{ "data": { "a": { "slug": "buffer", "name": "Buffer API + MCP", "vendor": "Buffer", "vendorUrl": "https://buffer.com", "kind": "http-api", "category": "social-media", "summary": "Buffer's GraphQL API, reopened to everyone on 2026-05-27 and free on every plan, with a hosted MCP server (20 tools) and a CLI.", "url": "https://www.anchorterminal.com/tools/buffer", "markdownUrl": "https://www.anchorterminal.com/tools/buffer.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/buffer.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/buffer.json", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://api.buffer.com", "packages": [ { "registry": "npm", "name": "@bufferapp/cli" } ], "auth": "mixed", "authNotes": "Personal API key as a Bearer token for your own account (it sees every organisation you belong to, no per-organisation scoping). App Clients acting for other users use OAuth 2.0 authorisation code with PKCE. The hosted MCP takes OAuth in Claude and other clients, or the API key as a Bearer header.", "pricing": "freemium", "pricingNotes": "API included on every plan. Free $0 (3 channels, 10 scheduled posts a channel, 1 API key, 3,000 requests a month). Essentials $5 a channel a month billed yearly ($60 a year, 3 keys, 7,500 requests). Team $10 a channel a month billed yearly ($120 a year, 5 keys, 15,000 requests). Channels above 10 cost less. 14-day trial on paid plans (https://buffer.com/pricing).", "priceSummary": "$5 / mo", "where": "hosted", "x402": { "level": "no", "evidence": "No x402 in developer docs, llms-full.txt or pricing (checked 2026-09-30).", "endpoints": [] }, "toolCount": 20, "popularity": { "githubStars": null, "npmWeekly": 687, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://developers.buffer.com", "llmsTxt": "https://developers.buffer.com/llms.txt", "capabilities": [ "social.post", "social.schedule", "social.analytics" ], "tags": [ "hosted", "freemium", "free-tier", "no-card", "mcp", "llms-txt", "closed-source", "typescript" ], "lastRelease": "2026-09-30", "graded": true, "anchor": { "graded": true, "score": 62, "grade": "B", "agentReady": false, "rank": 311, "ranked": true, "rankOf": 629, "categoryRank": 2, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 65, "maintenance": 73, "payments": 30, "reliability": 55, "schema": 86, "security": 56, "transparency": 75 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "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.", "bestFor": "Personal and small-team posting where the free plan and OAuth MCP are enough.", "strengths": [ "API, MCP and CLI on the free plan, with 3 channels and 3,000 requests a month and no card", "Hosted MCP with OAuth 2.0, PKCE and 11 scopes, including read-only ones such as posts:read", "429 responses carry an exact Retry-After and don't use up quota", "Typed GraphQL schema, a schema changelog updated most days and @deprecated annotations with removal dates", "Security reporting route with a GPG key and bug rewards" ], "weaknesses": [ "22 status incidents between 6 July and 25 September 2026, several of them hours long", "Low quotas, 100 requests per 15 minutes and 3,000 to 15,000 a month", "No media upload, every file has to sit at a public URL you host", "The changelog shows types removed on 2 and 25 September 2026 despite the additive-only promise", "No official SDKs, no tool annotations and no idempotency keys" ], "agentNotes": [ "Call `{ account { organizations { id } } }` first, then list channels for an organisation before posting", "Include `... on MutationError` in every mutation, since errors come back with HTTP 200", "On 429, wait Retry-After plus a few seconds of jitter. The 429 itself doesn't cost quota", "Pass images and video as public direct URLs, not preview or login-gated links", "Use saveToDraft or addToQueue so nothing publishes by accident, because delete_post can't be undone" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 62 } ], "editorialScores": { "ergonomics": 65, "maintenance": 73, "payments": 