# Square vs Wix Stores and eCommerce API

> Square scores 69.2 (B) on agent readiness against Wix Stores and eCommerce API's 61.4 (C), and leads in 5 of 7 scored categories. Wix Stores and eCommerce API leads on transparency & trust. Both do commerce products. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/square-vs-wix
- Markdown: https://www.anchorterminal.com/compare/square-vs-wix.md (~2,600 tokens)
- Slim: https://www.anchorterminal.com/compare/square-vs-wix.min.md (~780 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/square-vs-wix.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

Square scores 69.2 (B) on agent readiness against Wix Stores and eCommerce API's 61.4 (C), and leads in 5 of 7 scored categories. Wix Stores and eCommerce API leads on transparency & trust. Both do commerce products.

- Square: grade B, 69.2/100, rank #166 of 722. Markdown https://www.anchorterminal.com/tools/square.md · JSON https://www.anchorterminal.com/api/v1/tools/square.json
- Wix Stores and eCommerce API: grade C, 61.4/100, rank #364 of 722. Markdown https://www.anchorterminal.com/tools/wix.md · JSON https://www.anchorterminal.com/api/v1/tools/wix.json

## Which one, for what

### Square (B)

Good for: Agents working for a seller already on Square, on catalogue, inventory, orders, payment links and customers, online and in person.

Ahead on:
- Reliability, 58 against 48
- Schema & documentation, 87 against 76
- Agent ergonomics, 83 against 68
- Security & auth, 67 against 61
- Payments & pricing, 40 against 30

Also in its favour:
- Runs on your own machine

Watch for: The MCP server is marked beta, and the remote server reaches production data only

### Wix Stores and eCommerce API (C)

Good for: An agent managing a merchant's existing Wix store or building a headless storefront on Wix.

Ahead on:
- Transparency & trust, 77 against 70

Watch for: No numeric rate limit for the REST API was found in the reviewed documentation. The 429 guidance is to wait a minute and retry


## Score by category

| Category | Weight | Square | Wix Stores and eCommerce API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 58 | 48 | Square +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 87 | 76 | Square +11 |
| Agent ergonomics | 13% (16.2 this run) | 83 | 68 | Square +15 |
| Security & auth | 14% (17.5 this run) | 67 | 61 | Square +6 |
| Payments & pricing | 10% (12.5 this run) | 40 | 30 | Square +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 81 | 83 | Wix Stores and eCommerce API +2 |
| Transparency & trust | 7% (8.8 this run) | 70 | 77 | Wix Stores and eCommerce API +7 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **69.2 · B** | **61.4 · C** | |

## Facts side by side

| Fact | Square | Wix Stores and eCommerce API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Block, Inc. | Wix.com Ltd. |
| Hosted endpoint | `https://mcp.squareup.com/mcp` | `https://www.wixapis.com` |
| Transports | HTTP, Streamable HTTP, stdio | HTTP, Streamable HTTP, SSE (legacy) |
| Auth | OAuth or key | OAuth or key |
| Pricing | Pay per use | Freemium |
| x402 | no | no |
| Licence | Proprietary service under the Square Developer Terms of Service. The MCP server and the OpenAPI specification on GitHub are Apache 2.0, and the Node.js SDK is MIT | Proprietary service under the Wix Terms of Use. `@wix/sdk`, `@wix/stores` and the wix/skills repository are MIT. `@wix/mcp` states no licence |
| Tools exposed | 3 | 18 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | not listed | `com.wix/mcp` |
| Last release | 2026-09-16 | 2026-10-08 |
| Terms last updated | 2026-09-10 | couldn't be read |
| Privacy policy last updated | 2026-09-15 | couldn't be read |
| Customer content may train models | not found in the text | couldn't be read |
| Terms restrict automated access | yes | couldn't be read |
| Terms restrict benchmarking | yes | couldn't be read |
| Terms or service can change without notice | not found in the text | couldn't be read |
| Arbitration or class-action waiver | yes | couldn't be read |
| Popularity | 454k npm/wk, 72k PyPI/wk | 87k npm/wk |

## Verdicts

**Square.** The REST API has a public OpenAPI 3.0 spec, OAuth scopes split by read and write for each resource, idempotency keys on writes and a free sandbox. The MCP server is in beta and its remote instance reaches production only. No numeric REST rate limits or SLA were found, and the status page recorded widespread errors on 27 September 2026.

**Wix Stores and eCommerce API.** The developer docs are served as Markdown with an llms.txt index, and API keys carry permission scopes and a site restriction. No numeric REST rate limit or OpenAPI file was found, and status.wix.com records a platform-wide incident of 3 hours 17 minutes on 1 August 2026. A person must create the account and the key.

## Before you call either

### Square

1. Test against the sandbox first with the local MCP server and `SANDBOX=true`. The remote server at mcp.squareup.com reaches production only
2. Set `DISALLOW_WRITES=true` on the local MCP server when the task only reads
3. Call `get_service_info`, then `get_type_info`, before each `make_api_request`. The request body is otherwise untyped
4. Send a fresh `idempotency_key` on every write, and reuse it when retrying the same write
5. Pin `Square-Version` in each request. Use a page cursor within 5 minutes of receiving it

### Wix Stores and eCommerce API

1. Send the API key in `Authorization` with `wix-site-id` for site calls or `wix-account-id` for account calls, never both
2. Fetch the product first and pass `product.revision` on every Catalogue V3 update, or the call fails with 409
3. Use Cart V2 for new work. The older eCommerce Cart and Checkout APIs were deprecated on 5 August 2026
4. Request `cursorPaging.limit` of at most 100 on Query Products and use Search Products for lookups by name
5. Over MCP, read the method page with `ReadFullDocsArticle` before `CallWixSiteAPI`. Responses are cut at 50,000 characters by default

## Questions

### Which is better for AI agents, Square or Wix Stores and eCommerce API?

Square scores 69.2 (B) on agent readiness against Wix Stores and eCommerce API's 61.4 (C), and leads in 5 of 7 scored categories. Wix Stores and eCommerce API leads on transparency & trust.

### Do Square and Wix Stores and eCommerce API need an API key?

Both take an API key or an OAuth sign-in.

### Can an agent call Square and Wix Stores and eCommerce API without installing anything?

Yes. Square has a hosted endpoint at https://mcp.squareup.com/mcp and Wix Stores and eCommerce API at https://www.wixapis.com.


## For agents

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

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