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FastPath API – Bitcoin Template Batch Check
x402
FastPath API – Bitcoin Template Batch Check is a paid API for AI agents from api.nativebtc.org, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).
Checks whether a batch of Bitcoin transaction IDs are included in the Core v31 optimized mempool template, given a target block confirmation window.
Price / call$0.05
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
Returns a JSON object with a mode field (e.g. 'live_cached'), source identifier (e.g. 'core_v31_optimizer_cache'), a results array where each entry contains the txid and a boolean 'inOptimizedTemplate' flag, an 'included' count, and a 'success' boolean.
Example use cases
Pre-confirmation transaction monitoring
“I just broadcast these 5 Bitcoin transactions — can you check if any of them have made it into the Core v31 optimized block template yet? I'm targeting confirmation within the next 2 blocks. Here are the txids: [txid1, txid2, txid3, txid4, txid5].”
Fee bumping decision support
“Before I decide whether to RBF-bump these transactions, can you check if they're already in the miner's optimized template for the next 6 blocks? Txids are: 81c97a6c5b98a1019095de132727cda868694fb5d92534ebb07e475619e38325 and aabbcc...112233.”
Batch settlement verification for exchange
“We just processed a batch of 10 Bitcoin withdrawals and need to know which ones are included in the Core v31 block template for the next block — can you run a batch check on these txids and tell me how many made it in?”
Technical details
Endpoint
POSThttps://api.nativebtc.org/v1/template/batch-checkWhen to prefer
Use this endpoint when you need to batch-verify whether specific Bitcoin transactions are included in Bitcoin Core v31's optimized block template, particularly when making RBF-bump or fee decisions, verifying settlement batches, or monitoring near-term confirmation likelihood. Prefer this over single-transaction mempool lookups when you have up to 10 txids to check simultaneously. It is distinct from general mempool fee estimation — this specifically checks template inclusion status via the Core v31 optimizer cache.
Side effects
- Invalid txid format (not 64 hex characters) returns a validation error
- Exceeding 10 txids in a single batch returns a schema violation error
- targetBlocks below 1 rejected as invalid
- Payment failure via x402 protocol returns 402 Payment Required
- txid not found in mempool may return inOptimizedTemplate: false without explicit error
- Temporary Core node unavailability may return a non-success response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| txids | array | |
| targetBlocks | number | Desired confirmation target in blocks. |
Output
Schema · Response
{
"type": "json",
"example": {
"mode": "live_cached",
"source": "core_v31_optimizer_cache",
"results": [
{
"txid": "81c97a6c5b98a1019095de132727cda868694fb5d92534ebb07e475619e38325",
"inOptimizedTemplate": true
}
],
"success": true,
"included": 1
}
}Tags
x402
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