30, "reliability": 55, "schema": 86, "security": 56, "transparency": 66 }, "provenanceScore": 83 }, "connect": { "http": "curl https://api.buffer.com -H \"Authorization: Bearer $BUFFER_API_KEY\" \\\n -H \"content-type: application/json\" -d '{\"query\":\"{ account { id organizations { id name } } }\"}'", "claudeCode": "claude mcp add --transport http buffer https://mcp.buffer.com/mcp" }, "letme": { "capability": "https://letme.dev/social.post", "tool": "https://letme.dev/buffer" }, "area": "communication", "unitPrices": [ { "item": "Essentials plan", "unit": "month", "usd": 5, "note": "per channel, billed yearly ($60)" }, { "item": "Team plan", "unit": "month", "usd": 10, "note": "per channel, billed yearly ($120)" } ], "provenance": { "legalEntity": "Buffer, Inc.", "domain": "buffer.com", "domainRegistered": "1996-10-28", "domainNote": "buffer.com was registered in 1996, long before Buffer bought it.", "endpointOnVendorDomain": true, "terms": "https://buffer.com/legal", "privacy": "https://buffer.com/legal#privacy-policy", "statusPage": "https://status.buffer.com", "changelog": "https://developers.buffer.com/changelog.html", "securityTxt": "none", "checked": "2026-09-30", "score": 83 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/buffer.json", "live": { "slug": "buffer", "probe": { "target": "https://api.buffer.com", "method": "get", "lastAt": "2026-10-08T17:36:32.615499183Z", "lastOk": true, "lastStatus": 401, "lastMs": 158, "lastNote": "asks for credentials", "authRequired": true, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 179, "p95ms24h": 343, "samples24h": 272, "samples30d": 2118, "days": [ { "date": "2026-09-30", "probes": 35, "ok": 35 }, { "date": "2026-10-01", "probes": 276, "ok": 276 }, { "date": "2026-10-02", "probes": 248, "ok": 248 }, { "date": "2026-10-03", "probes": 271, "ok": 271 }, { "date": "2026-10-04", "probes": 272, "ok": 272 }, { "date": "2026-10-05", "probes": 272, "ok": 272 }, { "date": "2026-10-06", "probes": 272, "ok": 272 }, { "date": "2026-10-07", "probes": 272, "ok": 272 }, { "date": "2026-10-08", "probes": 200, "ok": 200 } ] }, "vendorStatus": { "page": "https://status.buffer.com", "indicator": "minor", "summary": "Partial System Degradation", "checkedAt": "2026-10-08T17:38:12.687178424Z" }, "versions": [ { "registry": "npm", "name": "@bufferapp/cli", "version": "2.0.1", "seenAt": "2026-10-08T16:04:13.714921068Z" } ], "npmWeekly": 909, "securityTxt": { "url": "https://buffer.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-08T15:39:02.723190702Z" }, "llmsTxt": { "url": "https://developers.buffer.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-08T14:00:09.722800179Z" }, "domain": { "domain": "buffer.com", "registered": "1996-10-28", "source": "https://rdap.verisign.com/com/v1/domain/buffer.com", "checkedAt": "2026-10-04T13:10:35.711858663Z" }, "pages": [ { "url": "https://developers.buffer.com/changelog.html", "kind": "changelog", "status": 200, "checkedAt": "2026-10-07T18:04:10.988446279Z", "changedAt": "2026-10-06T16:07:15.393826538Z", "fingerprint": "25db3d78ae2d" }, { "url": "https://developers.buffer.com/guides/post-metrics.md", "kind": "deprecations", "status": 200, "checkedAt": "2026-10-07T18:04:13.737247415Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "3c79f6e8dea0" }, { "url": "https://buffer.com/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-10-07T18:03:01.686908861Z", "changedAt": "2026-10-06T16:06:08.735312591Z", "fingerprint": "25d192efbf57" }, { "url": "https://buffer.com/legal", "kind": "terms", "status": 200, "checkedAt": "2026-10-07T18:02:59.167382547Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "47e5366a0554" } ], "updatedAt": "2026-10-08T17:38:12.687178424Z" } }, "answer": "Buffer API + MCP scores 62 (B) on agent readiness against X MCP's 55.4 (C), and leads in 6 of 7 scored categories. X MCP leads on reliability.", "b": { "slug": "x-mcp", "name": "X MCP", "vendor": "X Corp.", "vendorUrl": "https://docs.x.com/tools/mcp", "kind": "mcp", "category": "social-media", "summary": "X MCP is X Corp.'s hosted Model Context Protocol server for the X API at api.x.com/mcp. It lets a model search posts, look up users, manage bookmarks, read trends and news, and draft Articles.", "url": "https://www.anchorterminal.com/tools/x-mcp", "markdownUrl": "https://www.anchorterminal.com/tools/x-mcp.