{
  "data": {
    "tool": {
      "category": "",
      "endpoint": "https://b20check.com/mcp",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/b20check.json",
      "kind": "mcp",
      "listed": "indexed",
      "liveUrl": "https://www.anchorterminal.com/api/v1/live/b20check.json",
      "markdownUrl": "https://www.anchorterminal.com/tools/b20check.md",
      "mcpTools": {
        "check": {
          "checker": "anchor-check/1.0",
          "totalTokens": 904,
          "counts": {
            "error": 0,
            "note": 0,
            "warn": 0
          },
          "findings": []
        },
        "checkedAt": "2026-10-04T22:22:12Z",
        "count": 2,
        "schemaTokens": 904,
        "status": "ok",
        "tools": [
          {
            "name": "verify_b20_token",
            "title": "Verify a B20 token",
            "description": "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.",
            "inputSchema": {
              "$schema": "http://json-schema.org/draft-07/schema#",
              "additionalProperties": false,
              "properties": {
                "address": {
                  "description": "The token contract address on Base to check (B20 addresses usually start with 0xb20).",
                  "pattern": "^0x[0-9a-fA-F]{40}$",
                  "type": "string"
                }
              },
              "required": [
                "address"
              ],
              "type": "object"
            },
            "outputSchema": {
              "$schema": "http://json-schema.org/draft-07/schema#",
              "additionalProperties": false,
              "properties": {
                "address": {
                  "description": "The checked token address (EIP-55).",
                  "type": "string"
                },
                "attestation": {
                  "description": "Block-pinned EIP-712 attestation; verification recipe at https://b20check.com/v1/schema"
                },
                "creation": {},
                "dataSource": {
                  "description": "Data freshness. not_indexed = powers could not be fully checked; never a clean pass.",
                  "enum": [
                    "indexed",
                    "live",
                    "not_indexed"
                  ],
                  "type": "string"
                },
                "flags": {
                  "description": "Risk flags. Derivation rules: https://b20check.com/methodology",
                  "items": {
                    "additionalProperties": false,
                    "properties": {
                      "code": {
                        "type": "string"
                      },
                      "detail": {
                        "type": "string"
                      },
                      "severity": {
                        "enum": [
                          "info",
                          "low",
                          "medium",
                          "high"
                        ],
                        "type": "string"
                      }
                    },
                    "required": [
                      "code",
                      "severity",
                      "detail"
                    ],
                    "type": "object"
                  },
                  "type": "array"
                },
                "isB20": {
                  "description": "True only for a factory-native B20 token.",
                  "type": "boolean"
                },
                "issuerActivity": {},
                "issuerPowers": {
                  "description": "mint/burn/pause/freeze/seize/admin powers, latent-inclusive."
                },
                "network": {
                  "type": "string"
                },
                "variant": {},
                "verdict": {
                  "description": "Roll-up verdict. not_applicable = out of scope, do NOT read as safe.",
                  "enum": [
                    "ok",
                    "caution",
                    "danger",
                    "not_applicable"
                  ],
                  "type": "string"
                }
              },
              "required": [
                "address",
                "isB20",
                "verdict",
                "dataSource",
                "flags"
              ],
              "type": "object"
            },
            "annotations": {
              "idempotentHint": true,
              "openWorldHint": true,
              "readOnlyHint": true,
              "title": "Verify a B20 token"
            }
          },
          {
            "name": "b20_stats",
            "title": "B20 Check usage",
            "description": "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).",
            "inputSchema": {
              "$schema": "http://json-schema.org/draft-07/schema#",
              "properties": {},
              "type": "object"
            },
            "outputSchema": {
              "$schema": "http://json-schema.org/draft-07/schema#",
              "additionalProperties": false,
              "properties": {
                "l30DaysTotalCalls": {
                  "type": [
                    "number",
                    "null"
                  ]
                },
                "l30DaysUniquePayers": {
                  "type": [
                    "number",
                    "null"
                  ]
