# web3_subscribe

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

Agent View of the PolicyLayer registry record for `web3_subscribe`. HTML page: https://policylayer.com/tools/0xarchiveio-0xarchive-mcp/web3-subscribe

## Facts

- Tool: `web3_subscribe`
- Server: 0xarchive (`0xarchiveio/0xarchive-mcp`) — https://policylayer.com/tools/0xarchiveio-0xarchive-mcp.md
- Homepage: https://github.com/0xArchiveIO/0xarchive-mcp
- Risk category: Financial (Critical risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Approval-gated

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

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "web3_subscribe",
    "arguments": {}
  }
}
```

## 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 own definition: "Subscribe to a paid tier (build or pro) using x402 USDC payment on Base"

## Use case

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.

## Recommended policy (PolicyLayer)

Verdict: **Approval-gated**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches 0xarchive:

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

## Other tools on 0xarchive (3)

- `web3_revoke_key` — Destructive — https://policylayer.com/tools/0xarchiveio-0xarchive-mcp/web3-revoke-key.md
- `web3_challenge` — Read — https://policylayer.com/tools/0xarchiveio-0xarchive-mcp/web3-challenge.md
- `web3_list_keys` — Read — https://policylayer.com/tools/0xarchiveio-0xarchive-mcp/web3-list-keys.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`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=0xarchiveio-0xarchive-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/0xarchiveio-0xarchive-mcp