# Solana Signer & Writable Account Analyzer

> Solana Signer & Writable Account Analyzer is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Analyzes a Solana transaction or account list to classify each account as signer, writable, or read-only, with counts and warnings for edge cases like ALT-loaded accounts.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/solana_signer_writable_analyze/invoke
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/solana-signer-writable-account-analyzer-0a27407b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QUskRWekCZD9OjeIwtSGS

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability solana-signer-writable-account-analyzer-0a27407b -d '<json body>'
```

Example prompt: Analyze this Solana transaction JSON and tell me which accounts are signers, which are writable, and which are read-only, along with any warnings: {paste your transaction JSON here}.

## When to prefer this

Choose this endpoint when you need programmatic, per-account classification of Solana transaction accounts into signer/writable/read-only roles — especially useful before transaction submission, during smart contract auditing, or when debugging address lookup table (ALT) account issues. It is a lightweight, stateless analysis that does not broadcast or simulate the transaction.

## Known failure modes

- Malformed or non-parseable request_json returns an error
- Empty or too-short JSON input rejected by minLength constraint
- Oversized payload rejected by maxLength 65536 limit
- Ambiguous ALT account state triggers warnings rather than hard errors
- Non-Solana transaction format may produce incorrect or empty classifications

## How this service works

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## Output

Returns a structured JSON analysis with a list of accounts (each with index, pubkey, is_signer, and is_writable flags), plus aggregate counts for signers, writable accounts, and read-only accounts, along with any warnings (e.g. ALT accounts needing explicit classification) and the analyzed network identifier.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "request_json": {
   "type": "string",
   "maxLength": 65536,
   "minLength": 2
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "warnings": [
    "Loaded ALT accounts require explicit writable/read-only classification."
   ],
   "service_id": "solana_signer_writable_analyze",
   "analysis_json": "{\"accounts\":[{\"index\":0,\"is_signer\":true,\"is_writable\":true,\"pubkey\":\"11111111111111111111111111111111\"},{\"index\":1,\"is_signer\":false,\"is_writable\":false,\"pubkey\":\"TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA\"}],\"readonly_count\":1,\"signer_count\":1,\"writable_count\":1}",
   "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_signer_writable_analyze",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "10000",
   "resultSha256": "41c19b8df4e0dbce500d172bc61d75a1eca9b753ed85e8823c0f1e50b91e616d",
   "serviceVersion": "1.0.0",
   "settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
  },
  "artifacts": [],
  "requestId": "example-request",
  "executionId": "example-execution"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/solana-signer-writable-account-analyzer-0a27407b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from signalharness.ai](https://www.zero.xyz/host/signalharness.ai/llms.txt)