Get population history for a card
curl --request GET \
--url https://api.gemrate.com/v1/cards/{gemrate_id}/population/history \
--header 'x-api-key: <api-key>'import requests
url = "https://api.gemrate.com/v1/cards/{gemrate_id}/population/history"
headers = {"x-api-key": "<api-key>"}
response = requests.get(url, headers=headers)
print(response.text)const options = {method: 'GET', headers: {'x-api-key': '<api-key>'}};
fetch('https://api.gemrate.com/v1/cards/{gemrate_id}/population/history', 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.gemrate.com/v1/cards/{gemrate_id}/population/history",
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://api.gemrate.com/v1/cards/{gemrate_id}/population/history"
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))
}HttpResponse<String> response = Unirest.get("https://api.gemrate.com/v1/cards/{gemrate_id}/population/history")
.header("x-api-key", "<api-key>")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.gemrate.com/v1/cards/{gemrate_id}/population/history")
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{
"data": {
"description": "1986 Fleer Michael Jordan Base 57",
"universal_gemrate_id": "25b4432f12a5d6ec29a6f00490200416d5dfa242",
"gemrate_id": "25b4432f12a5d6ec29a6f00490200416d5dfa242",
"is_universal_match": true,
"gemrate_url": "https://gemrate.com/card/25b4432f12a5d6ec29a6f00490200416d5dfa242",
"population": {
"graders_included": [
"psa",
"beckett",
"sgc",
"cgc"
],
"graders": {
"psa": {
"gemrate_id": "25b4432f12a5d6ec29a6f00490200416d5dfa242",
"spec_id": "299576",
"set_url": "https://www.psacard.com/pop/basketball-cards/1986/fleer/36766"
},
"beckett": {
"gemrate_id": "7a70aeda7692bf7c24a1b8def12e5afed61c5761",
"set_url": "https://www.beckett.com/grading/set_match/3022391"
},
"sgc": {
"gemrate_id": "33a95ad34c7e119fd4a3fd6235019d1893feb630",
"set_url": "https://gosgc.com/pop-report/result/1986-87%20Fleer/Basketball"
},
"cgc": {
"gemrate_id": "408287c2bd6c833dde92eb99662064a9f65afbbf",
"set_url": "https://www.cgccards.com/population-report/sports/basketball/3/1980s/32/1986-87-fleer/26933/"
}
},
"window": {
"mode": "trailing",
"interval": "day",
"as_of": "2026-06-24",
"start": "2026-06-17",
"end": "2026-06-24",
"points": 8,
"lookback": "7 day"
},
"population_data": {
"total": 30814,
"gem_total": 340,
"gem_rate": 0.011,
"data_last_updated": "2026-06-24",
"last_population_change": "2026-06-24",
"by_grader": {
"psa": {
"total": 30814,
"gem_total": 340,
"gem_rate": 0.011,
"last_population_change": "2026-06-24",
"history": [
{
"date": "2026-06-17",
"total": 30793,
"gem_total": 340,
"gem_rate": 0.011,
"grades": {
"psa_auth": 993,
"psa_1": 453,
"psa_1_5": 169,
"psa_2": 532,
"psa_2_5": 57,
"psa_3": 940,
"psa_3_5": 78,
"psa_4": 1720,
"psa_4_5": 126,
"psa_5": 2079,
"psa_5_5": 161,
"psa_6": 3240,
"psa_6_5": 217,
"psa_7": 5102,
"psa_7_5": 323,
"psa_8": 9334,
"psa_8_5": 713,
"psa_9": 3078,
"psa_10": 340
},
"qualifiers": {
"psa_q1": 13,
"psa_q1_5": 4,
"psa_q2": 4,
"psa_q3": 2,
"psa_q4": 9,
"psa_q5": 7,
"psa_q6": 8,
"psa_q7": 62,
"psa_q8": 635,
"psa_q9": 394
}
},
{
