What is bnbchain-mcp CLAUDE.md?

A project guide for BNBChain MCP, a server that lets AI assistants call tools for BNB Chain blockchain networks and Greenfield storage. It documents the TypeScript codebase, its modules, supported connection methods, and development commands.

Use it when developing, building, testing, formatting, or running the BNBChain MCP server and its EVM or Greenfield tools.

It explains where blockchain, storage, transfer-confirmation, and server code belong, reducing guesswork when changing the project.

How bnb-chain/bnbchain-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to bnb-chain/bnbchain-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/bnb-chain/bnbchain-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/bnb-chain/bnbchain-mcp

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

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Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

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Per session 1,928 This file is loaded in full into every session.

When invoked 1,928 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.01928	$0.01928
Opus 5.5	$0.00771	$0.00771
Sonnet 5.5	$0.00386	$0.00386
Haiku 4.5	$0.00193	$0.00193

Measured 2mo ago against content hash 3e7376cd31ed, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

bnbchain-mcp CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 184 lines

How it starts

The opening of the file, as written. The whole thing — 184 lines — stays where its author put it; the contents beside it link to each section on GitHub.

bnbchain-mcp

Project Overview

BNBChain MCP is a Model Context Protocol server that exposes BNB Chain blockchain operations as AI-callable tools. It supports two transport modes: stdio (default — local dev, IDE integrations, Claude Desktop) and SSE (HTTP + Server-Sent Events, port 3001). Three top-level modules handle EVM-compatible chains (evm), BNB Greenfield storage (gnfd), and a transfer preview-then-confirm flow (confirm).

Tech Stack

Runtime: Bun. Source is ESM; build output is CJS (bun build --format cjs).
Language: TypeScript 5.x
Blockchain: viem 2.x (EVM), @bnb-chain/greenfield-js-sdk 2.x (Greenfield)
MCP: @modelcontextprotocol/sdk 1.x
HTTP (SSE mode): Express 4.x + cors
Validation: Zod 3.x
Lint/format: Biome (no Prettier, no ESLint)
Tests: bun:test (no Jest, no Vitest)

Architecture

src/
  evm/          # EVM-compatible chains (BSC, ETH, Polygon, …)
    chains.ts   # chainMap (by ID) and networkNameMap (by name)
    modules/    # blocks, contracts, network, nft, tokens, transactions, wallet
    services/
      clients.ts  # viem clients cached by chain ID — always reuse, never ad-hoc
  gnfd/         # BNB Greenfield storage & payment
  confirm/      # pendingTransferStore (5-min TTL), confirm_transfer tool
  server/
    base.ts     # registers all module tools via register*() exports
  utils/
  index.ts      # entrypoint; selects stdio or SSE transport
e2e/            # E2E tests using MCPClient from e2e/util.ts

Key patterns:

MCP tool registration: each module exports a register* function called in src/server/base.ts.
Transfer confirmation: write tools return a confirmToken + preview; confirm_transfer executes on approval. Controlled by BNBCHAIN_MCP_SKIP_TRANSFER_CONFIRMATION.
Chain lookup: use chainMap (by chain ID) or networkNameMap (by name string) from src/evm/chains.ts.
Internal path alias: @/* → src/* (defined in tsconfig.json).

Key environment variables (see .env.example):

PRIVATE_KEY — wallet private key (optional; required for write ops)
PORT — HTTP port for SSE mode (default: 3001)
LOG_LEVEL — DEBUG / INFO / WARN / ERROR
BNBCHAIN_MCP_SKIP_TRANSFER_CONFIRMATION — skip confirm flow (default: false)

Read the full file on GitHub · 184 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 184 lines · 1,928 tokens per session scan A 3e7376cd31ed

Subscribe to this mod's changes

bnbchain-mcp CLAUDE.md is an instructions file published in the GitHub repository bnb-chain/bnbchain-mcp (61 stars, last pushed 2d ago), licensed MIT. It adds 1,928 tokens to every session, about $0.0077 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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bnbchain-mcp: Instructions file for Claude Code