# Avalara AvaTax vs Quaderno > Avalara AvaTax scores 68.8 (B) on agent readiness against Quaderno's 59.5 (C), and leads in 5 of 7 scored categories. Quaderno leads on reliability. Both do tax calculate. Category scores, facts, verdicts and agent notes side by side. - Canonical: https://www.anchorterminal.com/compare/avalara-vs-quaderno - Markdown: https://www.anchorterminal.com/compare/avalara-vs-quaderno.md (~2,000 tokens) - Slim: https://www.anchorterminal.com/compare/avalara-vs-quaderno.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts) - JSON: https://www.anchorterminal.com/compare/avalara-vs-quaderno.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 Avalara AvaTax scores 68.8 (B) on agent readiness against Quaderno's 59.5 (C), and leads in 5 of 7 scored categories. Quaderno leads on reliability. Both do tax calculate. - Avalara AvaTax: grade B, 68.8/100, rank #162 of 629. Markdown https://www.anchorterminal.com/tools/avalara.md · JSON https://www.anchorterminal.com/api/v1/tools/avalara.json - Quaderno: grade C, 59.5/100, rank #377 of 629. Markdown https://www.anchorterminal.com/tools/quaderno.md · JSON https://www.anchorterminal.com/api/v1/tools/quaderno.json ## Which one, for what ### Avalara AvaTax (B) Good for: An agent that must calculate and record US sales tax at address level, with VAT and GST in other countries, and hand the records to filing. Ahead on: - Schema & documentation, 85 against 77 - Agent ergonomics, 84 against 56 - Security & auth, 65 against 39 - Maintenance & community, 79 against 28 Watch for: Production rate limits are not published. The only numbers found are the trial limits and 5 calls a minute on report exports ### 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 62 Watch for: One API key reads and writes everything its user can reach. Scopes exist only on Connect OAuth tokens (read_only, read_write) ## Score by category | Category | Weight | Avalara AvaTax | Quaderno | Edge | | --- | --- | --- | --- | --- | | Reliability | 16% (20 this run) | 62 | 91 | Quaderno +29 | | Performance | 10%, pending | pending | pending | not scored in this run | | Schema & documentation | 13% (16.2 this run) | 85 | 77 | Avalara AvaTax +8 | | Agent ergonomics | 13% (16.2 this run) | 84 | 56 | Avalara AvaTax +28 | | Security & auth | 14% (17.5 this run) | 65 | 39 | Avalara AvaTax +26 | | Payments & pricing | 10% (12.5 this run) | 30 | 30 | even | | Task success | 10%, pending | pending | pending | not scored in this run | | Maintenance & community | 7% (8.8 this run) | 79 | 28 | Avalara AvaTax +51 | | Transparency & trust | 7% (8.8 this run) | 79 | 76 | Avalara AvaTax +3 | | Negative events | ≤15 | 0 | 0 | | | **Total** | | **68.8 · B** | **59.5 · C** | | ## Facts side by side | Fact | Avalara AvaTax | Quaderno | | --- | --- | --- | | Kind | HTTP API | HTTP API | | Vendor | Avalara, Inc. | Recrea Systems, SL | | Hosted endpoint | `https://rest.avatax.com/api/v2` | `https://quadernoapp.com/api` | | Transports | HTTP, Streamable HTTP | HTTP | | Auth | OAuth or key | OAuth or key | | Pricing | Paid | Paid | | x402 | no | no | | Licence | Proprietary service under the Avalara Service Terms. The SDKs on GitHub are Apache-2.0. The MCP repository holds a README only, with no licence file | Proprietary service under Quaderno's terms of service. The Ruby library on GitHub is MIT | | Tools exposed | 10 | none | | Read-only variant documented | no | no | | llms.txt | yes | yes | | MCP registry | `com.avalara/avatax` | not listed | | Last release | 2026-09-16 | 2026-07-04 | | Terms last updated | 2023-05-01 | 2026-09-15 | | Privacy policy last updated | 2022-08-08 | 2024-05-16 | | Customer content may train models | not found in the text | not found in the text | | Terms restrict automated access | not found in the text | yes | | Terms restrict benchmarking | yes | yes | | Terms or service can change without notice | not found in the text | yes | | Arbitration or class-action waiver | not found in the text | not found in the text | | Popularity | 5 stars, 331k npm/wk, 38k PyPI/wk | 15 stars | ## Verdicts **Avalara AvaTax.** The REST API has a public Swagger file with 491 operations, a Markdown page per endpoint and a 90-day trial with no card. Production rate limits and prices per transaction are not published, the API patch notes stop at April 2023, and the tax calculation service was degraded for about 23 hours on 5 and 6 October 2026. **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. ## Before you call either ### Avalara AvaTax 1. Omit `type` or send SalesOrder for an estimate. A type ending in Invoice is recorded, and `commit` set to true locks it for reporting 2. Retry a timed-out invoice with CreateOrAdjustTransaction, not CreateTransaction, which errors when a committed transaction has the same code 3. Use sandbox-rest.avatax.com with sandbox credentials for tests. Production is rest.avatax.com and the two accounts are separate 4. Add `$include=SummaryOnly` or LinesOnly to shrink transaction responses, and page lists with `$top` (1,000 at most) and `$skip` 5. Call /api/v2/utilities/ping first. It answers without credentials and shows whether the credentials sent were accepted ### 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 ## Questions ### Which is better for AI agents, Avalara AvaTax or Quaderno? Avalara AvaTax scores 68.8 (B) on agent readiness against Quaderno's 59.5 (C), and leads in 5 of 7 scored categories. Quaderno leads on reliability. ### Do Avalara AvaTax and Quaderno need an API key? Both take an API key or an OAuth sign-in. ### Can an agent call Avalara AvaTax and Quaderno without installing anything? Yes. Avalara AvaTax has a hosted endpoint at https://rest.avatax.com/api/v2 and Quaderno at https://quadernoapp.com/api. ## For agents - This comparison as JSON: https://www.anchorterminal.com/compare/avalara-vs-quaderno.json, and with the fewest tokens: https://www.anchorterminal.com/compare/avalara-vs-quaderno.min.md - Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "avalara", "b": "quaderno"}`. From a terminal: `anchor compare avalara quaderno` - Each listing in full: https://www.anchorterminal.com/api/v1/tools/avalara.json and https://www.anchorterminal.com/api/v1/tools/quaderno.json ## Other comparisons with Avalara AvaTax or Quaderno - [Anrok vs Avalara AvaTax](https://www.anchorterminal.com/compare/anrok-vs-avalara.md) - [Anrok vs Quaderno](https://www.anchorterminal.com/compare/anrok-vs-quaderno.md) - [Avalara AvaTax vs TaxJar](https://www.anchorterminal.com/compare/avalara-vs-taxjar.md) - [Avalara AvaTax vs Vertex O Series](https://www.anchorterminal.com/compare/avalara-vs-vertex-tax.md) - [Quaderno vs TaxJar](https://www.anchorterminal.com/compare/quaderno-vs-taxjar.md) - [Quaderno vs Vertex O Series](https://www.anchorterminal.com/compare/quaderno-vs-vertex-tax.md)