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x402 Agent Wallet Tools – Transaction Simulation Summary
x402
x402 Agent Wallet Tools – Transaction Simulation Summary is a paid API for AI agents from x402-wallet.558686.xyz, paid per call via x402, $0.012/call, status unknown (last checked 2026-09-13).
Analyzes a blockchain transaction simulation result and returns a human-readable summary, risk level, asset change breakdown, and safety findings for an AI agent's review before broadcasting.
Price / call$0.012
Success—
StatusUnknown
How this service works
A buyer-side control console for signature risk, EIP-712 review, transaction decoding, ERC20 allowance risk, Permit/Permit2 approvals, transaction simulation summaries, spend guard policy, receipt gate enforcement, and private-key boundaries.
Output
Returns a JSON object with: a human-readable summary of the transaction's effect, a list of findings (potential risks or anomalies), a risk level string (e.g. low/medium/high), a boolean indicating whether the transaction was/should be broadcast, and a parsed array of asset changes showing each token and its net delta.
Example use cases
Pre-broadcast DeFi swap risk check
“I'm about to send a swap transaction. The simulation shows status 'success', 42000 gas used, and asset changes of ETH -0.5 and USDC +900. Summarize what this transaction will do and tell me the risk level before I approve it.”
Detecting unexpected token drain
“Check this simulation result for me — status is 'success', gas is 85000, and it shows WBTC decreasing by 0.1 and some unknown token increasing by 5000. Is this safe? Flag anything suspicious in the asset changes.”
Agent auto-approval policy enforcement
“My spending policy says I should only auto-approve low-risk transactions. This simulation has status 'success', 21000 gas, and a USDC delta of -0.012. What's the risk level and summary so I can decide whether to broadcast it automatically?”
Technical details
Endpoint
POSThttps://x402-wallet.558686.xyz/v1/tools/transaction-simulation-summaryWhen to prefer
Choose this endpoint when an AI agent has received a raw transaction simulation result (e.g. from a node RPC or simulation service) and needs a structured safety assessment and plain-English summary before deciding whether to sign or broadcast. It is ideal for agent-controlled wallets enforcing spend guard policies, ERC20 allowance review, or any pre-broadcast risk gate. Prefer it over generic transaction decoders when you also need a risk level classification and findings list in a single call.
Side effects
- Missing required simulation fields (status, gasUsed, assetChanges) returns a validation error
- Malformed asset change entries (missing 'asset' or 'delta') may produce incomplete findings
- Unknown or exotic asset symbols may not be decoded and appear as raw addresses
- Simulation status other than 'success' (e.g. 'revert') may limit the summary detail
- Service unavailability returns a non-200 HTTP error with no result object
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"tool": "transaction-simulation-summary",
"input": {
"simulation": {
"status": "success",
"gasUsed": 21000,
"assetChanges": [
{
"asset": "USDC",
"delta": "-0.01"
}
]
}
},
"route": "/v1/tools/transaction-simulation-summary",
"result": {
"summary": {},
"findings": [],
"riskLevel": "riskLevel_example",
"broadcasted": true,
"assetChanges": []
},
"project": "x402-agent-wallet-tools",
"deterministic": true
}
}Tags
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