mempool.recent_blocks

beta Advanced

Recent Bitcoin blocks (mempool.space v1 format).

GET /v1/mempool/recent_blocks

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#

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

Try it

Add your key to run this call right here. No key? Get one free. The key stays in this tab.

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. 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; 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 for the full list and retry guidance.

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