# Accounting and invoicing APIs for AI agents (slim)

> 8 accounting & invoicing listings ranked by the Anchor benchmark. Leader Apideck Accounting API + MCP (BB). APIs for bookkeeping and invoicing: ledgers, invoices, bills, expenses and reports, straight from the accounting software or through one API across many. Compared on the objects covered, write access, sandboxes, rate limits and price.

- Full: https://www.anchorterminal.com/categories/accounting.md (~4,050 tokens) · this version ~480 tokens · JSON https://www.anchorterminal.com/categories/accounting.json · canonical https://www.anchorterminal.com/categories/accounting
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-04

- Tools: 8 · agent-ready (BB+): 2 · accept x402: 0 · JSON: https://www.anchorterminal.com/api/v1/tools.json · by capability: https://www.anchorterminal.com/api/v1/capabilities.json
- Capabilities: accounting.ledger, accounting.invoices, accounting.bills, accounting.reports, accounting.unified

| # | Tool | Grade | Score | Confidence | x402 | Auth | Where | Slim |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 60 | Apideck Accounting API + MCP | BB | 73.2 | medium | no | API key | hosted + local | https://www.anchorterminal.com/tools/apideck-accounting.min.md |
| 100 | Merge Accounting API | BB | 70.2 | medium | no | API key | hosted | https://www.anchorterminal.com/tools/merge-accounting.min.md |
| 143 | Xero API + MCP | B | 67.4 | medium | no | OAuth | hosted + local | https://www.anchorterminal.com/tools/xero.min.md |
| 291 | FreeAgent API | C | 57.6 | medium | no | OAuth | hosted | https://www.anchorterminal.com/tools/freeagent.min.md |
| 311 | Rutter Accounting API | C | 55.8 | medium | no | API key | hosted | https://www.anchorterminal.com/tools/rutter.min.md |
| 342 | Invoice Ninja API | D | 52.4 | medium | no | API key | hosted | https://www.anchorterminal.com/tools/invoice-ninja.min.md |
| 369 | QuickBooks Online API + MCP | D | 49.3 | low | no | OAuth | hosted + local | https://www.anchorterminal.com/tools/quickbooks-online.min.md |
| 397 | FreshBooks API | E | 45.6 | medium | no | OAuth | hosted | https://www.anchorterminal.com/tools/freshbooks.min.md |