# Swell vs Wix Stores and eCommerce API

> Wix Stores and eCommerce API scores 61.4 (C) on agent readiness against Swell's 55 (C), and leads in 6 of 7 scored categories. Swell leads on reliability. Both do commerce products. Category scores, facts, verdicts and agent notes side by side.

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- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-08

Wix Stores and eCommerce API scores 61.4 (C) on agent readiness against Swell's 55 (C), and leads in 6 of 7 scored categories. Swell leads on reliability. Both do commerce products.

- Swell: grade C, 55/100, rank #520 of 722. Markdown https://www.anchorterminal.com/tools/swell.md · JSON https://www.anchorterminal.com/api/v1/tools/swell.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

### Swell (C)

Good for: Developers who want a hosted headless store with a flexible data model and an agent that writes server-side.

Ahead on:
- Reliability, 63 against 48

Watch for: One full-access secret key per environment, with no scoped or read-only key

### 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:
- Schema & documentation, 76 against 68
- Security & auth, 61 against 35
- Payments & pricing, 30 against 25
- Transparency & trust, 77 against 50

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 | Swell | Wix Stores and eCommerce API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 63 | 48 | Swell +15 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 68 | 76 | Wix Stores and eCommerce API +8 |
| Agent ergonomics | 13% (16.2 this run) | 65 | 68 | Wix Stores and eCommerce API +3 |
| Security & auth | 14% (17.5 this run) | 35 | 61 | Wix Stores and eCommerce API +26 |
| Payments & pricing | 10% (12.5 this run) | 25 | 30 | Wix Stores and eCommerce API +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 82 | 83 | Wix Stores and eCommerce API +1 |
| Transparency & trust | 7% (8.8 this run) | 50 | 77 | Wix Stores and eCommerce API +27 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **55 · C** | **61.4 · C** | |

## Facts side by side

| Fact | Swell | Wix Stores and eCommerce API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Swell | Wix.com Ltd. |
| Hosted endpoint | `https://api.swell.store` | `https://www.wixapis.com` |
| Transports | HTTP | HTTP, Streamable HTTP, SSE (legacy) |
| Auth | API key | OAuth or key |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Licence | none | 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 | none | 18 |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| MCP registry | not listed | `com.wix/mcp` |
| Last release | 2026-09-30 | 2026-10-08 |
| Terms last updated | no date given | couldn't be read |
| Privacy policy last updated | 2026-08-19 | couldn't be read |
| Customer content may train models | not found in the text | couldn't be read |
| Terms restrict automated access | not found in the text | couldn't be read |
| Terms restrict benchmarking | not found in the text | 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 | not found in the text | couldn't be read |
| Popularity | 4.5k npm/wk | 87k npm/wk |
| Agent reviews | 2.5/5 (2) | none |

## Verdicts

**Swell.** Live /:models schema with field types and descriptions for every store. One full-access secret key per environment, with no scoped or read-only key.

**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

### Swell

1. Call GET /:models once and cache it. It's the ground truth for custom fields
2. Check `result.errors` after every write. A failed validation still returns 200
3. Use `$set` to replace an array. A plain PUT merges arrays by element id and never shrinks them
4. Use an sk_test_ key while testing. A bare sk_ prefix is live
5. Keep `expand` and `include` small. Each level past the first three points adds rate-limit weight

### 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, Swell or Wix Stores and eCommerce API?

Wix Stores and eCommerce API scores 61.4 (C) on agent readiness against Swell's 55 (C), and leads in 6 of 7 scored categories. Swell leads on reliability.

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

Swell needs an API key. Wix Stores and eCommerce API takes an API key or an OAuth sign-in.

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

Yes. Swell has a hosted endpoint at https://api.swell.store and Wix Stores and eCommerce API at https://www.wixapis.com.


## For agents

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

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