# SiteCheck BTC Fees

> SiteCheck BTC Fees is a paid API for AI agents from api.sitecheck-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).

Returns current Bitcoin network fee estimates (sat/vbyte) and mempool statistics, with USD-converted transaction cost examples

## Facts

- Endpoint: GET https://api.sitecheck-api.workers.dev/api/btc/fees?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-btc-fees-bb0af193
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TDhG0kl1CDr2BfPaQAsWX

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 sitecheck-btc-fees-bb0af193
```

Example prompt: What are the current Bitcoin transaction fees — give me the fastest, half-hour, and economy rates in sat/vbyte, and tell me roughly what it would cost in USD to send a typical transaction right now.

## When to prefer this

Choose this endpoint when you need real-time Bitcoin fee estimates with USD cost context in a single pay-per-call request without managing API keys for mempool.space or Coinbase separately. Ideal for agents that need fast fee lookups for Bitcoin transaction planning, wallet UX, or DeFi workflows, especially within an x402 payment-enabled agent stack.

## Known failure modes

- mempool.space upstream unavailable — stale or missing fee data
- Coinbase spot price unavailable — USD conversion fields may be absent or stale
- Network timeout from Cloudflare Worker to upstream
- Unexpected upstream schema change causing partial data

## How this service works

Recommended Bitcoin fees in sat/vB (fastest, 30 minutes, 1 hour, economy, minimum), the mempool's size and count, and what a typical 140 vB transaction costs in BTC and USD. Source: mempool.space; USD from Coinbase spot. Cached 30 seconds. Information only, not financial advice.

## Output

Returns a JSON object with fee rates for fastest, half-hour, hour, economy, and minimum confirmation targets in sat/vbyte; current BTC/USD spot price; mempool statistics (virtual size in MvB, total fees in BTC, transaction count); and a typical 140-vbyte transaction cost breakdown in BTC, sats, and USD for economy and fastest tiers. Includes data source URLs and a disclaimer.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "required": {
   "type": "string"
  },
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "btcUsd": 83345.495,
  "source": "https://mempool.space/api/v1/fees/recommended, https://mempool.space/api/mempool; USD from Coinbase spot",
  "mempool": {
   "vsizeMvB": 39.76,
   "totalFeesBtc": 0.069,
   "transactions": 81442
  },
  "checkedAt": "2026-10-14T07:00:19.757Z",
  "disclaimer": "Information only, not financial advice.",
  "feesSatPerVbyte": {
   "hour": 1,
   "economy": 1,
   "fastest": 2,
   "minimum": 1,
   "halfHour": 1
  },
  "typicalTransaction": {
   "vbytes": 140,
   "atEconomy": {
    "btc": 0.0000014,
    "usd": 0.1167,
    "sats": 140
   },
   "atFastest": {
    "btc": 0.0000028,
    "usd": 0.2334,
    "sats": 280
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-btc-fees-bb0af193/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.sitecheck-api.workers.dev](https://www.zero.xyz/host/api.sitecheck-api.workers.dev/llms.txt)