# Quaderno vs Zamp

> Quaderno scores 59.5 (C) on agent readiness against Zamp's 49.5 (D), and leads in 4 of 7 scored categories. Zamp leads on agent ergonomics and maintenance & community. Both do tax calculate. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/quaderno-vs-zamp
- Markdown: https://www.anchorterminal.com/compare/quaderno-vs-zamp.md (~2,200 tokens)
- Slim: https://www.anchorterminal.com/compare/quaderno-vs-zamp.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/quaderno-vs-zamp.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

Quaderno scores 59.5 (C) on agent readiness against Zamp's 49.5 (D), and leads in 4 of 7 scored categories. Zamp leads on agent ergonomics and maintenance & community. Both do tax calculate.

- Quaderno: grade C, 59.5/100, rank #427 of 722. Markdown https://www.anchorterminal.com/tools/quaderno.md · JSON https://www.anchorterminal.com/api/v1/tools/quaderno.json
- Zamp: grade D, 49.5/100, rank #609 of 722. Markdown https://www.anchorterminal.com/tools/zamp.md · JSON https://www.anchorterminal.com/api/v1/tools/zamp.json

## Which one, for what

### Quaderno (C)

Good for: An agent working for a SaaS, digital-goods or e-commerce seller that needs a tax rate at checkout, a record of each sale with location evidence, and compliant invoices, including Spanish Verifactu and TicketBAI.

Ahead on:
- Reliability, 91 against 72
- Schema & documentation, 77 against 44
- Payments & pricing, 30 against 20
- Transparency & trust, 76 against 50

Watch for: One API key reads and writes everything its user can reach. Scopes exist only on Connect OAuth tokens (read_only, read_write)

### Zamp (D)

Good for: An agent working for a US or Canadian seller that wants Zamp's team to register, file and remit, and needs calculation and transaction sync through a small API.

Ahead on:
- Agent ergonomics, 64 against 56
- Maintenance & community, 42 against 28

Also in its favour:
- Free to start without a card

Watch for: No OpenAPI file for the API. The one file on the docs host is the documentation platform's plant store sample


## Score by category

| Category | Weight | Quaderno | Zamp | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 91 | 72 | Quaderno +19 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 77 | 44 | Quaderno +33 |
| Agent ergonomics | 13% (16.2 this run) | 56 | 64 | Zamp +8 |
| Security & auth | 14% (17.5 this run) | 39 | 40 | Zamp +1 |
| Payments & pricing | 10% (12.5 this run) | 30 | 20 | Quaderno +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 28 | 42 | Zamp +14 |
| Transparency & trust | 7% (8.8 this run) | 76 | 50 | Quaderno +26 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **59.5 · C** | **49.5 · D** | |

## Facts side by side

| Fact | Quaderno | Zamp |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Recrea Systems, SL | Zamp Inc. |
| Hosted endpoint | `https://quadernoapp.com/api` | `https://api.zamp.com` |
| Transports | HTTP | HTTP |
| Auth | OAuth or key | API key |
| Pricing | Paid | Paid |
| x402 | no | no |
| Licence | Proprietary service under Quaderno's terms of service. The Ruby library on GitHub is MIT | Proprietary service under Zamp's Standard Terms and Conditions, which form part of a signed Order Form. The sandbox has its own Developer trial terms |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-07-04 | 2026-08-31 |
| Terms last updated | 2026-09-15 | no date given |
| Privacy policy last updated | 2024-05-16 | 2025-02-11 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | yes | yes |
| Terms restrict benchmarking | yes | yes |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 15 stars | none |

## Verdicts

**Quaderno.** A public OpenAPI 3.1 spec covers 92 operations, with a free sandbox and a status page showing no incident since July 2025. The API key has full account access, there are no idempotency keys, and the newest public API version is dated October 2024.

**Zamp.** A free 30-day sandbox key needs no card or sales call, and the docs are served as Markdown with llms.txt and a published limit of 1,000 requests a minute. There is no OpenAPI file, SDK, API changelog or published price, production keys come with a sales-led account, and the site footer says SOC 2 compliance is in progress.

## Before you call either

### Quaderno

1. Call GET https://quadernoapp.com/api/authorization first. Its `href` gives the account subdomain that every other call needs
2. Before retrying a failed POST /transactions, list invoices by `processor_id` to check whether the sale was recorded. There is no idempotency key
3. Treat GET /invoices/{id}/deliver as a write. It emails the invoice to the customer
4. Correct a final invoice with a credit note. DELETE on invoices returns 410 and PUT accepts only notes, tags, metadata and address fields
5. Read X-RateLimit-Remaining and X-RateLimit-Reset, and page with `created_before` and `limit` up to 100

### Zamp

1. Call `POST /calculations` for a quote and `POST /transactions` only when the sale is final. Put the returned `taxDue` in `taxCollected` when posting
2. Keep transaction and line item ids to 25 characters. A repeated `POST /transactions` with an existing id returns 409 `CONFLICT`, so a retry doesn't create a second record
3. For a refund, post a new transaction with `parentId` set to the sale's id and a negative `quantity`. Never send a negative `amount` on a line item
4. Send `shipToAddress.state` and `country` set to CA for Canadian orders. `POST /addresses` validates US addresses only
5. Page lists with `limit` (1 to 100, default 10) and `cursor` until `nextCursor` is null. `GET /transactions` returns only transactions written with the same key
6. Don't store sensitive or personal data in the sandbox. Trial data is deleted after 30 days and the trial terms forbid live customer data

## Questions

### Which is better for AI agents, Quaderno or Zamp?

Quaderno scores 59.5 (C) on agent readiness against Zamp's 49.5 (D), and leads in 4 of 7 scored categories. Zamp leads on agent ergonomics and maintenance & community.

### Do Quaderno and Zamp need an API key?

Quaderno takes an API key or an OAuth sign-in. Zamp needs an API key.

### Can an agent call Quaderno and Zamp without installing anything?

Yes. Quaderno has a hosted endpoint at https://quadernoapp.com/api and Zamp at https://api.zamp.com.


## For agents

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

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