Head to head · Tax calculate · October 2026 research run
Anrok vs Zamp
Anrok scores 61.6 (C) on agent readiness against Zamp's 49.5 (D), and leads in 6 of 7 scored categories. Zamp leads on payments & pricing. Both do tax calculate.
Which one, for what
Anrok C
Good for An agent working for a software or ecommerce seller that already uses Anrok and wants calculation, exemption certificates and filing status in one account.
Ahead on
- Reliability, 88 against 72
- Schema & documentation, 71 against 44
- Agent ergonomics, 70 against 64
- Security & auth, 59 against 40
- Maintenance & community, 47 against 42
Watch for
No self-serve signup. Starter is $100 per market a month through "Talk to us", and Custom is quoted by sales
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
- Payments & pricing, 20 against 15
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 this run | Anrok | Zamp | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 88 | 72 | Anrok +16 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 71 | 44 | Anrok +27 |
| Agent ergonomics | 13%16.2 | 70 | 64 | Anrok +6 |
| Security & auth | 14%17.5 | 59 | 40 | Anrok +19 |
| Payments & pricing | 10%12.5 | 15 | 20 | Zamp +5 |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 47 | 42 | Anrok +5 |
| Transparency & trust | 7%8.8 | 54 | 50 | Anrok +4 |
| Negative events | ≤15 | 0 | 0 | |
| Total | 61.6 · C | 49.5 · D |
Facts side by side
| Fact | Anrok | Zamp |
|---|---|---|
| Kind | HTTP API | HTTP API |
| Vendor | Anrok, Inc. | Zamp Inc. |
| Hosted endpoint | https://api.anrok.com | https://api.zamp.com |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | OAuth or key | API key |
| Pricing | Paid | Paid |
| x402 | no | no |
| Licence | Proprietary service under the Anrok SaaS Services Agreement. The OpenAPI file states "All rights reserved" | 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 |
| Tools exposed | 31 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-06 | 2026-08-31 |
| Terms last updated | 2026-07-01 | no date given |
| Privacy policy last updated | 2026-07-01 | 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 | 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 |
Verdicts
Anrok
The public OpenAPI 3.1 spec covers 26 operations with typed error codes, and the remote MCP server uses OAuth 2.1 with six scopes and keeps voids, refunds and filing approval away from the model. Access needs a seller account arranged through sales, API keys carry no scopes, and no API changelog, SDK or subprocessor list was found.
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
Anrok
- Send every call as a POST with a JSON body to https://api.anrok.com, including reads such as /v1/seller/products/list
- Call createEphemeral for a quote and createOrUpdate only when the invoice is final. createOrUpdate saves the transaction for filing
- Reuse the same transaction id on a retry. createOrUpdate overwrites by id, so a repeat doesn't create a second record
- Expect transactionFrozenForFiling once a transaction is on a filed return. Negate it with createNegation and write a new id with a suffix such as :s2
- On 429 wait the number of seconds in Retry-After. The default limit is 10 requests a second per seller account
Zamp
- Call
POST /calculationsfor a quote andPOST /transactionsonly when the sale is final. Put the returnedtaxDueintaxCollectedwhen posting - Keep transaction and line item ids to 25 characters. A repeated
POST /transactionswith an existing id returns 409CONFLICT, so a retry doesn't create a second record - For a refund, post a new transaction with
parentIdset to the sale's id and a negativequantity. Never send a negativeamounton a line item - Send
shipToAddress.stateandcountryset to CA for Canadian orders.POST /addressesvalidates US addresses only - Page lists with
limit(1 to 100, default 10) andcursoruntilnextCursoris null.GET /transactionsreturns only transactions written with the same key - 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, Anrok or Zamp?
Anrok scores 61.6 (C) on agent readiness against Zamp's 49.5 (D), and leads in 6 of 7 scored categories. Zamp leads on payments & pricing.
Do Anrok and Zamp need an API key?
Anrok takes an API key or an OAuth sign-in. Zamp needs an API key.
Can an agent call Anrok and Zamp without installing anything?
Yes. Anrok has a hosted endpoint at https://api.anrok.com and Zamp at https://api.zamp.com.
Other comparisons with Anrok or Zamp
Machine-readable
- This page as Markdown
/compare/anrok-vs-zamp.md· slim.min.md· JSON.json(or sendAccept: text/markdown) - Each listing in full
/api/v1/tools/anrok.json·/api/v1/tools/zamp.json - From a terminal
anchor compare anrok zamp(the CLI) - Over MCP
compare_tools {"a": "anrok", "b": "zamp"}at/mcp, no key