# Avalara AvaTax vs Vertex O Series (slim)

> Avalara AvaTax scores 68.8 (B) on agent readiness against Vertex O Series's 54.7 (C), and leads in 6 of 7 scored categories. Both do tax calculate. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/avalara-vs-vertex-tax.md (~2,050 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/avalara-vs-vertex-tax.json · canonical https://www.anchorterminal.com/compare/avalara-vs-vertex-tax
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

Avalara AvaTax scores 68.8 (B) on agent readiness against Vertex O Series's 54.7 (C), and leads in 6 of 7 scored categories. Both do tax calculate.

- Avalara AvaTax: B 68.8, rank #162 of 629 · https://www.anchorterminal.com/tools/avalara.min.md
- Vertex O Series: C 54.7, rank #464 of 629 · https://www.anchorterminal.com/tools/vertex-tax.min.md
- Avalara AvaTax, 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 74; Agent ergonomics, 84 against 51; Security & auth, 65 against 57; Payments & pricing, 30 against 0; Maintenance & community, 79 against 62; Transparency & trust, 79 against 68.
- Vertex O Series, good for An agent working inside a company that already has an O Series licence, for quotes, invoice tax, tax area lookups and tax configuration across sales tax, use tax and VAT.

| Category | Avalara AvaTax | Vertex O Series |
| --- | --- | --- |
| Reliability (16%) | 62 | 65 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 85 | 74 |
| Agent ergonomics (13%) | 84 | 51 |
| Security & auth (14%) | 65 | 57 |
| Payments & pricing (10%) | 30 | 0 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 79 | 62 |
| Transparency & trust (7%) | 79 | 68 |

| Fact (where they differ) | Avalara AvaTax | Vertex O Series |
| --- | --- | --- |
| Vendor | Avalara, Inc. | Vertex, Inc. |
| Hosted endpoint | `https://rest.avatax.com/api/v2` | `https://calcconnect.vertexsmb.com/vertex-ws/v2` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | OAuth or key | OAuth |
| 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 a customer agreement with Vertex, Inc. that isn't published |
| Tools exposed | 10 | none |
| llms.txt | yes | no |
| MCP registry | `com.avalara/avatax` | not listed |
| Last release | 2026-09-16 | 2026-09-25 |
| Terms last updated | 2023-05-01 | no date given |
| Privacy policy last updated | 2022-08-08 | no date given |
| Terms restrict benchmarking | yes | not found in the text |
| Popularity | 5 stars, 331k npm/wk, 38k PyPI/wk | none |