# 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. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/buffer-vs-oneup
- Markdown: https://www.anchorterminal.com/compare/buffer-vs-oneup.md (~1,850 tokens)
- Slim: https://www.anchorterminal.com/compare/buffer-vs-oneup.min.md (~430 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/buffer-vs-oneup.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

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.

- Buffer API + MCP: grade B, 62.3/100, rank #220 of 452. Markdown https://www.anchorterminal.com/tools/buffer.md · JSON https://www.anchorterminal.com/api/v1/tools/buffer.json
- OneUp API + MCP: grade F, 24.8/100, rank #445 of 452. Markdown https://www.anchorterminal.com/tools/oneup.md · JSON https://www.anchorterminal.com/api/v1/tools/oneup.json

## Which one, for what

### Buffer API + MCP (B)

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

### OneUp API + MCP (F)

Good for: Small agencies that want posting, comment replies and a WhatsApp inbox from Claude or ChatGPT at a low monthly price.

Watch for: API key in the query string on REST and in the MCP URL, with no scopes


## Score by category

| Category | Weight | Buffer API + MCP | OneUp API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 55 | 18 | Buffer API + MCP +37 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 86 | 27 | Buffer API + MCP +59 |
| Agent ergonomics | 13% (16.2 this run) | 65 | 31 | Buffer API + MCP +34 |
| Security & auth | 14% (17.5 this run) | 56 | 17 | Buffer API + MCP +39 |
| Payments & pricing | 10% (12.5 this run) | 30 | 10 | Buffer API + MCP +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 73 | 43 | Buffer API + MCP +30 |
| Transparency & trust | 7% (8.8 this run) | 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

1. Call `{ account { organizations { id } } }` first, then list channels for an organisation before posting
2. Include `... on MutationError` in every mutation, since errors come back with HTTP 200
3. On 429, wait Retry-After plus a few seconds of jitter. The 429 itself doesn't cost quota
4. Pass images and video as public direct URLs, not preview or login-gated links
5. Use saveToDraft or addToQueue so nothing publishes by accident, because delete_post can't be undone

### OneUp API + MCP

1. Call listcategory, then listcategoryaccount, then schedule. Pass social_network_id as ALL to post to every account in a category
2. Keep the ?apiKey= URLs out of logs and shared configs, and regenerate the key on the API Access page if one leaks
3. Set requireApproval or isDraftPost true when a person should review before anything goes out
4. Page through lists with start, 50 posts at a time
5. Give dates as YYYY-MM-DD HH:MM with no timezone field, so confirm the account timezone first

## For agents

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

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