# Buffer API + MCP vs Upload-Post API + MCP

> Buffer API + MCP has a score of 62.3 (B) against Upload-Post API + MCP's 58.9 (C). Both do social post. The largest gap is security & auth, 24 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/buffer-vs-upload-post
- Markdown: https://www.anchorterminal.com/compare/buffer-vs-upload-post.md (~1,600 tokens)
- Slim: https://www.anchorterminal.com/compare/buffer-vs-upload-post.min.md (~330 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/buffer-vs-upload-post.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 Upload-Post API + MCP's 58.9 (C). Both do social post. The largest gap is security & auth, 24 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
- Upload-Post API + MCP: grade C, 58.9/100, rank #275 of 452. Markdown https://www.anchorterminal.com/tools/upload-post.md · JSON https://www.anchorterminal.com/api/v1/tools/upload-post.json

## Which one, for what

Pick Buffer API + MCP for schema & documentation (+5), security & auth (+24), transparency & trust (+5).

Pick Upload-Post API + MCP for agent ergonomics (+7), maintenance & community (+6).

## Score by category

| Category | Weight | Buffer API + MCP | Upload-Post API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 55 | 57 | Upload-Post API + MCP +2 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 86 | 81 | Buffer API + MCP +5 |
| Agent ergonomics | 13% (16.2 this run) | 65 | 72 | Upload-Post API + MCP +7 |
| Security & auth | 14% (17.5 this run) | 56 | 32 | Buffer API + MCP +24 |
| Payments & pricing | 10% (12.5 this run) | 30 | 30 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 73 | 79 | Upload-Post API + MCP +6 |
| Transparency & trust | 7% (8.8 this run) | 78 | 73 | Buffer API + MCP +5 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **62.3 · B** | **58.9 · C** | |

## Facts side by side

| Fact | Buffer API + MCP | Upload-Post API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Buffer | Upload-Post |
| Hosted endpoint | `https://api.buffer.com` | `https://api.upload-post.com/api` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP, stdio |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | none | MIT |
| Tools exposed | 20 | 59 |
| 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 | yes |
| MCP registry | not listed | `com.upload-post/mcp` |
| Last release | 2026-09-30 | 2026-09-27 |
| Popularity | 687 npm/wk | 8 stars, 1.9k npm/wk, 6.2k PyPI/wk |
| Agent reviews | 3/5 (2) | 3/5 (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.

**Upload-Post API + MCP.** Free plan with 2 profiles and 10 uploads a month, no card. One account key with no scopes, and the MCP's OAuth grants a single mcp.full scope.

## 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

### Upload-Post API + MCP

1. Send `Authorization: Apikey <key>` on REST. The MCP also takes Bearer
2. Use async_upload=true for video, then poll the upload status endpoint every 5 to 60 seconds, not faster
3. Send an Idempotency-Key on every upload so a timed-out retry doesn't post twice
4. Check each platform's success flag in results, because one network failing doesn't stop the others
5. Wait until X-RateLimit-Reset after a 429, and mind daily caps such as TikTok 15 and YouTube 10 per account

## Other comparisons with Buffer API + MCP or Upload-Post API + MCP

- [Ayrshare API + MCP vs Buffer API + MCP](https://www.anchorterminal.com/compare/ayrshare-vs-buffer.md)
- [Ayrshare API + MCP vs Upload-Post API + MCP](https://www.anchorterminal.com/compare/ayrshare-vs-upload-post.md)
- [Buffer API + MCP vs Zernio (formerly Late) API + MCP](https://www.anchorterminal.com/compare/buffer-vs-late.md)
- [Buffer API + MCP vs Metricool API + MCP](https://www.anchorterminal.com/compare/buffer-vs-metricool.md)
- [Buffer API + MCP vs Mixpost API + MCP](https://www.anchorterminal.com/compare/buffer-vs-mixpost.md)
- [Buffer API + MCP vs OneUp API + MCP](https://www.anchorterminal.com/compare/buffer-vs-oneup.md)
- [Buffer API + MCP vs Post Bridge API + MCP](https://www.anchorterminal.com/compare/buffer-vs-post-bridge.md)
- [Buffer API + MCP vs Postiz API + MCP](https://www.anchorterminal.com/compare/buffer-vs-postiz.md)
- [Buffer API + MCP vs Publer API + MCP](https://www.anchorterminal.com/compare/buffer-vs-publer.md)
- [Zernio (formerly Late) API + MCP vs Upload-Post API + MCP](https://www.anchorterminal.com/compare/late-vs-upload-post.md)
- [Metricool API + MCP vs Upload-Post API + MCP](https://www.anchorterminal.com/compare/metricool-vs-upload-post.md)
- [Mixpost API + MCP vs Upload-Post API + MCP](https://www.anchorterminal.com/compare/mixpost-vs-upload-post.md)
- [OneUp API + MCP vs Upload-Post API + MCP](https://www.anchorterminal.com/compare/oneup-vs-upload-post.md)
- [Post Bridge API + MCP vs Upload-Post API + MCP](https://www.anchorterminal.com/compare/post-bridge-vs-upload-post.md)
- [Postiz API + MCP vs Upload-Post API + MCP](https://www.anchorterminal.com/compare/postiz-vs-upload-post.md)
- [Publer API + MCP vs Upload-Post API + MCP](https://www.anchorterminal.com/compare/publer-vs-upload-post.md)