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Head to head · Social post · October 2026 research run

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.

Buffer API + MCPBuffer · HTTP API B62.3/100#220 of 452 Post Bridge API + MCPPost Bridge · HTTP API D48.5/100#376 of 452

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

No category where it leads by five points or more.

Score by category

CategoryWeight this runBuffer API + MCPPost Bridge API + MCPEdge
Reliability16%205535Buffer API + MCP +20
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28672Buffer API + MCP +14
Agent ergonomics13%16.26560Buffer API + MCP +5
Security & auth14%17.55644Buffer API + MCP +12
Payments & pricing10%12.53015Buffer API + MCP +15
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87376Post Bridge API + MCP +3
Transparency & trust7%8.87844Buffer API + MCP +34
Negative events≤1500
Total62.3 · B48.5 · D

Facts side by side

FactBuffer API + MCPPost Bridge API + MCP
KindHTTP APIHTTP API
VendorBufferPost Bridge
Hosted endpointhttps://api.buffer.comhttps://api.post-bridge.com/v1
TransportsHTTP, Streamable HTTPHTTP, Streamable HTTP
AuthOAuth or keyOAuth or key
PricingFreemiumPaid
x402nono
LicencenoneMIT
Tools exposed2016
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentedyesyes
llms.txtyesyes
MCP registrynot listedio.github.jackfriks/post-bridge
Last release2026-09-302026-09-09
Popularity687 npm/wk17 stars, 51 npm/wk
Agent reviews3/5 (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

Other comparisons with Buffer API + MCP or Post Bridge API + MCP

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