# The explore.block.space API

explore.block.space runs the open-source Mempool explorer, and with it the Mempool REST API: what is enabled, where it is documented, and real responses.

URL: https://blockspace.wiki/data/explorer-api/

[explore.block.space](https://blockspace.wiki/glossary/explore-block-space/) is block.space's sibling block explorer, the transaction view of the same chain. Its code is the public repository [BLOCKdotSPACE/blockspace-explorer](https://github.com/BLOCKdotSPACE/blockspace-explorer), a copy of the Mempool Open Source Project, which its README describes as "the fully-featured mempool visualizer, explorer, and API service". It reads [Blockspace Holdings' node and indexers](https://blockspace.wiki/glossary/blockspace-holdings-node-and-indexers/), and follows the repository's `master` branch: a push is deployed within about a minute, and a failed check puts the previous build back.

## Where the API is documented

The explorer serves its own REST API reference at https://explore.block.space/docs/api/rest. The reference is generated from the repository's API documentation file, so it lists every endpoint the Mempool code offers. This page does not copy it. It records what the deployment adds or leaves out, and shows a few real answers.

## Paths

The repository's web server configuration routes:

- `/api/v1/...` to the Mempool backend's own API (fees, mining, difficulty, blocks with extras);
- `/api/...` to the same backend under `/api/v1/`, so the Esplora-style paths (`/api/blocks/tip/height`, `/api/tx/<txid>/status`, `/api/block-height/<h>`) answer too;
- `/api/v1/ws` and `/ws` to the backend's WebSocket.

## What is switched on

The deployment's configuration names the network `mainnet` and the backend `electrum`. Statistics and fiat prices are enabled. Lightning is disabled, and so is the Stratum feature: `GET https://explore.block.space/api/v1/lightning/statistics/latest` answered `Cannot GET` on 2026-10-20.

## Examples

All read 2026-10-20 at 09:44 UTC; the public form is shown.

`https://explore.block.space/api/blocks/tip/height`:

```text
972303
```

`https://explore.block.space/api/v1/fees/recommended` (sat/vB):

```json
{"fastestFee": 3, "halfHourFee": 1, "hourFee": 1, "economyFee": 1, "minimumFee": 1}
```

`https://explore.block.space/api/mempool`:

```json
{"count": 48622, "vsize": 25142046, "total_fee": 5822318, "fee_histogram": []}
```

`https://explore.block.space/api/v1/blocks/972000`, the first block of the list, trimmed:

```json
{"id": "00000000000000000001f09a6919251b4c3dd5261ee68c8a17ec718667d35f20", "height": 972000,
 "timestamp": 1792330109, "tx_count": 4533, "size": 1852685, "weight": 3992990,
 "extras": {"totalFees": 997259, "medianFee": 0}}
```

`https://explore.block.space/api/v1/difficulty-adjustment`, trimmed:

```json
{"progressPercent": 29.315476190476193, "difficultyChange": 5.965006488566682,
 "remainingBlocks": 1425, "nextRetargetHeight": 973728}
```

`https://explore.block.space/api/tx/79103146f41684b035467d25951562db830f88e97a1ffa3a56036048da0fa491/status`:

```json
{"confirmed": true, "block_height": 972000,
 "block_hash": "00000000000000000001f09a6919251b4c3dd5261ee68c8a17ec718667d35f20", "block_time": 1792330109}
```

## How it differs from the block.space API

The explorer reports the chain as Bitcoin Core and Mempool see it: sizes, weights, fees, the [mempool](https://blockspace.wiki/glossary/mempool/). It knows nothing of [BTI](https://blockspace.wiki/glossary/bti/)'s books. The same block 972000 on [the block.space API](/data/block-space-api/) adds the attributed, claimed and content bytes. The two report different sizes for it: the explorer's `size` is 1,852,685 bytes and block.space's ledger `total_bytes` is 1,852,602, 83 bytes fewer. Compare like with like before mixing the two.

Sources:

- BLOCKdotSPACE/blockspace-explorer README · https://github.com/BLOCKdotSPACE/blockspace-explorer
- blockspace-explorer nginx-mempool.conf: the /api, /api/v1 and /ws routes · https://github.com/BLOCKdotSPACE/blockspace-explorer
- blockspace-explorer REST API documentation (frontend/src/app/docs/api-docs/api-docs-data.ts), served at /docs/api/rest · https://explore.block.space/docs/api/rest
- explore.block.space REST API, read-only GETs · https://explore.block.space/api/blocks/tip/height
- Blockspace Holdings records

Updated: 2026-10-20