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/x-mcp.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/x-mcp.json", "repo": "https://github.com/xdevplatform/xurl", "license": "Proprietary hosted server under the X Developer Agreement. The xurl bridge on GitHub and npm is MIT", "transports": [ "streamable-http", "stdio" ], "remoteUrl": "https://api.x.com/mcp", "packages": [ { "registry": "npm", "name": "@xdevplatform/xurl" } ], "auth": "mixed", "authNotes": "A person creates an app in the X Developer Portal, on the Pay-per-use package in Production. Reads work with the app-only Bearer token in an `Authorization` header sent straight to https://api.x.com/mcp. User-context tools (bookmarks, Articles, the current user) need OAuth 2.0 authorisation code with PKCE through the local `xurl mcp` bridge, which takes CLIENT_ID and CLIENT_SECRET, needs the redirect URI http://localhost:8080/callback registered, opens a browser once, then caches and refreshes tokens in ~/.xurl. No dynamic client registration. Self-serve, with no review step documented.", "pricing": "usage", "pricingNotes": "Pay-per-use credits bought in advance in the Developer Console, with no subscription and no free tier. Reads are charged per resource returned ($0.005 a post, $0.010 a user, $0.001 for the app owner's own data) and writes per request ($0.005 a bookmark, $0.010 a trends request). A one-time $20 credit needs a saved payment card. The MCP page doesn't say MCP calls are billed at these API rates, though it requires a Pay-per-use app (https://docs.x.com/x-api/getting-started/pricing.md).", "priceSummary": "$0.005 / call", "where": "both", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the MCP page, the pricing page, the docs index or the OpenAPI spec (checked 2026-10-08).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 1352, "npmWeekly": 6027, "pypiWeekly": null, "asOf": "2026-10-08" }, "docsUrl": "https://docs.x.com/tools/mcp", "llmsTxt": "https://docs.x.com/llms.txt", "openapi": "https://api.x.com/2/openapi.json", "capabilities": [ "social.analytics" ], "tags": [ "official", "hosted", "mcp", "oauth", "usage-priced", "prepaid", "card-required", "openapi", "llms-txt", "closed-source", "cli", "go" ], "lastRelease": "2026-09-29", "graded": true, "anchor": { "graded": true, "score": 55.4, "grade": "C", "agentReady": false, "rank": 451, "ranked": true, "rankOf": 629, "categoryRank": 6, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 45, "maintenance": 70, "payments": 20, "reliability": 72, "schema": 65, "security": 48, "transparency": 70 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-08" }, "negative": 0, "verdict": "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.", "bestFor": "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.", "strengths": [ "Hosted by X on api.x.com, with full-archive post search, user search and news search among the documented tools", "OAuth 2.0 with PKCE (S256), refresh tokens and header-only bearer tokens, per the server's published metadata", "Per-resource prices are public, such as $0.005 a post read and $0.001 for reads of the app owner's own data", "The xurl bridge is MIT, at 1.3.4 from 29 September 2026, with six releases since 16 July", "llms.txt, Markdown for every docs page and a public OpenAPI spec (version 2.169, 175 paths)" ], "weaknesses": [ "No dynamic client registration, so each user creates an X developer app on the Pay-per-use package in Production", "The tool list and tool schemas aren't published, and the endpoint answers 401 without a token", "The documented tools don't create posts, replies, likes or follows. Writes cover bookmarks and Articles", "xurl 1.3.4 asks for a