# LogicNodes Aptos Transaction Simulate

> LogicNodes Aptos Transaction Simulate is a paid API for AI agents from logicnodes.io, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-28).

Simulates an Aptos Move function call to predict gas usage and outcome before submitting it on-chain

## Facts

- Endpoint: POST https://logicnodes.io/paid/v1/tools/aptos_tx_simulate?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/logicnodes-aptos-transaction-simulate-cc494a1e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_n7Dc8fyXO35d6k2r5GQgL

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 logicnodes-aptos-transaction-simulate-cc494a1e -d '<json body>'
```

Example prompt: Simulate an Aptos mainnet transaction where sender 0xabc123...def sends to the 0x1::coin::transfer function with arguments ["0xrecipient", 1000000] — tell me if it will succeed and how much gas it will use.

## When to prefer this

Use this endpoint when you need to pre-validate an Aptos Move function call before committing a real transaction — especially useful for estimating gas, catching VM errors early, testing contract logic on testnet, or building reliable agent workflows that must not waste APT on failed transactions. Prefer this over direct submission when transaction success is uncertain or when optimizing gas parameters.

## Known failure modes

- Invalid sender address format returns error
- Nonexistent Move function identifier causes simulation failure
- Insufficient sequence number mismatch leads to rejection
- Invalid type arguments produce Move VM type error
- Chain ID not recognized (must be aptos:1 or aptos:2)
- Network connectivity issues to Aptos node return 5xx
- Payment not included or insufficient USDC causes 402 rejection

## How this service works

Exact answers for AI agents: 40+ tools for EVM chains and Aptos, gas on 14 chains, never a guess. Free tier; pay per call in USDC (x402) on 13 networks.

## Output

Returns a JSON object with an 'ok' boolean and the tool name, along with simulation details including predicted gas consumption, VM status, and whether the transaction would succeed or fail if submitted — without actually executing anything on-chain.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain": {
   "type": "string",
   "description": "Aptos CAIP-2 id: aptos:1 (mainnet, default) or aptos:2 (testnet)"
  },
  "sender": {
   "type": "string"
  },
  "function": {
   "type": "string"
  },
  "arguments": {
   "type": "array",
   "items": {}
  },
  "gasUnitPrice": {
   "anyOf": [
    {
     "type": "string"
    },
    {
     "type": "integer",
     "maximum": 9007199254740991,
     "minimum": 0
    }
   ]
  },
  "maxGasAmount": {
   "anyOf": [
    {
     "type": "string"
    },
    {
     "type": "integer",
     "maximum": 9007199254740991,
     "minimum": 0
    }
   ]
  },
  "typeArguments": {
   "type": "array",
   "items": {
    "type": "string"
   }
  },
  "sequenceNumber": {
   "anyOf": [
    {
     "type": "string"
    },
    {
     "type": "integer",
     "maximum": 9007199254740991,
     "minimum": 0
    }
   ]
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "tool": "aptos_tx_simulate"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/logicnodes-aptos-transaction-simulate-cc494a1e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from logicnodes.io](https://www.zero.xyz/host/logicnodes.io/llms.txt)