"date": "2026-06-18",
"total": 30795,
"gem_total": 340,
"gem_rate": 0.011,
"grades": {
"psa_auth": 993,
"psa_1": 453,
"psa_1_5": 169,
"psa_2": 532,
"psa_2_5": 57,
"psa_3": 941,
"psa_3_5": 78,
"psa_4": 1720,
"psa_4_5": 126,
"psa_5": 2079,
"psa_5_5": 161,
"psa_6": 3240,
"psa_6_5": 217,
"psa_7": 5102,
"psa_7_5": 323,
"psa_8": 9335,
"psa_8_5": 713,
"psa_9": 3078,
"psa_10": 340
},
"qualifiers": {
"psa_q1": 13,
"psa_q1_5": 4,
"psa_q2": 4,
"psa_q3": 2,
"psa_q4": 9,
"psa_q5": 7,
"psa_q6": 8,
"psa_q7": 62,
"psa_q8": 635,
"psa_q9": 394
}
},
{
"date": "2026-06-19",
"total": 30803,
"gem_total": 340,
"gem_rate": 0.011,
"grades": {
"psa_auth": 993,
"psa_1": 454,
"psa_1_5": 169,
"psa_2": 533,
"psa_2_5": 57,
"psa_3": 941,
"psa_3_5": 78,
"psa_4": 1722,
"psa_4_5": 126,
"psa_5": 2079,
"psa_5_5": 161,
"psa_6": 3242,
"psa_6_5": 217,
"psa_7": 5103,
"psa_7_5": 323,
"psa_8": 9336,
"psa_8_5": 713,
"psa_9": 3078,
"psa_10": 340
},
"qualifiers": {
"psa_q1": 13,
"psa_q1_5": 4,
"psa_q2": 4,
"psa_q3": 2,
"psa_q4": 9,
"psa_q5": 7,
"psa_q6": 8,
"psa_q7": 62,
"psa_q8": 635,
"psa_q9": 394
}
},
{
"date": "2026-06-20",
"total": 30804,
"gem_total": 340,
"gem_rate": 0.011,
"grades": {
"psa_auth": 993,
"psa_1": 454,
"psa_1_5": 169,
"psa_2": 533,
"psa_2_5": 57,
"psa_3": 942,
"psa_3_5": 78,
"psa_4": 1722,
"psa_4_5": 126,
"psa_5": 2079,
"psa_5_5": 161,
"psa_6": 3242,
"psa_6_5": 217,
"psa_7": 5103,
"psa_7_5": 323,
"psa_8": 9336,
"psa_8_5": 713,
"psa_9": 3078,
"psa_10": 340
},
"qualifiers": {
"psa_q1": 13,
"psa_q1_5": 4,
"psa_q2": 4,
"psa_q3": 2,
"psa_q4": 9,
"psa_q5": 7,
"psa_q6": 8,
"psa_q7": 62,
"psa_q8": 635,
"psa_q9": 394
}
},
{
"date": "2026-06-21",
"total": 30804,
"gem_total": 340,
"gem_rate": 0.011,
"grades": {
"psa_auth": 993,
"psa_1": 454,
"psa_1_5": 169,
"psa_2": 533,
"psa_2_5": 57,
"psa_3": 942,
"psa_3_5": 78,
"psa_4": 1722,
"psa_4_5": 126,
"psa_5": 2079,
"psa_5_5": 161,
"psa_6": 3242,
"psa_6_5": 217,
"psa_7": 5103,
"psa_7_5": 323,
"psa_8": 9336,
"psa_8_5": 713,
"psa_9": 3078,
"psa_10": 340
},
"qualifiers": {
"psa_q1": 13,
"psa_q1_5": 4,
"psa_q2": 4,
"psa_q3": 2,
"psa_q4": 9,
"psa_q5": 7,
"psa_q6": 8,
"psa_q7": 62,
"psa_q8": 635,
"psa_q9": 394
}
},
{
"date": "2026-06-22",
"total": 30804,
"gem_total": 340,
"gem_rate": 0.011,
"grades": {
"psa_auth": 993,
"psa_1": 454,
"psa_1_5": 169,
"psa_2": 533,
"psa_2_5": 57,
"psa_3": 942,
"psa_3_5": 78,
"psa_4": 1722,
"psa_4_5": 126,
"psa_5": 2079,
"psa_5_5": 161,
"psa_6": 3242,
"psa_6_5": 217,
"psa_7": 5103,
"psa_7_5": 323,
"psa_8": 9336,
"psa_8_5": 713,
"psa_9": 3078,
"psa_10": 340
},
"qualifiers": {
"psa_q1": 13,
"psa_q1_5": 4,
"psa_q2": 4,
"psa_q3": 2,
"psa_q4": 9,
"psa_q5": 7,
"psa_q6": 8,
"psa_q7": 62,
"psa_q8": 635,
"psa_q9": 394
}
},
{
"date": "2026-06-23",
"total": 30814,
"gem_total": 340,
"gem_rate": 0.011,
"grades": {
"psa_auth": 993,
"psa_1": 454,
"psa_1_5": 169,
"psa_2": 534,
"psa_2_5": 57,
"psa_3": 943,
"psa_3_5": 78,
"psa_4": 1722,
"psa_4_5": 126,
"psa_5": 2080,
"psa_5_5": 161,
"psa_6": 3244,
"psa_6_5": 217,
"psa_7": 5107,
"psa_7_5": 323,
"psa_8": 9336,
"psa_8_5": 713,
"psa_9": 3079,
"psa_10": 340
},
