraded": true,
"category_skill_status_counts": {
"live": 1,
"insufficient": 1,
"stale": 1,
"unknown": 1,
"degraded": 1
},
"category_skill_base_payload_hash": "<string>",
"category_skill_enriched_base_payload_hash": "<string>"
}
}{
"object": "error",
"error": {
"code": "bad_request",
"message": "<string>",
"doc_url": "<string>",
"param": "<string>",
"retry_at": "2023-11-07T05:31:56Z",
"freshness": {
"max_age_s": 1,
"data_quality_status": "fresh",
"actual_age_s": 1,
"as_of": "2023-11-07T05:31:56Z"
},
"billing_url": "<string>",
"reason": "cursor_expired"
},
"meta": {
"request_id": "<string>",
"cached": true,
"cost": 123,
"cache_age_s": 123,
"ranking_generation": 123,
"ranking_as_of": "2023-11-07T05:31:56Z",
"directional_source": "live",
"ranking_source": "live",
"category_skill_source": "live",
"category_skill_model_version": "<string>",
"category_skill_taxonomy_version": "<string>",
"category_skill_platform": "polymarket",
"category_skill_scope": "observed_goldsky_primary_taker_fill",
"category_skill_source_coverage": "partial_whale_threshold_fills",
"category_skill_observation_started_at": "2023-11-07T05:31:56Z",
"category_skill_model_operationally_degraded": true,
"category_skill_status_counts": {
"live": 1,
"insufficient": 1,
"stale": 1,
"unknown": 1,
"degraded": 1
},
"category_skill_base_payload_hash": "<string>",
"category_skill_enriched_base_payload_hash": "<string>"
}
}{
"object": "error",
"error": {
"code": "bad_request",
"message": "<string>",
"doc_url": "<string>",
"param": "<string>",
"retry_at": "2023-11-07T05:31:56Z",
"freshness": {
"max_age_s": 1,
"data_quality_status": "fresh",
"actual_age_s": 1,
"as_of": "2023-11-07T05:31:56Z"
},
"billing_url": "<string>",
"reason": "cursor_expired"
},
"meta": {
"request_id": "<string>",
"cached": true,
"cost": 123,
"cache_age_s": 123,
"ranking_generation": 123,
"ranking_as_of": "2023-11-07T05:31:56Z",
"directional_source": "live",
"ranking_source": "live",
"category_skill_source": "live",
"category_skill_model_version": "<string>",
"category_skill_taxonomy_version": "<string>",
"category_skill_platform": "polymarket",
"category_skill_scope": "observed_goldsky_primary_taker_fill",
"category_skill_source_coverage": "partial_whale_threshold_fills",
"category_skill_observation_started_at": "2023-11-07T05:31:56Z",
"category_skill_model_operationally_degraded": true,
"category_skill_status_counts": {
"live": 1,
"insufficient": 1,
"stale": 1,
"unknown": 1,
"degraded": 1
},
"category_skill_base_payload_hash": "<string>",
"category_skill_enriched_base_payload_hash": "<string>"
}
}{
"object": "error",
"error": {
"code": "bad_request",
"message": "<string>",
"doc_url": "<string>",
"param": "<string>",
"retry_at": "2023-11-07T05:31:56Z",
"freshness": {
"max_age_s": 1,
"data_quality_status": "fresh",
"actual_age_s": 1,
"as_of": "2023-11-07T05:31:56Z"
},
"billing_url": "<string>",
"reason": "cursor_expired"
},
"meta": {
"request_id": "<string>",
"cached": true,
"cost": 123,
"cache_age_s": 123,
"ranking_generation": 123,
"ranking_as_of": "2023-11-07T05:31:56Z",
"directional_source": "live",
"ranking_source": "live",
