ledger-mcp 0.1.0

Double-entry accounting MCP server for AI agents — create accounts, post balanced journal entries, pull trial-balance / general-ledger reports. Paid per call via x402 micropayments (USDC on Base).

Ledger MCP

Double-entry accounting for AI agents. An MCP server over the Ledger API — create a chart of accounts, post balanced journal entries, and pull trial-balance / general-ledger reports, all from inside your agent.

Ledger is agent-native: it's paid per call via x402 micropayments (USDC on the Base network), so an agent can use real double-entry bookkeeping without an account, API key, or subscription — it just pays a fraction of a cent per call from its own wallet.

Install

uvx ledger-mcp

Or add it to your MCP client (claude-code-config.json / Claude Desktop):

{
  "mcpServers": {
    "ledger": {
      "command": "uvx",
      "args": ["ledger-mcp"],
      "env": {
        "LEDGER_X402_PRIVATE_KEY": "0xYOUR_FUNDED_BASE_WALLET_KEY"
      }
    }
  }
}

Payment

Most tools are paid per call (reads ~$0.002, writes ~$0.01, in USDC on Base):

• Set LEDGER_X402_PRIVATE_KEY to the private key of a funded Base wallet (holding USDC). The server signs the x402 (EIP-3009) payment automatically on each call — gasless, you only spend the USDC the call costs.
• Without a key, health and discover still work, and paid tools return the exact price plus how to enable payment (nothing is spent).
• Use a dedicated low-balance wallet for your agent — never your main key. The balance is the blast radius.

Run discover to see every endpoint and its current price before spending.

Tools

Tool	Cost	What it does
health	free	API status + version
discover	free	List paid endpoints + x402 prices
create_account	write	Add an account (asset/liability/equity/revenue/expense)
list_accounts	read	Chart of accounts + balances
get_account	read	One account's balance (optionally as-of a date)
post_transaction	write	Record a balanced journal entry
list_transactions	read	Journal, newest first
get_transaction	read	One transaction with all entries
reverse_transaction	write	Post a reversing entry
trial_balance	read	All balances + debit/credit totals
general_ledger	read	Per-account detail over a date range

The one rule: entries sum to zero

Every transaction is two or more entries whose signed amounts sum to exactly 0. Amounts are integers in minor units (cents): a debit is positive, a credit is negative.

Record a $500 cash sale (debit Cash, credit Sales Revenue):

{
  "date": "2026-06-19",
  "description": "Cash sale",
  "entries": [
    {"account_id": 1, "amount": 50000, "memo": "cash in"},
    {"account_id": 2, "amount": -50000, "memo": "sales revenue"}
  ]
}

The server rejects an unbalanced transaction before spending.

Links

• Docs & API: https://ledger.novadyne.ai
• API base: https://ledger-api.novadyne.ai
• x402 discovery: https://ledger-api.novadyne.ai/.well-known/x402

MIT licensed. By Novadyne. The API backend is operated by Novadyne; this package is the open client that talks to it.