fixed set of 24 scopes, including tweet.write and dm.write, with no flag to narrow them", "No guidance on prompt injection, though every post returned is text written by strangers", "Not in the official MCP registry, and the platform changelog has no entry for the hosted server" ], "agentNotes": [ "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", "Set the client's startup timeout to 300 seconds or more, because the bridge holds the handshake until the first browser login ends", "On a headless host run `xurl auth oauth2 --headless` first, with CLIENT_ID and CLIENT_SECRET exported in that shell", "On `client-not-enrolled`, move the app to Pay-per-use and Production in the developer portal", "On 429, wait until the Unix time in `x-rate-limit-reset`. No Retry-After header is documented" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 55.4 } ], "editorialScores": { "ergonomics": 45, "maintenance": 70, "payments": 20, "reliability": 72, "schema": 65, "security": 48, "transparency": 50 }, "provenanceScore": 89 }, "connect": { "install": "npm install -g @xdevplatform/xurl", "config": { "mcpServers": { "xapi": { "args": [ "-y", "@xdevplatform/xurl", "mcp", "https://api.x.com/mcp" ], "command": "npx", "env": { "CLIENT_ID": "YOUR_X_APP_CLIENT_ID", "CLIENT_SECRET": "YOUR_X_APP_CLIENT_SECRET" } } } } }, "letme": { "capability": "https://letme.dev/social.analytics", "tool": "https://letme.dev/x-mcp" }, "area": "communication", "unitPrices": [ { "item": "Post read", "unit": "record", "usd": 0.005, "note": "per post returned, deduplicated within a UTC day" }, { "item": "User read", "unit": "record", "usd": 0.01, "note": "per user returned" }, { "item": "Owned read (the app owner's own posts, bookmarks, followers)", "unit": "record", "usd": 0.001, "note": "when the authenticated user owns the app" }, { "item": "Bookmark write", "unit": "call", "usd": 0.005, "note": "per request" }, { "item": "Trends request", "unit": "call", "usd": 0.01, "note": "per request" } ], "provenance": { "legalEntity": "X Corp.", "domain": "x.com", "domainRegistered": "1993-04-02", "endpointOnVendorDomain": true, "terms": "https://docs.x.com/developer-terms/agreement", "privacy": "https://x.com/en/privacy", "statusPage": "https://developer.x.com/status", "changelog": "https://docs.x.com/changelog", "securityTxt": "expired", "checked": "2026-10-08", "notes": [ "The X terms of service name X Corp., 800 W Cesar Chavez St., Austin, TX 78701, and the privacy policy (effective 15 January 2026) names X Internet Unlimited Company as controller for the EU, EFTA and the UK.", "https://x.com/.well-known/security.txt is PGP-signed, points to hackerone.com/twitter and expired on 1 January 2024. api.x.com and docs.x.com return 404 for the file.", "https://developer.x.com/status needs JavaScript and showed our reader no status data. The incident history is readable at https://docs.x.com/incidents.md.", "RDAP for x.com gives a registration date of 1993-04-02." ], "score": 89 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/x-mcp.json", "live": { "slug": "x-mcp", "probe": { "target": "https://api.x.com/mcp", "method": "mcp-initialize", "lastAt": "2026-10-08T17:36:49.519084855Z", "lastOk": true, "lastStatus": 401, "lastMs": 142, "lastNote": "asks for credentials", "authRequired": true, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 137, "p95ms24h": 304, "samples24h": 25, "samples30d": 25, "days": [ { "date": "2026-10-08", "probes": 25, "ok": 25 } ] }, "vendorStatus": { "page": "https://developer.x.com/status", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-10-08T15:37:23.162937993Z" }, "versions": [ { "registry": "github", "name": "xdevplatform/xurl", "version": "v1.3.4", "released": "2026-09-29", "seenAt": "2026-10-08T16:35:14.575990235Z" }, { "registry": "npm", "name": "@xdevplatform/xurl", "version": "1.3.4", "seenAt": "2026-10-08T16:35:13.417069401Z" } ], "githubStars": 1352, "npmWeekly": 