{
  "data": {
    "a": {
      "slug": "late",
      "name": "Zernio (formerly Late) API + MCP",
      "vendor": "Zernio",
      "vendorUrl": "https://zernio.com",
      "kind": "http-api",
      "category": "social-media",
      "summary": "Social media and messaging API (formerly Late at getlate.dev, renamed Zernio in 2026) for 16 channels plus ads, inbox, SMS and WhatsApp.",
      "url": "https://www.anchorterminal.com/tools/late",
      "markdownUrl": "https://www.anchorterminal.com/tools/late.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/late.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/late.json",
      "transports": [
        "http",
        "streamable-http",
        "stdio"
      ],
      "remoteUrl": "https://zernio.com/api/v1",
      "packages": [
        {
          "registry": "npm",
          "name": "@zernio/node"
        },
        {
          "registry": "pypi",
          "name": "zernio-sdk"
        }
      ],
      "auth": "mixed",
      "authNotes": "API key as a Bearer token. The hosted MCP accepts OAuth 2.1 with PKCE and dynamic client registration, or the API key as a Bearer header. A local stdio MCP ships in the Python SDK (uvx --from zernio-sdk[mcp] zernio-mcp).",
      "pricing": "freemium",
      "pricingNotes": "Billed per connected account each month, no plans. Accounts 1 and 2 free with no card, 3 to 10 at $6 each, 11 to 100 at $3, 101 and up at $1 (10 accounts cost $48). 10,000 inbox messages a month free, then $1 per 10,000. X API calls are passed through at $0.005 to $0.20 a request. SMS from $0.008 a message in the US (https://zernio.com/pricing).",
      "priceSummary": "$6 / mo",
      "where": "both",
      "x402": {
        "level": "no",
        "evidence": "No x402 in docs, llms.txt or pricing (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": null,
        "npmWeekly": 45849,
        "pypiWeekly": 44099,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://docs.zernio.com",
      "llmsTxt": "https://docs.zernio.com/llms.txt",
      "openapi": "https://zernio.com/openapi.yaml",
      "registryName": "com.zernio/zernio",
      "capabilities": [
        "social.post",
        "social.schedule",
        "social.analytics",
        "social.comments",
        "social.media-upload"
      ],
      "tags": [
        "hosted",
        "freemium",
        "free-tier",
        "no-card",
        "mcp",
        "llms-txt",
        "openapi",
        "typescript",
        "python",
        "webhooks",
        "sms",
        "whatsapp"
      ],
      "lastRelease": "2026-10-01",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 67.5,
        "grade": "B",
        "agentReady": false,
        "rank": 139,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 1,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 88,
          "maintenance": 87,
          "payments": 40,
          "reliability": 80,
          "schema": 83,
          "security": 57,
          "transparency": 59
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": -4,
        "negativeNotes": [
          "2026-09-29 to 2026-10-01. The changelog marks several changes BREAKING on the day they shipped, with no notice period. Timestamps without an offset now follow the profile timezone instead of UTC (29 September), accountId is required to edit or unpublish a multi-account post (30 September), and LinkedIn multi-account connect needs selections instead of accountType (1 October). We count the label as disclosure but not notice. -4 (https://docs.zernio.com/changelog)"
        ],
        "verdict": "Idempotency-Key on post creation and other writes, kept 24 hours, with an Idempotent-Replayed header on replays. Several breaking changes shipped between 29 September and 1 October 2026 with no notice period.",
        "strengths": [
          "Idempotency-Key on post creation and other writes, kept 24 hours, with an Idempotent-Replayed header on replays",
          "OpenAPI 3.1 spec (API version 1.194.0) and a Node SDK regenerated from it several times a day",
          "Hosted MCP with OAuth scopes, tool annotations and search_tools for the long tail",
          "Restricted keys created through POST /v1/api-keys with any of ten resource groups switched off",
          "2 accounts free with no card, then $6, $3 or $1 an account"
        ],
        "weaknesses": [
          "Several breaking changes shipped between 29 September and 1 October 2026 with no notice period",