"category_skill_source": "live",
"category_skill_model_version": "<string>",
"category_skill_taxonomy_version": "<string>",
"category_skill_platform": "polymarket",
"category_skill_scope": "observed_goldsky_primary_taker_fill",
"category_skill_source_coverage": "partial_whale_threshold_fills",
"category_skill_observation_started_at": "2023-11-07T05:31:56Z",
"category_skill_model_operationally_degraded": true,
"category_skill_status_counts": {
"live": 1,
"insufficient": 1,
"stale": 1,
"unknown": 1,
"degraded": 1
},
"category_skill_base_payload_hash": "<string>",
"category_skill_enriched_base_payload_hash": "<string>"
}
}{
"object": "error",
"error": {
"code": "bad_request",
"message": "<string>",
"doc_url": "<string>",
"param": "<string>",
"retry_at": "2023-11-07T05:31:56Z",
"freshness": {
"max_age_s": 1,
"data_quality_status": "fresh",
"actual_age_s": 1,
"as_of": "2023-11-07T05:31:56Z"
},
"billing_url": "<string>",
"reason": "cursor_expired"
},
"meta": {
"request_id": "<string>",
"cached": true,
"cost": 123,
"cache_age_s": 123,
"ranking_generation": 123,
"ranking_as_of": "2023-11-07T05:31:56Z",
"directional_source": "live",
"ranking_source": "live",
"category_skill_source": "live",
"category_skill_model_version": "<string>",
"category_skill_taxonomy_version": "<string>",
"category_skill_platform": "polymarket",
"category_skill_scope": "observed_goldsky_primary_taker_fill",
"category_skill_source_coverage": "partial_whale_threshold_fills",
"category_skill_observation_started_at": "2023-11-07T05:31:56Z",
"category_skill_model_operationally_degraded": true,
"category_skill_status_counts": {
"live": 1,
"insufficient": 1,
"stale": 1,
"unknown": 1,
"degraded": 1
},
"category_skill_base_payload_hash": "<string>",
"category_skill_enriched_base_payload_hash": "<string>"
}
}{
"object": "error",
"error": {
"code": "bad_request",
"message": "<string>",
"doc_url": "<string>",
"param": "<string>",
"retry_at": "2023-11-07T05:31:56Z",
"freshness": {
"max_age_s": 1,
"data_quality_status": "fresh",
"actual_age_s": 1,
"as_of": "2023-11-07T05:31:56Z"
},
"billing_url": "<string>",
"reason": "cursor_expired"
},
"meta": {
"request_id": "<string>",
"cached": true,
"cost": 123,
"cache_age_s": 123,
"ranking_generation": 123,
"ranking_as_of": "2023-11-07T05:31:56Z",
"directional_source": "live",
"ranking_source": "live",
"category_skill_source": "live",
"category_skill_model_version": "<string>",
"category_skill_taxonomy_version": "<string>",
"category_skill_platform": "polymarket",
"category_skill_scope": "observed_goldsky_primary_taker_fill",
"category_skill_source_coverage": "partial_whale_threshold_fills",
"category_skill_observation_started_at": "2023-11-07T05:31:56Z",
"category_skill_model_operationally_degraded": true,
"category_skill_status_counts": {
"live": 1,
"insufficient": 1,
"stale": 1,
"unknown": 1,
"degraded": 1
},
"category_skill_base_payload_hash": "<string>",
"category_skill_enriched_base_payload_hash": "<string>"
}
}Markets
Market closing line
Get a sports or esports market’s closing price on each side, the price at kickoff, with where it came from.