"qualifiers": {
"psa_q1": 13,
"psa_q1_5": 4,
"psa_q2": 4,
"psa_q3": 2,
"psa_q4": 9,
"psa_q5": 7,
"psa_q6": 8,
"psa_q7": 62,
"psa_q8": 635,
"psa_q9": 394
}
},
{
"date": "2026-06-24",
"total": 30814,
"gem_total": 340,
"gem_rate": 0.011,
"grades": {
"psa_auth": 993,
"psa_1": 454,
"psa_1_5": 169,
"psa_2": 534,
"psa_2_5": 57,
"psa_3": 943,
"psa_3_5": 78,
"psa_4": 1722,
"psa_4_5": 126,
"psa_5": 2080,
"psa_5_5": 161,
"psa_6": 3244,
"psa_6_5": 217,
"psa_7": 5107,
"psa_7_5": 323,
"psa_8": 9336,
"psa_8_5": 713,
"psa_9": 3079,
"psa_10": 340
},
"qualifiers": {
"psa_q1": 13,
"psa_q1_5": 4,
"psa_q2": 4,
"psa_q3": 2,
"psa_q4": 9,
"psa_q5": 7,
"psa_q6": 8,
"psa_q7": 62,
"psa_q8": 635,
"psa_q9": 394
}
}
]
},
"beckett": {
"total": 14942,
"gem_total": 0,
"gem_rate": 0,
"last_population_change": "2026-06-24",
"history": [
{
"date": "2026-06-17",
"total": 14938,
"gem_total": 554,
"gem_rate": 0.0371,
"grades": {
"beckett_1": 10,
"beckett_1_5": 42,
"beckett_2": 61,
"beckett_2_5": 91,
"beckett_3": 136,
"beckett_3_5": 180,
"beckett_4": 299,
"beckett_4_5": 262,
"beckett_5": 349,
"beckett_5_5": 405,
"beckett_6": 576,
"beckett_6_5": 818,
"beckett_7": 1279,
"beckett_7_5": 1901,
"beckett_8": 2723,
"beckett_8_5": 3308,
"beckett_9": 1944,
"beckett_9_5": 548,
"beckett_10_pristine": 6,
"beckett_10_black": 0
}
},
{
"date": "2026-06-18",
"total": 14939,
"gem_total": 554,
"gem_rate": 0.0371,
"grades": {
"beckett_1": 10,
"beckett_1_5": 42,
"beckett_2": 61,
"beckett_2_5": 91,
"beckett_3": 136,
"beckett_3_5": 180,
"beckett_4": 299,
"beckett_4_5": 262,
"beckett_5": 349,
"beckett_5_5": 405,
"beckett_6": 576,
"beckett_6_5": 818,
"beckett_7": 1279,
"beckett_7_5": 1901,
"beckett_8": 2723,
"beckett_8_5": 3309,
"beckett_9": 1944,
"beckett_9_5": 548,
"beckett_10_pristine": 6,
"beckett_10_black": 0
}
},
{
"date": "2026-06-19",
"total": 14939,
"gem_total": 554,
"gem_rate": 0.0371,
"grades": {
"beckett_1": 10,
"beckett_1_5": 42,
"beckett_2": 61,
"beckett_2_5": 91,
"beckett_3": 136,
"beckett_3_5": 180,
"beckett_4": 299,
"beckett_4_5": 262,
"beckett_5": 349,
"beckett_5_5": 405,
"beckett_6": 576,
"beckett_6_5": 818,
"beckett_7": 1279,
"beckett_7_5": 1901,
"beckett_8": 2723,
"beckett_8_5": 3309,
"beckett_9": 1944,
"beckett_9_5": 548,
"beckett_10_pristine": 6,
"beckett_10_black": 0
}
},
{
"date": "2026-06-20",
"total": 14939,
"gem_total": 554,
"gem_rate": 0.0371,
"grades": {
"beckett_1": 10,
"beckett_1_5": 42,
"beckett_2": 61,
"beckett_2_5": 91,
"beckett_3": 136,
"beckett_3_5": 180,
"beckett_4": 299,
"beckett_4_5": 262,
"beckett_5": 349,
"beckett_5_5": 405,
"beckett_6": 576,
"beckett_6_5": 818,
"beckett_7": 1279,
"beckett_7_5": 1901,
"beckett_8": 2723,
"beckett_8_5": 3309,
"beckett_9": 1944,
"beckett_9_5": 548,
"beckett_10_pristine": 6,
"beckett_10_black": 0
}
},
{
"date": "2026-06-21",
"total": 14939,
"gem_total": 554,
"gem_rate": 0.0371,
"grades": {
"beckett_1": 10,
"beckett_1_5": 42,
"beckett_2": 61,
"beckett_2_5": 91,
"beckett_3": 136,
"beckett_3_5": 180,
"beckett_4": 299,
"beckett_4_5": 262,
"beckett_5": 349,
"beckett_5_5": 405,
"beckett_6": 576,
"beckett_6_5": 818,
