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TxGuard x402 Base API – Pre-Signing Transaction Risk Simulation
x402
TxGuard x402 Base API – Pre-Signing Transaction Risk Simulation is a paid API for AI agents from 50-7-41-26.sslip.io, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-15).
Performs fail-closed pre-signing risk inspection of blockchain transactions, flagging dangerous or suspicious activity before any signing or broadcasting occurs.
Price / call$0.1
Success—
StatusUnknown
How this service works
Fail-closed pre-signing risk inspection. This service never signs, broadcasts, or bridges assets.
Output
Returns a risk inspection result indicating whether the transaction is safe or should be blocked (fail-closed), along with identified threat categories, a risk score, and human-readable reasons explaining any flagged risks. No signing, broadcasting, or asset movement occurs.
Example use cases
DeFi swap safety check
“I'm about to approve a Uniswap swap on Base — can you run a pre-signing risk inspection on this transaction calldata to make sure there's nothing malicious before I sign?”
NFT contract interaction screening
“Before I sign this NFT mint transaction on Base with contract 0xDead...Beef, can you simulate it through TxGuard and tell me if there are any red flags or risk factors I should know about?”
Unknown contract address vetting
“Someone sent me a transaction request involving a contract I don't recognize on Base — can you do a fail-closed risk check on it before I approve anything, and tell me if it looks like a drainer or scam?”
Technical details
Endpoint
POSThttps://50-7-41-26.sslip.io/v1/simulateWhen to prefer
Choose this endpoint when you need a fail-closed pre-signing safety gate for transactions on Base before any wallet signs or broadcasts them. Ideal for agents managing wallets autonomously, DeFi workflows requiring human-in-the-loop risk gates, or any scenario where executing a malicious transaction would be catastrophic. Prefer this over general blockchain simulation tools when security and risk-flagging — not just execution simulation — is the primary concern.
Side effects
- Malformed or incomplete transaction payload returns a 400-level error
- Unknown or unsupported chain/network returns an error
- Service unavailable or timeout results in fail-closed rejection by default
- Payment not included or insufficient USDC results in 402 Payment Required
- Ambiguous calldata may result in incomplete risk analysis with lower confidence
Tags
x402
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