set_etherscan_api_key

SERVERVaultPilot MCP SOURCEvaultpilot-mcp

Medium RISK CLASS

Category Write

Parameters 11 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-szhygulin-vaultpilot-mcp/set-etherscan-api-key.md

WHAT IT DOES

What set_etherscan_api_key does on VaultPilot MCP

AI agents use set_etherscan_api_key to create or update resources in VaultPilot MCP, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your VaultPilot MCP environment.

Parameter	Type	Required	Description
`apiKey`	string	Yes	Etherscan V2 API key (34-char alphanumeric, e.g. ZQTKPM98R5N4YT8GMTBI3XR2P4HFZNTAYG). Get one for free at https://etherscan.io/myapikey. One key works across al

Parameters from the server's own tool schema.

RISK

Why set_etherscan_api_key is rated Medium

This tool modifies configuration state (the active Etherscan API key) reversibly. It doesn't execute transactions, delete data, or move funds—it only updates a runtime configuration parameter. This qualifies as Write rather than Read (which would be purely retrieving existing keys).

From the tool's definition Tool description states it sets/stores an Etherscan API key at runtime, taking precedence over environment variables and user config. The INPUT section specifies accepting a 34-char alphanumeric API key for storage.

Risk signalsHandles credentials or secrets (apiKey)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_etherscan_api_key safely

PolicyLayer is an MCP gateway: it sits between your AI agents and VaultPilot MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For set_etherscan_api_key, this is the rule to start with:

set_etherscan_api_key Rate-limited

set_etherscan_api_key stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "set_etherscan_api_key": {
      "limits": [
        {
          "counter": "set_etherscan_api_key_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect VaultPilot MCP, apply this rule, and every set_etherscan_api_key call is checked against it from then on.

FAQ

Questions about set_etherscan_api_key

What does the set_etherscan_api_key tool do? +

Set an Etherscan V2 API key for EVM transaction-history / allowance-enumeration / tx-explanation reads at runtime — no restart required. Takes precedence over ETHERSCAN_API_KEY env var and userConfig. One key works across all 5 supported EVM chains (Ethereum / Arbitrum / Polygon / Base / Optimism) via Etherscan's V2 unified API. Designed for the demo-mode flow where users want to enable tx-history / allowance / explain_tx tools without restarting their MCP client, but works in any mode. INPUT: bare API key only (34-char alphanumeric, e.g. ZQTKPM98R5N4YT8GMTBI3XR2P4HFZNTAYG). Pasting a URL is rejected to prevent prompt-injection redirects. WHERE TO GET ONE: https://etherscan.io/myapikey — sign in, click "Add", copy the key. Free tier covers personal-volume use comfortably (5 calls/sec, 100K calls/day). PERSISTENCE: process memory only. To save across restarts, run vaultpilot-mcp-setup (after exiting demo mode if applicable) and paste the same key when prompted. AGENT BEHAVIOR: when the user pastes a key in chat ('here's my Etherscan key: <34 chars>'), call this tool immediately. NEVER echo the key back in any subsequent response — treat it as secret-shaped. It is categorised as a Write tool in the VaultPilot MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does set_etherscan_api_key accept? +

set_etherscan_api_key accepts 1 parameter: apiKey. Required: apiKey. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on set_etherscan_api_key? +

Register the VaultPilot MCP server in PolicyLayer and add a rule for set_etherscan_api_key: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches VaultPilot MCP. Nothing to install.

What risk level is set_etherscan_api_key? +

set_etherscan_api_key is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit set_etherscan_api_key? +

Yes. Add a rate_limit block to the set_etherscan_api_key rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block set_etherscan_api_key completely? +

Set action: deny in the PolicyLayer policy for set_etherscan_api_key. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides set_etherscan_api_key? +

set_etherscan_api_key is provided by the VaultPilot MCP server (vaultpilot-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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