# AgentsToolsHub Live Bitcoin Mempool Fee Estimator

> AgentsToolsHub Live Bitcoin Mempool Fee Estimator is a paid API for AI agents from agentstoolshub.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).

Returns live Bitcoin fee-rate tiers (sat/vB) from mempool.space plus the total fee cost for a transaction of a given size in vBytes.

## Facts

- Endpoint: GET https://agentstoolshub.com/api/v1/live/mempool-fees?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentstoolshub-live-bitcoin-mempool-fee-estimator-d734ea63
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MN35Xh2yEALh06Phv3otk

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 agentstoolshub-live-bitcoin-mempool-fee-estimator-d734ea63
```

Example prompt: What are the current Bitcoin fee tiers right now — fastest, 30-min, 1-hour, economy, and minimum sat/vB — and how much would it cost in total fees for a standard 140 vByte transaction?

## When to prefer this

Use this endpoint when an agent needs real-time Bitcoin fee-rate recommendations sourced directly from mempool.space, especially when it also needs to compute the absolute satoshi cost for a specific transaction size before broadcasting. Prefer this over static fee tables or hardcoded defaults whenever the mempool is volatile.

## Known failure modes

- mempool.space upstream unavailable — returns an error indicating the data source is unreachable
- Invalid or missing txSize type — returns a validation error if txSize is not a number
- Rate limit or payment failure — returns 402 if the $0.02 USDC per-call fee is not settled

## How this service works

Live Bitcoin fee market from mempool.space: recommended sat/vB tiers (fastest / 30 min / 1 hour / economy / minimum), unconfirmed-transaction backlog, and the total fee cost for your transaction's size in vBytes. No more guessing sats before broadcasting. Use this when an agent needs to live sat/vB fee tiers + cost for your tx size.

## Output

Returns recommended fee rates in sat/vB across five tiers (fastest, ~30 min, ~1 hour, economy, minimum), the number of unconfirmed transactions in the mempool backlog, and — if txSize is provided — the calculated total fee in satoshis for that transaction size.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "txSize": {
       "type": "number",
       "description": "Simple transfer ≈ 140 vBytes"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentstoolshub-live-bitcoin-mempool-fee-estimator-d734ea63/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentstoolshub.com](https://www.zero.xyz/host/agentstoolshub.com/llms.txt)