# x402 Agent Wallet Tools – Transaction Simulation Summary

> 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.

## Facts

- Endpoint: POST https://x402-wallet.558686.xyz/v1/tools/transaction-simulation-summary
- Price: $0.012/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-agent-wallet-tools-transaction-simulation-summary-d825de2a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ARJSVuMnOAjEROWTxKJm_

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 x402-agent-wallet-tools-transaction-simulation-summary-d825de2a -d '<json body>'
```

Example prompt: Before I approve this transaction, analyze the simulation result for me: it succeeded, used 21000 gas, and the only asset change is USDC going down by 0.01 — give me a plain-English summary of what it does, the risk level, and any safety findings.

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Response schema (JSON Schema)

```json
{
 "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
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-agent-wallet-tools-transaction-simulation-summary-d825de2a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-wallet.558686.xyz](https://www.zero.xyz/host/x402-wallet.558686.xyz/llms.txt)