GET
/
api
/
v1
/
market
/
{condition_id}
/
close
Get a market's closing line
curl --request GET \
--url https://api.0xinsider.com/api/v1/market/{condition_id}/close \
--header 'Authorization: Bearer <token>'import requests
url = "https://api.0xinsider.com/api/v1/market/{condition_id}/close"
headers = {"Authorization": "Bearer <token>"}
response = requests.get(url, headers=headers)
print(response.text)const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};
fetch('https://api.0xinsider.com/api/v1/market/{condition_id}/close', 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.0xinsider.com/api/v1/market/{condition_id}/close",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "GET",
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>"
],
]);
$response = curl_exec($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.0xinsider.com/api/v1/market/{condition_id}/close"
req, _ := http.NewRequest("GET", url, nil)
req.Header.Add("Authorization", "Bearer <token>")
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.0xinsider.com/api/v1/market/{condition_id}/close")
.header("Authorization", "Bearer <token>")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.0xinsider.com/api/v1/market/{condition_id}/close")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Bearer <token>'
response = http.request(request)
puts response.read_body{
"object": "market_close",
"data": {
"condition_id": "0x5f3a0000000000000000000000000000000000000000000000000000000000aa",
"status": "measured",
"unavailable_reason": null,
"game_start_time": "2026-11-02T00:20:00Z",
"close_anchor_at": "2026-11-02T00:20:00Z",
"close_anchor_source": "markets.game_start_time",
"anchor_stale": false,
"lookback_seconds": 21600,
"observed_at": "2026-11-02T00:19:00Z",
"observation_window_seconds": 60,
"price_source": "polymarket_data_v2_prices_history@minute-window-v1",
"basis_version": "data-api-v2-prices-history-resolution-v1",
"captured_at": "2026-11-02T06:41:12Z",
"outcomes": [
{
"outcome_index": 0,
"outcome": "Celtics",
"token_id": "1234",
"close_price": 0.575,
"derived_from_yes": false
},
{
"outcome_index": 1,
"outcome": "Knicks",
"token_id": "5678",
"close_price": 0.425,
"derived_from_yes": true
}
]
},
"meta": {
"request_id": "req_example",
"cached": false,
"cost": 1
}
}{
"object": "error",
"error": {
"code": "bad_request",
"message": "<string>",
"doc_url": "<string>",
"param": "<string>",
"retry_at": "2023-11-07T05:31:56Z",
"freshness": {
"max_age_s": 1,
"data_quality_status": "fresh",
"actual_age_s": 1,
"as_of": "2023-11-07T05:31:56Z"
},
"billing_url": "<string>",
"reason": "cursor_expired"
},
"meta": {
"request_id": "<string>",
"cached": true,
"cost": 123,
"cache_age_s": 123,
"ranking_generation": 123,
"ranking_as_of": "2023-11-07T05:31:56Z",
"directional_source": "live",
"ranking_source": "live",
"category_skill_source": "live",
"category_skill_model_version": "<string>",
"category_skill_taxonomy_version": "<string>",
"category_skill_platform": "polymarket",
"category_skill_scope": "observed_goldsky_primary_taker_fill",
"category_skill_source_coverage": "partial_whale_threshold_fills",
"category_skill_observation_started_at": "2023-11-07T05:31:56Z",
"category_skill_model_operationally_degraded": true,
"category_skill_status_counts": {
"live": 1,
"insufficient": 1,
"stale": 1,
"unknown": 1,
"degraded": 1
},
"category_skill_base_payload_hash": "<string>",
"category_skill_enriched_base_payload_hash": "<string>"
}
}{
"object": "error",
"error": {
"code": "bad_request",
"message": "<string>",
"doc_url": "<string>",
"param": "<string>",
"retry_at": "2023-11-07T05:31:56Z",
"freshness": {
"max_age_s": 1,
"data_quality_status": "fresh",
"actual_age_s": 1,
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}Use this endpoint to read the price a market closed at: Polymarket’s own price for each outcome in the last minute before the game started. It is the line every large trade’s
clv is measured against, so you can check any trade’s closing line value yourself.
For one wallet’s closing line value over many trades, use Trader closing line value.
