Market Grades
List rating actions
The market’s permanent rating-actions archive: every grade establishment, upgrade, downgrade, watch, suspension, and freeze, with its driver and timing.
Not clamped to the free window: the archive is the citable record, and a truncated one would hide history. Rows are never edited; a correction is a new row that names what it corrects.
GET
/
v1
/
grades
/
{venue}
/
{market_id}
/
actions
curl
curl -s "https://api.beliefsystems.xyz/v1/grades/polymarket/0x42945ea5657d6f6e77969a06661b29d6f6295083d1ef3479b42efd90647c9dfc/actions?limit=100" \
-H "Authorization: Bearer $BELIEF_API_KEY"import os
import requests
resp = requests.get(
"https://api.beliefsystems.xyz/v1/grades/polymarket/0x42945ea5657d6f6e77969a06661b29d6f6295083d1ef3479b42efd90647c9dfc/actions?limit=100",
headers={"Authorization": f"Bearer {os.environ['BELIEF_API_KEY']}"},
timeout=10,
)
resp.raise_for_status()
payload = resp.json()
print(payload["data"])const res = await fetch("https://api.beliefsystems.xyz/v1/grades/polymarket/0x42945ea5657d6f6e77969a06661b29d6f6295083d1ef3479b42efd90647c9dfc/actions?limit=100", {
headers: { Authorization: `Bearer ${process.env.BELIEF_API_KEY}` },
});
if (!res.ok) throw new Error(`Belief Systems API ${res.status}`);
const { data, meta } = await res.json();
console.log(data);<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.beliefsystems.xyz/v1/grades/{venue}/{market_id}/actions",
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.beliefsystems.xyz/v1/grades/{venue}/{market_id}/actions"
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.beliefsystems.xyz/v1/grades/{venue}/{market_id}/actions")
.header("Authorization", "Bearer <token>")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.beliefsystems.xyz/v1/grades/{venue}/{market_id}/actions")
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{
"data": {
"count": 1,
"marketId": "0x42945ea5657d6f6e77969a06661b29d6f6295083d1ef3479b42efd90647c9dfc",
"rows": [
{
"actionId": "polymarket:0x42945ea5657d6f6e77969a06661b29d6f6295083d1ef3479b42efd90647c9dfc:1:1",
"actionSeq": 1,
"actionType": "grade_established",
"asOf": "2026-10-23T00:00:00.000000Z",
"calibrationVersion": "mg-cal-1.0",
"capsAtTime": [
{
"binding": true,
"cap_letter": "D",
"lowered_letter": false,
"source": "weakest_link"
}
],
"clockStartAsOf": null,
"correctsActionId": null,
"current": true,
"disposition": "confirmed",
"driver": "lifecycle",
"effectiveAt": "2026-10-23T00:00:00.000000Z",
"evidenceCutoff": "2026-10-23T00:00:00.000000Z",
"gradeEpisodeId": "polymarket:0x42945ea5657d6f6e77969a06661b29d6f6295083d1ef3479b42efd90647c9dfc:1",
"marketId": "0x42945ea5657d6f6e77969a06661b29d6f6295083d1ef3479b42efd90647c9dfc",
"methodologyVersion": "mg-1.2",
"newLetter": "D",
"preLaunch": false,
"priorLetter": null,
"publishedAt": "2026-10-23T01:39:00.519746Z",
"supersedesStateRevision": null,
"venue": "polymarket"
}
],
"venue": "polymarket"
},
"meta": {
"attribution": "Source: Belief Systems (beliefsystems.xyz)",
"generatedAt": "2026-10-23T15:49:14.582224Z",
"license": "https://beliefsystems.xyz/license",
"termsUrl": "https://beliefsystems.xyz/terms"
}
}{
"error": {
"code": "invalid_api_key",
"docsUrl": "https://docs.beliefsystems.xyz/api-reference/limits#invalid-api-key",
"message": "This endpoint requires a Data API key. Create one free at https://beliefsystems.xyz/data ; programmatic or commercial licensing is at https://beliefsystems.xyz/license.",
"requestId": "9f2c1ad4e6b74c0f8a3d5e1b7c904a26"
}
}{
"error": {
"code": "not_found",
"docsUrl": "https://docs.beliefsystems.xyz/api-reference/limits#not-found",
"message": "No Belief index 'NOPE'. GET /v1/indices lists the published catalog.",
"requestId": "9f2c1ad4e6b74c0f8a3d5e1b7c904a26"
}
}{
"error": {
"code": "invalid_interval",
"docsUrl": "https://docs.beliefsystems.xyz/api-reference/limits#invalid-interval",
"message": "interval must be '1h' or '1d'. Full granularity is part of the licensed feed.",
"requestId": "9f2c1ad4e6b74c0f8a3d5e1b7c904a26"
}
}{
"error": {
"code": "rate_limited",
"docsUrl": "https://docs.beliefsystems.xyz/api-reference/limits#rate-limited",
"message": "Rate limit exceeded: 60 requests per minute per key.",
"requestId": "9f2c1ad4e6b74c0f8a3d5e1b7c904a26"
}
}{
"error": {
"code": "invalid_api_key",
"docsUrl": "<string>",
"message": "<string>",
"requestId": "<string>"
}
}Authorizations
bearerAuthapiKeyAuth
Your Data API key as a Bearer token: Authorization: Bearer belief_live_.... This is the canonical form. Keys belong on a server, never in a browser.