          "Reddit and TikTok posting budgets are shared across all Zernio customers",
          "SDKs are pre-1.0 (0.2.1056) and release many times a day",
          "No security.txt, no subprocessor list and no DPA linked from the privacy policy",
          "Renamed from Late in 2026, so docs and packages exist under both names"
        ],
        "agentNotes": [
          "Send an Idempotency-Key (a fresh UUID per post) on POST /v1/posts and reuse it only on a retry",
          "Give timestamps an explicit offset, because times without one now follow the profile timezone rather than UTC",
          "Pass accountId when editing or unpublishing a post that targets several accounts",
          "Wait Retry-After on 429. Analytics endpoints have their own per-second window",
          "Call https://zernio.com/api/v1, not the old getlate.dev base, and pin the SDK version"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 4,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "B",
            "methodology": "0.3",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 67.5
          }
        ],
        "editorialScores": {
          "ergonomics": 88,
          "maintenance": 87,
          "payments": 40,
          "reliability": 80,
          "schema": 83,
          "security": 57,
          "transparency": 40
        },
        "provenanceScore": 78
      },
      "connect": {
        "http": "curl https://zernio.com/api/v1/accounts -H \"Authorization: Bearer $ZERNIO_API_KEY\"",
        "claudeCode": "claude mcp add --transport http zernio https://mcp.zernio.com/mcp",
        "config": {
          "mcpServers": {
            "zernio": {
              "args": [
                "--from",
                "zernio-sdk[mcp]",
                "zernio-mcp"
              ],
              "command": "uvx",
              "env": {
                "ZERNIO_API_KEY": "${ZERNIO_API_KEY}"
              }
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/social.post",
        "tool": "https://letme.dev/late"
      },
      "area": "communication",
      "unitPrices": [
        {
          "item": "Connected account (3 to 10)",
          "unit": "month",
          "usd": 6,
          "note": "per account, first 2 free"
        },
        {
          "item": "Connected account (11 to 100)",
          "unit": "month",
          "usd": 3,
          "note": "per account"
        },
        {
          "item": "Connected account (101 and up)",
          "unit": "month",
          "usd": 1,
          "note": "per account"
        },
        {
          "item": "SMS to the US",
          "unit": "message",
          "usd": 0.008
        }
      ],
      "provenance": {
        "legalEntity": "ZERNIO SOFTWARE SL",
        "domain": "zernio.com",
        "domainRegistered": "2025-08-14",
        "endpointOnVendorDomain": true,
        "terms": "https://zernio.com/tos",
        "privacy": "https://zernio.com/privacy-policy",
        "statusPage": "https://www.zernio-status.com",
        "changelog": "https://docs.zernio.com/changelog",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "notes": [
          "Formerly Late at getlate.dev (registered 2025-06-06), which now redirects to zernio.com",
          "Rebrand date not published. @zernio/node first appeared on npm on 2026-03-17",
          "npm weekly counts @zernio/node only. The legacy @getlatedev/node had 29,912 and late-sdk 18,958 more"
        ],
        "score": 78
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/late.json",
      "live": {
        "slug": "late",
        "probe": {
          "target": "https://zernio.com/api/v1",
          "method": "get",
          "lastAt": "2026-10-05T00:15:25.499674837Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 50,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 59,
          "p95ms24h": 169,
          "samples24h": 272,
          "samples30d": 1105,
          "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": 3,
              "ok": 3
            }
          ]
        },
        "vendorStatus": {
          "page": "https://www.zernio-status.com",
          "indicator": "unknown",
          "summary": "no machine-readable status found",
          "checkedAt": "2026-10-04T21:40:11.998588022Z"
        },
        "versions": [
          {
            "registry": "mcp-registry",
            "name": "com.zernio/zernio",
            "version": "1.0.0",
            "seenAt": "2026-10-04T23:42:40.113054682Z"
          },
          {
            "registry": "npm",
