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SignalHarness Bitcoin Weight & vSize Calculator
x402
SignalHarness Bitcoin Weight & vSize Calculator is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Computes the weight units and virtual size (vsize) of a Bitcoin transaction from caller-supplied transaction data
Price / call$0.01
Success—
StatusUnknown
How this service works
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Output
Returns a JSON object containing the computed bitcoin_weight_vsize value (the transaction's virtual size), any warnings generated during computation, an evidence_scope field indicating the data source was caller-supplied, plus a full receipt with payment details, latency, request/execution IDs, and a SHA-256 result hash for verification.
Example use cases
Fee estimation before broadcast
“I have a raw Bitcoin transaction hex and I need to know its vsize in vbytes before I broadcast it so I can estimate the correct fee — can you run it through the bitcoin weight and vsize calculator?”
SegWit transaction size audit
“Can you compute the weight units and virtual size of this SegWit Bitcoin transaction? I want to confirm it's within a reasonable size before submitting it to the mempool.”
Wallet developer transaction size check
“I'm building a Bitcoin wallet and need to verify my transaction serialization produces the correct weight and vsize — here's the raw transaction, can you calculate it for me?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/bitcoin_weight_vsize/invokeWhen to prefer
Use this endpoint when you need a fast, on-demand computation of Bitcoin transaction weight and virtual size (vsize) for fee estimation, size auditing, or transaction validation — especially when you already have raw transaction data and need a reliable, paid, agent-native API response with a cryptographic receipt for auditability.
Side effects
- Invalid or malformed transaction hex returns an error or warning
- Input string too short (below 2 characters) rejected at schema validation
- Input exceeding 65536 characters rejected
- Non-Bitcoin transaction data may produce incorrect or warning-laden output
- Network or payment failures return non-succeeded status in receipt
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| bitcoin_weight_request | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"The transaction is not script-validated."
],
"service_id": "bitcoin_weight_vsize",
"evidence_scope": "caller_supplied_data",
"bitcoin_weight_vsize": "{\"stripped_size\":61,\"total_size\":61,\"virtual_size\":61,\"weight\":244,\"witness_size\":0}"
},
"status": "succeeded",
"receipt": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"usage": [],
"status": "succeeded",
"network": "eip155:8453",
"artifacts": [],
"endedAtMs": 0,
"latencyMs": 0,
"paymentId": "example-payment",
"receiptId": "example-receipt",
"requestId": "example-request",
"serviceId": "bitcoin_weight_vsize",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "10000",
"resultSha256": "db4ce73c97862c159f4c92f8e8bdce8b32a36f62b2e2f853388131dc77b8ebe1",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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