/v1/chromosomes
An assembly chromosomes & sizes
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10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.
It works. Grab an API key and use it in your project.
Get an API keyCode snippets
curl "https://api.oanor.com/ucsc-api/v1/chromosomes" \ -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/ucsc-api/v1/chromosomes", {
headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/ucsc-api/v1/chromosomes");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);
import requests
requests.get(
"https://api.oanor.com/ucsc-api/v1/chromosomes",
headers={"x-oanor-key": "oanor_test_..."}
)
Example response
A real response from this endpoint, captured by the latest health check.
{
"data": {
"count": 200,
"total": 711,
"genome": "hg38",
"chromosomes": [
{
"name": "chr1",
"size_bp": 248956422
},
{
"name": "chr2",
"size_bp": 242193529
},
{
"name": "chr3",
"size_bp": 198295559
},
{
"name": "chr4",
"size_bp": 190214555
},
{
"name": "chr5",
"size_bp": 181538259
},
{
"name": "chr6",
"size_bp": 170805979
},
{
"name": "chr7",
"size_bp": 159345973
},
{
"name": "chrX",
"size_bp": 156040895
},
{
"name": "chr8",
"size_bp": 145138636
},
{
"name": "chr9",
"size_bp": 138394717
},
{
"name": "chr11",
"size_bp": 135086622
},
{
"name": "chr10",
"size_bp": 133797422
},
{
"name": "chr12",
"size_bp": 133275309
},
{
"name": "chr13",
"size_bp": 114364328
},
{
"name": "chr14",
"size_bp": 107043718
},
{
"name": "chr15",
"size_bp": 101991189
},
{
"name": "chr16",
"size_bp": 90338345
},
{
"name": "chr17",
"size_bp": 83257441
},
{
"name": "chr18",
"size_bp": 80373285
},
{
"name": "chr20",
"size_bp": 64444167
},
{
"name": "chr19",
"size_bp": 58617616
},
{
"name": "chrY",
"size_bp": 57227415
},
{
"name": "chr22",
"size_bp": 50818468
},
{
"name": "chr21",
"size_bp": 46709983
},
{
"name": "chr8_KZ208915v1_fix",
"size_bp": 6367528
},
{
"name": "chr15_ML143371v1_fix",
"size_bp": 5500449
},
{
"name": "chr15_KI270905v1_alt",
"size_bp": 5161414
},
{
"name": "chr15_KN538374v1_fix",
"size_bp": 4998962
},
{
"name": "chr6_GL000256v2_alt",
"size_bp
…