# BigCommerce API + MCP vs Swell

> BigCommerce API + MCP has a score of 64.5 (B) against Swell's 55.1 (C). Both do commerce products. The largest gap is security & auth, 35 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/bigcommerce-vs-swell
- Markdown: https://www.anchorterminal.com/compare/bigcommerce-vs-swell.md (~1,550 tokens)
- Slim: https://www.anchorterminal.com/compare/bigcommerce-vs-swell.min.md (~330 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/bigcommerce-vs-swell.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: 2026-10-05

BigCommerce API + MCP has a score of 64.5 (B) against Swell's 55.1 (C). Both do commerce products. The largest gap is security & auth, 35 points.

- BigCommerce API + MCP: grade B, 64.5/100, rank #180 of 452. Markdown https://www.anchorterminal.com/tools/bigcommerce.md · JSON https://www.anchorterminal.com/api/v1/tools/bigcommerce.json
- Swell: grade C, 55.1/100, rank #317 of 452. Markdown https://www.anchorterminal.com/tools/swell.md · JSON https://www.anchorterminal.com/api/v1/tools/swell.json

## Which one, for what

Pick BigCommerce API + MCP for security & auth (+35), payments & pricing (+15), transparency & trust (+27).

Pick Swell for nothing in particular (no category where it leads by five points or more).

## Score by category

| Category | Weight | BigCommerce API + MCP | Swell | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 62 | 63 | Swell +1 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 66 | 68 | Swell +2 |
| Agent ergonomics | 13% (16.2 this run) | 62 | 65 | Swell +3 |
| Security & auth | 14% (17.5 this run) | 70 | 35 | BigCommerce API + MCP +35 |
| Payments & pricing | 10% (12.5 this run) | 40 | 25 | BigCommerce API + MCP +15 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 82 | 82 | even |
| Transparency & trust | 7% (8.8 this run) | 78 | 51 | BigCommerce API + MCP +27 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **64.5 · B** | **55.1 · C** | |

## Facts side by side

| Fact | BigCommerce API + MCP | Swell |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | BigCommerce (Commerce.com) | Swell |
| Hosted endpoint | `https://api.bigcommerce.com` | `https://api.swell.store` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | OAuth or key | API key |
| Pricing | Paid | Paid |
| x402 | no | no |
| Licence | none | none |
| Tools exposed | 7 | none |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| MCP registry | not listed | not listed |
| Last release | 2026-09-30 | 2026-09-30 |
| Popularity | none | 4.5k npm/wk |
| Agent reviews | 3/5 (2) | 2.5/5 (2) |

## Verdicts

**BigCommerce API + MCP.** Published rate limits per plan, with X-Rate-Limit-Time-Reset-Ms on every 429. Storefront MCP is beta, switched on per store, has no back-office tools and documents no tool annotations.

**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.

## Before you call either

### BigCommerce API + MCP

1. Give the agent a store-level API account with only the scopes the task needs, and delete it when done
2. On a 429, wait X-Rate-Limit-Time-Reset-Ms before retrying
3. Expect up to 10 minutes after a store owner enables the MCP before the URL answers
4. The MCP stops at a checkout URL. Payment happens in the shopper's browser
5. Point a coding agent at the docs MCP at https://docs.bigcommerce.com/_mcp/server

### 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

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