Build invoice workflows humans can trust

Quick start

curl https://freeinvoicemaker.app/.well-known/mcp.json

curl -X POST https://freeinvoicemaker.app/api/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"templates.query","params":{}}'

curl -X POST https://freeinvoicemaker.app/api/mcp \
  -H "Authorization: Bearer iv_..." \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"invoices.create","params":{"...":"..."}}'

Authentication

MCP tools (20)

Invoice lifecycle (8)

AI-native (3)

Templates and entities (5)

Platform (4)

Invoice DSL

The Invoice DSL is a compact text format for describing invoices. It uses ~100 tokens compared to ~400 for equivalent JSON, making it ideal for LLM-generated invoices.

INVOICE #INV-0042
FROM: Acme Corp | acme@example.com
TO: Globex Inc | globex@example.com
DATE: 2026-04-08
DUE: Net 30

Website redesign    | 1 | $4,200
Brand assets        | 1 | $1,800
Hosting (annual)    | 1 | $480

TAX: 10%
NOTE: Payment via wire transfer preferred.

Pass this string to invoices.createFromDsl to create a complete invoice in a single call.

Paid microservices (x402)

Some server endpoints use the x402 payment protocol with USDC on Base. These depend on configured providers; check the API documentation and verify availability before integrating. Browser PDF download is free.

Network: Base (USDC). Facilitator: x402.org.

Integration recipes

• Draft, approve, send — agent drafts with invoices.create, a human reviews, then an authenticated workflow sends or exports the invoice
• Import and extract — 2-call workflow: import (DOCX/CSV) → invoices.create
• Chain with Zapier MCP Client — connect iv to 7,000+ apps via Zapier MCP Client
• Chain with Stripe MCP — payment reconciliation via Stripe MCP Server
• Chain with QuickBooks MCP — sync invoices via QuickBooks Online MCP Server

SDKs and tools

Rate limits

Resources

• API Reference
• GitHub
• OpenAPI spec
• llms.txt