B20 Truth MCP

An MCP server that checks who controls any Base B20 token by reading Base's B20 precompiles live. It reports which accounts can administer, mint, seize, pause, or block the token, along with pause state, supply cap, policy lists, and the genesis transaction.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

Vendor evidenceStreamable HTTPNo sign-inEndpoint checked 2026-11-01Operated by Script Master Labs LLC

MCP endpoint (Streamable HTTP)

https://b20.scriptmasterlabs.com/mcp

Vendor documentation

What you can do with it

Check Base B20 token control roles
Verify on-chain token administration powers
Retrieve token pause state and supply cap
Identify policy list holders and genesis transaction

Source and maintenance

Vendor evidenceRegistry 1.0.1

mcp-registry: com.scriptmasterlabs/b20-truth@1.0.1 Project website

Protocol and capabilities

Server: b20-truth 1.0.0
MCP protocol: 2025-06-18
Tools: 1 advertised
Resources: Not advertised
Resource templates: Not advertised
Prompts: Not advertised

Server-advertised capabilities

{
  "tools": {
    "listChanged": true
  }
}

Tools

1 advertised

b20_check — Check a Base B20 token

Advertised by the server during the last successful anonymous check.

Advertised read-onlyOpen-world

Before buying, holding, or accepting a Base B20 token (address starts 0xB200 or 0xB201), check who can mint, seize, pause, or block it. Returns a verdict (LOCKED, PARTIALLY_CONTROLLED, ISSUER_CONTROLLED) from live precompile reads. Full role holders and history are available over x402.

b20_check input schema

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "address"
  ],
  "properties": {
    "address": {
      "type": "string",
      "pattern": "^0x[0-9a-fA-F]{40}$",
      "description": "B20 token address on Base"
    }
  }
}

b20_check annotations

{
  "readOnlyHint": true,
  "openWorldHint": true,
  "idempotentHint": true,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks: 1 of 1 (100%)
Average latency: 415 ms
95th percentile latency: 415 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

Nov 1, 2026, 7:14 AM UTC · probe · passed · 415 ms · metadata changed · 1 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http b20-truth-mcp https://b20.scriptmasterlabs.com/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add b20-truth-mcp --url https://b20.scriptmasterlabs.com/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable b20-truth-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "b20-truth-mcp": {
      "url": "https://b20.scriptmasterlabs.com/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).

Cline configuration

{
  "mcpServers": {
    "b20-truth-mcp": {
      "type": "streamableHttp",
      "url": "https://b20.scriptmasterlabs.com/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start b20-truth-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "b20-truth-mcp": {
      "type": "http",
      "url": "https://b20.scriptmasterlabs.com/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http b20-truth-mcp https://b20.scriptmasterlabs.com/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "b20-truth-mcp": {
      "url": "https://b20.scriptmasterlabs.com/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "b20-truth-mcp": {
      "serverUrl": "https://b20.scriptmasterlabs.com/mcp"
    }
  }
}

Let your agent find its tools

Find servers like B20 Truth MCP from your agent. Add Koskamo once to search the index for endpoints, access requirements, and client setup. Public discovery needs no key.

Connect Koskamo Explore workflows

See all 3,921

Do you run B20 Truth MCP?

Prove ownership with a DNS record, a well-known file, or your Official MCP Registry entry, and your edits publish immediately. Proofs are re-checked weekly; admins can still hide or remove a listing.

Claim this listing