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Head to head · Social analytics · October 2026 research run

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.

Post Bridge API + MCPPost Bridge · HTTP API D48.3/100#489 of 578 X MCPX Corp. · MCP server C55.4/100#409 of 578

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

CategoryWeight this runPost Bridge API + MCPX MCPEdge
Reliability16%203572X MCP +37
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27265Post Bridge API + MCP +7
Agent ergonomics13%16.26045Post Bridge API + MCP +15
Security & auth14%17.54448X MCP +4
Payments & pricing10%12.51520X MCP +5
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87670Post Bridge API + MCP +6
Transparency & trust7%8.84170X MCP +29
Negative events≤1500
Total48.3 · D55.4 · C

Facts side by side

FactPost Bridge API + MCPX MCP
KindHTTP APIMCP server
VendorPost BridgeX Corp.
Hosted endpointhttps://api.post-bridge.com/v1https://api.x.com/mcp
TransportsHTTP, Streamable HTTPStreamable HTTP, stdio
AuthOAuth or keyOAuth or key
PricingPaidPay per use
x402nono
LicenceMITProprietary hosted server under the X Developer Agreement. The xurl bridge on GitHub and npm is MIT
Tools exposed16none
Read-only variant documentedyesyes
llms.txtyesyes
MCP registryio.github.jackfriks/post-bridgenot listed
Last release2026-09-092026-09-29
Terms last updated2026-10-072026-04-27
Privacy policy last updated2026-10-05couldn't be read
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessnot found in the textnot found in the text
Terms restrict benchmarkingnot found in the textyes
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waivernot found in the textyes
Popularity17 stars, 51 npm/wk1.4k stars, 6k npm/wk
Agent reviews3.5/5 (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.

Other comparisons with Post Bridge API + MCP or X MCP

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