# Anrok vs Fonoa

> Anrok scores 61.6 (C) on agent readiness against Fonoa's 51.7 (D), and leads in 6 of 7 scored categories. Both do tax calculate. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/anrok-vs-fonoa
- Markdown: https://www.anchorterminal.com/compare/anrok-vs-fonoa.md (~2,100 tokens)
- Slim: https://www.anchorterminal.com/compare/anrok-vs-fonoa.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/anrok-vs-fonoa.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

Anrok scores 61.6 (C) on agent readiness against Fonoa's 51.7 (D), and leads in 6 of 7 scored categories. Both do tax calculate.

- Anrok: grade C, 61.6/100, rank #361 of 722. Markdown https://www.anchorterminal.com/tools/anrok.md · JSON https://www.anchorterminal.com/api/v1/tools/anrok.json
- Fonoa: grade D, 51.7/100, rank #575 of 722. Markdown https://www.anchorterminal.com/tools/fonoa.md · JSON https://www.anchorterminal.com/api/v1/tools/fonoa.json

## 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 66
- Agent ergonomics, 70 against 64
- Security & auth, 59 against 47
- Payments & pricing, 15 against 3
- Transparency & trust, 54 against 48

Watch for: No self-serve signup. Starter is $100 per market a month through "Talk to us", and Custom is quoted by sales

### Fonoa (D)

Good for: An agent working for a company that already has a Fonoa contract and needs tax ID validation, VAT or GST calculation, or e-invoice reporting across many countries through one API.

Watch for: No self-serve signup. Sandbox, demo and production keys are issued by Fonoa after contact by email or the sales form


## Score by category

| Category | Weight | Anrok | Fonoa | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 88 | 66 | Anrok +22 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 71 | 68 | Anrok +3 |
| Agent ergonomics | 13% (16.2 this run) | 70 | 64 | Anrok +6 |
| Security & auth | 14% (17.5 this run) | 59 | 47 | Anrok +12 |
| Payments & pricing | 10% (12.5 this run) | 15 | 3 | Anrok +12 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 47 | 49 | Fonoa +2 |
| Transparency & trust | 7% (8.8 this run) | 54 | 48 | Anrok +6 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **61.6 · C** | **51.7 · D** | |

## Facts side by side

| Fact | Anrok | Fonoa |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Anrok, Inc. | Fonoa Technologies Limited |
| Hosted endpoint | `https://api.anrok.com` | `https://api.fonoa.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. The API contract is not published. The public Terms of Service took effect on 14 May 2020 and name older seller sites |
| Tools exposed | 31 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-06 | 2026-10-02 |
| Terms last updated | 2026-07-01 | no document linked |
| Privacy policy last updated | 2026-07-01 | no date given |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | yes |  |
| Terms restrict benchmarking | yes |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | 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.

**Fonoa.** The API reference is served as Markdown with an OpenAPI definition on each endpoint page, and e-invoicing submissions are idempotent by `transaction_id`. API keys are issued by Fonoa staff after contact, no price, rate limit or changelog is published, and the only public terms date from May 2020 and cover older seller sites.

## Before you call either

### Anrok

1. Send every call as a POST with a JSON body to https://api.anrok.com, including reads such as /v1/seller/products/list
2. Call createEphemeral for a quote and createOrUpdate only when the invoice is final. createOrUpdate saves the transaction for filing
3. Reuse the same transaction id on a retry. createOrUpdate overwrites by id, so a repeat doesn't create a second record
4. 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
5. On 429 wait the number of seconds in Retry-After. The default limit is 10 requests a second per seller account

### Fonoa

1. Send the key in the `Ocp-Apim-Subscription-Key` header. Use the sandbox key at https://sandbox.fonoa.com and the production key at https://api.fonoa.com
2. Treat validations and e-invoicing submissions as asynchronous. POST, then poll the GET endpoint or wait for the webhook, and avoid tight polling
3. Reuse the same `transaction_id` on a retry of `/v1/transactions`. A transaction already processed is not processed again
4. Commit a calculation with POST `/tax/v2/calculations/<uuid>/commit` only when the sale is final. The commit adds it to revenue tracking
5. Ask the Fonoa contact to configure webhooks. There is no API for it, and always fetch `resource_url` as given in the webhook

## Questions

### Which is better for AI agents, Anrok or Fonoa?

Anrok scores 61.6 (C) on agent readiness against Fonoa's 51.7 (D), and leads in 6 of 7 scored categories.

### Do Anrok and Fonoa need an API key?

Anrok takes an API key or an OAuth sign-in. Fonoa needs an API key.

### Can an agent call Anrok and Fonoa without installing anything?

Yes. Anrok has a hosted endpoint at https://api.anrok.com and Fonoa at https://api.fonoa.com.


## For agents

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

## Other comparisons with Anrok or Fonoa

- [Anrok vs Avalara AvaTax](https://www.anchorterminal.com/compare/anrok-vs-avalara.md)
- [Anrok vs Kintsugi](https://www.anchorterminal.com/compare/anrok-vs-kintsugi.md)
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- [Anrok vs TaxCloud](https://www.anchorterminal.com/compare/anrok-vs-taxcloud.md)
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- [Anrok vs Vertex O Series](https://www.anchorterminal.com/compare/anrok-vs-vertex-tax.md)
- [Anrok vs Zamp](https://www.anchorterminal.com/compare/anrok-vs-zamp.md)
- [Avalara AvaTax vs Fonoa](https://www.anchorterminal.com/compare/avalara-vs-fonoa.md)
- [Fonoa vs Kintsugi](https://www.anchorterminal.com/compare/fonoa-vs-kintsugi.md)
- [Fonoa vs Numeral](https://www.anchorterminal.com/compare/fonoa-vs-numeral.md)
- [Fonoa vs Quaderno](https://www.anchorterminal.com/compare/fonoa-vs-quaderno.md)
- [Fonoa vs TaxCloud](https://www.anchorterminal.com/compare/fonoa-vs-taxcloud.md)
- [Fonoa vs TaxJar](https://www.anchorterminal.com/compare/fonoa-vs-taxjar.md)
- [Fonoa vs Vertex O Series](https://www.anchorterminal.com/compare/fonoa-vs-vertex-tax.md)
- [Fonoa vs Zamp](https://www.anchorterminal.com/compare/fonoa-vs-zamp.md)