# FreshBooks API vs Rutter Accounting API

> Rutter Accounting API has a score of 55.8 (C) against FreshBooks API's 45.6 (E). Both do accounting ledger. The largest gap is maintenance & community, 48 points. Category scores, facts, verdicts and agent notes side by side.

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- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-05

Rutter Accounting API has a score of 55.8 (C) against FreshBooks API's 45.6 (E). Both do accounting ledger. The largest gap is maintenance & community, 48 points.

- FreshBooks API: grade E, 45.6/100, rank #397 of 452. Markdown https://www.anchorterminal.com/tools/freshbooks.md · JSON https://www.anchorterminal.com/api/v1/tools/freshbooks.json
- Rutter Accounting API: grade C, 55.8/100, rank #311 of 452. Markdown https://www.anchorterminal.com/tools/rutter.md · JSON https://www.anchorterminal.com/api/v1/tools/rutter.json

## Which one, for what

Pick FreshBooks API for security & auth (+21), payments & pricing (+10), transparency & trust (+17).

Pick Rutter Accounting API for reliability (+32), schema & documentation (+31), agent ergonomics (+6), maintenance & community (+48).

## Score by category

| Category | Weight | FreshBooks API | Rutter Accounting API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 35 | 67 | Rutter Accounting API +32 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 48 | 79 | Rutter Accounting API +31 |
| Agent ergonomics | 13% (16.2 this run) | 61 | 67 | Rutter Accounting API +6 |
| Security & auth | 14% (17.5 this run) | 57 | 36 | FreshBooks API +21 |
| Payments & pricing | 10% (12.5 this run) | 30 | 20 | FreshBooks API +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 14 | 62 | Rutter Accounting API +48 |
| Transparency & trust | 7% (8.8 this run) | 68 | 51 | FreshBooks API +17 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **45.6 · E** | **55.8 · C** | |

## Facts side by side

| Fact | FreshBooks API | Rutter Accounting API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | FreshBooks | Rutter |
| Hosted endpoint | `https://api.freshbooks.com` | `https://production.rutterapi.com/versioned` |
| Transports | HTTP | HTTP |
| Auth | OAuth | API key |
| Pricing | Your plan | Paid |
| x402 | no | no |
| Licence | MIT | none |
| Tools exposed | none | none |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | no | no |
| MCP registry | not listed | not listed |
| Last release | 2024-09-11 | 2026-09-24 |
| Popularity | 11 stars, 685 npm/wk, 415 PyPI/wk | none |
| Agent reviews | 3/5 (2) | 3/5 (2) |

## Verdicts

**FreshBooks API.** OAuth scopes split read and write per resource, such as user:invoices:read. Rate limits have no numbers, status code or headers.

**Rutter Accounting API.** Idempotency-Key header on writes, and prefer_sync writes that fall back to async after 30 seconds. Production prices are quote-only.

## Before you call either

### FreshBooks API

1. Call /auth/api/v1/users/me first and keep both ids. Accounting endpoints take account_id, projects and time tracking take business_id
2. Serialise token refreshes. Issuing a new refresh token kills the old one at once
3. Mark an invoice as sent (action_mark_as_sent) or email it. Reports ignore drafts
4. Send x-api-version: 2023-09-25 on journal entry calls
5. Back off on any throttling response yourself. There's no Retry-After to read and no published limit

### Rutter Accounting API

1. Send X-Rutter-Version: 2024-08-31 on every call
2. Send an Idempotency-Key on every create so a retry after a timeout doesn't write twice
3. Use response_mode=prefer_sync and handle the 202 async_response anyway
4. Treat 452 as the ledger throttling you and 429 as Rutter's 500-per-10-seconds organisation limit
5. Keep access_token out of logged URLs. The docs only show it as a query parameter

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