web3_challenge

Get a SIWE (Sign-In with Ethereum) challenge message for a wallet address.

SERVER0xarchive SOURCE0xarchiveio/0xarchive-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/0xarchiveio-0xarchive-mcp/web3-challenge.md

WHAT IT DOES

What web3_challenge does on 0xarchive

AI agents call web3_challenge to retrieve information from 0xarchive without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why web3_challenge is rated Low

This tool performs a read operation by generating and returning a SIWE challenge message for authentication purposes. There are no side effects, data modifications, code execution, financial transactions, or destructive operations.

From the tool's definition Get a SIWE (Sign-In with Ethereum) challenge message for a wallet address. The tool retrieves a challenge message; it does not modify data, execute code, delete anything, or move funds.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs web3_challenge safely

PolicyLayer is an MCP gateway: it sits between your AI agents and 0xarchive, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For web3_challenge, this is the rule to start with:

web3_challenge Allowed

web3_challenge is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "web3_challenge": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect 0xarchive, apply this rule, and every web3_challenge call is checked against it from then on.

FAQ

Questions about web3_challenge

What does the web3_challenge tool do? +

Get a SIWE (Sign-In with Ethereum) challenge message for a wallet address. It is categorised as a Read tool in the 0xarchive MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on web3_challenge? +

Register the 0xarchive MCP server in PolicyLayer and add a rule for web3_challenge: 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 0xarchive. Nothing to install.

What risk level is web3_challenge? +

web3_challenge is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit web3_challenge? +

Yes. Add a rate_limit block to the web3_challenge 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 web3_challenge completely? +

Set action: deny in the PolicyLayer policy for web3_challenge. 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 web3_challenge? +

web3_challenge is provided by the 0xarchive MCP server (0xarchiveio/0xarchive-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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