{
  "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": "2026-10-05T00:57:22.683743811Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 45,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 59,
          "p95ms24h": 169,
          "samples24h": 272,
          "samples30d": 1113,
          "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": 11,
              "ok": 11
            }
          ]
        },
        "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": "2026-10-05T00:57:22.683743811Z"
      }
    },
    "b": {
      "slug": "metricool",
      "name": "Metricool API + MCP",
      "vendor": "Metricool",
      "vendorUrl": "https://metricool.com",
      "kind": "http-api",
      "category": "social-media",
      "summary": "Analytics-first social suite with a large REST API (553 paths) and a hosted OAuth MCP server.",
      "url": "https://www.anchorterminal.com/tools/metricool",
      "markdownUrl": "https://www.anchorterminal.com/tools/metricool.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/metricool.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/metricool.json",
      "transports": [
        "http",
        "streamable-http"
      ],
      "remoteUrl": "https://app.metricool.com/api",
      "packages": [
        {
          "registry": "pypi",
          "name": "mcp-metricool"
        }
      ],
      "auth": "mixed",
      "authNotes": "REST API takes the account token in the X-Mc-Auth header plus userId and blogId parameters on every call. The hosted MCP uses OAuth. The older local PyPI server reads METRICOOL_USER_TOKEN and METRICOOL_USER_ID and needs API access.",
      "pricing": "freemium",
      "pricingNotes": "Free plan for 1 brand with 20 scheduled posts, 30 days of analytics and the MCP, no LinkedIn or X. Starter $25 a month for 5 brands or $45 for 10 ($20 and $36 billed yearly). REST API only on Advanced, $67 a month for 15 brands, $107 for 25, $210 for 50 ($53, $85 and $159 billed yearly). X accounts $10 a month each on top. Euro prices differ (https://metricool.com/pricing/).",
      "priceSummary": "$25 / mo",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402 or per-call payment in the API docs, help centre or pricing (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": null,
        "npmWeekly": null,
        "pypiWeekly": 424,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://app.metricool.com/resources/apidocs/index.html",
      "llmsTxt": "https://help.metricool.com/llms.txt",
      "openapi": "https://app.metricool.com/api/swagger.json",
      "capabilities": [
        "social.post",
        "social.schedule",
        "social.analytics",
        "social.media-upload"
      ],
      "tags": [
        "hosted",
        "freemium",
        "free-tier",
        "mcp",
        "openapi",
        "llms-txt",
        "python",
        "closed-source"
      ],
      "lastRelease": "2025-10-07",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 38.7,
        "grade": "E",
        "agentReady": false,
        "rank": 428,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 9,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 39,
          "maintenance": 6,
          "payments": 30,
          "reliability": 35,
          "schema": 56,
          "security": 48,
          "transparency": 64
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "low",
          "date": "2026-10-01"
        },
        "negative": -2,
        "negativeNotes": [
          "2026-10-01. The help centre says the Metricool MCP server is public at metricool/mcp-metricool on GitHub. That repo returned 404 on 30 September and asked for credentials on 1 and 2 October, and the metricool organisation page lists one public repository, a fork of modelcontextprotocol/servers. The open-source claim doesn't hold for readers. -2 (https://help.metricool.com/faqs-about-the-metricool-mcp-1i3w0, https://github.com/metricool)"
        ],
        "verdict": "Hosted MCP with OAuth and separate mcp:read and mcp:write scopes, on every plan including Free. REST API only on Advanced ($67 a month) and Custom.",
        "strengths": [
          "Hosted MCP with OAuth and separate mcp:read and mcp:write scopes, on every plan including Free",
          "Six hosted MCP tools per the help centre, four that read and two that write",
          "OpenAPI spec covering 553 paths, per the 30 September check",
          "Analytics across organic networks and Meta, Google and TikTok ad accounts, with all data on EU servers per the privacy policy",
          "The REST token can be regenerated in settings, which cuts off the old one at once"
        ],
        "weaknesses": [
          "REST API only on Advanced ($67 a month) and Custom",
          "No published rate limits, 429 guidance or API changelog",
          "Three values on every REST call (the X-Mc-Auth token, userId and blogId)",
          "PyPI MCP package still at 1.1.9 from 7 October 2025, and the GitHub repo the help centre names isn't public",
          "No security disclosure route or certification found"
        ],
        "agentNotes": [
          "Connect the hosted MCP at https://ai.metricool.com/mcp with OAuth, and ask only for mcp:read when the job is reporting",
          "Call admin/simpleProfiles with your userId to list brands and their blogId values",
