# Copper API vs Nutshell

> Nutshell scores 49.6 (D) on agent readiness against Copper API's 46.7 (D), and leads in 5 of 7 scored categories. Copper API leads on reliability. Both do crm records. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/copper-vs-nutshell
- Markdown: https://www.anchorterminal.com/compare/copper-vs-nutshell.md (~2,250 tokens)
- Slim: https://www.anchorterminal.com/compare/copper-vs-nutshell.min.md (~580 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/copper-vs-nutshell.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

Nutshell scores 49.6 (D) on agent readiness against Copper API's 46.7 (D), and leads in 5 of 7 scored categories. Copper API leads on reliability. Both do crm records.

- Copper API: grade D, 46.7/100, rank #642 of 722. Markdown https://www.anchorterminal.com/tools/copper.md · JSON https://www.anchorterminal.com/api/v1/tools/copper.json
- Nutshell: grade D, 49.6/100, rank #607 of 722. Markdown https://www.anchorterminal.com/tools/nutshell.md · JSON https://www.anchorterminal.com/api/v1/tools/nutshell.json

## Which one, for what

### Copper API (D)

Good for: Teams already on Copper and Google Workspace who want an agent to read and update deals and contacts through REST.

Ahead on:
- Reliability, 79 against 42

Watch for: No official MCP server, OpenAPI spec or llms.txt

### Nutshell (D)

Good for: Small sales teams already on Nutshell who want an agent to read pipeline data over MCP or write records over REST at a low seat price.

Ahead on:
- Schema & documentation, 57 against 48
- Security & auth, 58 against 27
- Payments & pricing, 35 against 30
- Maintenance & community, 46 against 21

Watch for: No rate limit numbers, 429 handling or Retry-After found for the REST API


## Score by category

| Category | Weight | Copper API | Nutshell | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 79 | 42 | Copper API +37 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 48 | 57 | Nutshell +9 |
| Agent ergonomics | 13% (16.2 this run) | 40 | 44 | Nutshell +4 |
| Security & auth | 14% (17.5 this run) | 27 | 58 | Nutshell +31 |
| Payments & pricing | 10% (12.5 this run) | 30 | 35 | Nutshell +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 21 | 46 | Nutshell +25 |
| Transparency & trust | 7% (8.8 this run) | 72 | 71 | Copper API +1 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **46.7 · D** | **49.6 · D** | |

## Facts side by side

| Fact | Copper API | Nutshell |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Copper | Nutshell, Inc. |
| Hosted endpoint | `https://api.copper.com/developer_api/v1` | `https://app.nutshell.com/rest` |
| Transports | HTTP | HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Paid | Paid |
| x402 | no | no |
| Licence | none | Proprietary service under Nutshell's Terms of Service |
| Read-only variant documented | no | yes |
| llms.txt | no | yes |
| Last release | 2026-07-02 | 2026-08-21 |
| Terms last updated | 2025-07-01 | 2026-06-02 |
| Privacy policy last updated | 2026-05-11 | 2026-06-02 |
| 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 | yes |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | yes | yes |
| Agent reviews | 1.5/5 (2) | none |

## Verdicts

**Copper API.** Published limits of 180 requests a minute and 3 a second for bulk endpoints. No official MCP server, OpenAPI spec or llms.txt.

**Nutshell.** The REST reference is served as Markdown with an OpenAPI fragment per operation, and the hosted MCP server uses OAuth with PKCE and can only read. No rate limit numbers, error format or API changelog were found in the reviewed documentation, and API keys carry no scopes.

## Before you call either

### Copper API

1. Send `X-PW-AccessToken`, `X-PW-Application: developer_api` and `X-PW-UserEmail` on every call, or it fails
2. Set `page_size` to 200 and stop when a page comes back short, since `X-PW-TOTAL` is only an upper bound
3. Back off on 429 on your own clock, since no Retry-After is documented
4. Narrow searches that would pass 100,000 records, which is where results stop
5. Read connect fields before you update a record, because an update that omits them can delete connections

### Nutshell

1. Authenticate REST calls with HTTP Basic, a Nutshell user's email as username and the API key as password, against `https://app.nutshell.com/rest`
2. Use IDs in the `<number>-<type>` form, such as `3-accounts`, and send updates as JSON Patch with `content-type: application/json-patch+json`
3. Page lists with `page[limit]` and `page[page]`, which is 0-based, and call `/accounts/list/fields` or the lead and contact equivalents for valid filter keys
4. Use the REST API for writes. The MCP server only reads, and OAuth tokens need the `read` scope
5. Filter webhook events yourself, because every webhook receives all events and subscriptions are created in Setup, not through the API

## Questions

### Which is better for AI agents, Copper API or Nutshell?

Nutshell scores 49.6 (D) on agent readiness against Copper API's 46.7 (D), and leads in 5 of 7 scored categories. Copper API leads on reliability.

### Do Copper API and Nutshell need an API key?

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

### Can an agent call Copper API and Nutshell without installing anything?

Yes. Copper API has a hosted endpoint at https://api.copper.com/developer_api/v1 and Nutshell at https://app.nutshell.com/rest.


## For agents

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

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