# prepareContractTransaction

Prepare a smart contract interaction transaction for signing. Returns transaction data that can be signed and broadcast.

Agent View of the PolicyLayer registry record for `prepareContractTransaction`. HTML page: https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/preparecontracttransaction

## Facts

- Tool: `prepareContractTransaction`
- Server: MCP Ethers Wallet (`crazyrabbitltc/mcp-ethers-server`) — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server.md
- Homepage: https://github.com/crazyrabbitLTC/mcp-ethers-server
- Risk category: Execute (High risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "prepareContractTransaction",
    "arguments": {}
  }
}
```

## Why prepareContractTransaction is rated High

This tool prepares a smart contract transaction intended to be signed and broadcast to the Ethereum network. While 'prepare' implies it doesn't directly execute the transaction, it constructs transaction data for arbitrary smart contract interactions that could trigger financial transfers, token minting/burning, or other irreversible on-chain operations.

From the tool's own definition: "'Prepare a smart contract interaction transaction for signing. Returns transaction data that can be signed and broadcast.'"

## Use case

AI agents invoke prepareContractTransaction to trigger actions in MCP Ethers Wallet. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches MCP Ethers Wallet:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "prepareContractTransaction": {
      "limits": [
        {
          "counter": "preparecontracttransaction_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on MCP Ethers Wallet (68)

- `contractCall` — Execute — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/contractcall.md
- `prepareERC1155SetApprovalForAll` — Execute — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/prepareerc1155setapprovalforall.md
- `prepareERC721SetApprovalForAll` — Execute — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/prepareerc721setapprovalforall.md
- `signMessage` — Execute — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/signmessage.md
- `approveERC20` — Financial — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/approveerc20.md
- `approveNFT` — Financial — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/approvenft.md
- `ethSign` — Financial — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/ethsign.md
- `prepareERC1155BatchTransfer` — Financial — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/prepareerc1155batchtransfer.md
- `prepareERC20Approval` — Financial — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/prepareerc20approval.md
- `prepareTransaction` — Financial — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/preparetransaction.md
- `safeBatchTransferERC1155` — Financial — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/safebatchtransfererc1155.md
- `safeTransferERC1155` — Financial — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/safetransfererc1155.md
- `safeTransferERC721` — Financial — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/safetransfererc721.md
- `sendSignedTransaction` — Financial — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/sendsignedtransaction.md
- `sendTransaction` — Financial — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/sendtransaction.md
- `sendTransactionWithOptions` — Financial — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/sendtransactionwithoptions.md
- `transferERC20` — Financial — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/transfererc20.md
- `transferERC721` — Financial — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/transfererc721.md
- `transferFromERC20` — Financial — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/transferfromerc20.md
- `transferNFT` — Financial — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/transfernft.md
- `loadWallet` — Other — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/loadwallet.md
- `checkWalletExists` — Read — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/checkwalletexists.md
- `erc1155_balanceOf` — Read — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/erc1155-balanceof.md
- `erc1155_balanceOfBatch` — Read — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/erc1155-balanceofbatch.md
- `erc1155_uri` — Read — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/erc1155-uri.md
- `erc20_balanceOf` — Read — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/erc20-balanceof.md
- `erc20_getTokenInfo` — Read — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/erc20-gettokeninfo.md
- `erc721_balanceOf` — Read — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/erc721-balanceof.md
- `erc721_tokenURI` — Read — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/erc721-tokenuri.md
- `formatEther` — Read — https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server/formatether.md
- …and 38 more: https://policylayer.com/tools/crazyrabbitltc-mcp-ethers-server.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

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Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=crazyrabbitltc-mcp-ethers-server · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/crazyrabbitltc-mcp-ethers-server