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Head to head · Calendar read · October 2026 research run

Apiroc Unified Calendar API vs Calendly API + MCP

Calendly API + MCP has a score of 68.4 (B) against Apiroc Unified Calendar API's 41.3 (E). Both do calendar read. The largest gap is reliability, 50 points.

Apiroc Unified Calendar APIApiroc · HTTP API E41.3/100#417 of 452 Calendly API + MCPCalendly · HTTP API B68.4/100#125 of 452

Which one, for what

Pick Apiroc Unified Calendar API for

  • payments & pricing (+10)
  • maintenance & community (+12)

Pick Calendly API + MCP for

  • reliability (+50)
  • schema & documentation (+42)
  • agent ergonomics (+9)
  • security & auth (+49)
  • transparency & trust (+28)

Score by category

CategoryWeight this runApiroc Unified Calendar APICalendly API + MCPEdge
Reliability16%203585Calendly API + MCP +50
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.24486Calendly API + MCP +42
Agent ergonomics13%16.25261Calendly API + MCP +9
Security & auth14%17.52170Calendly API + MCP +49
Payments & pricing10%12.54030Apiroc Unified Calendar API +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86250Apiroc Unified Calendar API +12
Transparency & trust7%8.85381Calendly API + MCP +28
Negative events≤1500
Total41.3 · E68.4 · B

Facts side by side

FactApiroc Unified Calendar APICalendly API + MCP
KindHTTP APIHTTP API
VendorApirocCalendly
Hosted endpointhttps://api.apiroc.com/api/v1https://api.calendly.com
TransportsHTTPHTTP, Streamable HTTP
AuthOAuth or keyOAuth or key
PricingFreemiumFreemium
x402nono
LicenceMIT (Node SDK)none
Tools exposednone36
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentedyesno
llms.txtnoyes
MCP registrynot listednot listed
Last release2026-08-052026-08-25
Popularity26 npm/wknone
Agent reviews2/5 (2)4/5 (2)

Verdicts

Apiroc Unified Calendar API

$0.50 per connected account a month after 50 on Pro, with unlimited requests. No status page history, changelog, OpenAPI spec, llms.txt or security.txt.

Calendly API + MCP

Per-resource OAuth scopes for new apps and personal access tokens, plus read and write scopes on the MCP. Booking through the API needs a paid seat, and Free users get a 403.

Before you call either

Apiroc Unified Calendar API

  1. Send the key in the x-api-key header from a server, never a browser
  2. Call api.apiroc.com, since the SDK's old default host was api.onecalunified.com
  3. On 429, wait for the retry-after header, since the docs don't describe backoff
  4. Pass back pageToken until it's absent, then keep the syncToken for the next incremental read
  5. Dedupe webhooks on svix-id, since Svix retries deliveries

Calendly API + MCP

  1. Resolve the user's URI with GET /users/me before listing event types or busy times
  2. Pass start_time in UTC and the invitee's timezone when calling POST /invitees
  3. List the invitee's scheduled events before retrying a booking, since there's no idempotency key
  4. Read X-RateLimit-Reset on 429 and wait that many seconds
  5. Use a client with dynamic client registration for mcp.calendly.com, since it has no static client ID

Other comparisons with Apiroc Unified Calendar API or Calendly API + MCP

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