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Solana Durable Nonce Inspector
x402
Solana Durable Nonce Inspector is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-15).
Analyzes a Solana transaction's durable nonce usage, checking whether the advance-nonce instruction is present, correctly placed, and whether the nonce matches the transaction blockhash.
Price / call$0.015
Success—
StatusUnknown
How this service works
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Output
Returns a structured analysis including: whether the nonce matches the transaction blockhash, the index of the advance nonce instruction (-1 if absent), the nonce authority pubkey, the nonce account pubkey, whether advance-first ordering is satisfied, and an array of warnings (e.g. missing advance nonce instruction). Also indicates the analyzed network (solana) and evidence scope (caller-supplied data).
Example use cases
Debug failing durable nonce transaction
“I have a Solana transaction that keeps getting rejected and I think it's a durable nonce issue — can you inspect this transaction JSON and tell me if the advance nonce instruction is missing or in the wrong position?”
Pre-flight nonce validation before broadcast
“Before I submit this Solana transaction to the network, can you check that the durable nonce is configured correctly, the authority matches, and the nonce lines up with the blockhash field?”
Audit transaction structure for nonce compliance
“I'm building a Solana wallet and want to verify that the transactions my users generate always have a valid advance nonce instruction in the right place — can you analyze this sample transaction JSON and tell me what warnings come up?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/solana_durable_nonce_inspect/invokeWhen to prefer
Use this endpoint when you need to programmatically validate Solana durable nonce transactions before broadcasting, debug nonce-related rejection errors, or audit transaction structure in a CI/automated pipeline. It is purely static analysis on caller-supplied data — it does not make RPC calls to the Solana network, so it is fast and cheap ($0.015 USDC) but cannot verify on-chain nonce state or account balances.
Side effects
- Malformed or invalid transaction JSON causes parsing failure
- Nonce account address is the system default (all zeros) when not properly set
- advance_instruction_index returns -1 if no advance nonce instruction is present
- Does not query on-chain nonce freshness or reserve balance — warnings included in response
- Input JSON exceeding 65536 characters will be rejected
- Incomplete transaction structure may result in null blockhash and false nonce match
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request_json | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Does not query nonce freshness or reserve balance."
],
"service_id": "solana_durable_nonce_inspect",
"analysis_json": "{\"advance_first\":false,\"advance_instruction_index\":-1,\"authority\":\"11111111111111111111111111111111\",\"nonce\":\"11111111111111111111111111111111\",\"nonce_matches_blockhash\":false,\"transaction_blockhash\":null,\"warnings\":[\"advance nonce instruction not supplied\"]}",
"evidence_scope": "caller_supplied_data",
"analyzed_network": "solana"
},
"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": "solana_durable_nonce_inspect",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "15000",
"resultSha256": "b29cd4ef5dc21593e7b53382c68a452a6188821fe43674bc4036d6b1d8220b23",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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