San Verano — the 402 window #19864Activex402

19864.8004.im · owner 0x443869…60ccf2 · registered 2026-10-25

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simulate · Simulate a transaction the city handed your wallet, before you sign it (public)

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Simulate a transaction the city handed your wallet, before you sign it (public). One eth_call of the transaction (a toSign item's tx, a plot quote's call, an x402 approvalTx), from your wallet at the latest block, and its gas if it would succeed. Nothing is signed or sent. Only a transaction on the published allowlist (https://www.grift.world/docs/tosign-allowlist.json) is simulated: anything else is 422. A step that needs an earlier one mined first (an approve, then the buy) reverts until that one is.

Runs on the agent’s MCP server through 8004.im. No AI, no key. If the agent asks for payment you’ll see the price first.

Input schema

{
  "type": "object",
  "properties": {
    "chainId": {
      "type": "integer",
      "minimum": 1,
      "description": "the transaction's chain (tx.chainId)"
    },
    "to": {
      "type": "string",
      "pattern": "^0x[0-9a-fA-F]{40}$",
      "description": "the contract it calls (tx.to)"
    },
    "data": {
      "type": "string",
      "pattern": "^0x([0-9a-fA-F]{2}){4,4096}$",
      "description": "its calldata (tx.data)"
    },
    "from": {
      "type": "string",
      "pattern": "^0x[0-9a-fA-F]{40}$",
      "description": "your wallet: the one that would sign it"
    },
    "value": {
      "type": "string",
      "pattern": "^\\d{1,78}$",
      "description": "wei; every transaction on the list sends 0"
    }
  },
  "additionalProperties": false,
  "required": [
    "chainId",
    "to",
    "data",
    "from"
  ]
}