            "name": "@zernio/node",
            "version": "0.2.1080",
            "seenAt": "2026-10-04T16:31:32.9412192Z"
          },
          {
            "registry": "pypi",
            "name": "zernio-sdk",
            "version": "1.4.1093",
            "released": "2026-10-04",
            "seenAt": "2026-10-04T16:31:33.370324025Z"
          }
        ],
        "npmWeekly": 50936,
        "pypiWeekly": 39221,
        "securityTxt": {
          "url": "https://zernio.com/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-04T15:16:04.939436035Z"
        },
        "llmsTxt": {
          "url": "https://docs.zernio.com/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-04T15:17:56.630637458Z"
        },
        "domain": {
          "domain": "zernio.com",
          "registered": "2025-08-14",
          "source": "https://rdap.verisign.com/com/v1/domain/zernio.com",
          "checkedAt": "2026-10-04T13:05:28.738999562Z"
        },
        "pages": [
          {
            "url": "https://docs.zernio.com/changelog",
            "kind": "changelog",
            "status": 200,
            "checkedAt": "2026-10-04T15:44:19.886171541Z",
            "changedAt": "2026-10-04T15:44:19.886171541Z",
            "fingerprint": "3d44f3e3d275"
          },
          {
            "url": "https://zernio.com/rebrand",
            "kind": "deprecations",
            "status": 200,
            "checkedAt": "2026-10-04T15:53:12.361720232Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "f1c88a2ba666"
          },
          {
            "url": "https://zernio.com/pricing",
            "kind": "pricing",
            "status": 200,
            "checkedAt": "2026-10-04T15:53:07.96997682Z",
            "changedAt": "2026-10-02T15:29:11.484680525Z",
            "fingerprint": "9bd203560edb"
          },
          {
            "url": "https://zernio.com/privacy-policy",
            "kind": "privacy",
            "status": 200,
            "checkedAt": "2026-10-04T15:53:10.251640706Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "40780a4b4335"
          },
          {
            "url": "https://zernio.com/tos",
            "kind": "terms",
            "status": 200,
            "checkedAt": "2026-10-04T15:53:14.380799679Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "96d6ae4a3478"
          }
        ],
        "updatedAt": "2026-10-05T00:15:25.499674837Z"
      }
    },
    "b": {
      "slug": "post-bridge",
      "name": "Post Bridge API + MCP",
      "vendor": "Post Bridge",
      "vendorUrl": "https://www.post-bridge.com",
      "kind": "http-api",
      "category": "social-media",
      "summary": "Publishing-only scheduler with a REST API, a hosted MCP server and a CLI.",
      "url": "https://www.anchorterminal.com/tools/post-bridge",
      "markdownUrl": "https://www.anchorterminal.com/tools/post-bridge.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/post-bridge.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/post-bridge.json",
      "repo": "https://github.com/post-bridge-hq/agent-mode",
      "license": "MIT",
      "transports": [
        "http",
        "streamable-http"
      ],
      "remoteUrl": "https://api.post-bridge.com/v1",
      "packages": [
        {
          "registry": "npm",
          "name": "postbridge-cli"
        }
      ],
      "auth": "mixed",
      "authNotes": "REST API takes a pb_live_ API key as a Bearer header. The hosted MCP does OAuth with PKCE, dynamic client registration and six scopes (posts:read, posts:write, analytics:read, accounts:read, media:read, media:write), and also accepts the API key as a Bearer header or as a ?key= URL parameter.",
      "pricing": "paid",
      "pricingNotes": "7-day trial (the checkout reads $0.00 due today, with no statement on cards). Marketer $39 a month for 15 connected accounts. Operator $99 a month for 99 accounts, then $1 per account a month. Unlimited posts, and API, CLI and MCP on both plans. Yearly billing gives 2 months free. The pricing FAQ says free users get 5 posts a month, but no free plan appears in the plan table (https://www.post-bridge.com/pricing).",
      "priceSummary": "$39 / mo",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402 or per-call payment in the API reference, llms.txt or pricing (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": 16,
      "popularity": {
        "githubStars": 17,
        "npmWeekly": 51,
        "pypiWeekly": null,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://api.post-bridge.com/reference",
