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Agent402 SQL Certificate Verifier
x402
Agent402 SQL Certificate Verifier is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Verifies a cryptographic SQL certificate (issued by sql-guard) to confirm it covers a specific SQL statement and was issued by a trusted key
Price / call$0.001
Success—
StatusUnknown
How this service works
Verify an Ed25519 execution certificate against the exact SQL statement you are about to run - the gate your database layer calls before it obeys an agent. Checks the signature, the certificate version, the expiry, and that the statement's SHA-256 matches the one certified, so a certificate for a different (or edited) statement is rejected. Returns { valid, reason, payload } and never throws on a malformed token, so the executor always gets one uniform answer.
Output
Returns a JSON object with a 'valid' boolean indicating whether the certificate is authentic and covers the provided SQL statement, a 'reason' field (null on success or an error message on failure), and a 'payload' object containing the certificate version, expiry timestamp, SHA-256 hash of the SQL, and the original verdict (e.g. 'pass').
Example use cases
Pre-execution SQL integrity check
“Before my agent runs this SQL query against the database, verify that the sql-guard certificate 'eyJv1...' actually covers the statement 'SELECT balance FROM accounts WHERE id = 101' and hasn't been tampered with.”
Auditing certified queries in a pipeline
“I have a pipeline that receives SQL statements with attached certificates. Can you verify that this certificate payload 'sig_abc123' is valid for the statement 'INSERT INTO logs VALUES (?, ?, ?)' and was signed by this PEM public key?”
Preventing SQL injection via certificate validation
“My app only wants to run SQL that has a valid sql-guard certificate. Check whether this certificate token 'payload.sig_xyz' legitimately covers the query 'DELETE FROM sessions WHERE expired = true' before I allow it to execute.”
Technical details
Endpoint
POSThttps://agent402.tools/api/sql-cert-verifyWhen to prefer
Use this endpoint when you need to cryptographically verify that a SQL statement has been pre-approved and certified by a sql-guard certificate before executing it — especially in agentic pipelines where untrusted SQL needs to be authenticated. Prefer this over manual hash-checking when the certificate was issued by sql-guard and you need to confirm both integrity and issuer trust. Ideal for zero-trust database access patterns where the wallet is the identity and no API key is needed.
Side effects
- Certificate does not match the provided SQL statement — valid: false with reason explaining the mismatch
- Expired certificate — payload.exp is in the past, valid: false
- Invalid PEM public key format — error parsing the provided publicKey
- Malformed or tampered certificate token — signature verification fails, valid: false
- Missing required field (sql or certificate) — request rejected with validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| sql | string | the exact statement the certificate should cover |
| publicKey | string | PEM public key of the issuer (default: this deployment's) |
| certificate | string | the token from sql-guard (payload.signature) |
Output
Schema · Response
{
"type": "json",
"example": {
"valid": true,
"reason": null,
"payload": {
"v": 1,
"exp": 4070908800,
"sha256": "635cf20a…",
"verdict": "pass"
}
}
}Tags
x402
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