          "Normalise media through `actions/normalize/image/url` first, or the post goes out without it",
          "Give publicationDate a dateTime and an IANA timezone, in the future",
          "Back off on your own, since no rate limits or Retry-After are documented"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 2.5,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "low",
            "grade": "E",
            "methodology": "0.3",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 38.7
          }
        ],
        "editorialScores": {
          "ergonomics": 39,
          "maintenance": 6,
          "payments": 30,
          "reliability": 35,
          "schema": 56,
          "security": 48,
          "transparency": 47
        },
        "provenanceScore": 80
      },
      "connect": {
        "http": "curl \"https://app.metricool.com/api/admin/simpleProfiles?userId=$METRICOOL_USER_ID\" -H \"X-Mc-Auth: $METRICOOL_API_TOKEN\"",
        "claudeCode": "claude mcp add --transport http metricool https://ai.metricool.com/mcp",
        "config": {
          "mcpServers": {
            "metricool": {
              "type": "http",
              "url": "https://ai.metricool.com/mcp"
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/social.post",
        "tool": "https://letme.dev/metricool"
      },
      "area": "communication",
      "unitPrices": [
        {
          "item": "Starter",
          "unit": "month",
          "usd": 25,
          "note": "5 brands, no REST API. $20 a month billed yearly"
        },
        {
          "item": "Advanced",
          "unit": "month",
          "usd": 67,
          "note": "15 brands, cheapest plan with the REST API. $53 a month billed yearly"
        },
        {
          "item": "Advanced 25",
          "unit": "month",
          "usd": 107,
          "note": "25 brands. $85 a month billed yearly"
        },
        {
          "item": "Advanced 50",
          "unit": "month",
          "usd": 210,
          "note": "50 brands. $159 a month billed yearly"
        }
      ],
      "provenance": {
        "legalEntity": "METRICOOL SOFTWARE, SL",
        "domain": "metricool.com",
        "domainRegistered": "2015-04-04",
        "endpointOnVendorDomain": true,
        "terms": "https://metricool.com/legal-terms/",
        "privacy": "https://metricool.com/privacy-policy/",
        "statusPage": "https://status.metricool.com/",
        "changelog": "",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "notes": [
          "The terms name METRICOOL SOFTWARE, SL of Madrid, NIF B87527115."
        ],
        "score": 80
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/metricool.json",
      "live": {
        "slug": "metricool",
        "probe": {
          "target": "https://app.metricool.com/api",
          "method": "get",
          "lastAt": "2026-10-05T00:57:23.803787047Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 64,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 65,
          "p95ms24h": 145,
          "samples24h": 272,
          "samples30d": 1113,
          "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": 11,
              "ok": 11
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.metricool.com",
          "indicator": "unknown",
          "summary": "no machine-readable status found",
          "checkedAt": "2026-10-04T21:40:14.962846908Z"
        },
        "versions": [
          {
            "registry": "pypi",
            "name": "mcp-metricool",
            "version": "1.1.9",
            "released": "2025-10-07",
            "seenAt": "2026-10-04T16:33:00.287332453Z"
          }
        ],
        "pypiWeekly": 583,
        "securityTxt": {
          "url": "https://metricool.com/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-04T15:15:53.462817982Z"
        },
        "llmsTxt": {
          "url": "https://help.metricool.com/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-04T15:17:58.757370106Z"
        },
        "domain": {
          "domain": "metricool.com",
          "registered": "2015-04-04",
          "source": "https://rdap.verisign.com/com/v1/domain/metricool.com",
          "checkedAt": "2026-10-04T13:09:19.936087655Z"
        },
        "pages": [
          {
            "url": "https://metricool.com/pricing/",
            "kind": "pricing",
            "status": 200,
            "checkedAt": "2026-10-04T15:45:59.734196501Z",
            "changedAt": "2026-10-02T15:22:17.685611431Z",
            "fingerprint": "a72178d7d52d"
          },
          {
            "url": "https://metricool.com/privacy-policy/",
            "kind": "privacy",
            "status": 200,
            "checkedAt": "2026-10-04T15:46:01.793960013Z",
            "changedAt": "2026-10-02T15:22:19.748357966Z",
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            "kind": "terms",
            "status": 200,
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            "changedAt": "2026-10-02T15:22:15.606991596Z",
            "fingerprint": "38dfde56abc0"
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      }
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    "summary": "Zernio (formerly Late) API + MCP has a score of 67.5 (B) against Metricool API + MCP's 38.7 (E). Both do social post. The largest gap is maintenance \u0026 community, 81 points."
