# Bitcoin Mempool Snapshot

> Bitcoin Mempool Snapshot is a paid API for AI agents from chain.openverbs.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-15).

Returns a live snapshot of the Bitcoin mempool including unconfirmed transaction count, pending virtual size, block backlog, total pending fees, fee-rate histogram, and current chain tip height.

## Facts

- Endpoint: POST https://chain.openverbs.com/v1/btc-mempool
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/bitcoin-mempool-snapshot-0ba388dc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yTB4FmLlaJJ-8bk3jKIfK

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability bitcoin-mempool-snapshot-0ba388dc -d '<json body>'
```

Example prompt: What does the Bitcoin mempool look like right now — how many unconfirmed transactions are waiting, how many blocks of backlog is there, and what are the total fees pending?

## When to prefer this

Use this endpoint when an agent needs a comprehensive, real-time overview of Bitcoin mempool conditions — especially when making decisions about transaction timing, estimating confirmation delays, or monitoring network congestion. Prefer this over fee-rate-only endpoints when you need the full picture including block backlog, total pending fees, and the fee-rate histogram in one call.

## Known failure modes

- Network connectivity issues reaching the Bitcoin node may return a 503 or timeout
- Payment failure or insufficient USDC balance results in a 402 Payment Required response
- Malformed request body returns a 400 Bad Request
- Bitcoin node temporarily out of sync may return stale or incomplete data

## How this service works

Live snapshot of the Bitcoin mempool: number of unconfirmed transactions, total pending virtual size (bytes and MB), the current backlog in blocks, total fees pending (sats and BTC), the fee-rate histogram, and the current chain tip height. Lets an agent gauge network congestion and time a transaction.

## Output

Returns a live mempool snapshot including: number of unconfirmed transactions, total pending virtual size in bytes and MB, current block backlog count, total pending fees in both satoshis and BTC, a fee-rate histogram showing distribution of transactions across fee-rate buckets, and the current Bitcoin chain tip height.

## Request schema (JSON Schema)

```json
{
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "type": "object",
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "type": "string",
     "enum": [
      "POST"
     ]
    },
    "bodyType": {
     "type": "string",
     "enum": [
      "json",
      "form-data",
      "text"
     ]
    },
    "body": {
     "type": "object",
     "properties": {},
     "additionalProperties": false
    }
   },
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "additionalProperties": false
  }
 },
 "required": [
  "input"
 ]
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/bitcoin-mempool-snapshot-0ba388dc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chain.openverbs.com](https://www.zero.xyz/host/chain.openverbs.com/llms.txt)