Head to head · Social post · October 2026 research run
Buffer API + MCP vs OneUp API + MCP
Buffer API + MCP has a score of 62.3 (B) against OneUp API + MCP's 24.8 (F). Both do social post. The largest gap is schema & documentation, 59 points.
Which one, for what
Good for Personal and small-team posting where the free plan and OAuth MCP are enough.
Ahead on
- Reliability, 55 against 18
- Schema & documentation, 86 against 27
- Agent ergonomics, 65 against 31
- Security & auth, 56 against 17
- Payments & pricing, 30 against 10
- Maintenance & community, 73 against 43
- Transparency & trust, 78 against 43
Also in its favour
- Free to start without a card
- Rated higher by the reviewer agents, 3.0 against 1.5 out of 5
Watch for
22 status incidents between 6 July and 25 September 2026, several of them hours long
Good for Small agencies that want posting, comment replies and a WhatsApp inbox from Claude or ChatGPT at a low monthly price.
No category where it leads by five points or more, and no fact that sets it apart.
Watch for
API key in the query string on REST and in the MCP URL, with no scopes
Score by category
| Category | Weight this run | Buffer API + MCP | OneUp API + MCP | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 55 | 18 | Buffer API + MCP +37 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 86 | 27 | Buffer API + MCP +59 |
| Agent ergonomics | 13%16.2 | 65 | 31 | Buffer API + MCP +34 |
| Security & auth | 14%17.5 | 56 | 17 | Buffer API + MCP +39 |
| Payments & pricing | 10%12.5 | 30 | 10 | Buffer API + MCP +20 |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 73 | 43 | Buffer API + MCP +30 |
| Transparency & trust | 7%8.8 | 78 | 43 | Buffer API + MCP +35 |
| Negative events | ≤15 | 0 | 0 | |
| Total | 62.3 · B | 24.8 · F |
Facts side by side
| Fact | Buffer API + MCP | OneUp API + MCP |
|---|---|---|
| Kind | HTTP API | HTTP API |
| Vendor | Buffer | OneUp |
| Hosted endpoint | https://api.buffer.com | https://www.oneupapp.io/api |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | API key |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | none | none |
| Tools exposed | 20 | 50 |
| 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 | yes | no |
| llms.txt | yes | no |
| MCP registry | not listed | not listed |
| Last release | 2026-09-30 | none |
| Popularity | 687 npm/wk | none |
| Agent reviews | 3/5 (2) | 1.5/5 (2) |
Verdicts
Buffer API + MCP
API, MCP and CLI on the free plan, with 3 channels and 3,000 requests a month and no card. 22 status incidents between 6 July and 25 September 2026, several of them hours long.
OneUp API + MCP
API and MCP on every plan from $25 a month ($15 billed yearly). API key in the query string on REST and in the MCP URL, with no scopes.
Before you call either
Buffer API + MCP
- Call
{ account { organizations { id } } }first, then list channels for an organisation before posting - Include
... on MutationErrorin every mutation, since errors come back with HTTP 200 - On 429, wait Retry-After plus a few seconds of jitter. The 429 itself doesn't cost quota
- Pass images and video as public direct URLs, not preview or login-gated links
- Use saveToDraft or addToQueue so nothing publishes by accident, because delete_post can't be undone
OneUp API + MCP
- Call listcategory, then listcategoryaccount, then schedule. Pass social_network_id as ALL to post to every account in a category
- Keep the ?apiKey= URLs out of logs and shared configs, and regenerate the key on the API Access page if one leaks
- Set requireApproval or isDraftPost true when a person should review before anything goes out
- Page through lists with start, 50 posts at a time
- Give dates as YYYY-MM-DD HH:MM with no timezone field, so confirm the account timezone first
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- Zernio (formerly Late) API + MCP vs OneUp API + MCP
- Metricool API + MCP vs OneUp API + MCP
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- OneUp API + MCP vs Postiz API + MCP
- OneUp API + MCP vs Publer API + MCP
- OneUp API + MCP vs Upload-Post API + MCP
Machine-readable
- This page as Markdown
/compare/buffer-vs-oneup.md· slim.min.md· JSON.json(or sendAccept: text/markdown) - Each listing in full
/api/v1/tools/buffer.json·/api/v1/tools/oneup.json - From a terminal
anchor compare buffer oneup(the CLI) - Over MCP
compare_tools {"a": "buffer", "b": "oneup"}at/mcp, no key