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  "markdown": "Zernio (formerly Late) API + MCP has a score of 67.5 (B) against Metricool API + MCP's 38.7 (E). Both do social post. The largest gap is maintenance \u0026 community, 81 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- Metricool API + MCP: grade E, 38.7/100, rank #428 of 452. Markdown https://www.anchorterminal.com/tools/metricool.md · JSON https://www.anchorterminal.com/api/v1/tools/metricool.json\n\n## Which one, for what\n\nPick Zernio (formerly Late) API + MCP for reliability (+45), schema \u0026 documentation (+27), agent ergonomics (+49), security \u0026 auth (+9), payments \u0026 pricing (+10), maintenance \u0026 community (+81).\n\nPick Metricool API + MCP for transparency \u0026 trust (+5).\n\n## Score by category\n\n| Category | Weight | Zernio (formerly Late) API + MCP | Metricool 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 | 56 | Zernio (formerly Late) API + MCP +27 |\n| Agent ergonomics | 13% (16.2 this run) | 88 | 39 | Zernio (formerly Late) API + MCP +49 |\n| Security \u0026 auth | 14% (17.5 this run) | 57 | 48 | Zernio (formerly Late) API + MCP +9 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 40 | 30 | Zernio (formerly Late) API + MCP +10 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 87 | 6 | Zernio (formerly Late) API + MCP +81 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 59 | 64 | Metricool API + MCP +5 |\n| Negative events | ≤15 | -4 | -2 | |\n| **Total** | | **67.5 · B** | **38.7 · E** | |\n\n## Facts side by side\n\n| Fact | Zernio (formerly Late) API + MCP | Metricool API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Zernio | Metricool |\n| Hosted endpoint | `https://zernio.com/api/v1` | `https://app.metricool.com/api` |\n| Transports | HTTP, Streamable HTTP, stdio | HTTP, Streamable HTTP |\n| Auth | OAuth or key | OAuth or key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | none | none |\n| Tools exposed | none | none |\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 | no |\n| llms.txt | yes | yes |\n| MCP registry | `com.zernio/zernio` | not listed |\n| Last release | 2026-10-01 | 2025-10-07 |\n| Popularity | 46k npm/wk, 44k PyPI/wk | 424 PyPI/wk |\n| Agent reviews | 4/5 (2) | 2.5/5 (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**Metricool API + MCP.** Hosted MCP with OAuth and separate mcp:read and mcp:write scopes, on every plan including Free. REST API only on Advanced ($67 a month) and Custom.\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### Metricool API + MCP\n\n1. Connect the hosted MCP at https://ai.metricool.com/mcp with OAuth, and ask only for mcp:read when the job is reporting\n2. Call admin/simpleProfiles with your userId to list brands and their blogId values\n3. Normalise media through `actions/normalize/image/url` first, or the post goes out without it\n4. Give publicationDate a dateTime and an IANA timezone, in the future\n5. Back off on your own, since no rate limits or Retry-After are documented\n\n## Other comparisons with Zernio (formerly Late) API + MCP or Metricool 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 Metricool API + MCP](https://www.anchorterminal.com/compare/ayrshare-vs-metricool.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- [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 Post Bridge API + MCP](https://www.anchorterminal.com/compare/late-vs-post-bridge.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 Mixpost API + MCP](https://www.anchorterminal.com/compare/metricool-vs-mixpost.md)\n- [Metricool API + MCP vs OneUp API + MCP](https://www.anchorterminal.com/compare/metricool-vs-oneup.md)\n- [Metricool API + MCP vs Post Bridge API + MCP](https://www.anchorterminal.com/compare/metricool-vs-post-bridge.md)\n- [Metricool API + MCP vs Postiz API + MCP](https://www.anchorterminal.com/compare/metricool-vs-postiz.md)\n- [Metricool API + MCP vs Publer API + MCP](https://www.anchorterminal.com/compare/metricool-vs-publer.md)\n- [Metricool API + MCP vs Upload-Post API + MCP](https://www.anchorterminal.com/compare/metricool-vs-upload-post.md)\n",
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        "name": "Zernio (formerly Late) API + MCP vs Metricool API + MCP",
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    "description": "Zernio (formerly Late) API + MCP has a score of 67.5 (B) against Metricool API + MCP's 38.7 (E). Both do social post. The largest gap is maintenance \u0026 community, 81 points. