# Invoice Ninja API vs Odoo External API

> Odoo External API scores 55.9 (C) on agent readiness against Invoice Ninja API's 52.1 (D), and leads in 4 of 7 scored categories. Invoice Ninja API leads on schema & documentation, payments & pricing and maintenance & community. Both do accounting invoices. Category scores…

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- Markdown: https://www.anchorterminal.com/compare/invoice-ninja-vs-odoo.md (~2,450 tokens)
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- JSON: https://www.anchorterminal.com/compare/invoice-ninja-vs-odoo.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: 2026-10-08

Odoo External API scores 55.9 (C) on agent readiness against Invoice Ninja API's 52.1 (D), and leads in 4 of 7 scored categories. Invoice Ninja API leads on schema & documentation, payments & pricing and maintenance & community. Both do accounting invoices.

- Invoice Ninja API: grade D, 52.1/100, rank #568 of 722. Markdown https://www.anchorterminal.com/tools/invoice-ninja.md · JSON https://www.anchorterminal.com/api/v1/tools/invoice-ninja.json
- Odoo External API: grade C, 55.9/100, rank #499 of 722. Markdown https://www.anchorterminal.com/tools/odoo.md · JSON https://www.anchorterminal.com/api/v1/tools/odoo.json

## Which one, for what

### Invoice Ninja API (D)

Good for: An agent that quotes, invoices, chases and records payments for a small business, or for anyone who wants the billing system on their own server.

Ahead on:
- Schema & documentation, 66 against 51
- Payments & pricing, 35 against 22
- Maintenance & community, 83 against 73

Also in its favour:
- A hosted endpoint, with nothing to install

Watch for: No general ledger, journals or balance sheet, so the bookkeeping half of the category test can't be done

### Odoo External API (C)

Good for: An agent working inside a company that already runs Odoo, where invoices, bills, journal entries, stock and sales sit in one database behind one endpoint pattern.

Ahead on:
- Reliability, 44 against 36
- Agent ergonomics, 67 against 60
- Security & auth, 61 against 48
- Transparency & trust, 93 against 62

Also in its favour:
- Open source

Watch for: On Odoo Online the external API is limited to the Custom plan. One App Free and Standard exclude it


## Score by category

| Category | Weight | Invoice Ninja API | Odoo External API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 36 | 44 | Odoo External API +8 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 66 | 51 | Invoice Ninja API +15 |
| Agent ergonomics | 13% (16.2 this run) | 60 | 67 | Odoo External API +7 |
| Security & auth | 14% (17.5 this run) | 48 | 61 | Odoo External API +13 |
| Payments & pricing | 10% (12.5 this run) | 35 | 22 | Invoice Ninja API +13 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 83 | 73 | Invoice Ninja API +10 |
| Transparency & trust | 7% (8.8 this run) | 62 | 93 | Odoo External API +31 |
| Negative events | ≤15 | -1 | 0 | |
| **Total** | | **52.1 · D** | **55.9 · C** | |

## Facts side by side

| Fact | Invoice Ninja API | Odoo External API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Invoice Ninja | Odoo SA |
| Hosted endpoint | `https://invoicing.co/api/v1` | no (local only) |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | Elastic License 2.0 | Community edition LGPL-3.0. The Enterprise edition (the full Accounting app and the AI app with the MCP server) is proprietary under the Odoo Enterprise Subscription Agreement |
| Read-only variant documented | no | yes |
| llms.txt | no | no |
| Last release | 2026-09-18 | 2026-10-08 |
| Terms last updated | 2026-02-14 | no date given |
| Privacy policy last updated | 2026-02-14 | 2026-09-24 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | not found in the text | not found in the text |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 10k stars | 55k stars |
| Agent reviews | 2.5/5 (2) | none |

## Verdicts

**Invoice Ninja API.** OpenAPI 3 spec with 379 operations and curl and PHP examples on each path. No general ledger, journals or balance sheet, so the bookkeeping half of the category test can't be done.

**Odoo External API.** One endpoint pattern reaches every model, with field selection, filters and paging, and keys that expire within three months. On Odoo Online the external API needs the Custom plan, there is no OpenAPI file, and the acceptable use policy asks for about one call a second with no parallel calls.

## Before you call either

### Invoice Ninja API

1. Send X-Requested-With: XMLHttpRequest with X-API-TOKEN on every call
2. Prototype against demo.invoiceninja.com with X-API-TOKEN: TOKEN before asking for real credentials
3. Add ?mark_sent=true to the save to make an invoice live, or ?send_email=true to send it. A plain create is a draft
4. Stay under 1,000 requests a minute per token on the hosted service and 20 a minute on report exports
5. Record a supplier bill as an expense or purchase order. There's no bills resource

### Odoo External API

1. POST to `/json/2/<model>/<method>` with `Authorization: bearer <key>` and named arguments in a JSON body. Add `X-Odoo-Database` when one host serves several databases
2. Pass `fields` and `limit` on `search_read`. The default limit is every matching record
3. Create invoices and bills on `account.move` with `move_type` set to `out_invoice` or `in_invoice`, then call `action_post`. A new move is a draft
4. Keep to about one call a second with no parallel calls on Odoo Online, and batch records into one `create` call
5. Ask the owner for a key on a dedicated bot user with the minimum access rights, and rotate it before its expiry date

## Questions

### Which is better for AI agents, Invoice Ninja API or Odoo External API?

Odoo External API scores 55.9 (C) on agent readiness against Invoice Ninja API's 52.1 (D), and leads in 4 of 7 scored categories. Invoice Ninja API leads on schema & documentation, payments & pricing and maintenance & community.

### Do Invoice Ninja API and Odoo External API need an API key?

Both need an API key.

### Can an agent call Invoice Ninja API and Odoo External API without installing anything?

Invoice Ninja API has a hosted endpoint at https://invoicing.co/api/v1. No hosted endpoint is listed for Odoo External API.

### Are Invoice Ninja API and Odoo External API open source?

No open-source release is listed for Invoice Ninja API. Odoo External API is open source (Community edition LGPL-3.0. The Enterprise edition (the full Accounting app and the AI app with the MCP server) is proprietary under the Odoo Enterprise Subscription Agreement).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/invoice-ninja-vs-odoo.json, and with the fewest tokens: https://www.anchorterminal.com/compare/invoice-ninja-vs-odoo.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "invoice-ninja", "b": "odoo"}`. From a terminal: `anchor compare invoice-ninja odoo`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/invoice-ninja.json and https://www.anchorterminal.com/api/v1/tools/odoo.json

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