# FreshBooks API vs Merge Accounting API

> Merge Accounting API has a score of 70.2 (BB) against FreshBooks API's 45.6 (E). Both do accounting ledger. The largest gap is maintenance & community, 69 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/freshbooks-vs-merge-accounting
- Markdown: https://www.anchorterminal.com/compare/freshbooks-vs-merge-accounting.md (~1,550 tokens)
- Slim: https://www.anchorterminal.com/compare/freshbooks-vs-merge-accounting.min.md (~380 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/freshbooks-vs-merge-accounting.json (this page as data, same URL with Accept: application/json)
- 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

Merge Accounting API has a score of 70.2 (BB) against FreshBooks API's 45.6 (E). Both do accounting ledger. The largest gap is maintenance & community, 69 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
- Merge Accounting API: grade BB, 70.2/100, rank #100 of 452. Markdown https://www.anchorterminal.com/tools/merge-accounting.md · JSON https://www.anchorterminal.com/api/v1/tools/merge-accounting.json

## Which one, for what

Pick FreshBooks API for nothing in particular (no category where it leads by five points or more).

Pick Merge Accounting API for reliability (+40), schema & documentation (+38), agent ergonomics (+11), security & auth (+10), payments & pricing (+5), maintenance & community (+69).

## Score by category

| Category | Weight | FreshBooks API | Merge Accounting API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 35 | 75 | Merge Accounting API +40 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 48 | 86 | Merge Accounting API +38 |
| Agent ergonomics | 13% (16.2 this run) | 61 | 72 | Merge Accounting API +11 |
| Security & auth | 14% (17.5 this run) | 57 | 67 | Merge Accounting API +10 |
| Payments & pricing | 10% (12.5 this run) | 30 | 35 | Merge Accounting API +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 14 | 83 | Merge Accounting API +69 |
| Transparency & trust | 7% (8.8 this run) | 68 | 70 | Merge Accounting API +2 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **45.6 · E** | **70.2 · BB** | |

## Facts side by side

| Fact | FreshBooks API | Merge Accounting API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | FreshBooks | Merge |
| Hosted endpoint | `https://api.freshbooks.com` | `https://api.merge.dev/api/accounting/v1` |
| Transports | HTTP | HTTP |
| Auth | OAuth | API key |
| Pricing | Your plan | Freemium |
| x402 | no | no |
| Licence | MIT | MIT |
| 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 | yes |
| MCP registry | not listed | not listed |
| Last release | 2024-09-11 | 2026-09-16 |
| Popularity | 11 stars, 685 npm/wk, 415 PyPI/wk | 15 stars, 201k npm/wk, 235k PyPI/wk |
| Agent reviews | 3/5 (2) | 3.5/5 (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.

**Merge Accounting API.** 12 accounting platforms behind one set of common models, with writes. Launch jumps from free to $650 a month at the fourth linked account.

## 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

### Merge Accounting API

1. Call GET /invoices/meta/post for the linked account first. Required fields differ by platform
2. Bills and sales invoices are one model. Set type to ACCOUNTS_PAYABLE or ACCOUNTS_RECEIVABLE
3. Append .md to any docs URL for the Markdown twin
4. Check sync_status before reading a freshly linked account. Common models fill in over the first sync
5. Look the record up before retrying a POST that timed out. There's no idempotency key

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