# mempool.recent_blocks

**beta** **Advanced**

Recent Bitcoin blocks (mempool.space v1 format).

`GET /v1/mempool/recent_blocks`

> [!NOTE] **Beta.** This endpoint has not yet been verified against the live source, so fields may be missing or differ until it becomes stable. Failed calls are refunded.

## What you get

A list of Mempool results in Onekey's unified shape, in `data` (an array). An empty array is a normal, successful answer and is charged like any other; a source that reports "nothing found" as an error returns a free `404 not_found` instead.

## What it costs

- **Advanced · 5 credits** for a fresh fetch, charged only when it succeeds.
- **Free when served from cache (0.2 credit for a cached response over 100 KB).**
- **Free** if the request is invalid (never charged) or the source fails or reports not found (refunded).

## Parameters

This endpoint takes no parameters.

## Request

```bash
curl "https://api.onekey.dev/v1/mempool/recent_blocks" \
  -H "x-api-key: YOUR_API_KEY"
```

```python
import requests

res = requests.get(
    "https://api.onekey.dev/v1/mempool/recent_blocks",
    params={},
    headers={"x-api-key": "YOUR_API_KEY"},
)
body = res.json()

if body["success"]:
    print(body["data"])
else:
    print(body["error"]["code"], body["error"]["message"])
```

```javascript
const params = new URLSearchParams({});
const res = await fetch(`https://api.onekey.dev/v1/mempool/recent_blocks?${params}`, {
  headers: { "x-api-key": "YOUR_API_KEY" },
});
const body = await res.json();

if (body.success) console.log(body.data);
else console.error(body.error.code, body.error.message);
```

## Recorded response

A real Mempool response, recorded and returned in Onekey's shape. Fields the platform does not provide are `null`.

```json
{
  "success": true,
  "data": [
    {
      "entity": {
        "id": "00000000000000000001f0ca6e308eca5729677c6b075c5a09f20db93dae8fc7",
        "date": "2026-09-28T19:48:45Z"
      },
      "ext": {
        "height": 969042,
        "txCount": 3722,
        "size": 1651911,
        "weight": 3993702,
        "difficulty": 132757073449487.52,
        "nonce": 1054358546,
        "merkleRoot": "d1e23d866c962d6cfd253705904d1042c33cdaa62d671d61c4b9b870e74e30b7",
        "previousBlockHash": "000000000000000000002cbcf9887b04e4e8421b692d01febadeda560348d5dd"
      }
    },
    {
      "entity": {
        "id": "000000000000000000002cbcf9887b04e4e8421b692d01febadeda560348d5dd",
        "date": "2026-09-28T19:38:28Z"
      },
      "ext": {
        "height": 969041,
        "txCount": 4055,
        "size": 1604818,
        "weight": 3997939,
        "difficulty": 132757073449487.52,
        "nonce": 3965807390,
        "merkleRoot": "bd0eab1382dc396cf6629f97e83170e385a0dc1a860455041f2fd7ce3ae0483d",
        "previousBlockHash": "000000000000000000000e3b8c0de6116179d4726ef02855e4838361a3ad0df1"
      }
    }
  ],
  "metadata": {
    "platform": "mempool",
    "endpoint": "recent_blocks",
    "cached": false,
    "stale": false,
    "age_s": 0,
    "fetched_at": "2026-01-01T12:00:00+00:00",
    "credits_charged": 5,
    "request_id": "7f3a9c2e5b1d4c8fa2e6d0b9c4f18e37"
  },
  "error": null
}
```

## Field mapping

How this endpoint's source fields become Onekey's [unified schema](https://onekey.dev/docs/schema.md). Fields the source lacks come back as `null`.

| Source path | Onekey field | Transform |
| --- | --- | --- |
| `id` | `entity.id` | - |
| `height` | `ext.height` | `toNumber` |
| `timestamp` | `entity.date` | `toIsoDate` |
| `tx_count` | `ext.txCount` | `toNumber` |
| `size` | `ext.size` | `toNumber` |
| `weight` | `ext.weight` | `toNumber` |
| `difficulty` | `ext.difficulty` | `toNumber` |
| `nonce` | `ext.nonce` | `toNumber` |
| `merkle_root` | `ext.merkleRoot` | - |
| `previousblockhash` | `ext.previousBlockHash` | - |

## Caching and freshness

- Fresh for about 30 seconds. Repeat calls in that window are served from cache and are free.
- Between 30 seconds and 5 minutes the cached copy is still served instantly and marked `stale: true` while Onekey refreshes it in the background.
- If the source is down when a refresh is needed, the last copy can be served for up to 1 hour more (marked stale).
- A "not found" is remembered for 1 minute and is free.
- The cache is shared across all customers, which is what keeps repeat calls cheap.

## What can go wrong

| Status | Code | What to do |
| --- | --- | --- |
| 401 | `unauthorized` | Check the `x-api-key` header. |
| 402 | `insufficient_credits` | [Add credits](https://onekey.dev/pricing); your balance must cover the price. |
| 404 | `not_found` | Unknown endpoint path. |
| 422 | `invalid_params` | Fix the parameters using the table above. Free. |
| 429 | `rate_limited` | Wait `Retry-After` seconds, then retry. |
| 502 | `upstream_error` | The source failed. Refunded; retry with backoff. |

See [Errors](https://onekey.dev/docs/errors.md) for the full list and retry guidance.

Status: beta (not yet verified against the live source).