      "llmsTxt": "https://www.post-bridge.com/llms.txt",
      "openapi": "https://api.post-bridge.com/openapi.json",
      "registryName": "io.github.jackfriks/post-bridge",
      "capabilities": [
        "social.post",
        "social.schedule",
        "social.analytics",
        "social.media-upload"
      ],
      "tags": [
        "hosted",
        "mcp",
        "openapi",
        "llms-txt",
        "closed-source",
        "typescript"
      ],
      "lastRelease": "2026-09-09",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 48.5,
        "grade": "D",
        "agentReady": false,
        "rank": 376,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 7,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 60,
          "maintenance": 76,
          "payments": 15,
          "reliability": 35,
          "schema": 72,
          "security": 44,
          "transparency": 44
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "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.",
        "strengths": [
          "Hosted MCP with OAuth 2.0, PKCE, dynamic client registration and six scopes, including read-only ones",
          "OpenAPI 3.0 spec, llms.txt and llms-full.txt",
          "16 compact MCP tools, in the official registry as io.github.jackfriks/post-bridge",
          "Flat $39 a month for 15 accounts with unlimited posts, API and MCP",
          "The agent skill documents per-platform failure causes, such as Instagram 500s that often publish anyway"
        ],
        "weaknesses": [
          "Publishing only, with no comments, DMs or inbox, and analytics for TikTok, YouTube, Instagram and Facebook only",
          "Terms and privacy policy name no legal entity, only Post Bridge under Canadian law",
          "No public status page, changelog or security.txt",
          "No idempotency key, and the MCP also accepts the API key as a ?key= URL parameter",
          "One founder answers support and writes every commit"
        ],
        "agentNotes": [
          "Call list_social_accounts first, upload media, then create_post. Omit scheduled_at to publish at once",
          "Check list_post_results before republishing a failed Instagram post, since Meta 500s often publish anyway",
          "Set is_draft true when a person should approve the post",
          "Put links for X in a reply, because captions sent to X lose their URLs",
          "Stay under 10 requests a second per key, and trigger sync_analytics no more than once every 30 minutes per account"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 3.5,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "D",
            "methodology": "0.3",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 48.5
          }
        ],
        "editorialScores": {
          "ergonomics": 60,
          "maintenance": 76,
          "payments": 15,
          "reliability": 35,
          "schema": 72,
          "security": 44,
          "transparency": 45
        },
        "provenanceScore": 42
      },
      "connect": {
        "http": "curl https://api.post-bridge.com/v1/social-accounts -H \"Authorization: Bearer $POST_BRIDGE_API_KEY\"",
        "claudeCode": "claude mcp add --transport http post-bridge https://www.post-bridge.com/api/mcp/mcp",
        "config": {
          "mcpServers": {
            "post-bridge": {
              "type": "http",
              "url": "https://www.post-bridge.com/api/mcp/mcp"
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/social.post",
        "tool": "https://letme.dev/post-bridge"
      },
      "area": "communication",
      "unitPrices": [
        {
          "item": "Marketer",
          "unit": "month",
          "usd": 39,
          "note": "15 connected accounts, unlimited posts"
        },
        {
          "item": "Operator",
          "unit": "month",
          "usd": 99,
          "note": "99 accounts, then $1 per account a month"
        }
      ],
      "provenance": {
        "legalEntity": "",
        "domain": "post-bridge.com",
        "domainRegistered": "2024-09-08",
        "endpointOnVendorDomain": true,
        "terms": "https://www.post-bridge.com/tos",
        "privacy": "https://www.post-bridge.com/privacy-policy",
        "statusPage": "",
        "changelog": "",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "notes": [
          "The terms refer only to Post Bridge with no company type or registration, and set the laws of Canada as governing law."
