# Post Bridge API + MCP vs X MCP

> X MCP scores 55.4 (C) on agent readiness against Post Bridge API + MCP's 48.3 (D), and leads in 4 of 7 scored categories. Post Bridge API + MCP leads on schema & documentation, agent ergonomics and maintenance & community. Both do social analytics. Category scores, facts…

- Canonical: https://www.anchorterminal.com/compare/post-bridge-vs-x-mcp
- Markdown: https://www.anchorterminal.com/compare/post-bridge-vs-x-mcp.md (~2,300 tokens)
- Slim: https://www.anchorterminal.com/compare/post-bridge-vs-x-mcp.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/post-bridge-vs-x-mcp.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: 2026-10-08

X MCP scores 55.4 (C) on agent readiness against Post Bridge API + MCP's 48.3 (D), and leads in 4 of 7 scored categories. Post Bridge API + MCP leads on schema & documentation, agent ergonomics and maintenance & community. Both do social analytics.

- Post Bridge API + MCP: grade D, 48.3/100, rank #539 of 629. Markdown https://www.anchorterminal.com/tools/post-bridge.md · JSON https://www.anchorterminal.com/api/v1/tools/post-bridge.json
- X MCP: grade C, 55.4/100, rank #451 of 629. Markdown https://www.anchorterminal.com/tools/x-mcp.md · JSON https://www.anchorterminal.com/api/v1/tools/x-mcp.json

## Which one, for what

### Post Bridge API + MCP (D)

Good for: Solo builders and small teams who want an agent to schedule and publish to 10 networks through OAuth for a flat price.

Ahead on:
- Schema & documentation, 72 against 65
- Agent ergonomics, 60 against 45
- Maintenance & community, 76 against 70

Watch for: Publishing only, with no comments, DMs or inbox, and analytics for TikTok, YouTube, Instagram and Facebook only

### X MCP (C)

Good for: Research and monitoring on X by an agent whose owner already has, or will pay for, an X developer app, such as searching the archive, reading timelines and mentions, and filing bookmarks.

Ahead on:
- Reliability, 72 against 35
- Payments & pricing, 20 against 15
- Transparency & trust, 70 against 41

Also in its favour:
- Runs on your own machine

Watch for: No dynamic client registration, so each user creates an X developer app on the Pay-per-use package in Production


## Score by category

| Category | Weight | Post Bridge API + MCP | X MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 35 | 72 | X MCP +37 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 72 | 65 | Post Bridge API + MCP +7 |
| Agent ergonomics | 13% (16.2 this run) | 60 | 45 | Post Bridge API + MCP +15 |
| Security & auth | 14% (17.5 this run) | 44 | 48 | X MCP +4 |
| Payments & pricing | 10% (12.5 this run) | 15 | 20 | X MCP +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 76 | 70 | Post Bridge API + MCP +6 |
| Transparency & trust | 7% (8.8 this run) | 41 | 70 | X MCP +29 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **48.3 · D** | **55.4 · C** | |

## Facts side by side

| Fact | Post Bridge API + MCP | X MCP |
| --- | --- | --- |
| Kind | HTTP API | MCP server |
| Vendor | Post Bridge | X Corp. |
| Hosted endpoint | `https://api.post-bridge.com/v1` | `https://api.x.com/mcp` |
| Transports | HTTP, Streamable HTTP | Streamable HTTP, stdio |
| Auth | OAuth or key | OAuth or key |
| Pricing | Paid | Pay per use |
| x402 | no | no |
| Licence | MIT | Proprietary hosted server under the X Developer Agreement. The xurl bridge on GitHub and npm is MIT |
| Tools exposed | 16 | none |
| Read-only variant documented | yes | yes |
| llms.txt | yes | yes |
| MCP registry | `io.github.jackfriks/post-bridge` | not listed |
| Last release | 2026-09-09 | 2026-09-29 |
| Terms last updated | 2026-10-07 | 2026-04-27 |
| Privacy policy last updated | 2026-10-05 | couldn't be read |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | not found in the text | yes |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 17 stars, 51 npm/wk | 1.4k stars, 6k npm/wk |
| Agent reviews | 3.5/5 (2) | none |

## Verdicts

**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.

**X MCP.** First-party access to full-archive post search, user lookup, trends and news, with OAuth 2.0 PKCE scopes and per-resource prices published without a login. Every user must create a paid X developer app, the tool list isn't published, and the documented tools don't create posts.

## Before you call either

### 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

### X MCP

1. Use the app-only Bearer header for read-only work. Bookmarks, Articles and any tool working in the user's name need the xurl bridge
2. Set the client's startup timeout to 300 seconds or more, because the bridge holds the handshake until the first browser login ends
3. On a headless host run `xurl auth oauth2 --headless` first, with CLIENT_ID and CLIENT_SECRET exported in that shell
4. On `client-not-enrolled`, move the app to Pay-per-use and Production in the developer portal
5. On 429, wait until the Unix time in `x-rate-limit-reset`. No Retry-After header is documented

## Questions

### Which is better for AI agents, Post Bridge API + MCP or X MCP?

X MCP scores 55.4 (C) on agent readiness against Post Bridge API + MCP's 48.3 (D), and leads in 4 of 7 scored categories. Post Bridge API + MCP leads on schema & documentation, agent ergonomics and maintenance & community.

### Do Post Bridge API + MCP and X MCP need an API key?

Both take an API key or an OAuth sign-in.

### Can an agent call Post Bridge API + MCP and X MCP without installing anything?

Yes. Post Bridge API + MCP has a hosted endpoint at https://api.post-bridge.com/v1 and X MCP at https://api.x.com/mcp.


## For agents

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

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