Discrepancy between Web UI and API for Unconfirmed Transactions

[AndoxCode]

Description

When querying the /dashboards/transaction/{:hash} endpoint for a transaction that is currently present in the mempool (i.e., visible via the Blockchair web interface with zero confirmations), the API returns an empty data array ("data": []).

This contradicts the official documentation, which states that mempool transactions should return a result where data.{:hash}.transaction.block_id yields -1. The current behavior incorrectly indicates that the transaction is "neither present in the blockchain, nor in the mempool."

Endpoint

https://api.blockchair.com/bitcoin/dashboards/transaction/5f9b5e4adce4e02fba07da67d4644c7bb75102c12a7225cbff5a23d47435b710

Expected Behavior (Per Documentation)

For a transaction currently in the mempool (0 confirmations), the API should return data, including:

data.{:hash}.transaction.block_id: -1

Actual Behavior (Reproduced with hash 5f9b5e4adce4e02fba07da67d4644c7bb75102c12a7225cbff5a23d47435b710)

The transaction is successfully found and displayed on the Blockchair web interface. However, the API returns a successful status code (200), but the data array is empty.

Actual API Response:
JSON

{
  "data": [],
  "context": {
    "code": 200,
    "source": "D",
    "results": 0,
    "state": 922004,
    "market_price_usd": 107829,
    "cache": {
      "live": false,
      "duration": 30,
      "since": "2025-11-03 05:44:39",
      "until": "2025-11-03 05:45:09",
      "time": 1.9073486328125E-6
    },
    "api": {
      "version": "2.0.95-ie",
      "last_major_update": "2022-11-07 02:00:00",
      "next_major_update": "2023-11-12 02:00:00",
      "documentation": "https://blockchair.com/api/docs",
      "notice": "Try out our new API v.3: https://3xpl.com/data"
    },
    "servers": "API4,BTC5",
    "time": 0.032195091247559,
    "render_time": 0.0065979957580566,
    "full_time": 0.0065999031066895,
    "request_cost": 1
  }
}

Steps to Reproduce

Locate a recent, unconfirmed transaction hash (confirmations = 0) on the Blockchair web interface.

Formulate the API request: https://api.blockchair.com/bitcoin/dashboards/transaction/5f9b5e4adce4e02fba07da67d4644c7bb75102c12a7225cbff5a23d47435b710

Execute the request and observe the empty data array.