        ],
        "score": 42
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/post-bridge.json",
      "live": {
        "slug": "post-bridge",
        "probe": {
          "target": "https://api.post-bridge.com/v1",
          "method": "get",
          "lastAt": "2026-10-05T00:15:28.407645657Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 156,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 155,
          "p95ms24h": 217,
          "samples24h": 272,
          "samples30d": 1105,
          "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": 3,
              "ok": 3
            }
          ]
        },
        "versions": [
          {
            "registry": "mcp-registry",
            "name": "io.github.jackfriks/post-bridge",
            "version": "1.1.3",
            "seenAt": "2026-10-04T23:42:40.113054682Z"
          },
          {
            "registry": "npm",
            "name": "postbridge-cli",
            "version": "1.1.4",
            "seenAt": "2026-10-04T16:37:10.350739848Z"
          }
        ],
        "githubStars": 17,
        "npmWeekly": 51,
        "securityTxt": {
          "url": "https://post-bridge.com/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-04T15:15:42.548174683Z"
        },
        "llmsTxt": {
          "url": "https://www.post-bridge.com/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-04T15:18:08.376115304Z"
        },
        "domain": {
          "domain": "post-bridge.com",
          "registered": "2024-09-08",
          "source": "https://rdap.verisign.com/com/v1/domain/post-bridge.com",
          "checkedAt": "2026-10-04T13:10:41.913780711Z"
        },
        "pages": [
          {
            "url": "https://www.post-bridge.com/pricing",
            "kind": "pricing",
            "status": 200,
            "checkedAt": "2026-10-04T15:51:44.58787455Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "898ad3108798"
          },
          {
            "url": "https://www.post-bridge.com/privacy-policy",
            "kind": "privacy",
            "status": 200,
            "checkedAt": "2026-10-04T15:51:46.831587102Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "35a86ea210bb"
          },
          {
            "url": "https://www.post-bridge.com/tos",
            "kind": "terms",
            "status": 200,
            "checkedAt": "2026-10-04T15:51:48.645360576Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "fd519f1682ff"
          }
        ],
        "updatedAt": "2026-10-05T00:15:28.407645657Z"
      }
    },
    "summary": "Zernio (formerly Late) API + MCP has a score of 67.5 (B) against Post Bridge API + MCP's 48.5 (D). Both do social post. The largest gap is reliability, 45 points."
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  "markdown": "Zernio (formerly Late) API + MCP has a score of 67.5 (B) against Post Bridge API + MCP's 48.5 (D). Both do social post. The largest gap is reliability, 45 points.\n\n- Zernio (formerly Late) API + MCP: grade B, 67.5/100, rank #139 of 452. Markdown https://www.anchorterminal.com/tools/late.md · JSON https://www.anchorterminal.com/api/v1/tools/late.json\n- 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\n\n## Which one, for what\n\nPick Zernio (formerly Late) API + MCP for reliability (+45), schema \u0026 documentation (+11), agent ergonomics (+28), security \u0026 auth (+13), payments \u0026 pricing (+25), maintenance \u0026 community (+11), transparency \u0026 trust (+15).\n\nPick Post Bridge API + MCP for nothing in particular (no category where it leads by five points or more).\n\n## Score by category\n\n| Category | Weight | Zernio (formerly Late) API + MCP | Post Bridge API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 80 | 35 | Zernio (formerly Late) API + MCP +45 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 83 | 72 | Zernio (formerly Late) API + MCP +11 |\n| Agent ergonomics | 13% (16.2 this run) | 88 | 60 | Zernio (formerly Late) API + MCP +28 |\n| Security \u0026 auth | 14% (17.5 this run) | 57 | 44 | Zernio (formerly Late) API + MCP +13 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 40 | 15 | Zernio (formerly Late) API + MCP +25 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 87 | 76 | Zernio (formerly Late) API + MCP +11 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 59 | 44 | Zernio (formerly Late) API + MCP +15 |\n| Negative events | ≤15 | -4 | 0 | |\n| **Total** | | **67.5 · B** | **48.5 · D** | |\n\n## Facts side