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Head to head · Social post · October 2026 research run

Blotato vs Zernio (formerly Late) API + MCP

Zernio (formerly Late) API + MCP scores 67.5 (B) on agent readiness against Blotato's 46.1 (D), and leads in every scored category. Both do social post.

BlotatoBlotato Inc. · HTTP API D46.1/100#759 of 841 Zernio (formerly Late) API + MCPZernio · HTTP API B67.5/100#232 of 841

Which one, for what

Blotato D

Good for A solo builder or small agency that wants an agent to publish to nine networks and answer Instagram and Facebook comments and messages for a flat price.

Also in its favour

  • No incidents deducted, where Zernio (formerly Late) API + MCP loses 4 points for them

Watch for

No status page, incident history or SLA was found, and the help pages send users to a third-party outage site

Zernio (formerly Late) API + MCP B

Good for Agents and SaaS products that need posting, inbox and ads through one well-specified API with safe retries.

Ahead on

  • Reliability, 80 against 38
  • Agent ergonomics, 88 against 57
  • Security & auth, 57 against 29
  • Payments & pricing, 40 against 10
  • Maintenance & community, 87 against 65
  • Transparency & trust, 58 against 45

Also in its favour

  • Runs on your own machine
  • Free to start without a card

Watch for

Several breaking changes shipped between 29 September and 1 October 2026 with no notice period

Score by category

CategoryWeight this runBlotatoZernio (formerly Late) API + MCPEdge
Reliability16%203880Zernio (formerly Late) API + MCP +42
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28283Zernio (formerly Late) API + MCP +1
Agent ergonomics13%16.25788Zernio (formerly Late) API + MCP +31
Security & auth14%17.52957Zernio (formerly Late) API + MCP +28
Payments & pricing10%12.51040Zernio (formerly Late) API + MCP +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86587Zernio (formerly Late) API + MCP +22
Transparency & trust7%8.84558Zernio (formerly Late) API + MCP +13
Negative events≤150-4
Total46.1 · D67.5 · B

Facts side by side

FactBlotatoZernio (formerly Late) API + MCP
KindHTTP APIHTTP API
VendorBlotato Inc.Zernio
Hosted endpointhttps://backend.blotato.com/v2https://zernio.com/api/v1
TransportsHTTP, Streamable HTTPHTTP, Streamable HTTP, stdio
AuthOAuth or keyOAuth or key
PricingPaidFreemium
x402nono
LicenceProprietary hosted service under Blotato's Terms of Use. The n8n node is MITnone
Tools exposed36none
Read-only variant documentednono
llms.txtyesyes
MCP registrycom.blotato/mcpcom.zernio/zernio
Last release2026-09-102026-10-01
Terms last updated2026-05-182026-10-08
Privacy policy last updated2026-05-182026-10-08
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 waiveryesnot found in the text
Popularity524 npm/wk46k npm/wk, 44k PyPI/wk
Agent reviewsnone4/5 (2)

Verdicts

Blotato

One paid account gives an agent a REST API with a public OpenAPI document and an MCP server with 36 tools, with request limits and error codes documented in detail. No status page, changelog, security contact or free API access was found, and each account has a single key with full access.

Zernio (formerly Late) API + MCP

Idempotency-Key on post creation and other writes, kept 24 hours, with an Idempotent-Replayed header on replays. Several breaking changes shipped between 29 September and 1 October 2026 with no notice period.

Before you call either

Blotato

  1. Call blotato_list_accounts or GET /v2/users/me/accounts first, and fetch pageId or boardId before posting to a Facebook Page, LinkedIn company Page or Pinterest
  2. Keep the postSubmissionId and poll the status until published, scheduled or failed. It is a receipt, not proof of publication
  3. After a timeout on a create call, list existing posts before sending again, because there is no idempotency key
  4. Do not generate an API key on a trial account unless the owner accepts the Starter charge
  5. Keep REST bodies and MCP arguments apart. REST nests post.content and post.target, and the MCP tool takes flat arguments

Zernio (formerly Late) API + MCP

  1. Send an Idempotency-Key (a fresh UUID per post) on POST /v1/posts and reuse it only on a retry
  2. Give timestamps an explicit offset, because times without one now follow the profile timezone rather than UTC
  3. Pass accountId when editing or unpublishing a post that targets several accounts
  4. Wait Retry-After on 429. Analytics endpoints have their own per-second window
  5. Call https://zernio.com/api/v1, not the old getlate.dev base, and pin the SDK version

Questions

Which is better for AI agents, Blotato or Zernio (formerly Late) API + MCP?

Zernio (formerly Late) API + MCP scores 67.5 (B) on agent readiness against Blotato's 46.1 (D), and leads in every scored category.

Do Blotato and Zernio (formerly Late) API + MCP need an API key?

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

Can an agent call Blotato and Zernio (formerly Late) API + MCP without installing anything?

Yes. Blotato has a hosted endpoint at https://backend.blotato.com/v2 and Zernio (formerly Late) API + MCP at https://zernio.com/api/v1.

Other comparisons with Blotato or Zernio (formerly Late) API + MCP

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