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GET /v1/mempool

Mempool size & fee histogram

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10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.

Custom headers (optional)
api.oanor.com/bitcoin-api

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Code snippets

curl "https://api.oanor.com/bitcoin-api/v1/mempool" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/bitcoin-api/v1/mempool", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/bitcoin-api/v1/mempool");
curl_setopt($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/bitcoin-api/v1/mempool",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "vsize": 44811489,
        "tx_count": 113188,
        "fee_histogram": [
            {
                "vsize": 50001,
                "fee_rate": 27.489208
            },
            {
                "vsize": 50018,
                "fee_rate": 6.0225224
            },
            {
                "vsize": 50025,
                "fee_rate": 4.1637425
            },
            {
                "vsize": 50782,
                "fee_rate": 3.6824925
            },
            {
                "vsize": 58733,
                "fee_rate": 3.342956
            },
            {
                "vsize": 53918,
                "fee_rate": 3.0489357
            },
            {
                "vsize": 50023,
                "fee_rate": 3.015873
            },
            {
                "vsize": 50011,
                "fee_rate": 2.7104073
            },
            {
                "vsize": 50447,
                "fee_rate": 2.4142857
            },
            {
                "vsize": 61311,
                "fee_rate": 2.272966
            },
            {
                "vsize": 50463,
                "fee_rate": 2.1486487
            },
            {
                "vsize": 54383,
                "fee_rate": 2.046887
            },
            {
                "vsize": 52337,
                "fee_rate": 2.0142858
            },
            {
                "vsize": 92411,
                "fee_rate": 2.0067406
            },
            {
                "vsize": 51938,
                "fee_rate": 1.9862652
            },
            {
                "vsize": 50696,
                "fee_rate": 1.5918518
            },
            {
                "vsize": 50331,
                "fee_rate": 1.5096214
            },
            {
                "vsize": 50061,
                "fee_rate": 1.2077295
            },
            {
                "vsize": 50975,
                "fee_rate": 1.1209877
            },
            {
                "vsize": 130398,
                "fee_rate": 1.1000153
            }
        ],
        "total_fee_sats": 15348896
    },
    "meta": {
        "timestamp": "2026-06-01T00:03:50.556Z",
        "request_id": "4d80eb60-40ef-4fcf-a90a-75d6fa3ff483"
    },
    "status": "ok",
    "message": "Mempool retrieved",
    "success": true
}