"beckett_7": 1279,
"beckett_7_5": 1901,
"beckett_8": 2723,
"beckett_8_5": 3309,
"beckett_9": 1944,
"beckett_9_5": 548,
"beckett_10_pristine": 6,
"beckett_10_black": 0
}
},
{
"date": "2026-06-22",
"total": 14939,
"gem_total": 554,
"gem_rate": 0.0371,
"grades": {
"beckett_1": 10,
"beckett_1_5": 42,
"beckett_2": 61,
"beckett_2_5": 91,
"beckett_3": 136,
"beckett_3_5": 180,
"beckett_4": 299,
"beckett_4_5": 262,
"beckett_5": 349,
"beckett_5_5": 405,
"beckett_6": 576,
"beckett_6_5": 818,
"beckett_7": 1279,
"beckett_7_5": 1901,
"beckett_8": 2723,
"beckett_8_5": 3309,
"beckett_9": 1944,
"beckett_9_5": 548,
"beckett_10_pristine": 6,
"beckett_10_black": 0
}
},
{
"date": "2026-06-23",
"total": 14940,
"gem_total": 554,
"gem_rate": 0.0371,
"grades": {
"beckett_1": 10,
"beckett_1_5": 42,
"beckett_2": 61,
"beckett_2_5": 91,
"beckett_3": 136,
"beckett_3_5": 180,
"beckett_4": 299,
"beckett_4_5": 262,
"beckett_5": 349,
"beckett_5_5": 405,
"beckett_6": 576,
"beckett_6_5": 818,
"beckett_7": 1279,
"beckett_7_5": 1901,
"beckett_8": 2723,
"beckett_8_5": 3310,
"beckett_9": 1944,
"beckett_9_5": 548,
"beckett_10_pristine": 6,
"beckett_10_black": 0
}
},
{
"date": "2026-06-24",
"total": 14942,
"gem_total": 554,
"gem_rate": 0.0371,
"grades": {
"beckett_1": 10,
"beckett_1_5": 42,
"beckett_2": 61,
"beckett_2_5": 91,
"beckett_3": 136,
"beckett_3_5": 180,
"beckett_4": 299,
"beckett_4_5": 262,
"beckett_5": 349,
"beckett_5_5": 405,
"beckett_6": 576,
"beckett_6_5": 818,
"beckett_7": 1279,
"beckett_7_5": 1902,
"beckett_8": 2724,
"beckett_8_5": 3310,
"beckett_9": 1944,
"beckett_9_5": 548,
"beckett_10_pristine": 6,
"beckett_10_black": 0
}
}
]
},
"sgc": {
"total": 4498,
"gem_total": 0,
"gem_rate": 0,
"last_population_change": "2026-06-24",
"history": [
{
"date": "2026-06-17",
"total": 4495,
"gem_total": 29,
"gem_rate": 0.0065,
"grades": {
"sgc_auth": 740,
"sgc_1": 46,
"sgc_1_5": 29,
"sgc_2": 52,
"sgc_2_5": 39,
"sgc_3": 139,
"sgc_3_5": 43,
"sgc_4": 215,
"sgc_4_5": 126,
"sgc_5": 312,
"sgc_5_5": 182,
"sgc_6": 383,
"sgc_6_5": 192,
"sgc_7": 476,
"sgc_7_5": 312,
"sgc_8": 505,
"sgc_8_5": 406,
"sgc_9": 236,
"sgc_9_5": 33,
"sgc_10": 28,
"sgc_10_pristine": 1
}
},
{
"date": "2026-06-18",
"total": 4496,
"gem_total": 29,
"gem_rate": 0.0065,
"grades": {
"sgc_auth": 740,
"sgc_1": 46,
"sgc_1_5": 29,
"sgc_2": 52,
"sgc_2_5": 39,
"sgc_3": 139,
"sgc_3_5": 43,
"sgc_4": 216,
"sgc_4_5": 126,
"sgc_5": 312,
"sgc_5_5": 182,
"sgc_6": 383,
"sgc_6_5": 192,
"sgc_7": 476,
"sgc_7_5": 312,
"sgc_8": 505,
"sgc_8_5": 406,
"sgc_9": 236,
"sgc_9_5": 33,
"sgc_10": 28,
"sgc_10_pristine": 1
}
},
{
"date": "2026-06-19",
"total": 4497,
"gem_total": 29,
"gem_rate": 0.0064,
"grades": {
"sgc_auth": 740,
"sgc_1": 46,
"sgc_1_5": 29,
"sgc_2": 52,
"sgc_2_5": 39,
"sgc_3": 139,
"sgc_3_5": 43,
"sgc_4": 216,
"sgc_4_5": 126,
"sgc_5": 313,
"sgc_5_5": 182,
"sgc_6": 383,
"sgc_6_5": 192,
"sgc_7": 476,
"sgc_7_5": 312,
"sgc_8": 505,
"sgc_8_5": 406,
"sgc_9": 236,
"sgc_9_5": 33,
"sgc_10": 28,
"sgc_10_pristine": 1
}
},
{
"date": "2026-06-20",
"total": 4497,
"gem_total": 29,
"gem_rate": 0.0064,
"grades": {
"sgc_auth": 740,
