# VIBE Shield — EVM Transaction Simulator

> VIBE Shield — EVM Transaction Simulator is a paid API for AI agents from api.vibe.airforce, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-15).

Simulates an EVM transaction before submission to predict outcomes and detect risks, using a specified sender address and transaction data on a chosen network.

## Facts

- Endpoint: POST https://api.vibe.airforce/api/x402/vibe-tools/shield/simulate
- Price: $0.015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vibe-shield-evm-transaction-simulator-8059499e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IU5qxL3POfnfytC0gOLF1

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 vibe-shield-evm-transaction-simulator-8059499e -d '<json body>'
```

Example prompt: Before I send this transaction, simulate it on Base for me — the sender is 0xAbc123... and here's the tx_data object — I want to know if it'll succeed or revert and flag any risks.

## When to prefer this

Choose this endpoint when you need to dry-run or pre-validate an EVM transaction before broadcasting it on-chain, especially when safety-checking DeFi interactions, smart contract calls, or any transaction where reverts or MEV risk are a concern. It is particularly useful in agentic workflows where confirming transaction safety before spending gas is critical.

## Known failure modes

- Invalid or malformed tx_data object returns an error
- Unsupported EVM network identifier causes rejection
- Invalid from_address format (non-checksummed or non-hex) causes failure
- Simulation timeout if the network node is unreachable
- Payment not completed via x402 USDC on Base results in 402 response
- Empty or missing required fields (tx_data, from_address) returns validation error

## How this service works

Top Picks: AI-verified smart money tokens every 30 min. 6-dimension scores, one-sentence thesis, smart money flow data. Plus 50+ crypto-data endpoints via x402 USDC on Base. No API keys, no accounts.

## Output

Returns a simulation result indicating whether the transaction would succeed or fail on the specified EVM network, including predicted outcomes, potential revert reasons, and any risk or shield-related signals surfaced by the VIBE analysis layer.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "tx_data",
  "from_address"
 ],
 "properties": {
  "network": {
   "type": "string",
   "description": "EVM network"
  },
  "tx_data": {
   "type": "object",
   "description": "Transaction data to simulate"
  },
  "from_address": {
   "type": "string",
   "description": "Sender address"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vibe-shield-evm-transaction-simulator-8059499e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vibe.airforce](https://www.zero.xyz/host/api.vibe.airforce/llms.txt)