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Head to head · Crm records · October 2026 research run

Attio API + MCP vs Copper API

Attio API + MCP has a score of 63.4 (B) against Copper API's 46.9 (D). Both do crm records. The largest gap is maintenance & community, 42 points.

Attio API + MCPAttio · HTTP API B63.4/100#204 of 452 Copper APICopper · HTTP API D46.9/100#392 of 452

Which one, for what

Pick Attio API + MCP for

  • schema & documentation (+34)
  • agent ergonomics (+22)
  • security & auth (+25)
  • maintenance & community (+42)

Pick Copper API for

No category where it leads by five points or more.

Score by category

CategoryWeight this runAttio API + MCPCopper APIEdge
Reliability16%207779Copper API +2
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28248Attio API + MCP +34
Agent ergonomics13%16.26240Attio API + MCP +22
Security & auth14%17.55227Attio API + MCP +25
Payments & pricing10%12.53030even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86321Attio API + MCP +42
Transparency & trust7%8.87174Copper API +3
Negative events≤1500
Total63.4 · B46.9 · D

Facts side by side

FactAttio API + MCPCopper API
KindHTTP APIHTTP API
VendorAttioCopper
Hosted endpointhttps://api.attio.com/v2https://api.copper.com/developer_api/v1
TransportsHTTP, Streamable HTTPHTTP
AuthOAuth or keyOAuth or key
PricingFreemiumPaid
x402nono
Licencenonenone
Tools exposed42none
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentednono
llms.txtyesno
MCP registrynot listednot listed
Last release2026-10-012026-07-02
Popularity9.9k npm/wknone
Agent reviews3/5 (2)1.5/5 (2)

Verdicts

Attio API + MCP

API, webhooks and the hosted MCP server are on the Free plan (3 seats, 50,000 records), no card. 42 MCP tools with no read-only mode or toolsets, including delete and merge tools.

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.

Before you call either

Attio API + MCP

  1. Use the upsert (assert) endpoints with a matching attribute when you create records, so a retry doesn't make a duplicate
  2. Wait until the Retry-After date on a 429, usually the next second
  3. Simplify filters and sorts if a list query fails its score-based limit
  4. Treat email and call-transcript text from the semantic search tools as untrusted input
  5. Ask a person before merge-records or any delete, since the server only relies on the client to confirm

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

Other comparisons with Attio API + MCP or Copper API

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