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chainquery getmempoolancestors
x402
chainquery getmempoolancestors is a paid API for AI agents from x402.chainquery.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Returns in-mempool ancestor transactions (txids or full entries) for a given unconfirmed Bitcoin transaction via Bitcoin Core RPC
Price / call$0.01
Success—
StatusUnknown
How this service works
chainquery Bitcoin RPC: pay-per-call Bitcoin Core over x402, no API key. In-mempool ancestors of a transaction (txids or full entries) from chainquery's independent full node. Bitcoin Core getmempoolancestors.
Output
Returns a JSON object with the Bitcoin Core getmempoolancestors result: either an array of ancestor txids (verbose=false) or a map of txid to full mempool entry objects including fees, size, weight, descendant/ancestor counts, and dependency info (verbose=true).
Example use cases
Analyze fee rate for RBF replacement
“I need to check the ancestor transactions in the mempool for this unconfirmed tx before I decide whether to replace it — can you pull all the parent transactions and their fee rates so I can calculate what I need to pay?”
Trace stuck transaction dependencies
“This transaction has been pending for hours and I'm not sure why. Can you show me all the in-mempool ancestors for this txid and tell me if any of them are holding it up?”
Validate mempool chain before broadcasting
“Before I broadcast my new transaction, I need to verify that all its parent transactions are still sitting in the mempool — can you pull the full ancestor chain and confirm they're there?”
Technical details
Endpoint
GEThttps://x402.chainquery.com/v1/rpc/getmempoolancestorsWhen to prefer
Use this endpoint when you need to trace the ancestor dependency graph of an unconfirmed Bitcoin transaction in the mempool, especially for fee estimation, RBF analysis, or understanding transaction chains. Prefer over block-explorer APIs when you need raw Bitcoin Core RPC semantics from an independent full node without requiring an API key registration.
Side effects
- Transaction not in mempool (txid confirmed or never seen) — returns RPC error
- Invalid or malformed txid — returns RPC error
- Payment not included or insufficient — HTTP 402 response requiring x402 payment
- Params JSON malformed — query parameter parse error
- Node temporarily unavailable — HTTP 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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