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FastPath API – Bitcoin Mempool Stats
x402
FastPath API – Bitcoin Mempool Stats is a paid API for AI agents from api.nativebtc.org, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Returns current Bitcoin mempool statistics including size, fee estimates by time horizon, RBF status, and network congestion level.
Price / call$0.001
Success—
StatusUnknown
How this service works
FastPath translates Ethereum-style JSON-RPC requests into Bitcoin data, fee intelligence, mempool insight, and Core v31 package signals. Paid by x402.
Output
A JSON object containing: fee estimates in sat/vB for next block, 6-block, and 1-day horizons; current mempool size in bytes; a boolean indicating whether full-RBF is enabled; a congestion label (e.g. 'medium'); and a success flag.
Example use cases
Optimal fee selection before sending BTC
“I'm about to send a Bitcoin transaction — what fee rate should I use if I want it confirmed in the next block, and how congested is the mempool right now?”
Mempool congestion monitoring for an exchange
“Check the Bitcoin mempool stats and tell me if the network is congested — I need the current size, congestion level, and whether full-RBF is active.”
Fee-sensitive wallet advice
“What's the cheapest fee I can pay to get my Bitcoin transaction confirmed within 24 hours, and what's the current mempool size?”
Technical details
Endpoint
GEThttps://api.nativebtc.org/v1/mempool/statsWhen to prefer
Use this endpoint when you need real-time Bitcoin mempool statistics — especially fee estimates across multiple confirmation-time horizons and a congestion signal — without running your own Bitcoin node. It is particularly suited for Ethereum-ecosystem developers already familiar with JSON-RPC conventions who want Bitcoin data in a compatible format. Prefer this over raw mempool.space or Bitcoin Core RPC if you want a unified, metered, pay-per-call API with congestion labeling included.
Side effects
- Service unavailable (upstream Bitcoin node unreachable) — returns error or non-200 status
- Payment not settled (x402 micropayment rejected) — returns 402 Payment Required
- Rate limiting if too many requests are made in a short window
- Stale data if the underlying node is syncing or lagging
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"fees": {
"day": 1,
"nextBlock": 2,
"sixBlocks": 1
},
"size": 33741,
"fullrbf": true,
"success": true,
"congestion": "medium"
}
}Tags
x402
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