# Square vs WooCommerce API + MCP

> WooCommerce API + MCP scores 72.9 (BB) on agent readiness against Square's 69.2 (B), and leads in 4 of 7 scored categories. Square leads on schema & documentation and security & auth. Both do commerce products. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/square-vs-woocommerce
- Markdown: https://www.anchorterminal.com/compare/square-vs-woocommerce.md (~2,550 tokens)
- Slim: https://www.anchorterminal.com/compare/square-vs-woocommerce.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/square-vs-woocommerce.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

WooCommerce API + MCP scores 72.9 (BB) on agent readiness against Square's 69.2 (B), and leads in 4 of 7 scored categories. Square leads on schema & documentation and security & auth. 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
- WooCommerce API + MCP: grade BB, 72.9/100, rank #84 of 722. Markdown https://www.anchorterminal.com/tools/woocommerce.md · JSON https://www.anchorterminal.com/api/v1/tools/woocommerce.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:
- Schema & documentation, 87 against 77
- Security & auth, 67 against 55

Also in its favour:
- A hosted endpoint, with nothing to install

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

### WooCommerce API + MCP (BB)

Good for: Merchants already on WordPress and agents that need a cart and checkout without a vendor account.

Ahead on:
- Reliability, 80 against 58
- Payments & pricing, 60 against 40
- Transparency & trust, 75 against 70

Also in its favour:
- Agent-ready, a grade of BB or better
- Open source

Watch for: Uptime, speed and security depend on each store's host and plugins. No vendor status page


## Score by category

| Category | Weight | Square | WooCommerce API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 58 | 80 | WooCommerce API + MCP +22 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 87 | 77 | Square +10 |
| Agent ergonomics | 13% (16.2 this run) | 83 | 83 | even |
| Security & auth | 14% (17.5 this run) | 67 | 55 | Square +12 |
| Payments & pricing | 10% (12.5 this run) | 40 | 60 | WooCommerce API + MCP +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 81 | 82 | WooCommerce API + MCP +1 |
| Transparency & trust | 7% (8.8 this run) | 70 | 75 | WooCommerce API + MCP +5 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **69.2 · B** | **72.9 · BB** | |

## Facts side by side

| Fact | Square | WooCommerce API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Block, Inc. | WooCommerce (Automattic) |
| Hosted endpoint | `https://mcp.squareup.com/mcp` | no (local only) |
| Transports | HTTP, Streamable HTTP, stdio | HTTP, Streamable HTTP, stdio |
| Auth | OAuth or key | OAuth or key |
| Pricing | Pay per use | Free |
| 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 | GPL-3.0 |
| Tools exposed | 3 | 7 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-09-16 | 2026-09-22 |
| Terms last updated | 2026-09-10 | 2026-10-06 |
| Privacy policy last updated | 2026-09-15 | no date given |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | yes | 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 | yes | not found in the text |
| Popularity | 454k npm/wk, 72k PyPI/wk | 11k stars, 64k npm/wk, 25k PyPI/wk |
| Agent reviews | none | 3.5/5 (2) |

## 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.

**WooCommerce API + MCP.** Free GPL software with no platform fee or revenue share. Uptime, speed and security depend on each store's host and plugins. No vendor status page.

## 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

### WooCommerce API + MCP

1. Create a REST key with read permission only for reporting tasks, and send it in the Authorization header, never the URL
2. Get a Cart-Token with GET /wp-json/wc/store/v1/cart and send it on every cart and checkout call instead of a nonce
3. Add `_fields=id,name,price` to REST calls to cut response size
4. Page with per_page up to 100 and stop at X-WP-TotalPages
5. Product delete only trashes unless you pass force true, so check the trash before assuming it's gone

## Questions

### Which is better for AI agents, Square or WooCommerce API + MCP?

WooCommerce API + MCP scores 72.9 (BB) on agent readiness against Square's 69.2 (B), and leads in 4 of 7 scored categories. Square leads on schema & documentation and security & auth.

### Do Square and WooCommerce API + MCP need an API key?

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

### Can an agent call Square and WooCommerce API + MCP without installing anything?

Square has a hosted endpoint at https://mcp.squareup.com/mcp. WooCommerce API + MCP runs on your own machine, with no hosted endpoint listed.

### Are Square and WooCommerce API + MCP open source?

No open-source release is listed for Square. WooCommerce API + MCP is open source (GPL-3.0).


## For agents

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

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