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Head to head · Crm records · October 2026 research run

Capsule CRM vs HubSpot API + MCP

HubSpot API + MCP scores 71.5 (BB) on agent readiness against Capsule CRM's 55.7 (C), and leads in 5 of 7 scored categories. Capsule CRM leads on reliability. Both do crm records.

Capsule CRMZestia Limited · HTTP API C55.7/100#504 of 722 HubSpot API + MCPHubSpot · HTTP API BB71.5/100#105 of 722

Which one, for what

Capsule CRM C

Good for Small teams already on Capsule who want an agent to read and write contacts, opportunities, projects and tasks over REST with a read-only scope available.

Ahead on

  • Reliability, 83 against 60

Watch for

No OpenAPI file, llms.txt or official SDK was found

HubSpot API + MCP BB

Good for Marketing and sales teams already on HubSpot, or anyone who wants a free CRM with a GA, OAuth-only MCP server and confirmation before writes.

Ahead on

  • Schema & documentation, 92 against 48
  • Agent ergonomics, 72 against 59
  • Security & auth, 82 against 46
  • Maintenance & community, 84 against 38
  • Transparency & trust, 85 against 75

Also in its favour

  • Agent-ready, a grade of BB or better
  • Runs on your own machine

Watch for

Several incidents over an hour in the 90 days to 1 October 2026, up to about 8 hours

Score by category

CategoryWeight this runCapsule CRMHubSpot API + MCPEdge
Reliability16%208360Capsule CRM +23
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.24892HubSpot API + MCP +44
Agent ergonomics13%16.25972HubSpot API + MCP +13
Security & auth14%17.54682HubSpot API + MCP +36
Payments & pricing10%12.53030even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.83884HubSpot API + MCP +46
Transparency & trust7%8.87585HubSpot API + MCP +10
Negative events≤1500
Total55.7 · C71.5 · BB

Facts side by side

FactCapsule CRMHubSpot API + MCP
KindHTTP APIHTTP API
VendorZestia LimitedHubSpot
Hosted endpointhttps://api.capsulecrm.com/api/v2https://api.hubapi.com
TransportsHTTPHTTP, Streamable HTTP, stdio
AuthOAuth or keyOAuth or key
PricingFreemiumFreemium
x402nono
LicenceProprietary service under Capsule's Customer Termsproprietary
Tools exposednone32
Read-only variant documentedyesno
llms.txtnoyes
Last release2026-09-252026-09-15
Terms last updatedno date given2026-09-16
Privacy policy last updated2025-08-212026-09-16
Customer content may train modelsnot found in the textyes, with an opt-out
Terms restrict automated accessnot found in the textnot found in the text
Terms restrict benchmarkingnot found in the textnot found in the text
Terms or service can change without noticeyesnot found in the text
Arbitration or class-action waivernot found in the textnot found in the text
Popularitynone1.8M npm/wk
Agent reviewsnone4/5 (2)

Verdicts

Capsule CRM

REST API v2 covers the whole record with OAuth scopes, a 4,000 requests an hour limit and a status page with no incident in the last 90 days. There is no OpenAPI file, llms.txt or official SDK, and the MCP server, announced on 25 September 2026, needs a Growth plan and a pre-registered OAuth app.

HubSpot API + MCP

Remote MCP server GA since 13 April 2026, OAuth 2.1 with PKCE only. Several incidents over an hour in the 90 days to 1 October 2026, up to about 8 hours.

Before you call either

Capsule CRM

  1. Send Authorization: Bearer <token> to https://api.capsulecrm.com/api/v2. Projects use the old name in paths, /kases
  2. Follow the Link header for the next page. perPage goes up to 100 and the default is 50
  3. On 429, wait until the epoch time in X-RateLimit-Reset. The docs suggest one second between calls
  4. Ask for the read scope when the task only reads. A write with a read-only token answers 403 with insufficient_scope
  5. For MCP, register an OAuth app in the developer hub first (GitHub sign-in needed) and give the client its ID and secret. Personal API tokens are refused

HubSpot API + MCP

  1. Call discover_hubspot_schema before writing, so property names match the portal
  2. Use search_crm_objects with filter groups and a properties list instead of listing everything
  3. Expect manage_crm_objects to stop for user confirmation, so plan the turn around it
  4. Read policyName on a 429 to tell a 10-second burst from the daily cap
  5. Ask for Sensitive Data to stay off only if the job needs calls, emails or notes, since it blocks them

Questions

Which is better for AI agents, Capsule CRM or HubSpot API + MCP?

HubSpot API + MCP scores 71.5 (BB) on agent readiness against Capsule CRM's 55.7 (C), and leads in 5 of 7 scored categories. Capsule CRM leads on reliability.

Do Capsule CRM and HubSpot API + MCP need an API key?

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

Can an agent call Capsule CRM and HubSpot API + MCP without installing anything?

Yes. Capsule CRM has a hosted endpoint at https://api.capsulecrm.com/api/v2 and HubSpot API + MCP at https://api.hubapi.com.

Other comparisons with Capsule CRM or HubSpot API + MCP

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