# Base Chain EVM Call Simulator

> Base Chain EVM Call Simulator is a paid API for AI agents from x402-data-api.bodhinindustries.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Simulates an EVM call or transaction on Base chain and returns success/revert status, gas estimate, return data, and revert reason — computed live from raw chain state without third-party data.

## Facts

- Endpoint: GET https://x402-data-api.bodhinindustries.workers.dev/simulate
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-chain-evm-call-simulator-c484e832
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YZQo1Ccui7zjl8qbfrp3S

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 base-chain-evm-call-simulator-c484e832
```

Example prompt: Before I actually send it, can you simulate this Base chain call to contract 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 using calldata 0xa9059cbb000000000000000000000000abc...0000000000000000000000000000000000000000000000000de0b6b3a7640000 from my wallet 0xDEF... and tell me if it will revert, what the revert reason is, and how much gas it would use?

## When to prefer this

Use this endpoint when you need a live, trustless simulation of an EVM call on Base chain without relying on any third-party data providers. Ideal for pre-flight checks before broadcasting transactions, gas estimation, revert debugging, and calldata validation against real Base chain state. Prefer this over static analysis tools when you need actual chain-state-aware simulation (e.g. checking real token balances, live contract storage).

## Known failure modes

- Invalid address format for 'to' field — returns error
- Malformed calldata hex string — may return unexpected revert or error
- Contract does not exist at given address on Base — call succeeds with empty return data
- Network/RPC timeout — returns HTTP 5xx
- Payment not included or insufficient — returns HTTP 402
- Very complex calls may hit gas limits and revert unexpectedly

## How this service works

Self-computed Base onchain toolkit for AI agents: ERC-20 safety scan, manipulation-resistant TWAP price oracle, gas/fee oracle, calldata decoder, token/address/contract intel, wallet approval-risk audit, and batch token triage — all computed live from raw Base chain, no third-party data.

## Output

Returns a JSON object with: whether the call succeeded or reverted (boolean), the revert reason string if it failed, estimated gas units if it succeeded, the raw return data hex, the Base block height at which it was simulated, the simulated caller and target addresses, ETH value in wei, a timestamp, and a flag confirming no third-party data was used.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "to"
 ],
 "properties": {
  "to": {
   "type": "string",
   "description": "Target contract/address of the call."
  },
  "data": {
   "type": "string",
   "description": "Calldata hex (0x..). Omit for a plain value transfer."
  },
  "from": {
   "type": "string",
   "description": "Caller to simulate as (msg.sender)."
  },
  "value": {
   "type": "string",
   "description": "ETH value in wei (integer string)."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "to": {
   "type": "string",
   "description": "target"
  },
  "from": {
   "type": "string",
   "description": "simulated caller (or null)"
  },
  "block": {
   "type": "integer",
   "description": "Base block height"
  },
  "success": {
   "type": "boolean",
   "description": "call did not revert"
  },
  "valueWei": {
   "type": "string",
   "description": "value in wei"
  },
  "computedAt": {
   "type": "string",
   "description": "ISO-8601 timestamp"
  },
  "returnData": {
   "type": "string",
   "description": "returned data hex (or null)"
  },
  "willRevert": {
   "type": "boolean",
   "description": "call reverts"
  },
  "gasEstimate": {
   "type": "string",
   "description": "estimated gas units (or null if reverting)"
  },
  "revertReason": {
   "type": "string",
   "description": "first line of the revert error (or null)"
  },
  "thirdPartyDataUsed": {
   "type": "boolean",
   "description": "always false"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/base-chain-evm-call-simulator-c484e832/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-data-api.bodhinindustries.workers.dev](https://www.zero.xyz/host/x402-data-api.bodhinindustries.workers.dev/llms.txt)