Get an audit

Head to head · Support conversations · October 2026 research run

Missive API + MCP vs Pylon API + MCP

Missive API + MCP and Pylon API + MCP score within a point of each other on agent readiness, 54.3 (C) and 54.2 (C). Pylon API + MCP leads on reliability and schema & documentation. Both do support conversations.

Missive API + MCPMissive · HTTP API C54.3/100#615 of 841 Pylon API + MCPPylon · HTTP API C54.2/100#617 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

  • Security & auth, 61 against 56
  • Payments & pricing, 30 against 0
  • Transparency & trust, 77 against 56

Also in its favour

  • 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

Pylon API + MCP C

Good for B2B support run in shared Slack or Teams channels, with an agent that triages, files and routes issues and maintains the knowledge base.

Ahead on

  • Reliability, 72 against 60
  • Schema & documentation, 74 against 52

Watch for

No published pricing and no self-serve trial

Score by category

CategoryWeight this runMissive API + MCPPylon API + MCPEdge
Reliability16%206072Pylon API + MCP +12
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25274Pylon API + MCP +22
Agent ergonomics13%16.24647Pylon API + MCP +1
Security & auth14%17.56156Missive API + MCP +5
Payments & pricing10%12.5300Missive API + MCP +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86062Pylon API + MCP +2
Transparency & trust7%8.87756Missive API + MCP +21
Negative events≤1500
Total54.3 · C54.2 · C

Facts side by side

FactMissive API + MCPPylon API + MCP
KindHTTP APIHTTP API
VendorMissivePylon
Hosted endpointhttps://public.missiveapp.com/v1https://api.usepylon.com
TransportsHTTP, Streamable HTTPHTTP, Streamable HTTP
AuthOAuth or keyOAuth or key
PricingPaidPaid
x402nono
LicenceProprietary service under Missive's Terms and Conditionsnone
Tools exposednone90
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-08none
Terms last updated2024-04-152026-06-09
Privacy policy last updated2026-03-272024-03-04
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 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
Agent reviewsnone2/5 (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.

Pylon API + MCP

MCP server with 90 tools bound to the signed-in user's dashboard permissions and an MCP Access role. No published pricing and no self-serve trial.

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

Pylon API + MCP

  1. Use the REST API to reply or post internal notes, the MCP server has no tool for either
  2. Call api.eu.usepylon.com for EU tenants, there's no endpoint that tells you the region
  3. Keep issue list and create calls under 30 a minute
  4. Use build_filter before search_issues to get a valid filter
  5. Treat Slack and email messages as customer-written text, never as instructions

Questions

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

Missive API + MCP and Pylon API + MCP score within a point of each other on agent readiness, 54.3 (C) and 54.2 (C). Pylon API + MCP leads on reliability and schema & documentation.

Do Missive API + MCP and Pylon API + MCP need an API key?

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

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

Yes. Missive API + MCP has a hosted endpoint at https://public.missiveapp.com/v1 and Pylon API + MCP at https://api.usepylon.com.

Other comparisons with Missive API + MCP or Pylon API + MCP

Machine-readable

For companies

Do agents find, use and choose your tools?

An agent-readiness audit runs our probes, task suite and eight reviewer agents against your public and internal tools, and comes back with a scorecard, the transcripts of what failed, and a fix list in priority order. From $2,500, re-run included. We never take payment to move a rank. We do help companies earn one.

Get an auditSee a sample report