web3_subscribe

Subscribe to a paid tier (build or pro) using x402 USDC payment on Base.\n\n

SERVER0xarchive SOURCE0xarchiveio/0xarchive-mcp

Critical RISK CLASS

Category Financial

Parameters 00 required

Recommended Approval-gatedsee the rule below

Registry record Grade F, identity unverified Pull the record →

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

WHAT IT DOES

What web3_subscribe does on 0xarchive

AI agents use web3_subscribe to commit financial operations through 0xarchive, usually the final step of a payment, billing, or trading workflow. A call moves real money.

RISK

Why web3_subscribe is rated Critical

This tool initiates a financial transaction by processing a USDC payment on the Base blockchain to subscribe to a paid tier. It directly moves cryptocurrency (USDC) and commits financial obligations, making it Financial category with critical severity due to the risk of unauthorized or erroneous payments.

From the tool's definition Subscribe to a paid tier (build or pro) using x402 USDC payment on Base

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs web3_subscribe 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_subscribe, this is the rule to start with:

web3_subscribe Approval-gated

Any call to web3_subscribe is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "web3_subscribe": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

GATE THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect 0xarchive, apply this rule, and every web3_subscribe call is checked against it from then on.

FAQ

Questions about web3_subscribe

What does the web3_subscribe tool do? +

Subscribe to a paid tier (build or pro) using x402 USDC payment on Base.\n\n. It is categorised as a Financial tool in the 0xarchive MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on web3_subscribe? +

Register the 0xarchive MCP server in PolicyLayer and add a rule for web3_subscribe: 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_subscribe? +

web3_subscribe is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit web3_subscribe? +

Yes. Add a rate_limit block to the web3_subscribe 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_subscribe completely? +

Set action: deny in the PolicyLayer policy for web3_subscribe. 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_subscribe? +

web3_subscribe 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.

KEEP EXPLORING

More on 0xarchive, and thousands of servers like it.

This server

All 4 0xarchive tools → Critical-risk tools on this server →

Across the catalogue

subscribe_ltp on Groww MCP Server → All critical-risk MCP tools → The MCP Attack Database →

Guides

Govern MCP payment tools →Human-in-the-loop →Tool call approval →