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Bitcoin Mempool Unconfirmed Transactions & Congestion Monitor

Returns live count of unconfirmed Bitcoin transactions in the mempool, virtual size (vBytes), and total pending fees.

Call it (no API key)

GET https://api.agentdatahub.de/api/v1/call/bitcoin-mempool-backlog?compact=1

Full metadata: without compact=1 · Markdown: format=llm · Only some fields: add &fields=a,b.c · MCP: tool call_api with {"apiId":"bitcoin-mempool-backlog"}

Parameters

None.

Example response (live, compact)

{
  "apiId": "bitcoin-mempool-backlog",
  "data_freshness": "live",
  "data": {
    "unconfirmed_tx_count": 48851,
    "vsize_bytes": 20148919,
    "vsize_megabytes": 20.15,
    "total_fee_btc": 0.0303
  },
  "source": "Mempool.space Backlog API",
  "license": "MIT Open Source Blockchain Data"
}

Source & license