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SiteCheck BTC Fees
x402
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
Price / call$0.002
Success—
StatusUnknown
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.
Example use cases
Timing a low-cost BTC transfer
“I want to send some Bitcoin but I don't want to overpay on fees — what's the cheapest fee rate I can use right now and still get confirmed within an hour, and how much will that cost me in dollars?”
Checking mempool before a crypto payment
“Before I send out this Bitcoin payment, can you check if the mempool is congested and what the fastest fee is so I know it'll confirm quickly?”
Displaying live BTC fees in a wallet app
“Pull the latest Bitcoin fee recommendations — fastest, half-hour, and economy sat/vbyte rates — along with current mempool size so I can display them to the user.”
Technical details
Endpoint
GEThttps://api.sitecheck-api.workers.dev/api/btc/fees?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| required | string | |
| properties | string |
Output
Schema · Response
{
"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
}
}
}
}Tags
x402
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