# Zernio (formerly Late) API + MCP vs Mixpost API + MCP

> Zernio (formerly Late) API + MCP has a score of 67.5 (B) against Mixpost API + MCP's 49.7 (D). Both do social post. The largest gap is agent ergonomics, 35 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/late-vs-mixpost
- Markdown: https://www.anchorterminal.com/compare/late-vs-mixpost.md (~1,700 tokens)
- Slim: https://www.anchorterminal.com/compare/late-vs-mixpost.min.md (~380 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/late-vs-mixpost.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: 2026-10-05

Zernio (formerly Late) API + MCP has a score of 67.5 (B) against Mixpost API + MCP's 49.7 (D). Both do social post. The largest gap is agent ergonomics, 35 points.

- Zernio (formerly Late) API + MCP: grade B, 67.5/100, rank #139 of 452. Markdown https://www.anchorterminal.com/tools/late.md · JSON https://www.anchorterminal.com/api/v1/tools/late.json
- Mixpost API + MCP: grade D, 49.7/100, rank #368 of 452. Markdown https://www.anchorterminal.com/tools/mixpost.md · JSON https://www.anchorterminal.com/api/v1/tools/mixpost.json

## Which one, for what

Pick Zernio (formerly Late) API + MCP for reliability (+10), schema & documentation (+7), agent ergonomics (+35), security & auth (+14), payments & pricing (+30), maintenance & community (+24), transparency & trust (+8).

Pick Mixpost API + MCP for nothing in particular (no category where it leads by five points or more).

## Score by category

| Category | Weight | Zernio (formerly Late) API + MCP | Mixpost API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 80 | 70 | Zernio (formerly Late) API + MCP +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 83 | 76 | Zernio (formerly Late) API + MCP +7 |
| Agent ergonomics | 13% (16.2 this run) | 88 | 53 | Zernio (formerly Late) API + MCP +35 |
| Security & auth | 14% (17.5 this run) | 57 | 43 | Zernio (formerly Late) API + MCP +14 |
| Payments & pricing | 10% (12.5 this run) | 40 | 10 | Zernio (formerly Late) API + MCP +30 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 87 | 63 | Zernio (formerly Late) API + MCP +24 |
| Transparency & trust | 7% (8.8 this run) | 59 | 51 | Zernio (formerly Late) API + MCP +8 |
| Negative events | ≤15 | -4 | -4 | |
| **Total** | | **67.5 · B** | **49.7 · D** | |

## Facts side by side

| Fact | Zernio (formerly Late) API + MCP | Mixpost API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Zernio | Mixpost (Inovector) |
| Hosted endpoint | `https://zernio.com/api/v1` | no (local only) |
| Transports | HTTP, Streamable HTTP, stdio | HTTP, Streamable HTTP |
| Auth | OAuth or key | Token |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | none | proprietary (Pro and Enterprise, which carry the API and MCP), MIT (Lite) |
| Tools exposed | none | 30 |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| MCP registry | `com.zernio/zernio` | not listed |
| Last release | 2026-10-01 | 2026-09-30 |
| Popularity | 46k npm/wk, 44k PyPI/wk | 3.7k stars |
| Agent reviews | 4/5 (2) | 2/5 (2) |

## 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.

**Mixpost API + MCP.** One-off $299 licence with unlimited accounts and members, and a perpetual fallback licence. No API or MCP in the free Lite edition.

## 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

### Mixpost API + MCP

1. Call list-workspaces first. Workspace endpoints sit under /api/{workspaceUuid}
2. Check MIXPOST_CORE_PATH. It's empty by default from Pro v7 but defaults to mixpost in older versions and Lite
3. Create the token as a Viewer-role user when the agent only needs to read
4. Use unschedule-post rather than delete-post when a person wants a post pulled back to draft
5. Expect HTTP 422 with an errors.limit entry when a Cloud plan limit is hit

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