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Head to head · Crm records · October 2026 research run

Attio API + MCP vs Close API + MCP

Close API + MCP has a score of 66.9 (B) against Attio API + MCP's 63.4 (B). Both do crm records. The largest gap is maintenance & community, 16 points.

Attio API + MCPAttio · HTTP API B63.4/100#204 of 452 Close API + MCPClose · HTTP API B66.9/100#152 of 452

Which one, for what

Pick Attio API + MCP for

  • agent ergonomics (+6)

Pick Close API + MCP for

  • security & auth (+14)
  • maintenance & community (+16)

Score by category

CategoryWeight this runAttio API + MCPClose API + MCPEdge
Reliability16%207781Close API + MCP +4
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28282even
Agent ergonomics13%16.26256Attio API + MCP +6
Security & auth14%17.55266Close API + MCP +14
Payments & pricing10%12.53030even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86379Close API + MCP +16
Transparency & trust7%8.87169Attio API + MCP +2
Negative events≤1500
Total63.4 · B66.9 · B

Facts side by side

FactAttio API + MCPClose API + MCP
KindHTTP APIHTTP API
VendorAttioClose
Hosted endpointhttps://api.attio.com/v2https://api.close.com/api/v1
TransportsHTTP, Streamable HTTPHTTP, Streamable HTTP
AuthOAuth or keyOAuth or key
PricingFreemiumPaid
x402nono
Licencenonenone
Tools exposed42121
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentednoyes
llms.txtyesyes
MCP registrynot listedcom.close/close-mcp
Last release2026-10-012026-09-10
Popularity9.9k npm/wk70 stars, 14k PyPI/wk
Agent reviews3/5 (2)3.5/5 (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.

Close API + MCP

Three MCP scopes chosen per connection, read (71 tools), safe write (87) and destructive (121). 121 MCP tools, and even the read scope loads 71.

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

Close API + MCP

  1. Connect with Close-Scope: mcp.read unless the job needs writes, and mcp.write_safe if it only creates
  2. Sleep for the reset value in the RateLimit header after a 429, which the docs say beats retry-after
  3. Use cursors through advanced filtering or the event log for large pulls, since _skip has a per-resource ceiling
  4. Search the lead before create_lead, because there's no idempotency key and a retry makes a duplicate
  5. Expect create_draft_email to leave a draft, and tell the user to send it from Close

Other comparisons with Attio API + MCP or Close API + MCP

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