# Avalara AvaTax vs Numeral

> Avalara AvaTax scores 68.8 (B) on agent readiness against Numeral's 49.3 (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/avalara-vs-numeral
- Markdown: https://www.anchorterminal.com/compare/avalara-vs-numeral.md (~2,250 tokens)
- Slim: https://www.anchorterminal.com/compare/avalara-vs-numeral.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/avalara-vs-numeral.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 Numeral's 49.3 (D), and leads in 6 of 7 scored categories. Both do tax calculate.

- Avalara AvaTax: grade B, 68.8/100, rank #172 of 722. Markdown https://www.anchorterminal.com/tools/avalara.md · JSON https://www.anchorterminal.com/api/v1/tools/avalara.json
- Numeral: grade D, 49.3/100, rank #611 of 722. Markdown https://www.anchorterminal.com/tools/numeral.md · JSON https://www.anchorterminal.com/api/v1/tools/numeral.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:
- Reliability, 62 against 25
- Agent ergonomics, 84 against 71
- Security & auth, 65 against 47
- Payments & pricing, 30 against 10
- Maintenance & community, 79 against 60
- Transparency & trust, 79 against 45

Watch for: Production rate limits are not published. The only numbers found are the trial limits and 5 calls a minute on report exports

### Numeral (D)

Good for: An agent working for a seller or platform that has a Numeral account and needs tax at checkout, committed transactions for filing, and read access to nexus, registrations and filings through MCP.

Watch for: No status page, uptime SLA or numeric rate limit was found. The product page says rate limits can be removed on request


## Score by category

| Category | Weight | Avalara AvaTax | Numeral | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 62 | 25 | Avalara AvaTax +37 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 85 | 87 | Numeral +2 |
| Agent ergonomics | 13% (16.2 this run) | 84 | 71 | Avalara AvaTax +13 |
| Security & auth | 14% (17.5 this run) | 65 | 47 | Avalara AvaTax +18 |
| Payments & pricing | 10% (12.5 this run) | 30 | 10 | Avalara AvaTax +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 79 | 60 | Avalara AvaTax +19 |
| Transparency & trust | 7% (8.8 this run) | 79 | 45 | Avalara AvaTax +34 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **68.8 · B** | **49.3 · D** | |

## Facts side by side

| Fact | Avalara AvaTax | Numeral |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Avalara, Inc. | Numeral Two, Inc. |
| Hosted endpoint | `https://rest.avatax.com/api/v2` | `https://api.numeralhq.com` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | API 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 Numeral's terms of service. The Go, Python and Node SDKs are Apache-2.0 |
| Tools exposed | 10 | 14 |
| Read-only variant documented | no | yes |
| llms.txt | yes | yes |
| MCP registry | `com.avalara/avatax` | not listed |
| Last release | 2026-09-16 | 2026-09-15 |
| Terms last updated | 2023-05-01 | no date given |
| Privacy policy last updated | 2022-08-08 | no document linked |
| 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 | yes | 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 | yes |
| Popularity | 5 stars, 331k npm/wk, 38k PyPI/wk | 0 stars, 9 npm/wk, 19 PyPI/wk |

## 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.

**Numeral.** Docs are written for agents, with a public OpenAPI spec for 32 operations, Markdown pages, llms.txt and a remote MCP server whose 14 tools are read-only by default. No status page, numeric rate limit or SLA was found, the API ignores idempotency keys, and API access is sold on a custom plan after a demo.

## 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

### Numeral

1. Send `X-API-Version: 2026-03-01` on every call to `https://api.numeralhq.com`. Merchant, platform and certificate endpoints reject requests without it
2. Commit with a stable `reference_order_id`. On `REFERENCE_ORDER_ID_ALREADY_EXISTS` look up the existing transaction, because `Idempotency-Key` is ignored
3. Commit before the calculation's `expires_at`. If it has expired, calculate again and commit the new `calculation_id` with the original `reference_order_id`
4. Send `amount` as the line total in minor units to `/tax/calculations` and as the per-unit price to `/tax/platform/calculations`
5. Start with an `sk_test_` key. Certificate endpoints and MCP certificate tools are live only and answer `TESTMODE_NOT_SUPPORTED` or `live_mode_required`

## Questions

### Which is better for AI agents, Avalara AvaTax or Numeral?

Avalara AvaTax scores 68.8 (B) on agent readiness against Numeral's 49.3 (D), and leads in 6 of 7 scored categories.

### Do Avalara AvaTax and Numeral need an API key?

Avalara AvaTax takes an API key or an OAuth sign-in. Numeral needs an API key.

### Can an agent call Avalara AvaTax and Numeral without installing anything?

Yes. Avalara AvaTax has a hosted endpoint at https://rest.avatax.com/api/v2 and Numeral at https://api.numeralhq.com.


## For agents

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

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