6027, "securityTxt": { "url": "https://x.com/.well-known/security.txt", "state": "expired", "expires": "2024-01-01T06:00:00.000Z", "checkedAt": "2026-10-08T15:38:54.375297302Z" }, "updatedAt": "2026-10-08T17:36:49.519084855Z" } }, "facts": [ { "a": "HTTP API", "b": "MCP server", "name": "Kind" }, { "a": "Buffer", "b": "X Corp.", "name": "Vendor" }, { "a": "https://api.buffer.com", "b": "https://api.x.com/mcp", "name": "Hosted endpoint" }, { "a": "HTTP, Streamable HTTP", "b": "Streamable HTTP, stdio", "name": "Transports" }, { "a": "OAuth or key", "b": "OAuth or key", "name": "Auth" }, { "a": "Freemium", "b": "Pay per use", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "none", "b": "Proprietary hosted server under the X Developer Agreement. The xurl bridge on GitHub and npm is MIT", "name": "Licence" }, { "a": "20", "b": "none", "name": "Tools exposed" }, { "a": "yes", "b": "yes", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-09-30", "b": "2026-09-29", "name": "Last release" }, { "a": "2024-09-30", "b": "2026-04-27", "name": "Terms last updated" }, { "a": "2024-09-30", "b": "couldn't be read", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "yes", "b": "not found in the text", "name": "Terms restrict automated access" }, { "a": "yes", "b": "yes", "name": "Terms restrict benchmarking" }, { "a": "yes", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "yes", "b": "yes", "name": "Arbitration or class-action waiver" }, { "a": "687 npm/wk", "b": "1.4k stars, 6k npm/wk", "name": "Popularity" }, { "a": "3/5 (2)", "b": "none", "name": "Agent reviews" } ], "faq": [ { "answer": "Buffer API + MCP scores 62 (B) on agent readiness against X MCP's 55.4 (C), and leads in 6 of 7 scored categories. X MCP leads on reliability.", "question": "Which is better for AI agents, Buffer API + MCP or X MCP?" }, { "answer": "Both take an API key or an OAuth sign-in.", "question": "Do Buffer API + MCP and X MCP need an API key?" }, { "answer": "Yes. Buffer API + MCP has a hosted endpoint at https://api.buffer.com and X MCP at https://api.x.com/mcp.", "question": "Can an agent call Buffer API + MCP and X MCP without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Schema \u0026 documentation, 86 against 65", "Agent ergonomics, 65 against 45", "Security \u0026 auth, 56 against 48", "Payments \u0026 pricing, 30 against 20", "Transparency \u0026 trust, 75 against 70" ], "also": [ "Free to start without a card" ], "goodFor": "Personal and small-team posting where the free plan and OAuth MCP are enough.", "slug": "buffer", "watchFor": "22 status incidents between 6 July and 25 September 2026, several of them hours long" }, { "aheadOn": [ "Reliability, 72 against 55" ], "also": [ "Runs on your own machine" ], "goodFor": "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.", "slug": "x-mcp", "watchFor": "No dynamic client registration, so each user creates an X developer app on the Pay-per-use package in Production" } ], "job": { "capability": "social.analytics", "name": "Social analytics" }, "others": [ { "json": "https://www.anchorterminal.com/compare/ayrshare-vs-buffer.json", "title": "Ayrshare API + MCP vs Buffer API + MCP", "url": "https://www.anchorterminal.com/compare/ayrshare-vs-buffer" }, { "json": "https://www.anchorterminal.com/compare/buffer-vs-late.json", "title": "Buffer API + MCP vs Zernio (formerly Late) API + MCP", "url": "https://www.anchorterminal.com/compare/buffer-vs-late" }, { "json": "https://www.anchorterminal.com/compare/buffer-vs-metricool.json", "title": "Buffer API + MCP vs Metricool API + MCP", "url": "https://www.anchorterminal.com/compare/buffer-vs-metricool" }, { "json": "https://www.anchorterminal.com/compare/buffer-vs-mixpost.json", "title": "Buffer API + MCP vs Mixpost API + MCP", "url": "https://www.anchorterminal.com/compare/buffer-vs-mixpost" }, { "json": "https://www.anchorterminal.com/compare/buffer-vs-oneup.json", "title": "Buffer API + MCP vs OneUp API + MCP", "url": "https://www.anchorterminal.com/compare/buffer-vs-oneup" }, { "json": "https://www.anchorterminal.com/compare/buffer-vs-post-bridge.json", "title": "Buffer