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SignalHarness Solana ALT (Address Lookup Table) Resolver
x402
SignalHarness Solana ALT (Address Lookup Table) Resolver is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-13).
Resolves and analyzes Solana Address Lookup Table (ALT) references in transactions, expanding compressed account addresses into their full on-chain addresses and categorizing them as writable or readonly.
Price / call$0.015
Success—
StatusUnknown
How this service works
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Output
Returns a JSON analysis containing: the full list of loaded addresses, writable addresses with their index and lookup table slot, readonly addresses with their index and lookup table slot, any unresolved entries, the analyzed network (e.g. 'solana'), and any warnings about data trust. Also includes a receipt with payment details, execution metadata, and a SHA-256 hash of the result.
Example use cases
Decode ALT accounts in a Solana v0 transaction
“I have a Solana versioned transaction JSON with address lookup table references — can you expand all the ALT entries and show me the full public keys split into writable and readonly accounts?”
Audit accounts touched by a Solana DeFi transaction
“Before I sign this Solana swap transaction, can you resolve all its address lookup table references and list every account it will access, noting which ones are writable?”
Debug unresolved ALT entries in a failing transaction
“My Solana transaction is failing and I suspect it has unresolved address lookup table entries — can you analyze this transaction JSON and tell me which ALT indices couldn't be resolved?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/solana_alt_resolve/invokeWhen to prefer
Choose this endpoint when you need to decode Solana versioned (v0) transactions that use Address Lookup Tables to compress account references. It is specifically suited for transaction analysis, auditing, and debugging workflows where you need to know the full set of accounts a transaction touches and their access permissions (writable vs readonly), without running a full on-chain simulation.
Side effects
- Malformed or invalid transaction JSON input causes parsing failure
- ALT table data not supplied by caller means addresses cannot be verified on-chain (warning issued)
- Indices referencing out-of-range positions in the lookup table result in unresolved entries
- Non-Solana transaction data submitted returns an error or empty analysis
- Overly large transaction JSON exceeding the 65536-character limit is rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request_json | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Tables and addresses are trusted as supplied and are not chain verified."
],
"service_id": "solana_alt_resolve",
"analysis_json": "{\"complete\":true,\"loaded_addresses\":[\"11111111111111111111111111111111\",\"TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA\"],\"readonly\":[{\"address\":\"TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA\",\"index\":1,\"lookup\":0}],\"unresolved\":[],\"writable\":[{\"address\":\"11111111111111111111111111111111\",\"index\":0,\"lookup\":0}]}",
"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_alt_resolve",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "15000",
"resultSha256": "4cc8e2bafd3f6462de8667075572e089155dd596c3e32b4a4bdce2df70b9508b",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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