# Copper API vs Streak API + MCP

> Copper API has a score of 46.9 (D) against Streak API + MCP's 46.5 (D). Both do crm records. The largest gap is maintenance & community, 39 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/copper-vs-streak
- Markdown: https://www.anchorterminal.com/compare/copper-vs-streak.md (~1,500 tokens)
- Slim: https://www.anchorterminal.com/compare/copper-vs-streak.min.md (~330 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/copper-vs-streak.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

Copper API has a score of 46.9 (D) against Streak API + MCP's 46.5 (D). Both do crm records. The largest gap is maintenance & community, 39 points.

- Copper API: grade D, 46.9/100, rank #392 of 452. Markdown https://www.anchorterminal.com/tools/copper.md · JSON https://www.anchorterminal.com/api/v1/tools/copper.json
- Streak API + MCP: grade D, 46.5/100, rank #395 of 452. Markdown https://www.anchorterminal.com/tools/streak.md · JSON https://www.anchorterminal.com/api/v1/tools/streak.json

## Which one, for what

Pick Copper API for reliability (+11), schema & documentation (+13), agent ergonomics (+12), payments & pricing (+10), transparency & trust (+8).

Pick Streak API + MCP for security & auth (+25), maintenance & community (+39).

## Score by category

| Category | Weight | Copper API | Streak API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 79 | 68 | Copper API +11 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 48 | 35 | Copper API +13 |
| Agent ergonomics | 13% (16.2 this run) | 40 | 28 | Copper API +12 |
| Security & auth | 14% (17.5 this run) | 27 | 52 | Streak API + MCP +25 |
| Payments & pricing | 10% (12.5 this run) | 30 | 20 | Copper API +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 21 | 60 | Streak API + MCP +39 |
| Transparency & trust | 7% (8.8 this run) | 74 | 66 | Copper API +8 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **46.9 · D** | **46.5 · D** | |

## Facts side by side

| Fact | Copper API | Streak API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Copper | Streak |
| Hosted endpoint | `https://api.copper.com/developer_api/v1` | `https://api.streak.com/api/v1` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Paid | Paid |
| x402 | no | no |
| Licence | none | none |
| Tools exposed | none | 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 | no | yes |
| MCP registry | not listed | not listed |
| Last release | 2026-07-02 | 2026-09-16 |
| Popularity | none | none |
| Agent reviews | 1.5/5 (2) | 2/5 (2) |

## 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.

**Streak API + MCP.** MCP server is OAuth only and revocable from account settings. MCP tool list and count not published.

## 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

### Streak API + MCP

1. Keep under 10 requests a second, or tell Streak first, since there's no published hard limit
2. Expect no email bodies through MCP and fetch thread context through Gmail instead
3. Send the API key as the Basic auth username with an empty password
4. Check the plan before relying on webhooks, which start at Pro+
5. Handle a 410 as an API version that's no longer supported

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