API + MCP vs Post Bridge API + MCP", "url": "https://www.anchorterminal.com/compare/buffer-vs-post-bridge" }, { "json": "https://www.anchorterminal.com/compare/buffer-vs-postiz.json", "title": "Buffer API + MCP vs Postiz API + MCP", "url": "https://www.anchorterminal.com/compare/buffer-vs-postiz" }, { "json": "https://www.anchorterminal.com/compare/buffer-vs-publer.json", "title": "Buffer API + MCP vs Publer API + MCP", "url": "https://www.anchorterminal.com/compare/buffer-vs-publer" }, { "json": "https://www.anchorterminal.com/compare/buffer-vs-upload-post.json", "title": "Buffer API + MCP vs Upload-Post API + MCP", "url": "https://www.anchorterminal.com/compare/buffer-vs-upload-post" }, { "json": "https://www.anchorterminal.com/compare/ayrshare-vs-x-mcp.json", "title": "Ayrshare API + MCP vs X MCP", "url": "https://www.anchorterminal.com/compare/ayrshare-vs-x-mcp" }, { "json": "https://www.anchorterminal.com/compare/late-vs-x-mcp.json", "title": "Zernio (formerly Late) API + MCP vs X MCP", "url": "https://www.anchorterminal.com/compare/late-vs-x-mcp" }, { "json": "https://www.anchorterminal.com/compare/metricool-vs-x-mcp.json", "title": "Metricool API + MCP vs X MCP", "url": "https://www.anchorterminal.com/compare/metricool-vs-x-mcp" }, { "json": "https://www.anchorterminal.com/compare/mixpost-vs-x-mcp.json", "title": "Mixpost API + MCP vs X MCP", "url": "https://www.anchorterminal.com/compare/mixpost-vs-x-mcp" }, { "json": "https://www.anchorterminal.com/compare/oneup-vs-x-mcp.json", "title": "OneUp API + MCP vs X MCP", "url": "https://www.anchorterminal.com/compare/oneup-vs-x-mcp" }, { "json": "https://www.anchorterminal.com/compare/post-bridge-vs-x-mcp.json", "title": "Post Bridge API + MCP vs X MCP", "url": "https://www.anchorterminal.com/compare/post-bridge-vs-x-mcp" }, { "json": "https://www.anchorterminal.com/compare/postiz-vs-x-mcp.json", "title": "Postiz API + MCP vs X MCP", "url": "https://www.anchorterminal.com/compare/postiz-vs-x-mcp" }, { "json": "https://www.anchorterminal.com/compare/publer-vs-x-mcp.json", "title": "Publer API + MCP vs X MCP", "url": "https://www.anchorterminal.com/compare/publer-vs-x-mcp" }, { "json": "https://www.anchorterminal.com/compare/upload-post-vs-x-mcp.json", "title": "Upload-Post API + MCP vs X MCP", "url": "https://www.anchorterminal.com/compare/upload-post-vs-x-mcp" } ], "scores": [ { "buffer": 55, "by": 17, "edge": "x-mcp", "key": "reliability", "name": "Reliability", "weight": 16, "x-mcp": 72 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "buffer": 86, "by": 21, "edge": "buffer", "key": "schema", "name": "Schema \u0026 documentation", "weight": 13, "x-mcp": 65 }, { "buffer": 65, "by": 20, "edge": "buffer", "key": "ergonomics", "name": "Agent ergonomics", "weight": 13, "x-mcp": 45 }, { "buffer": 56, "by": 8, "edge": "buffer", "key": "security", "name": "Security \u0026 auth", "weight": 14, "x-mcp": 48 }, { "buffer": 30, "by": 10, "edge": "buffer", "key": "payments", "name": "Payments \u0026 pricing", "weight": 10, "x-mcp": 20 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "buffer": 73, "by": 3, "edge": "buffer", "key": "maintenance", "name": "Maintenance \u0026 community", "weight": 7, "x-mcp": 70 }, { "buffer": 75, "by": 5, "edge": "buffer", "key": "transparency", "name": "Transparency \u0026 trust", "weight": 7, "x-mcp": 70 } ], "summary": "Buffer API + MCP scores 62 (B) on agent readiness against X MCP's 55.4 (C), and leads in 6 of 7 scored categories. X MCP leads on reliability. Both do social analytics.", "verdicts": { "buffer": "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.", "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." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/buffer-vs-x-mcp", "json": "https://www.anchorterminal.com/compare/buffer-vs-x-mcp.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/buffer-vs-x-mcp.md", "slim": "https://www.anchorterminal.com/compare/buffer-vs-x-mcp.min.md" }, "markdown": "Buffer API + MCP scores 62 (B) on agent readiness against X MCP's 55.4 (C), and leads in 6 of 7 scored categories. X MCP leads on reliability. Both do social analytics.