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ScanPay Transaction Preflight Simulator
x402
ScanPay Transaction Preflight Simulator is a paid API for AI agents from scanpay-ob3w.onrender.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-31).
Simulates and security-scans a blockchain transaction before broadcast, returning a risk verdict and findings for Base, Ethereum, or Solana chains
Price / call$0.05
Success—
StatusUnknown
How this service works
Deterministic AST code security scanner with x402 Solana micropayments, remote MCP, and ERC-8183 Evaluator oracle.
Output
A JSON object containing a list of security findings (empty if none), an execution_gate object with a verdict string (ALLOW or DENY), a numeric risk_score, and a boolean allow_broadcast indicating whether the transaction is safe to broadcast.
Example use cases
DeFi swap safety check
“I'm about to approve a token swap on Ethereum — here's the transaction object with the contract address and calldata. Can you run a preflight security scan and tell me if there are any findings or if the verdict is ALLOW?”
Solana instruction audit before signing
“I have a set of Solana instructions from a dApp I don't fully trust. Simulate them through the security scanner and tell me the risk score before I sign anything.”
Agent auto-gating risky transactions
“My agent is about to broadcast a Base transaction on my behalf — check it against the preflight oracle first and only proceed if the allow_broadcast flag comes back true and the risk score is zero.”
Technical details
Endpoint
POSThttps://scanpay-ob3w.onrender.com/v2/preflight/simulate?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent or wallet needs a deterministic, pre-broadcast safety gate for blockchain transactions on Base, Ethereum, or Solana. It is especially valuable when automating transactions where a human is not reviewing the calldata in real time, or when interacting with unfamiliar smart contracts. Prefer this over generic RPC simulation when you need an explicit security verdict and risk score, not just execution trace output.
Side effects
- Missing required 'tx' or 'chain' field returns a validation error
- Unsupported chain value returns an error (only 'base', 'ethereum', 'solana' accepted)
- Malformed transaction object may result in simulation failure or partial analysis
- Payment not included or insufficient USDC triggers 402 payment required response
- Service unavailable on Render cold-start may cause timeout or 502 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| txrequired | object | Transaction object ({to, data, value} or {instructions}) |
| chainrequired | string | Target chain: 'base', 'ethereum', or 'solana' |
Output
Schema · Response
{
"type": "json",
"example": {
"findings": [],
"execution_gate": {
"verdict": "ALLOW",
"risk_score": 0,
"allow_broadcast": true
}
}
}Tags
x402
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