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BTC Tx Toolkit – PSBT Analyzer
x402
BTC Tx Toolkit – PSBT Analyzer is a paid API for AI agents from btc-tx-toolkit.stackstats.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-12).
Decodes and analyzes a Bitcoin PSBT (Partially Signed Bitcoin Transaction) to return fee, feerate, vsize, change outputs, RBF signaling, dust detection, and warnings — without broadcasting or storing anything.
Price / call$0.005
Success—
StatusUnknown
How this service works
Bitcoin transaction decoder, PSBT analyzer and address validator API. Pay-per-call in USDC via x402. Read-only: nothing is broadcast, logged or stored.
Output
Returns a JSON object with: ok (boolean), vsize (virtual transaction size in bytes), fee_sat (total fee in satoshis), feerate_sat_vb (fee rate in sat/vbyte), change object (output indices, count, and total value in satoshis), rbf_signaled (boolean), dust_outputs (array of outputs below dust threshold), and warnings (array of human-readable alert strings).
Example use cases
Pre-signing fee sanity check
“Before I sign this PSBT, can you decode it and tell me the fee in satoshis, the feerate in sat/vbyte, and whether the fee looks reasonable? Here's the base64 PSBT on mainnet: cHNidP8BAH...”
Dust and warning audit for wallet dev
“I'm building a wallet and need to check this PSBT on testnet for any dust outputs or warnings before presenting it to the user — can you analyze it and flag anything suspicious? PSBT: 70736274ff...”
Change output verification before hardware signing
“I want to confirm the change output count and value in satoshis on this mainnet PSBT before I send it to my hardware wallet to sign — can you decode and analyze it? PSBT: cHNidP8BAH...”
Technical details
Endpoint
POSThttps://btc-tx-toolkit.stackstats.workers.dev/psbt/analyze?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a read-only, privacy-preserving analysis of a PSBT before signing or broadcasting — especially when fee sanity checking, dust detection, RBF verification, or change output inspection is needed. Prefer it over full-node RPC calls when you don't control a node, or over explorers when the transaction hasn't been broadcast yet and must remain private. Ideal for wallet UIs, signing flows, and agent-driven transaction review pipelines.
Side effects
- Invalid or malformed PSBT string returns an error with ok:false
- Unsupported network value causes a validation error
- Very large PSBTs may exceed payload limits
- Missing psbt field in request body returns a 400-level error
- Malformed base64 or hex encoding causes a parse failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| psbt | string | PSBT, base64 or hex |
| network | string |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"vsize": 141,
"change": {
"count": 1,
"outputs": [
1
],
"value_sat": 50000
},
"fee_sat": 1410,
"warnings": [],
"dust_outputs": [],
"rbf_signaled": true,
"feerate_sat_vb": 10
}
}Tags
x402
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