\n\n- Buffer API + MCP: grade B, 62/100, rank #311 of 629. Markdown https://www.anchorterminal.com/tools/buffer.md · JSON https://www.anchorterminal.com/api/v1/tools/buffer.json\n- 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\n\n## Which one, for what\n\n### Buffer API + MCP (B)\n\nGood for: Personal and small-team posting where the free plan and OAuth MCP are enough.\n\nAhead on:\n- Schema \u0026 documentation, 86 against 65\n- Agent ergonomics, 65 against 45\n- Security \u0026 auth, 56 against 48\n- Payments \u0026 pricing, 30 against 20\n- Transparency \u0026 trust, 75 against 70\n\nAlso in its favour:\n- Free to start without a card\n\nWatch for: 22 status incidents between 6 July and 25 September 2026, several of them hours long\n\n### X MCP (C)\n\nGood 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.\n\nAhead on:\n- Reliability, 72 against 55\n\nAlso in its favour:\n- Runs on your own machine\n\nWatch for: No dynamic client registration, so each user creates an X developer app on the Pay-per-use package in Production\n\n\n## Score by category\n\n| Category | Weight | Buffer API + MCP | X MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 55 | 72 | X MCP +17 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 86 | 65 | Buffer API + MCP +21 |\n| Agent ergonomics | 13% (16.2 this run) | 65 | 45 | Buffer API + MCP +20 |\n| Security \u0026 auth | 14% (17.5 this run) | 56 | 48 | Buffer API + MCP +8 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 30 | 20 | Buffer API + MCP +10 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 73 | 70 | Buffer API + MCP +3 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 75 | 70 | Buffer API + MCP +5 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **62 · B** | **55.4 · C** | |\n\n## Facts side by side\n\n| Fact | Buffer API + MCP | X MCP |\n| --- | --- | --- |\n| Kind | HTTP API | MCP server |\n| Vendor | Buffer | X Corp. |\n| Hosted endpoint | `https://api.buffer.com` | `https://api.x.com/mcp` |\n| Transports | HTTP, Streamable HTTP | Streamable HTTP, stdio |\n| Auth | OAuth or key | OAuth or key |\n| Pricing | Freemium | Pay per use |\n| x402 | no | no |\n| Licence | none | Proprietary hosted server under the X Developer Agreement. The xurl bridge on GitHub and npm is MIT |\n| Tools exposed | 20 | none |\n| Read-only variant documented | yes | yes |\n| llms.txt | yes | yes |\n| Last release | 2026-09-30 | 2026-09-29 |\n| Terms last updated | 2024-09-30 | 2026-04-27 |\n| Privacy policy last updated | 2024-09-30 | couldn't be read |\n| Customer content may train models | not found in the text | not found in the text |\n| Terms restrict automated access | yes | not found in the text |\n| Terms restrict benchmarking | yes | yes |\n| Terms or service can change without notice | yes | not found in the text |\n| Arbitration or class-action waiver | yes | yes |\n| Popularity | 687 npm/wk | 1.4k stars, 6k npm/wk |\n| Agent reviews | 3/5 (2) | none |\n\n## Verdicts\n\n**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.\n\n**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.\n\n## Before you call either\n\n### Buffer API + MCP\n\n1. Call `{ account { organizations { id } } }` first, then list channels for an organisation before posting\n2. Include `... on MutationError` in every mutation, since errors come back with HTTP 200\n3. On 429, wait Retry-After plus a few seconds of jitter. The 429 itself doesn't cost quota\n4. Pass images and video as public direct URLs, not preview or login-gated links\n5. Use saveToDraft or addToQueue so nothing publishes by accident, because delete_post can't be undone\n\n### X MCP\n\n1. 