                },
                "lastUpdated": {
                  "type": "string"
                },
                "snapshotBlock": {
                  "type": "number"
                },
                "source": {
                  "type": "string"
                },
                "tokensIndexed": {
                  "type": "number"
                }
              },
              "type": "object"
            },
            "annotations": {
              "idempotentHint": true,
              "openWorldHint": true,
              "readOnlyHint": true,
              "title": "B20 Check usage"
            }
          }
        ]
      },
      "name": "B20 Check",
      "note": "Indexed from the official MCP registry: facts and our own checks, not reviewed, so no score, grade or rank.",
      "packages": [
        {
          "registryType": "npm",
          "identifier": "b20check-mcp",
          "version": "0.1.1",
          "transport": "stdio"
        }
      ],
      "pageJsonUrl": "https://www.anchorterminal.com/tools/b20check.json",
      "popularity": {
        "npmWeekly": 28
      },
      "registryName": "com.b20check/b20check",
      "remotes": [
        {
          "type": "streamable-http",
          "url": "https://b20check.com/mcp"
        }
      ],
      "repository": "",
      "reviewed": false,
      "slug": "b20check",
      "source": "the official MCP registry",
      "sourceUrl": "https://registry.modelcontextprotocol.io/v0.1/servers?search=com.b20check/b20check",
      "summary": "Verify B20 tokens on Base: issuer powers, imposter detection, signed EIP-712 verdicts.",
      "updatedAt": "2026-07-12T18:41:43Z",
      "url": "https://www.anchorterminal.com/tools/b20check",
      "vendor": "b20check.com",
      "vendorUrl": "https://b20check.com",
      "version": "0.1.1",
      "websiteUrl": "https://b20check.com",
      "where": "both",
      "why": [
        "vendor"
      ]
    }
  },
  "kind": "anchor.page",
  "links": {
    "api": "https://www.anchorterminal.com/api/v1/index.json",
    "html": "https://www.anchorterminal.com/tools/b20check",
    "json": "https://www.anchorterminal.com/tools/b20check.json",
    "llms": "https://www.anchorterminal.com/llms.txt",
    "markdown": "https://www.anchorterminal.com/tools/b20check.md",
    "slim": "https://www.anchorterminal.com/tools/b20check.min.md"
  },
  "markdown": "# B20 Check\n\n\u003e Indexed, not reviewed: facts from the official MCP registry and our own checks. No score, grade or rank, and not in the rankings until the panel reviews it. How the index works: https://www.anchorterminal.com/indexed/\n\n- Kind: MCP server, by b20check.com (https://b20check.com)\n- Listed because: It's published in the registry under b20check.com, a namespace the registry only gives to whoever proves they control that domain.\n- What the official MCP registry says: Verify B20 tokens on Base: issuer powers, imposter detection, signed EIP-712 verdicts.\n\n## Facts\n\n- MCP registry: `com.b20check/b20check` 0.1.1\n- Endpoint: https://b20check.com/mcp (streamable HTTP)\n- Package: npm `b20check-mcp` (stdio)\n- Website: https://b20check.com\n- npm downloads a week: 28\n- Registry entry updated: 2026-07-12\n\n## Tools\n\n- Tools it lists (2, about 904 tokens of context, `tools/list` without credentials over MCP 2025-11-25, checked 2026-10-04 22:22 UTC):\n  - `verify_b20_token` (read-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…\n  - `b20_stats` (read-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…\n- How its tools read to an agent (0 errors, 0 warnings, 0 notes, about 904 tokens; rules at https://www.anchorterminal.com/check.md; not part of the score):\n\n- JSON: https://www.anchorterminal.com/api/v1/tools/b20check.json\n- Being indexed says nothing about quality, and nobody can pay for it. Ask for a review: https://www.anchorterminal.com/builders/#claiming\n",
  "meta": {
    "attribution": "Anchor Terminal (https://www.anchorterminal.com)",
    "docs": "https://www.anchorterminal.com/docs/",
    "generatedAt": "2026-10-05",
    "license": "CC-BY-4.0",
    "method": "https://www.anchorterminal.com/benchmark/",
    "methodology": "0.3",
    "openapi": "https://www.anchorterminal.com/openapi.json",
    "preview": false,
    "run": "2026-10-01",
    "runLabel": "October 2026 research run"
  },
  "page": {
    "breadcrumbs": [
      {
        "name": "Home",
        "url": "https://www.anchorterminal.com/"
      },
      {
        "name": "Terminal",
        "url": "https://www.anchorterminal.com/tools/"
      },
      {
        "name": "Indexed",
        "url": "https://www.anchorterminal.com/indexed/"
      },
      {
        "name": "B20 Check",
        "url": ""
      }
    ],
    "description": "B20 Check, an MCP server by b20check.com, listed from the official MCP registry. Indexed, not reviewed: facts and our own checks, no score or ranking. Verify B20 tokens on Base: issuer powers, imposter detection, signed EIP-712 verdicts.",
    "facts": [
      "not reviewed",
      "not ranked",
      "facts only"
    ],
    "h1": "B20 Check",
    "image": "https://www.anchorterminal.com/assets/og/indexed.png",
    "path": "/tools/b20check",
    "published": "",
    "section": "indexed",
    "title": "B20 Check: MCP server, indexed from the official MCP registry",
    "toc": null,
    "updated": "2026-10-05",
    "url": "https://www.anchorterminal.com/tools/b20check"
  },
  "tokens": {
    "markdown": 600,
    "slim": 530
  },
  "version": 1
}