Click on "Install Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type @ followed by the MCP server name and your instructions, e.g., "@wave-mcp show me overdue invoices"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
An MCP server for Wave Accounting, providing access to invoicing, customers, products, transactions, bills, estimates, taxes, and financial reporting via Wave's GraphQL API.
Category | Tools | Capabilities |
Invoices | 10 | List, get, create, update, delete, send, approve, mark sent, list/record payments |
Customers | 6 | List, get, create, update, delete, search by name/email |
Products | 5 | List, get, create, update, archive products and services |
Accounts | 4 | List, get, create, update chart of accounts |
Transactions | 6 | List, get, create, update, categorize, list attachments |
Bills | 6 | List, get, create, update, list/record bill payments |
Estimates | 6 | List, get, create, update, send, convert to invoice |
Taxes | 3 | List, get, create sales taxes |
Businesses | 3 | List, get current, get by ID |
Reporting | 5 | P&L, Balance Sheet, Aged Receivables, Tax Summary, Cashflow |
Pre-built UI layout definitions accessible via wave://apps/{name}:
invoice-dashboard, invoice-detail, invoice-builder, customer-detail, customer-grid, product-catalog, chart-of-accounts, transaction-feed, transaction-categorizer, bill-manager, estimate-builder, tax-overview, profit-loss, balance-sheet, cashflow-chart, aging-report, business-overview
Related MCP server: Wave MCP Server
A Wave account
An OAuth2 access token from the Wave Developer Portal
npm install
npm run build# Required
export WAVE_ACCESS_TOKEN=your_oauth2_access_token
# Optional — set a default business ID so you don't have to pass it every call
export WAVE_BUSINESS_ID=your_business_idWAVE_ACCESS_TOKEN=your_token npm run devAdd to your MCP config:
{
"mcpServers": {
"wave": {
"command": "node",
"args": ["/path/to/wave-mcp/build/main.js"],
"env": {
"WAVE_ACCESS_TOKEN": "your_access_token",
"WAVE_BUSINESS_ID": "optional_business_id"
}
}
}
}// List overdue invoices
wave_list_invoices({ status: "OVERDUE" })
// Create an invoice
wave_create_invoice({
customerId: "customer_456",
invoiceDate: "2026-01-15",
items: [
{ description: "Consulting", quantity: 10, unitPrice: "150.00" }
]
})
// Profit & Loss report
wave_profit_and_loss({ startDate: "2026-01-01", endDate: "2026-03-31" })
// Search customers
wave_search_customers({ query: "acme" })src/
├── main.ts # Entry point — reads env, starts server
├── server.ts # MCP server setup, request routing
├── client.ts # Wave GraphQL API client (gql.waveapps.com)
├── types/index.ts # TypeScript types for all Wave entities
├── tools/
│ ├── invoices-tools.ts # 10 invoice tools
│ ├── customers-tools.ts # 6 customer tools
│ ├── products-tools.ts # 5 product tools
│ ├── accounts-tools.ts # 4 account tools
│ ├── transactions-tools.ts # 6 transaction tools
│ ├── bills-tools.ts # 6 bill tools
│ ├── estimates-tools.ts # 6 estimate tools
│ ├── taxes-tools.ts # 3 tax tools
│ ├── businesses-tools.ts # 3 business tools
│ └── reporting-tools.ts # 5 reporting tools
└── apps/index.ts # 17 MCP app resource definitionsAll tools use parameterized GraphQL queries against https://gql.waveapps.com/graphql/public. Auth is via OAuth2 Bearer token.
npm run build # Compile TypeScript
npm run watch # Watch mode
npx tsc --noEmit # Type-check without emittingMIT
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