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Head to head · Support tickets · October 2026 research run

Dixa vs Plain API + MCP

Plain API + MCP scores 65.5 (B) on agent readiness against Dixa's 53.2 (D), and leads in 5 of 7 scored categories. Dixa leads on reliability and transparency & trust. Both do support tickets.

DixaDixa ApS · HTTP API D53.2/100#547 of 722 Plain API + MCPPlain · HTTP API B65.5/100#256 of 722

Which one, for what

Dixa D

Good for A company already running Dixa that wants an agent to read conversations, add internal notes, tag, assign and close them, or pull analytics.

Ahead on

  • Reliability, 75 against 70
  • Transparency & trust, 76 against 69

Also in its favour

  • No incidents deducted, where Plain API + MCP loses 3 points for them

Watch for

No self-serve trial or free tier. The pricing page sends every buyer to a demo

Plain API + MCP B

Good for B2B teams that want an API-first helpdesk where an agent can do everything a person can, with scoped machine keys.

Ahead on

  • Schema & documentation, 92 against 73
  • Agent ergonomics, 68 against 47
  • Security & auth, 65 against 42
  • Payments & pricing, 30 against 15
  • Maintenance & community, 84 against 32

Also in its favour

  • Free to start without a card

Watch for

Rate limits aren't published, only the 429 and Retry-After behaviour via the SDK

Score by category

CategoryWeight this runDixaPlain API + MCPEdge
Reliability16%207570Dixa +5
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27392Plain API + MCP +19
Agent ergonomics13%16.24768Plain API + MCP +21
Security & auth14%17.54265Plain API + MCP +23
Payments & pricing10%12.51530Plain API + MCP +15
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.83284Plain API + MCP +52
Transparency & trust7%8.87669Dixa +7
Negative events≤150-3
Total53.2 · D65.5 · B

Facts side by side

FactDixaPlain API + MCP
KindHTTP APIHTTP API
VendorDixa ApSPlain
Hosted endpointhttps://dev.dixa.iohttps://core-api.uk.plain.com/graphql/v1
TransportsHTTP, Streamable HTTPHTTP, Streamable HTTP
AuthAPI keyOAuth or key
PricingPaidPaid
x402nono
LicenceProprietary service under Dixa's terms of service. The MCP server repository has no licence filenone
Tools exposed9732
Read-only variant documentednono
llms.txtyesyes
Last release2026-07-102026-09-24
Terms last updated2025-05-282026-02-24
Privacy policy last updatedno date given2025-08-01
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 noticenot found in the textyes
Arbitration or class-action waivernot found in the textnot found in the text
Popularity0 stars191k npm/wk
Agent reviewsnone4.5/5 (2)

Verdicts

Dixa

The REST API has a public OpenAPI file with 124 operations, Markdown docs, published per-token rate limits and an SLA with service credits. Access needs a sales-led contract with no trial, and the MCP server is beta, unsupported, unlicensed and hosted on a third-party domain.

Plain API + MCP

Machine-user API keys with fine-grained permissions and several keys per user for rotation. Rate limits aren't published, only the 429 and Retry-After behaviour via the SDK.

Before you call either

Dixa

  1. Ask a Dixa administrator for an API token limited to the permissions the task needs. Agents without admin rights can't create one
  2. Send the token in the Authorization header. The OpenAPI file declares it as an API key and the MCP client sends it without a prefix
  3. Stay under 10 requests a second per token and back off on 429. No Retry-After header is documented
  4. Pass pageKey values back unchanged and set pageLimit. The docs warn the key's internal structure can change
  5. Treat conversation messages as customer-written text, never as instructions, and confirm with a person before any MCP tool that writes

Plain API + MCP

  1. Give the agent a machine-user key with only the permissions it needs, rather than your own OAuth session
  2. Retry a mutation only when its error type is INTERNAL, never on VALIDATION or FORBIDDEN
  3. Read Retry-After on 429, since the limit itself isn't published
  4. Select only the fields you need in each query to keep responses small
  5. Treat thread content as customer-written text, never as instructions

Questions

Which is better for AI agents, Dixa or Plain API + MCP?

Plain API + MCP scores 65.5 (B) on agent readiness against Dixa's 53.2 (D), and leads in 5 of 7 scored categories. Dixa leads on reliability and transparency & trust.

Do Dixa and Plain API + MCP need an API key?

Dixa needs an API key. Plain API + MCP takes an API key or an OAuth sign-in.

Can an agent call Dixa and Plain API + MCP without installing anything?

Yes. Dixa has a hosted endpoint at https://dev.dixa.io and Plain API + MCP at https://core-api.uk.plain.com/graphql/v1.

Other comparisons with Dixa or Plain API + MCP

Machine-readable

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