"sgc_1": 46,
"sgc_1_5": 29,
"sgc_2": 52,
"sgc_2_5": 39,
"sgc_3": 139,
"sgc_3_5": 43,
"sgc_4": 216,
"sgc_4_5": 126,
"sgc_5": 313,
"sgc_5_5": 182,
"sgc_6": 383,
"sgc_6_5": 192,
"sgc_7": 476,
"sgc_7_5": 312,
"sgc_8": 505,
"sgc_8_5": 406,
"sgc_9": 236,
"sgc_9_5": 33,
"sgc_10": 28,
"sgc_10_pristine": 1
}
},
{
"date": "2026-06-21",
"total": 4497,
"gem_total": 29,
"gem_rate": 0.0064,
"grades": {
"sgc_auth": 740,
"sgc_1": 46,
"sgc_1_5": 29,
"sgc_2": 52,
"sgc_2_5": 39,
"sgc_3": 139,
"sgc_3_5": 43,
"sgc_4": 216,
"sgc_4_5": 126,
"sgc_5": 313,
"sgc_5_5": 182,
"sgc_6": 383,
"sgc_6_5": 192,
"sgc_7": 476,
"sgc_7_5": 312,
"sgc_8": 505,
"sgc_8_5": 406,
"sgc_9": 236,
"sgc_9_5": 33,
"sgc_10": 28,
"sgc_10_pristine": 1
}
},
{
"date": "2026-06-22",
"total": 4497,
"gem_total": 29,
"gem_rate": 0.0064,
"grades": {
"sgc_auth": 740,
"sgc_1": 46,
"sgc_1_5": 29,
"sgc_2": 52,
"sgc_2_5": 39,
"sgc_3": 139,
"sgc_3_5": 43,
"sgc_4": 216,
"sgc_4_5": 126,
"sgc_5": 313,
"sgc_5_5": 182,
"sgc_6": 383,
"sgc_6_5": 192,
"sgc_7": 476,
"sgc_7_5": 312,
"sgc_8": 505,
"sgc_8_5": 406,
"sgc_9": 236,
"sgc_9_5": 33,
"sgc_10": 28,
"sgc_10_pristine": 1
}
},
{
"date": "2026-06-23",
"total": 4497,
"gem_total": 29,
"gem_rate": 0.0064,
"grades": {
"sgc_auth": 740,
"sgc_1": 46,
"sgc_1_5": 29,
"sgc_2": 52,
"sgc_2_5": 39,
"sgc_3": 139,
"sgc_3_5": 43,
"sgc_4": 216,
"sgc_4_5": 126,
"sgc_5": 313,
"sgc_5_5": 182,
"sgc_6": 383,
"sgc_6_5": 192,
"sgc_7": 476,
"sgc_7_5": 312,
"sgc_8": 505,
"sgc_8_5": 406,
"sgc_9": 236,
"sgc_9_5": 33,
"sgc_10": 28,
"sgc_10_pristine": 1
}
},
{
"date": "2026-06-24",
"total": 4498,
"gem_total": 29,
"gem_rate": 0.0064,
"grades": {
"sgc_auth": 740,
"sgc_1": 46,
"sgc_1_5": 29,
"sgc_2": 52,
"sgc_2_5": 39,
"sgc_3": 139,
"sgc_3_5": 43,
"sgc_4": 216,
"sgc_4_5": 126,
"sgc_5": 313,
"sgc_5_5": 182,
"sgc_6": 383,
"sgc_6_5": 192,
"sgc_7": 476,
"sgc_7_5": 312,
"sgc_8": 506,
"sgc_8_5": 406,
"sgc_9": 236,
"sgc_9_5": 33,
"sgc_10": 28,
"sgc_10_pristine": 1
}
}
]
},
"cgc": {
"total": 187,
"gem_total": 0,
"gem_rate": 0,
"last_population_change": "2026-06-24",
"history": [
{
"date": "2026-06-17",
"total": 187,
"gem_total": 1,
"gem_rate": 0.0053,
"grades": {
"cgc_auth_altered": 0,
"cgc_auth": 5,
"cgc_1": 4,
"cgc_1_5": 5,
"cgc_2": 2,
"cgc_2_5": 1,
"cgc_3": 7,
"cgc_3_5": 3,
"cgc_4": 6,
"cgc_4_5": 2,
"cgc_5": 14,
"cgc_5_5": 3,
"cgc_6": 16,
"cgc_6_5": 13,
"cgc_7": 12,
"cgc_7_5": 16,
"cgc_8": 18,
"cgc_8_5": 14,
"cgc_9": 9,
"cgc_9_5": 2,
"cgc_10": 1,
"cgc_10_pristine": 0,
"cgc_10_perfect": 0
}
},
{
"date": "2026-06-18",
"total": 187,
"gem_total": 1,
"gem_rate": 0.0053,
"grades": {
"cgc_auth_altered": 0,
"cgc_auth": 5,
"cgc_1": 4,
"cgc_1_5": 5,
"cgc_2": 2,
"cgc_2_5": 1,
"cgc_3": 7,
"cgc_3_5": 3,
"cgc_4": 6,
"cgc_4_5": 2,
"cgc_5": 14,
"cgc_5_5": 3,
"cgc_6": 16,
"cgc_6_5": 13,
"cgc_7": 12,
"cgc_7_5": 16,
"cgc_8": 18,
"cgc_8_5": 14,
"cgc_9": 9,
"cgc_9_5": 2,
"cgc_10": 1,
"cgc_10_pristine": 0,
"cgc_10_perfect": 0
}
},
{
"date": "2026-06-19",
"total": 187,
"gem_total": 1,
"gem_rate": 0.0053,
"grades": {
"cgc_auth_altered": 0,
"cgc_auth": 5,
"cgc_1": 4,
"cgc_1_5": 5,
"cgc_2": 2,
"cgc_2_5": 1,
