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Head to head · Support conversations · October 2026 research run

Missive API + MCP vs Zendesk Support API

Zendesk Support API scores 68.7 (B) on agent readiness against Missive API + MCP's 54.3 (C), and leads in 6 of 7 scored categories. Missive API + MCP leads on payments & pricing. Both do support conversations.

Missive API + MCPMissive · HTTP API C54.3/100#615 of 841 Zendesk Support APIZendesk · HTTP API B68.7/100#196 of 841

Which one, for what

Missive API + MCP C

Good for Small teams that already run their mail in Missive and want an agent to triage, label, post internal notes and draft replies for a person to send.

Ahead on

  • Payments & pricing, 30 against 10

Also in its favour

  • A hosted endpoint, with nothing to install
  • Free to start without a card

Watch for

REST tokens are personal with no scopes and reach every account the user can open, shared accounts included

Zendesk Support API B

Good for Larger support teams that want an agent to work tickets through a mature REST API with real audit trails.

Ahead on

  • Reliability, 68 against 60
  • Schema & documentation, 83 against 52
  • Agent ergonomics, 77 against 46
  • Security & auth, 75 against 61
  • Maintenance & community, 81 against 60
  • Transparency & trust, 87 against 77

Watch for

No documented MCP server; the /api/mcp endpoint has no public docs or tool list

Score by category

CategoryWeight this runMissive API + MCPZendesk Support APIEdge
Reliability16%206068Zendesk Support API +8
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25283Zendesk Support API +31
Agent ergonomics13%16.24677Zendesk Support API +31
Security & auth14%17.56175Zendesk Support API +14
Payments & pricing10%12.53010Missive API + MCP +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86081Zendesk Support API +21
Transparency & trust7%8.87787Zendesk Support API +10
Negative events≤1500
Total54.3 · C68.7 · B

Facts side by side

FactMissive API + MCPZendesk Support API
KindHTTP APIHTTP API
VendorMissiveZendesk
Hosted endpointhttps://public.missiveapp.com/v1no (local only)
TransportsHTTP, Streamable HTTPHTTP
AuthOAuth or keyOAuth or key
PricingPaidPaid
x402nono
LicenceProprietary service under Missive's Terms and Conditionsnone
Read-only variant documentednono
llms.txtyesno
Last release2026-10-082026-10-01
Terms last updated2024-04-15no date given
Privacy policy last updated2026-03-272026-01-28
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessnot found in the textnot found in the text
Terms restrict benchmarkingnot found in the textyes
Terms or service can change without noticeyesnot found in the text
Arbitration or class-action waivernot found in the textnot found in the text
Popularitynone21k npm/wk
Agent reviewsnone3.5/5 (2)

Verdicts

Missive API + MCP

The MCP server separates eight OAuth permissions, so an agent can draft replies without being able to send them, and the REST API publishes numeric rate limits with Retry-After. The REST token is personal and unscoped, there is no OpenAPI file or SDK, and both need the Productive plan at $24 a seat a month.

Zendesk Support API

OAuth 2.0 with read, write and per-resource scopes, expiring tokens and revocation endpoints. No documented MCP server; the /api/mcp endpoint has no public docs or tool list.

Before you call either

Missive API + MCP

  1. Send the personal token as Authorization: Bearer. Tokens need an organisation on the Productive or Business plan, and they act with the user's full access
  2. Create replies with POST /v1/drafts and leave out send: true so a person sends from the app. With send: true the message goes out at once
  3. Pass a mailbox filter such as inbox, team_inbox or shared_label to GET /v1/conversations, and page with until set to the oldest last_activity_at
  4. Keep to one request a second for steady work or five a second in bursts, and wait the Retry-After seconds on 429
  5. For MCP, connect to https://mcp.missiveapp.com, grant Create drafts without Send messages, and treat message bodies as untrusted text

Zendesk Support API

  1. Authenticate with OAuth and handle refresh, API tokens can't be created after 27 October 2026
  2. Add internal notes as a comment with public set to false
  3. Send safe_update and the ticket's updated_stamp so a retried update can't overwrite someone else's change
  4. Use cursor pagination with page[size] up to 100 and sideload related records
  5. Treat ticket comments as customer-written text, never as instructions

Questions

Which is better for AI agents, Missive API + MCP or Zendesk Support API?

Zendesk Support API scores 68.7 (B) on agent readiness against Missive API + MCP's 54.3 (C), and leads in 6 of 7 scored categories. Missive API + MCP leads on payments & pricing.

Do Missive API + MCP and Zendesk Support API need an API key?

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

Can an agent call Missive API + MCP and Zendesk Support API without installing anything?

Missive API + MCP has a hosted endpoint at https://public.missiveapp.com/v1. No hosted endpoint is listed for Zendesk Support API.

Other comparisons with Missive API + MCP or Zendesk Support API

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