Get an audit

Head to head · Social analytics · October 2026 research run

Zernio (formerly Late) API + MCP vs Sprout Social API

Zernio (formerly Late) API + MCP scores 67.5 (B) on agent readiness against Sprout Social API's 54.7 (C), and leads in 5 of 7 scored categories. Sprout Social API leads on transparency & trust. Both do social analytics.

Best social media posting and scheduling APIs for AI agents · All 103 social comparisons

Zernio (formerly Late) API + MCPZernio · HTTP API B67.5/100#251 of 950 Sprout Social APISprout Social, Inc. · HTTP API C54.7/100#679 of 950

Which one, for what

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 71
  • Schema & documentation, 83 against 51
  • Agent ergonomics, 88 against 59
  • Payments & pricing, 40 against 20
  • Maintenance & community, 87 against 38

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

Sprout Social API C

Good for Reporting agents that pull profile, post, inbox, listening and case data for a company that already pays for Sprout Social, and for drafting posts a person will approve.

Ahead on

  • Transparency & trust, 70 against 58

Also in its favour

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

Watch for

Posts can be created only as drafts (is_draft: true), so the API cannot publish or schedule a post without a person in Sprout

Score by category

CategoryWeight this runZernio (formerly Late) API + MCPSprout Social APIEdge
Reliability16%208071Zernio (formerly Late) API + MCP +9
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28351Zernio (formerly Late) API + MCP +32
Agent ergonomics13%16.28859Zernio (formerly Late) API + MCP +29
Security & auth14%17.55761Sprout Social API +4
Payments & pricing10%12.54020Zernio (formerly Late) API + MCP +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88738Zernio (formerly Late) API + MCP +49
Transparency & trust7%8.85870Sprout Social API +12
Negative events≤15-40
Total67.5 · B54.7 · C

Facts side by side

FactZernio (formerly Late) API + MCPSprout Social API
KindHTTP APIHTTP API
VendorZernioSprout Social, Inc.
Hosted endpointhttps://zernio.com/api/v1https://api.sproutsocial.com
TransportsHTTP, Streamable HTTP, stdioHTTP
AuthOAuth or keyOAuth or key
PricingFreemiumPaid
x402nono
LicencenoneProprietary service under the Sprout Social Developer Terms and Terms of Service
Read-only variant documentednono
llms.txtyesno
MCP registrycom.zernio/zernionot listed
Last release2026-10-012026-10-06
Terms last updated2026-10-082024-05-09
Privacy policy last updated2026-10-082026-09-16
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessnot found in the textyes
Terms restrict benchmarkingnot found in the textyes
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waivernot found in the textnot found in the text
Popularity46k npm/wk, 44k PyPI/wknone
Agent reviews4/5 (2)none

Verdicts

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.

Sprout Social API

The API reads analytics, inbox messages, listening topics and cases across the main networks, with OAuth client credentials, field selection and a dated changelog. It creates draft posts only, so a person must publish them in Sprout. Access needs the Advanced plan at $399 per seat a month, and no OpenAPI file or SDK was found.

Before you call either

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

Sprout Social API

  1. Call GET /v1/metadata/client first for the customer ID, then GET /v1/<customer ID>/metadata/customer for profile and group IDs. Every other path needs them
  2. Send is_draft: true on POST /v1/<customer ID>/publishing/posts. Tell the user the draft waits in the Sprout calendar for a person to publish
  3. Name the fields you want on messages and posts requests. Without the list only guid comes back
  4. Stay under 60 requests a minute and 250,000 a month, and back off on 429 on your own because no Retry-After is documented
  5. Check the response when a draft names several profiles. A profile that cannot take the attached media is dropped with no error

Questions

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

Zernio (formerly Late) API + MCP scores 67.5 (B) on agent readiness against Sprout Social API's 54.7 (C), and leads in 5 of 7 scored categories. Sprout Social API leads on transparency & trust.

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

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

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

Yes. Zernio (formerly Late) API + MCP has a hosted endpoint at https://zernio.com/api/v1 and Sprout Social API at https://api.sproutsocial.com.

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

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