"cgc_3": 7,
"cgc_3_5": 3,
"cgc_4": 6,
"cgc_4_5": 2,
"cgc_5": 14,
"cgc_5_5": 3,
"cgc_6": 16,
"cgc_6_5": 13,
"cgc_7": 12,
"cgc_7_5": 16,
"cgc_8": 18,
"cgc_8_5": 14,
"cgc_9": 9,
"cgc_9_5": 2,
"cgc_10": 1,
"cgc_10_pristine": 0,
"cgc_10_perfect": 0
}
},
{
"date": "2026-06-20",
"total": 187,
"gem_total": 1,
"gem_rate": 0.0053,
"grades": {
"cgc_auth_altered": 0,
"cgc_auth": 5,
"cgc_1": 4,
"cgc_1_5": 5,
"cgc_2": 2,
"cgc_2_5": 1,
"cgc_3": 7,
"cgc_3_5": 3,
"cgc_4": 6,
"cgc_4_5": 2,
"cgc_5": 14,
"cgc_5_5": 3,
"cgc_6": 16,
"cgc_6_5": 13,
"cgc_7": 12,
"cgc_7_5": 16,
"cgc_8": 18,
"cgc_8_5": 14,
"cgc_9": 9,
"cgc_9_5": 2,
"cgc_10": 1,
"cgc_10_pristine": 0,
"cgc_10_perfect": 0
}
},
{
"date": "2026-06-21",
"total": 187,
"gem_total": 1,
"gem_rate": 0.0053,
"grades": {
"cgc_auth_altered": 0,
"cgc_auth": 5,
"cgc_1": 4,
"cgc_1_5": 5,
"cgc_2": 2,
"cgc_2_5": 1,
"cgc_3": 7,
"cgc_3_5": 3,
"cgc_4": 6,
"cgc_4_5": 2,
"cgc_5": 14,
"cgc_5_5": 3,
"cgc_6": 16,
"cgc_6_5": 13,
"cgc_7": 12,
"cgc_7_5": 16,
"cgc_8": 18,
"cgc_8_5": 14,
"cgc_9": 9,
"cgc_9_5": 2,
"cgc_10": 1,
"cgc_10_pristine": 0,
"cgc_10_perfect": 0
}
},
{
"date": "2026-06-22",
"total": 187,
"gem_total": 1,
"gem_rate": 0.0053,
"grades": {
"cgc_auth_altered": 0,
"cgc_auth": 5,
"cgc_1": 4,
"cgc_1_5": 5,
"cgc_2": 2,
"cgc_2_5": 1,
"cgc_3": 7,
"cgc_3_5": 3,
"cgc_4": 6,
"cgc_4_5": 2,
"cgc_5": 14,
"cgc_5_5": 3,
"cgc_6": 16,
"cgc_6_5": 13,
"cgc_7": 12,
"cgc_7_5": 16,
"cgc_8": 18,
"cgc_8_5": 14,
"cgc_9": 9,
"cgc_9_5": 2,
"cgc_10": 1,
"cgc_10_pristine": 0,
"cgc_10_perfect": 0
}
},
{
"date": "2026-06-23",
"total": 187,
"gem_total": 1,
"gem_rate": 0.0053,
"grades": {
"cgc_auth_altered": 0,
"cgc_auth": 5,
"cgc_1": 4,
"cgc_1_5": 5,
"cgc_2": 2,
"cgc_2_5": 1,
"cgc_3": 7,
"cgc_3_5": 3,
"cgc_4": 6,
"cgc_4_5": 2,
"cgc_5": 14,
"cgc_5_5": 3,
"cgc_6": 16,
"cgc_6_5": 13,
"cgc_7": 12,
"cgc_7_5": 16,
"cgc_8": 18,
"cgc_8_5": 14,
"cgc_9": 9,
"cgc_9_5": 2,
"cgc_10": 1,
"cgc_10_pristine": 0,
"cgc_10_perfect": 0
}
},
{
"date": "2026-06-24",
"total": 187,
"gem_total": 1,
"gem_rate": 0.0053,
"grades": {
"cgc_auth_altered": 0,
"cgc_auth": 5,
"cgc_1": 4,
"cgc_1_5": 5,
"cgc_2": 2,
"cgc_2_5": 1,
"cgc_3": 7,
"cgc_3_5": 3,
"cgc_4": 6,
"cgc_4_5": 2,
"cgc_5": 14,
"cgc_5_5": 3,
"cgc_6": 16,
"cgc_6_5": 13,
"cgc_7": 12,
"cgc_7_5": 16,
"cgc_8": 18,
"cgc_8_5": 14,
"cgc_9": 9,
"cgc_9_5": 2,
"cgc_10": 1,
"cgc_10_pristine": 0,
"cgc_10_perfect": 0
}
}
]
}
}
}
}
},
"meta": {
"request_id": "local"
}
}{
"error": {
"code": "invalid_grader",
"message": "Unknown grader 'foo'."
},
"meta": {
"request_id": "req_abc123"
}
}{
"error": {
"code": "unauthorized",
"message": "Missing or invalid API key."
},
"meta": {
"request_id": "req_abc123"
}
}{
"error": {
"code": "forbidden",
"message": "Your key does not have access to this resource."
},
"meta": {
"request_id": "req_abc123"
}
}{
"error": {
"message": "<string>",
"details": {}
},
"meta": {
"request_id": "req_abc123"
}
}{
"error": {
"code": "rate_limited",
"message": "Too many requests."
},
"meta": {
"request_id": "req_abc123"
}
}{
"error": {
"code": "internal_error",
"message": "Something went wrong."
