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FastPath API – Bitcoin Data via Ethereum JSON-RPC
x402
FastPath API – Bitcoin Data via Ethereum JSON-RPC is a paid API for AI agents from api.nativebtc.org, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Translates Ethereum-style JSON-RPC requests into Bitcoin blockchain data, fee estimates, mempool insights, and Bitcoin Core v31 package signals.
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-RPC 2.0 response object containing fee ladder tiers (cheap, normal, urgent) each with sat/vB rate and target confirmation blocks, sourced from Bitcoin Core v31 optimizer cache, plus any additional Bitcoin data (block height, mempool state, transaction info) depending on the method called.
Example use cases
Optimal fee for urgent Bitcoin send
“I need to send Bitcoin right now and it has to confirm in the next block — what's the urgent sat/vB fee I should use according to FastPath's fee ladder?”
Mempool congestion check before batching
“Before I batch a bunch of low-priority Bitcoin payouts, can you pull the current mempool state and cheap fee tier from FastPath so I can decide whether to wait or proceed?”
Bitcoin block height via Ethereum-style RPC
“Call eth_blockNumber on FastPath and tell me the current Bitcoin block height so I can verify my node is synced.”
Technical details
Endpoint
POSThttps://api.nativebtc.org/v1/rpcWhen to prefer
Choose this endpoint when you need Bitcoin fee intelligence or mempool data but your agent stack is already wired for Ethereum JSON-RPC — FastPath lets you reuse existing eth_ method plumbing to get Bitcoin data without building a separate Bitcoin RPC client. Particularly useful for developers familiar with eth_blockNumber and eth_getBalance patterns who want Bitcoin Core v31 fee signals without learning a new protocol.
Side effects
- Invalid method name returns JSON-RPC error with code -32601 (method not found)
- Malformed params array returns -32602 (invalid params)
- Payment failure or insufficient USDC balance returns HTTP 402 before processing
- Bitcoin Core backend unavailable returns -32603 (internal error)
- Unsupported Ethereum method with no Bitcoin equivalent returns error response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| id | — | Client-selected JSON-RPC request id. |
| method | string | Ethereum-style method or FastPath method, for example eth_blockNumber, eth_getBalance, fastpath_feeLadder, or fastpath_bitcoinInsight. |
| params | array | JSON-RPC params for the selected method. |
| jsonrpc | string |
Output
Schema · Response
{
"type": "json",
"example": {
"id": 1,
"result": {
"cheap": {
"satVb": 1,
"targetBlocks": 144
},
"normal": {
"satVb": 1,
"targetBlocks": 6
},
"source": "core_v31_optimizer_cache",
"urgent": {
"satVb": 2,
"targetBlocks": 1
}
},
"jsonrpc": "2.0"
}
}Tags
x402
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