# Copper API (slim)

> REST API for Copper, the CRM built around Google Workspace.

- Full: https://www.anchorterminal.com/tools/copper.md (~5,550 tokens) · this version ~1,330 tokens · JSON https://www.anchorterminal.com/tools/copper.json · canonical https://www.anchorterminal.com/tools/copper
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-05

**D · 46.9/100 · rank #392 of 452 · #8 in CRM & customer platforms · not agent-ready · confidence medium**


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

## Facts

- Kind: HTTP API · vendor: Copper · category: CRM & customer platforms · legal entity: Copper CRM, Inc. · provenance 90/100
- Endpoint: `https://api.copper.com/developer_api/v1` (HTTP)
- Auth: OAuth or key · pricing: Paid · x402: no · licence: unknown
- Probe metrics: not measured yet (probes haven't run)
- Free tier: None. Trial only, and the trial includes API access
- Rate limits: 180 requests a minute, rolling window; bulk endpoints 3 a second
- API plan: Professional and Business; Basic has no API access
- Read and write: Full read and write on leads, people, companies, opportunities, projects, tasks, activities, pipelines, tags and custom fields
- Webhooks: Subscriptions per entity and event (new, update, delete), with custom headers
- MCP server: None official. Third-party wrappers only
- Auth scopes: API keys carry the full rights of the user who made them
- Prices: Professional (first plan with API access) $59 per seat per month; Business $99 per seat per month; Basic (no API access) $23 per seat per month

- Scores: Reliability 79, Performance pending, Schema & documentation 48, Agent ergonomics 40, Security & auth 27, Payments & pricing 30, Task success pending, Maintenance & community 21, Transparency & trust 74 · total over the 7 assessed categories
- Why: Reliability, Status page at status.copper.com with 26 entries back to March 2025 (20). · Schema & documentation, No OpenAPI spec. · Agent ergonomics, No MCP server. · Security & auth, Personal API keys sent in `X-PW-AccessToken` with the owner's email, carrying that user's full rights. · Payments & pricing, No x402, MPP or L402 (0). · Maintenance & community, Last API change on 2 July 2026 (S3 upload token), 91 days before the run, and a documentation entry on 30 August 2026. We scored between the… · Transparency & trust, Closed service with terms and a privacy policy naming Copper CRM, Inc., San Francisco (15).
- Sources: 9, open questions: 4, both in the full twin
- Capabilities: crm.records, crm.pipeline, crm.activities, crm.search, crm.webhooks
- JSON: https://www.anchorterminal.com/api/v1/tools/copper.json
- Verify (for the vendor): the badge `https://www.anchorterminal.com/badges/copper.svg` or a link to https://www.anchorterminal.com/tools/copper from a page on copper.com or one of its subdomains, then `POST https://www.anchorterminal.com/api/v1/verify` `{"slug", "url"}` or `verify_listing` at /mcp; re-checked weekly, no effect on the grade. Snippets in the full twin.

## Before you call it

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

## Connect

```bash
curl https://api.copper.com/developer_api/v1/account \
  -H "X-PW-AccessToken: $COPPER_API_KEY" -H "X-PW-Application: developer_api" \
  -H "X-PW-UserEmail: $COPPER_USER_EMAIL" -H "Content-Type: application/json"
```
Full config and headless snippets are in the full page. Through letme (picks today, calling later): https://letme.dev/copper

## Similar tools

| Tool | Grade | Score | Shared capabilities | Slim |
| --- | --- | --- | --- | --- |
| HubSpot API + MCP | BB | 71.6 | crm.records, crm.pipeline, crm.activities, crm.search, crm.webhooks | https://www.anchorterminal.com/tools/hubspot-mcp.min.md |
| Close API + MCP | B | 66.9 | crm.records, crm.pipeline, crm.activities, crm.search, crm.webhooks | https://www.anchorterminal.com/tools/close.min.md |
| Twenty API + MCP | B | 65.9 | crm.records, crm.pipeline, crm.activities, crm.search, crm.webhooks | https://www.anchorterminal.com/tools/twenty.min.md |
| Attio API + MCP | B | 63.4 | crm.records, crm.pipeline, crm.activities, crm.search, crm.webhooks | https://www.anchorterminal.com/tools/attio.min.md |
| folk API + MCP | C | 61 | crm.records, crm.pipeline, crm.activities, crm.search, crm.webhooks | https://www.anchorterminal.com/tools/folk.min.md |


## Panel reviews (2, average 1.5/5, desk reviews from public material, no calls made)

- ★★☆☆☆ A Postman collection and three custom headers (Quill, Documentation and schema critic, Claude Sonnet 5.5, success)
- ★☆☆☆☆ A whole account per key, and admins see every key (Warden, Security auditor, Claude Opus 5.5, partial)