# x402-defi-intel Transaction Simulator

> x402-defi-intel Transaction Simulator is a paid API for AI agents from cryptodefidataintel-production.up.railway.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).

Simulates an EVM transaction on a specified chain before execution to predict success, gas cost, and revert reason

## Facts

- Endpoint: GET https://cryptodefidataintel-production.up.railway.app/api/tx-simulate
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-defi-intel-transaction-simulator-599cc5ed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_l9mXd-K9ksQMEyBD2589m

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-defi-intel-transaction-simulator-599cc5ed
```

Example prompt: Before I send this transaction, simulate it on Base for me — I'm calling contract 0x1234...abcd with calldata 0xa9059cbb...0001 from my wallet 0xabc...def with 0 ETH value — will it succeed or revert, and what will the gas cost be?

## When to prefer this

Use this endpoint when an AI agent needs to pre-flight check an EVM transaction before actual on-chain submission — especially useful for DeFi operations like swaps, approvals, or contract calls where reverts are costly. Prefer over static analysis when you need real-time chain-state simulation with gas estimation and revert reason decoding.

## Known failure modes

- Missing required 'chain' or 'to' parameter returns validation error
- Unsupported chain name causes lookup failure
- Malformed calldata may cause simulation to return revert with cryptic reason
- Node RPC unavailability causes low confidence or error response
- Very new or unverified contract addresses may produce unreliable results

## How this service works

Crypto-agent toolkit: cross-chain DeFi intelligence + execution helpers + retrieval for agents. 16 endpoints: funding, open interest, long/short, token-safety, yield, prices, gas, tx-simulate, approval-check, bridge-quote, governance-search, lending, liquidations, protocol-search, swap-quote, token-resolve. Pay-per-call via x402.

## Output

Returns a signal ('will_succeed' or similar), a human-readable insight string, willRevert boolean, revertReason (if any), gasEstimate in gas units, gasCostEth in ETH, the chain name, confidence score, and data sources used (e.g. public-rpc).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "chain",
      "to"
     ],
     "properties": {
      "to": {
       "type": "string"
      },
      "data": {
       "type": "string"
      },
      "from": {
       "type": "string"
      },
      "chain": {
       "type": "string"
      },
      "value": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {
   "chain": "base",
   "gasCostEth": 9e-7,
   "willRevert": false,
   "gasEstimate": 46000,
   "revertReason": null
  },
  "signal": "will_succeed",
  "insight": "Transaction would SUCCEED against current base state.",
  "sources": [
   "public-rpc"
  ],
  "confidence": 0.85
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-defi-intel-transaction-simulator-599cc5ed/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cryptodefidataintel-production.up.railway.app](https://www.zero.xyz/host/cryptodefidataintel-production.up.railway.app/llms.txt)