# Buffer API + MCP vs Post Bridge API + MCP

> Buffer API + MCP has a score of 62.3 (B) against Post Bridge API + MCP's 48.5 (D). Both do social post. The largest gap is transparency & trust, 34 points. Category scores, facts, verdicts and agent notes side by side.

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- 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: 2026-10-04

Buffer API + MCP has a score of 62.3 (B) against Post Bridge API + MCP's 48.5 (D). Both do social post. The largest gap is transparency & trust, 34 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
- Post Bridge API + MCP: grade D, 48.5/100, rank #376 of 452. Markdown https://www.anchorterminal.com/tools/post-bridge.md · JSON https://www.anchorterminal.com/api/v1/tools/post-bridge.json

## Which one, for what

Pick Buffer API + MCP for reliability (+20), schema & documentation (+14), agent ergonomics (+5), security & auth (+12), payments & pricing (+15), transparency & trust (+34).

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

## Score by category

| Category | Weight | Buffer API + MCP | Post Bridge API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 55 | 35 | Buffer API + MCP +20 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 86 | 72 | Buffer API + MCP +14 |
| Agent ergonomics | 13% (16.2 this run) | 65 | 60 | Buffer API + MCP +5 |
| Security & auth | 14% (17.5 this run) | 56 | 44 | Buffer API + MCP +12 |
| Payments & pricing | 10% (12.5 this run) | 30 | 15 | Buffer API + MCP +15 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 73 | 76 | Post Bridge API + MCP +3 |
| Transparency & trust | 7% (8.8 this run) | 78 | 44 | Buffer API + MCP +34 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **62.3 · B** | **48.5 · D** | |

## Facts side by side

| Fact | Buffer API + MCP | Post Bridge API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Buffer | Post Bridge |
| Hosted endpoint | `https://api.buffer.com` | `https://api.post-bridge.com/v1` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | none | MIT |
| Tools exposed | 20 | 16 |
| 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 | yes |
| llms.txt | yes | yes |
| MCP registry | not listed | `io.github.jackfriks/post-bridge` |
| Last release | 2026-09-30 | 2026-09-09 |
| Popularity | 687 npm/wk | 17 stars, 51 npm/wk |
| Agent reviews | 3/5 (2) | 3.5/5 (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.

**Post Bridge API + MCP.** Hosted MCP with OAuth 2.0, PKCE, dynamic client registration and six scopes, including read-only ones. Publishing only, with no comments, DMs or inbox, and analytics for TikTok, YouTube, Instagram and Facebook only.

## 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

### Post Bridge API + MCP

1. Call list_social_accounts first, upload media, then create_post. Omit scheduled_at to publish at once
2. Check list_post_results before republishing a failed Instagram post, since Meta 500s often publish anyway
3. Set is_draft true when a person should approve the post
4. Put links for X in a reply, because captions sent to X lose their URLs
5. Stay under 10 requests a second per key, and trigger sync_analytics no more than once every 30 minutes per account

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