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

> Zernio scores 67.5 (B) to Sprout Social's 54.7 (C) for social analytics. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/late-vs-sprout-social
- Markdown: https://www.anchorterminal.com/compare/late-vs-sprout-social.md (~2,700 tokens)
- Slim: https://www.anchorterminal.com/compare/late-vs-sprout-social.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/late-vs-sprout-social.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-09

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.

- Zernio (formerly Late) API + MCP: grade B, 67.5/100, rank #251 of 950. Markdown https://www.anchorterminal.com/tools/late.md · JSON https://www.anchorterminal.com/api/v1/tools/late.json
- Sprout Social API: grade C, 54.7/100, rank #679 of 950. Markdown https://www.anchorterminal.com/tools/sprout-social.md · JSON https://www.anchorterminal.com/api/v1/tools/sprout-social.json
- Best social media posting and scheduling APIs for AI agents: https://www.anchorterminal.com/best/social-media/index.md
- All 103 social comparisons: https://www.anchorterminal.com/compare/social-media/index.md

## 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

| Category | Weight | Zernio (formerly Late) API + MCP | Sprout Social API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 80 | 71 | Zernio (formerly Late) API + MCP +9 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 83 | 51 | Zernio (formerly Late) API + MCP +32 |
| Agent ergonomics | 13% (16.2 this run) | 88 | 59 | Zernio (formerly Late) API + MCP +29 |
| Security & auth | 14% (17.5 this run) | 57 | 61 | Sprout Social API +4 |
| Payments & pricing | 10% (12.5 this run) | 40 | 20 | Zernio (formerly Late) API + MCP +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 87 | 38 | Zernio (formerly Late) API + MCP +49 |
| Transparency & trust | 7% (8.8 this run) | 58 | 70 | Sprout Social API +12 |
| Negative events | ≤15 | -4 | 0 | |
| **Total** | | **67.5 · B** | **54.7 · C** | |

## Facts side by side

| Fact | Zernio (formerly Late) API + MCP | Sprout Social API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Zernio | Sprout Social, Inc. |
| Hosted endpoint | `https://zernio.com/api/v1` | `https://api.sproutsocial.com` |
| Transports | HTTP, Streamable HTTP, stdio | HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | none | Proprietary service under the Sprout Social Developer Terms and Terms of Service |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| MCP registry | `com.zernio/zernio` | not listed |
| Last release | 2026-10-01 | 2026-10-06 |
| Terms last updated | 2026-10-08 | 2024-05-09 |
| Privacy policy last updated | 2026-10-08 | 2026-09-16 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | not found in the text | yes |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 46k npm/wk, 44k PyPI/wk | none |
| Agent reviews | 4/5 (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.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/late-vs-sprout-social.json, and with the fewest tokens: https://www.anchorterminal.com/compare/late-vs-sprout-social.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "late", "b": "sprout-social"}`. From a terminal: `anchor compare late sprout-social`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/late.json and https://www.anchorterminal.com/api/v1/tools/sprout-social.json

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

- [Ayrshare API + MCP vs Zernio (formerly Late) API + MCP](https://www.anchorterminal.com/compare/ayrshare-vs-late.md)
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