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FastX402 Bitcoin Fee Rates
x402
FastX402 Bitcoin Fee Rates is a paid API for AI agents from fastx402.tools, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-17).
Returns current Bitcoin network fee rates (sat/vbyte) and mempool statistics for main, testnet3, or testnet4
Price / call$0.003
Success—
StatusUnknown
How this service works
146 pay-per-call tools for AI agents, from $0.001 per request in USDC on Base or Solana with x402. No account, no API key.
Output
A JSON object containing the queried network name, fee rates in sat/vbyte for four confirmation tiers (economy, thirty_minutes, one_hour, fastest), and mempool statistics (total vsize in bytes, transaction count, and total fees in satoshis).
Example use cases
Optimal fee before sending Bitcoin
“Before I send this Bitcoin transaction, what fee rate should I use to get confirmed within 30 minutes on mainnet? Give me the sat/vbyte estimate.”
Mempool congestion dashboard
“How congested is the Bitcoin mainnet mempool right now? I want to know how many transactions are waiting, the total vsize, and the current fee rates.”
Testnet fee check for development
“What are the current fee rates on Bitcoin testnet4 — I need economy and fastest sat/vbyte values for testing my wallet app.”
Technical details
Endpoint
GEThttps://fastx402.tools/btc-fees?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need real-time Bitcoin fee rate data denominated in sat/vbyte with mempool context, and you want a pay-per-call model with no API key or account setup. Especially useful for agents that need occasional fee lookups without committing to a subscription, or for testnet environments. Prefer this over free public mempool APIs when you need reliable, metered access integrated into an x402 payment flow.
Side effects
- Invalid 'network' parameter value returns an error (accepted values: main, testnet3, testnet4)
- Payment not provided or insufficient — returns HTTP 402 Payment Required
- Upstream Bitcoin node or mempool data source unavailable — may return 5xx or stale data
- Rate limiting if payment processing fails
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"mempool": {
"vsize": 30000000,
"transactions": 5000,
"total_fee_sat": 61234567
},
"network": "main",
"fee_rates_sat_vb": {
"economy": 10,
"fastest": 20,
"one_hour": 15,
"thirty_minutes": 17
}
}
}Tags
x402
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