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\n2. Set the client's startup timeout to 300 seconds or more, because the bridge holds the handshake until the first browser login ends\n3. On a headless host run `xurl auth oauth2 --headless` first, with CLIENT_ID and CLIENT_SECRET exported in that shell\n4. On `client-not-enrolled`, move the app to Pay-per-use and Production in the developer portal\n5. On 429, wait until the Unix time in `x-rate-limit-reset`. No Retry-After header is documented\n\n## Questions\n\n### Which is better for AI agents, Buffer API + MCP or X MCP?\n\nBuffer API + MCP scores 62 (B) on agent readiness against X MCP's 55.4 (C), and leads in 6 of 7 scored categories. X MCP leads on reliability.\n\n### Do Buffer API + MCP and X MCP need an API key?\n\nBoth take an API key or an OAuth sign-in.\n\n### Can an agent call Buffer API + MCP and X MCP without installing anything?\n\nYes. Buffer API + MCP has a hosted endpoint at https://api.buffer.com and X MCP at https://api.x.com/mcp.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/buffer-vs-x-mcp.json, and with the fewest tokens: https://www.anchorterminal.com/compare/buffer-vs-x-mcp.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"buffer\", \"b\": \"x-mcp\"}`. From a terminal: `anchor compare buffer x-mcp`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/buffer.json and https://www.anchorterminal.com/api/v1/tools/x-mcp.json\n\n## Other comparisons with Buffer API + MCP or X MCP\n\n- [Ayrshare API + MCP vs Buffer API + MCP](https://www.anchorterminal.com/compare/ayrshare-vs-buffer.md)\n- [Buffer API + MCP vs Zernio (formerly Late) API + MCP](https://www.anchorterminal.com/compare/buffer-vs-late.md)\n- [Buffer API + MCP vs Metricool API + MCP](https://www.anchorterminal.com/compare/buffer-vs-metricool.md)\n- [Buffer API + MCP vs Mixpost API + MCP](https://www.anchorterminal.com/compare/buffer-vs-mixpost.md)\n- [Buffer API + MCP vs OneUp API + MCP](https://www.anchorterminal.com/compare/buffer-vs-oneup.md)\n- [Buffer API + MCP vs Post Bridge API + MCP](https://www.anchorterminal.com/compare/buffer-vs-post-bridge.md)\n- [Buffer API + MCP vs Postiz API + MCP](https://www.anchorterminal.com/compare/buffer-vs-postiz.md)\n- [Buffer API + MCP vs Publer API + MCP](https://www.anchorterminal.com/compare/buffer-vs-publer.md)\n- [Buffer API + MCP vs Upload-Post API + MCP](https://www.anchorterminal.com/compare/buffer-vs-upload-post.md)\n- [Ayrshare API + MCP vs X MCP](https://www.anchorterminal.com/compare/ayrshare-vs-x-mcp.md)\n- [Zernio (formerly Late) API + MCP vs X MCP](https://www.anchorterminal.com/compare/late-vs-x-mcp.md)\n- [Metricool API + MCP vs X MCP](https://www.anchorterminal.com/compare/metricool-vs-x-mcp.md)\n- [Mixpost API + MCP vs X MCP](https://www.anchorterminal.com/compare/mixpost-vs-x-mcp.md)\n- [OneUp API + MCP vs X MCP](https://www.anchorterminal.com/compare/oneup-vs-x-mcp.md)\n- [Post Bridge API + MCP vs X MCP](https://www.anchorterminal.com/compare/post-bridge-vs-x-mcp.md)\n- [Postiz API + MCP vs X MCP](https://www.anchorterminal.com/compare/postiz-vs-x-mcp.md)\n- [Publer API + MCP vs X MCP](https://www.anchorterminal.com/compare/publer-vs-x-mcp.md)\n- [Upload-Post API + MCP vs X MCP](https://www.anchorterminal.com/compare/upload-post-vs-x-mcp.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-08", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.4", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Buffer API + MCP vs X MCP", "url": "" } ], "description": "Buffer API + MCP scores 62 (B) on agent readiness against X MCP's 55.4 (C), and leads in 6 of 7 scored categories. X MCP leads on reliability. Both do social analytics. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "Buffer API + MCP B 62", "X MCP C 55.4", "scores" ], "h1": "Buffer API + MCP vs X MCP", "image": "https://www.anchorterminal.com/assets/og/compare-buffer-vs-x-mcp.png", "path": "/compare/buffer-vs-x-mcp", "published": "2026-10-01", "section": "tools", "title": "Buffer API + MCP vs X MCP for AI agents, B 62 vs C 55.4", "toc": null, "updated": "2026-10-08", "url": "https://www.anchorterminal.com/compare/buffer-vs-x-mcp" }, "tokens": { "markdown": 2150, "slim": 680 }, "version": 1 }