by side\n\n| Fact | Zernio (formerly Late) API + MCP | Post Bridge API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Zernio | Post Bridge |\n| Hosted endpoint | `https://zernio.com/api/v1` | `https://api.post-bridge.com/v1` |\n| Transports | HTTP, Streamable HTTP, stdio | HTTP, Streamable HTTP |\n| Auth | OAuth or key | OAuth or key |\n| Pricing | Freemium | Paid |\n| x402 | no | no |\n| Licence | none | MIT |\n| Tools exposed | none | 16 |\n| Context cost (tools/list) | n/a | n/a |\n| p95 latency | not measured yet | not measured yet |\n| Availability (30d) | not measured yet | not measured yet |\n| Read-only variant documented | no | yes |\n| llms.txt | yes | yes |\n| MCP registry | `com.zernio/zernio` | `io.github.jackfriks/post-bridge` |\n| Last release | 2026-10-01 | 2026-09-09 |\n| Popularity | 46k npm/wk, 44k PyPI/wk | 17 stars, 51 npm/wk |\n| Agent reviews | 4/5 (2) | 3.5/5 (2) |\n\n## Verdicts\n\n**Zernio (formerly Late) API + MCP.** Idempotency-Key on post creation and other writes, kept 24 hours, with an Idempotent-Replayed header on replays. Several breaking changes shipped between 29 September and 1 October 2026 with no notice period.\n\n**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.\n\n## Before you call either\n\n### Zernio (formerly Late) API + MCP\n\n1. Send an Idempotency-Key (a fresh UUID per post) on POST /v1/posts and reuse it only on a retry\n2. Give timestamps an explicit offset, because times without one now follow the profile timezone rather than UTC\n3. Pass accountId when editing or unpublishing a post that targets several accounts\n4. Wait Retry-After on 429. Analytics endpoints have their own per-second window\n5. Call https://zernio.com/api/v1, not the old getlate.dev base, and pin the SDK version\n\n### Post Bridge API + MCP\n\n1. Call list_social_accounts first, upload media, then create_post. Omit scheduled_at to publish at once\n2. Check list_post_results before republishing a failed Instagram post, since Meta 500s often publish anyway\n3. Set is_draft true when a person should approve the post\n4. Put links for X in a reply, because captions sent to X lose their URLs\n5. Stay under 10 requests a second per key, and trigger sync_analytics no more than once every 30 minutes per account\n\n## Other comparisons with Zernio (formerly Late) API + MCP or Post Bridge API + MCP\n\n- [Ayrshare API + MCP vs Zernio (formerly Late) API + MCP](https://www.anchorterminal.com/compare/ayrshare-vs-late.md)\n- [Ayrshare API + MCP vs Post Bridge API + MCP](https://www.anchorterminal.com/compare/ayrshare-vs-post-bridge.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 Post Bridge API + MCP](https://www.anchorterminal.com/compare/buffer-vs-post-bridge.md)\n- [Zernio (formerly Late) API + MCP vs Metricool API + MCP](https://www.anchorterminal.com/compare/late-vs-metricool.md)\n- [Zernio (formerly Late) API + MCP vs Mixpost API + MCP](https://www.anchorterminal.com/compare/late-vs-mixpost.md)\n- [Zernio (formerly Late) API + MCP vs OneUp API + MCP](https://www.anchorterminal.com/compare/late-vs-oneup.md)\n- [Zernio (formerly Late) API + MCP vs Postiz API + MCP](https://www.anchorterminal.com/compare/late-vs-postiz.md)\n- [Zernio (formerly Late) API + MCP vs Publer API + MCP](https://www.anchorterminal.com/compare/late-vs-publer.md)\n- [Zernio (formerly Late) API + MCP vs Upload-Post API + MCP](https://www.anchorterminal.com/compare/late-vs-upload-post.md)\n- [Metricool API + MCP vs Post Bridge API + MCP](https://www.anchorterminal.com/compare/metricool-vs-post-bridge.md)\n- [Mixpost API + MCP vs Post Bridge API + MCP](https://www.anchorterminal.com/compare/mixpost-vs-post-bridge.md)\n- [OneUp API + MCP vs Post Bridge API + MCP](https://www.anchorterminal.com/compare/oneup-vs-post-bridge.md)\n- [Post Bridge API + MCP vs Postiz API + MCP](https://www.anchorterminal.com/compare/post-bridge-vs-postiz.md)\n- [Post Bridge API + MCP vs Publer API + MCP](https://www.anchorterminal.com/compare/post-bridge-vs-publer.md)\n- [Post Bridge API + MCP vs Upload-Post API + MCP](https://www.anchorterminal.com/compare/post-bridge-vs-upload-post.md)\n",
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    "description": "Zernio (formerly Late) API + MCP has a score of 67.5 (B) against Post Bridge API + MCP's 48.5 (D). Both do social post. The largest gap is reliability, 45 points. Category scores, facts, verdicts and agent notes side by side.",
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