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8 clients · secrets stay placeholders

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

claude mcp add --transport http b20check https://b20check.com/mcp

[mcp_servers.b20check]
url = "https://b20check.com/mcp"

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "b20check": {
      "type": "remote",
      "url": "https://b20check.com/mcp",
      "enabled": true
    }
  }
}

{
  "mcpServers": {
    "b20check": {
      "type": "http",
      "url": "https://b20check.com/mcp"
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=b20check&config=eyJ0eXBlIjoiaHR0cCIsInVybCI6Imh0dHBzOi8vYjIwY2hlY2suY29tL21jcCJ9"
}

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

{
  "mcpServers": {
    "b20check": {
      "httpUrl": "https://b20check.com/mcp"
    }
  }
}

extensions:
  "b20check":
    enabled: true
    name: "b20check"
    type: streamable_http
    uri: "https://b20check.com/mcp"
    timeout: 300

Quality 82 / 100good

protocol75 · weight 25

warn
protocol.modernnewest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
n/a
protocol.statelessonly applies to 2026-07-28 servers
pass
protocol.transportstreamable HTTP
n/a
protocol.list_ttlonly applies to 2026-07-28 servers

authorizationn/a · weight 15

n/a
auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
n/a
auth.secret_in_urlno templated URL

tool hygiene86 · weight 30

pass
tools.descriptionsevery tool has a description
pass
tools.description_lengthdescriptions are concise
pass
tools.schemasevery tool has an object input schema
pass
tools.annotations2 of 2 tools declare readOnlyHint or destructiveHint
fail
tools.directory_hintsno tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: verify_b20_token (destructiveHint); b20_stats (destructiveHint)
pass
tools.token_costabout 425 tokens to load every tool
pass
tools.api_dumptools are not a one-to-one API dump

stability100 · weight 15

pass
stability.changesno tool changes in 30 days
pass
stability.rug_pullno tool changed its meaning under the same name

dependencies67 · weight 15

pass
deps.known_vulnsno known advisory in 114 resolved packages
fail
deps.mcp_sdk_version@modelcontextprotocol/sdk 1.30.1 has 1 known advisory (GHSA-6qxp-vccf-f47h); update @modelcontextprotocol/sdk to 1.31.0 or later
pass
deps.resolvable[email protected] resolved: 114 packages

2 tools, about 425 tokens to load them all · tool set 47d874adad7e · checked 2026-10-20 10:03 UTC

Tool changes

No tool definition changes recorded. A server's first observation is its baseline; later probes record what changes.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 48 / 100

no-repository

provenance55

liveness9

freshness65

hygiene80

+dns-namespace +website -unreachable(3 failures) ~updated-100d-ago -no-repository

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Dependencies

[email protected] npm113 dependencies, resolved · MCP SDK @modelcontextprotocol/sdk 1.30.1 · advisories checked 2026-10-19

advisory	severity	package	fixed in
GHSA-6qxp-vccf-f47hMCP TypeScript SDK: OAuth client could send credentials to an authorization server chosen by the MCP server	high	`@modelcontextprotocol/[email protected]`MCP SDK, direct	fixed in `1.31.0`

Dependency graphs from deps.dev; advisories from OSV.dev, including the GitHub Advisory Database and the PyPI Advisory Database; all CC BY 4.0. The graph is what a clean install of this version resolves today; nothing was installed or run. How it is checked.

Endpoints

remote	auth	reachable	uptime 30d	p50	protocol	last ok
`https://b20check.com/mcp` streamable-http	none	no (3 failures)	97%	287 ms	2025-11-25	2026-10-16

package	registry	version	runtime	secrets
`b20check-mcp`	npm	0.1.1	–

Tools (2)

b20_statsread-only 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).

verify_b20_tokenread-only Check whether a token address on Base is a legitimate B20 token and what powers its issuer holds. Call this BEFORE helping the user buy, swap, approve, or move value into any B20 token you have not already verified in this conversation (B20 addresses usually start with 0xb20). Returns a signed verdict: isB20, a verdict of ok/caution/danger/not_applicable, risk flags (mint, freeze, seize, pause, admin, impostor, and more), and the data freshness (indexed/live/not_indexed). not_applicable means the address is not a B20 and not a recognized canonical asset: do NOT read it as safe, there is simply nothing B20-specific to vouch for. Never treat a not_indexed or error result as safe either: a token that cannot be fully checked is never a clean pass. The result carries an EIP-712 signature the user can verify independently; do not overstate it as a guarantee of safety, report what the flags and verdict actually say.

Schemas: list_tools.

Similar MCP servers

Official server.json

{
  "name": "com.b20check/b20check",
  "title": "B20 Check",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "remotes": [
    {
      "url": "https://b20check.com/mcp",
      "type": "streamable-http"
    }
  ],
  "version": "0.1.1",
  "packages": [
    {
      "version": "0.1.1",
      "transport": {
        "type": "stdio"
      },
      "identifier": "b20check-mcp",
      "registryType": "npm",
      "registryBaseUrl": "https://registry.npmjs.org"
    }
  ],
  "websiteUrl": "https://b20check.com",
  "description": "Verify B20 tokens on Base: issuer powers, imposter detection, signed EIP-712 verdicts."
}