Path Parameters
Venue slug. A market is identified by venue and market id together.
The venue's own market identifier.
Query Parameters
Maximum actions to return. 1 to 1000.
Required range:
1 <= x <= 1000⌘I
curl
curl -s "https://api.beliefsystems.xyz/v1/grades/polymarket/0x42945ea5657d6f6e77969a06661b29d6f6295083d1ef3479b42efd90647c9dfc/actions?limit=100" \
-H "Authorization: Bearer $BELIEF_API_KEY"import os
import requests
resp = requests.get(
"https://api.beliefsystems.xyz/v1/grades/polymarket/0x42945ea5657d6f6e77969a06661b29d6f6295083d1ef3479b42efd90647c9dfc/actions?limit=100",
headers={"Authorization": f"Bearer {os.environ['BELIEF_API_KEY']}"},
timeout=10,
)
resp.raise_for_status()
payload = resp.json()
print(payload["data"])const res = await fetch("https://api.beliefsystems.xyz/v1/grades/polymarket/0x42945ea5657d6f6e77969a06661b29d6f6295083d1ef3479b42efd90647c9dfc/actions?limit=100", {
headers: { Authorization: `Bearer ${process.env.BELIEF_API_KEY}` },
});
if (!res.ok) throw new Error(`Belief Systems API ${res.status}`);
const { data, meta } = await res.json();
console.log(data);<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.beliefsystems.xyz/v1/grades/{venue}/{market_id}/actions",
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.beliefsystems.xyz/v1/grades/{venue}/{market_id}/actions"
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.beliefsystems.xyz/v1/grades/{venue}/{market_id}/actions")
.header("Authorization", "Bearer <token>")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.beliefsystems.xyz/v1/grades/{venue}/{market_id}/actions")
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{
"data": {
"count": 1,
"marketId": "0x42945ea5657d6f6e77969a06661b29d6f6295083d1ef3479b42efd90647c9dfc",
"rows": [
{
"actionId": "polymarket:0x42945ea5657d6f6e77969a06661b29d6f6295083d1ef3479b42efd90647c9dfc:1:1",
"actionSeq": 1,
"actionType": "grade_established",
"asOf": "2026-10-23T00:00:00.000000Z",
"calibrationVersion": "mg-cal-1.0",
"capsAtTime": [
{
"binding": true,
"cap_letter": "D",
"lowered_letter": false,
"source": "weakest_link"
}
],
"clockStartAsOf": null,
"correctsActionId": null,
"current": true,
"disposition": "confirmed",
"driver": "lifecycle",
"effectiveAt": "2026-10-23T00:00:00.000000Z",
"evidenceCutoff": "2026-10-23T00:00:00.000000Z",
"gradeEpisodeId": "polymarket:0x42945ea5657d6f6e77969a06661b29d6f6295083d1ef3479b42efd90647c9dfc:1",
"marketId": "0x42945ea5657d6f6e77969a06661b29d6f6295083d1ef3479b42efd90647c9dfc",
"methodologyVersion": "mg-1.2",
"newLetter": "D",
"preLaunch": false,
"priorLetter": null,
"publishedAt": "2026-10-23T01:39:00.519746Z",
"supersedesStateRevision": null,
"venue": "polymarket"
}
],
"venue": "polymarket"
},
"meta": {
"attribution": "Source: Belief Systems (beliefsystems.xyz)",
"generatedAt": "2026-10-23T15:49:14.582224Z",
"license": "https://beliefsystems.xyz/license",
"termsUrl": "https://beliefsystems.xyz/terms"
}
}{
"error": {
"code": "invalid_api_key",
"docsUrl": "https://docs.beliefsystems.xyz/api-reference/limits#invalid-api-key",
"message": "This endpoint requires a Data API key. Create one free at https://beliefsystems.xyz/data ; programmatic or commercial licensing is at https://beliefsystems.xyz/license.",
"requestId": "9f2c1ad4e6b74c0f8a3d5e1b7c904a26"
}
}{
"error": {
"code": "not_found",
"docsUrl": "https://docs.beliefsystems.xyz/api-reference/limits#not-found",
"message": "No Belief index 'NOPE'. GET /v1/indices lists the published catalog.",
"requestId": "9f2c1ad4e6b74c0f8a3d5e1b7c904a26"
}
}{
"error": {
"code": "invalid_interval",
"docsUrl": "https://docs.beliefsystems.xyz/api-reference/limits#invalid-interval",
"message": "interval must be '1h' or '1d'. Full granularity is part of the licensed feed.",
"requestId": "9f2c1ad4e6b74c0f8a3d5e1b7c904a26"
}
}{
"error": {
"code": "rate_limited",
"docsUrl": "https://docs.beliefsystems.xyz/api-reference/limits#rate-limited",
"message": "Rate limit exceeded: 60 requests per minute per key.",
"requestId": "9f2c1ad4e6b74c0f8a3d5e1b7c904a26"
}
}{
"error": {
"code": "invalid_api_key",
"docsUrl": "<string>",
"message": "<string>",
"requestId": "<string>"
}
}