Security & Testing

b20check.com

A tool to verify B20 token legitimacy on Base and report usage statistics.

x402 supported1 endpoint2 known toolsFirst detected July 25, 2026Last detected August 12, 2026

ENDPOINT 1

https://b20check.com/mcp

No auth detected

MCP server metadata

Name: b20-check
Version: 0.1.2

Capabilities

tools.listChanged

Server instructions

Tools to check B20 tokens on Base. Run verify_b20_token before assisting with any value movement into a B20 token you have not already checked. Relay the verdict and flags plainly; never present a not_indexed or errored result as safe.

Known tools 2

verify_b20_token

Check whether a token address on Base is a legitimate B20 token and what powers its issuer holds.

Inferred read-only

b20_stats

Report B20 Check's own live usage: how many B20 tokens are indexed and how many paid calls and unique payers it has served in the last 30 days (from the public Coinbase discovery API).

Inferred read-only

CONNECT WITH APPROVAL

Client installation

Review this server and its permissions before adding it. Secret placeholders must be set locally.

Codex

~/.codex/config.toml

[mcp_servers.b20-check]
url = "https://b20check.com/mcp"
enabled = true

Claude Code

.mcp.json

{
  "mcpServers": {
    "b20-check": {
      "type": "http",
      "url": "https://b20check.com/mcp"
    }
  }
}

Claude Desktop

Settings → Connectors → Add custom connector

Name: b20-check
Remote MCP URL: https://b20check.com/mcp

Add this remote URL as a custom connector in Claude Desktop. Availability depends on the user plan and workspace policy.

Cursor

.cursor/mcp.json

{
  "mcpServers": {
    "b20-check": {
      "url": "https://b20check.com/mcp"
    }
  }
}

Visual Studio Code

.vscode/mcp.json

Add to Visual Studio Code

{
  "servers": {
    "b20-check": {
      "type": "http",
      "url": "https://b20check.com/mcp"
    }
  }
}

Generic MCP

Client-specific MCP configuration

{
  "name": "b20-check",
  "transport": "streamable-http",
  "url": "https://b20check.com/mcp"
}

MCP Inspector

Run the official MCP Inspector locally and enter the indexed Streamable HTTP endpoint.

TRUST AND VERIFICATION EVIDENCE

Trust Data Available

BuiltWith Trust API v2 evidence for b20check.com was fetched 2026-07-26T02:05:57.315Z.

Trust status Neutral

b20check.com is assessed as Neutral: No suspicious signals found, but no strong positive signal either

Indexed

Evidence is source-attributed and does not guarantee that a third-party server is safe. Risk labels are conservative metadata heuristics.