},
"meta": {
"request_id": "req_abc123"
}
}Cards
Get population history for a card
Historical data access not included in basic plans. Contact GemRate for more information.
All card grading dates are the UTC date the population change was recorded; typically the day after grading. The window.as_of property returns the latest date for which population data has been recorded.
Returns every grader’s series over a trailing three-year window anchored at the latest recorded date (window.as_of), stepping back by interval. The population.window echoes the resolved grid.
GET
/
v1
/
cards
/
{gemrate_id}
/
population
/
history
Get population history for a card
curl --request GET \
--url https://api.gemrate.com/v1/cards/{gemrate_id}/population/history \
--header 'x-api-key: <api-key>'import requests
url = "https://api.gemrate.com/v1/cards/{gemrate_id}/population/history"
headers = {"x-api-key": "<api-key>"}
response = requests.get(url, headers=headers)
print(response.text)const options = {method: 'GET', headers: {'x-api-key': '<api-key>'}};
fetch('https://api.gemrate.com/v1/cards/{gemrate_id}/population/history', 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.gemrate.com/v1/cards/{gemrate_id}/population/history",
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://api.gemrate.com/v1/cards/{gemrate_id}/population/history"
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))
}HttpResponse<String> response = Unirest.get("https://api.gemrate.com/v1/cards/{gemrate_id}/population/history")
.header("x-api-key", "<api-key>")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.gemrate.com/v1/cards/{gemrate_id}/population/history")
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{
"data": {
"description": "1986 Fleer Michael Jordan Base 57",
"universal_gemrate_id": "25b4432f12a5d6ec29a6f00490200416d5dfa242",
"gemrate_id": "25b4432f12a5d6ec29a6f00490200416d5dfa242",
"is_universal_match": true,
"gemrate_url": "https://gemrate.com/card/25b4432f12a5d6ec29a6f00490200416d5dfa242",
"population": {
"graders_included": [
"psa",
"beckett",
"sgc",
"cgc"
],
"graders": {
"psa": {
"gemrate_id": "25b4432f12a5d6ec29a6f00490200416d5dfa242",
"spec_id": "299576",
"set_url": "https://www.psacard.com/pop/basketball-cards/1986/fleer/36766"
},
"beckett": {
"gemrate_id": "7a70aeda7692bf7c24a1b8def12e5afed61c5761",
"set_url": "https://www.beckett.com/grading/set_match/3022391"
},
"sgc": {
"gemrate_id": "33a95ad34c7e119fd4a3fd6235019d1893feb630",
"set_url": "https://gosgc.com/pop-report/result/1986-87%20Fleer/Basketball"
},
"cgc": {
"gemrate_id": "408287c2bd6c833dde92eb99662064a9f65afbbf",
"set_url": "https://www.cgccards.com/population-report/sports/basketball/3/1980s/32/1986-87-fleer/26933/"
}
},
"window": {
"mode": "trailing",
"interval": "day",
"as_of": "2026-06-24",
"start": "2026-06-17",
"end": "2026-06-24",
"points": 8,
"lookback": "7 day"
},
"population_data": {
"total": 30814,
"gem_total": 340,
"gem_rate": 0.011,
"data_last_updated": "2026-06-24",
"last_population_change": "2026-06-24",
"by_grader": {
"psa": {
"total": 30814,
"gem_total": 340,
"gem_rate": 0.011,
"last_population_change": "2026-06-24",
"history": [
{
"date": "2026-06-17",
"total": 30793,
"gem_total": 340,
"gem_rate": 0.011,
"grades": {
"psa_auth": 993,
"psa_1": 453,
"psa_1_5": 169,
"psa_2": 532,
"psa_2_5": 57,
"psa_3": 940,
"psa_3_5": 78,
"psa_4": 1720,
"psa_4_5": 126,
"psa_5": 2079,
"psa_5_5": 161,
"psa_6": 3240,
"psa_6_5": 217,
"psa_7": 5102,
"psa_7_5": 323,
"psa_8": 9334,
"psa_8_5": 713,
"psa_9": 3078,
"psa_10": 340
},
"qualifiers": {
"psa_q1": 13,
"psa_q1_5": 4,
"psa_q2": 4,
"psa_q3": 2,
"psa_q4": 9,
"psa_q5": 7,
"psa_q6": 8,
"psa_q7": 62,
"psa_q8": 635,
"psa_q9": 394
}
},
{
"date": "2026-06-18",
"total": 30795,
"gem_total": 340,
"gem_rate": 0.011,
"grades": {
"psa_auth": 993,
"psa_1": 453,
"psa_1_5": 169,