Parameters
| Parameter | Description |
|---|---|
condition_id | Polymarket’s own id for the market, or the market’s mkt_ id. |
Key response fields
| Field | Meaning |
|---|---|
status | measured when the close is stored and outcomes carries it. pending when it is not stored yet and 0xinsider will still read it, for example before kickoff or before the market settles. unavailable when no close will be served. |
unavailable_reason | Why there is no close. It is set only when status is unavailable. The values are listed below. |
outcomes | One entry per side, YES then NO, when status is measured. It is an empty list otherwise. |
outcomes[].close_price | The side’s closing price, from 0 to 1 (0.62 is 62 cents). |
outcomes[].derived_from_yes | true on the NO side. Its price is 1 minus the YES price, because Polymarket’s two prices for a market add up to 1. |
close_anchor_at | The time the close was measured at, which is the market’s kickoff when 0xinsider stored it. |
game_start_time | The market’s kickoff as 0xinsider has it now. |
anchor_stale | true when the kickoff has moved by more than lookback_seconds since the close was stored, for example after a postponement. Large trades on such a market carry no closing line value. |
observed_at, observation_window_seconds | The price interval the close comes from. It starts at observed_at, lasts 60 seconds (3,600 for a game played more than about six days before it was read), and ends at or before close_anchor_at. |
lookback_seconds | How far before kickoff that interval may start: 21,600 seconds (6 hours). With no price in that time, the market is unavailable. |
price_source, basis_version | The Polymarket price history the close was read from and the version of the rules it was read under. |
captured_at | When 0xinsider stored the close. A close is stored once and never changes. |
Why a close is unavailable
unavailable_reason | Meaning |
|---|---|
no_observation_in_lookback | Polymarket’s price history has no interval that ends in the 6 hours before kickoff. |
provider_empty_window | Polymarket returned no prices for that time. |
provider_invalid_contract | Polymarket’s answer was not in the shape its documentation describes. |
capture_window_closed | 0xinsider did not read the market within 30 days of its kickoff. |
no_game_start_time | The market has no kickoff time, so it has no close. |
not_one_sided_resolution | The market resolved to neither side, for example a cancelled game. |
not_captured | 0xinsider does not read this market’s close: no tracked wallet bought it before it resolved, or its kickoff was more than 30 days ago. |
close_token_mismatch | The close was read for a different YES token than the market has now, so it cannot be paired with today’s outcomes. |
Example
curl -H "Authorization: Bearer $OXINSIDER_API_KEY" \
"https://api.0xinsider.com/api/v1/market/0x123.../close"
What it does not return
- A price computed from the last trade. The close is Polymarket’s own price history, read once after the market settles.
- A close for a market outside sports and esports. That market returns
404witherror.reasonmarket_out_of_scope, and a market 0xinsider has no record of returns404too. 0in place of a missing price. A market without a close sayspendingorunavailable.- Several markets at once. Request each market, or read
clv.close_priceon its large trades.
Caching
Save the response’sETag and send it in If-None-Match on your next request. If nothing has changed, the server returns 304 Not Modified with no body. A measured close never changes.Authorizations
bearerAuthoauth2
Legacy default or named integration API key, or OAuth 2.1 access token, in the Authorization header as Bearer oxi_sk_live_... or Bearer oxi_at_.... Default keys retain full access; integration keys are limited to their approved read, webhooks, export and usage scopes and expire within 90 days. All credentials share the owner's account limits. Data calls require an active Pro subscription and return live data. A 401 carries WWW-Authenticate: Bearer resource_metadata="https://api.0xinsider.com/.well-known/oauth-protected-resource" (RFC 6750 section 3, RFC 9728).
Headers
Opt into strict query-name validation. The default is compatible: unknown names are ignored and reported in X-Query-Ignored. With strict, an unknown name returns 400 bad_request with error.reason unknown_query_parameter before the handler runs, including when its percent escape is incomplete.
Available options:
strict Conditional GET validator from a previous ETag. Matching values return 304 Not Modified with an empty body.
Path Parameters
Market condition ID. Accepts the raw provider-backed condition_id returned by /api/v1/markets/search or /api/v1/markets/explore, or the mkt_-prefixed market.id emitted by V1 responses.
Response
The market's closing line, or the state that says why it has none.
Allowed value:
"market_close"A market's stored closing line (#32517): Polymarket's price-history value for the last minute bucket ending at or before kickoff, read once after settlement and never recomputed.
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