"psa_2": 532,
"psa_2_5": 57,
"psa_3": 941,
"psa_3_5": 78,
"psa_4": 1720,
"psa_4_5": 126,
"psa_5": 2079,
"psa_5_5": 161,
"psa_6": 3240,
"psa_6_5": 217,
"psa_7": 5102,
"psa_7_5": 323,
"psa_8": 9335,
"psa_8_5": 713,
"psa_9": 3078,
"psa_10": 340
},
"qualifiers": {
"psa_q1": 13,
"psa_q1_5": 4,
"psa_q2": 4,
"psa_q3": 2,
"psa_q4": 9,
"psa_q5": 7,
"psa_q6": 8,
"psa_q7": 62,
"psa_q8": 635,
"psa_q9": 394
}
},
{
"date": "2026-06-19",
"total": 30803,
"gem_total": 340,
"gem_rate": 0.011,
"grades": {
"psa_auth": 993,
"psa_1": 454,
"psa_1_5": 169,
"psa_2": 533,
"psa_2_5": 57,
"psa_3": 941,
"psa_3_5": 78,
"psa_4": 1722,
"psa_4_5": 126,
"psa_5": 2079,
"psa_5_5": 161,
"psa_6": 3242,
"psa_6_5": 217,
"psa_7": 5103,
"psa_7_5": 323,
"psa_8": 9336,
"psa_8_5": 713,
"psa_9": 3078,
"psa_10": 340
},
"qualifiers": {
"psa_q1": 13,
"psa_q1_5": 4,
"psa_q2": 4,
"psa_q3": 2,
"psa_q4": 9,
"psa_q5": 7,
"psa_q6": 8,
"psa_q7": 62,
"psa_q8": 635,
"psa_q9": 394
}
},
{
"date": "2026-06-20",
"total": 30804,
"gem_total": 340,
"gem_rate": 0.011,
"grades": {
"psa_auth": 993,
"psa_1": 454,
"psa_1_5": 169,
"psa_2": 533,
"psa_2_5": 57,
"psa_3": 942,
"psa_3_5": 78,
"psa_4": 1722,
"psa_4_5": 126,
"psa_5": 2079,
"psa_5_5": 161,
"psa_6": 3242,
"psa_6_5": 217,
"psa_7": 5103,
"psa_7_5": 323,
"psa_8": 9336,
"psa_8_5": 713,
"psa_9": 3078,
"psa_10": 340
},
"qualifiers": {
"psa_q1": 13,
"psa_q1_5": 4,
"psa_q2": 4,
"psa_q3": 2,
"psa_q4": 9,
"psa_q5": 7,
"psa_q6": 8,
"psa_q7": 62,
"psa_q8": 635,
"psa_q9": 394
}
},
{
"date": "2026-06-21",
"total": 30804,
"gem_total": 340,
"gem_rate": 0.011,
"grades": {
"psa_auth": 993,
"psa_1": 454,
"psa_1_5": 169,
"psa_2": 533,
"psa_2_5": 57,
"psa_3": 942,
"psa_3_5": 78,
"psa_4": 1722,
"psa_4_5": 126,
"psa_5": 2079,
"psa_5_5": 161,
"psa_6": 3242,
"psa_6_5": 217,
"psa_7": 5103,
"psa_7_5": 323,
"psa_8": 9336,
"psa_8_5": 713,
"psa_9": 3078,
"psa_10": 340
},
"qualifiers": {
"psa_q1": 13,
"psa_q1_5": 4,
"psa_q2": 4,
"psa_q3": 2,
"psa_q4": 9,
"psa_q5": 7,
"psa_q6": 8,
"psa_q7": 62,
"psa_q8": 635,
"psa_q9": 394
}
},
{
"date": "2026-06-22",
"total": 30804,
"gem_total": 340,
"gem_rate": 0.011,
"grades": {
"psa_auth": 993,
"psa_1": 454,
"psa_1_5": 169,
"psa_2": 533,
"psa_2_5": 57,
"psa_3": 942,
"psa_3_5": 78,
"psa_4": 1722,
"psa_4_5": 126,
"psa_5": 2079,
"psa_5_5": 161,
"psa_6": 3242,
"psa_6_5": 217,
"psa_7": 5103,
"psa_7_5": 323,
"psa_8": 9336,
"psa_8_5": 713,
"psa_9": 3078,
"psa_10": 340
},
"qualifiers": {
"psa_q1": 13,
"psa_q1_5": 4,
"psa_q2": 4,
"psa_q3": 2,
"psa_q4": 9,
"psa_q5": 7,
"psa_q6": 8,
"psa_q7": 62,
"psa_q8": 635,
"psa_q9": 394
}
},
{
"date": "2026-06-23",
"total": 30814,
"gem_total": 340,
"gem_rate": 0.011,
"grades": {
"psa_auth": 993,
"psa_1": 454,
"psa_1_5": 169,
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},
"meta": {
"request_id": "req_abc123"
}
}{
"error": {
"code": "rate_limited",
"message": "Too many requests."
},
"meta": {
"request_id": "req_abc123"
}
}{
"error": {
"code": "internal_error",
"message": "Something went wrong."
},
"meta": {
"request_id": "req_abc123"
}
}Authorizations
Path Parameters
GemRate's universal identifier for a card (returned by cert and spec lookups).
Example:
"25b4432f12a5d6ec29a6f00490200416d5dfa242"
Query Parameters
Sampling cadence over the trailing three-year window.
Available options:
week, two_week Response
The card's per-grader population history.
A card's per-grader population time series. At the top level, it carries identity information for the card. Then a population with graders_included, a per-grader graders identity object, the resolved window. Lastly a population_data block with overall stats then a by_grader entry for each grader with top-level stats and a history series.
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Metadata attached to every response.
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⌘I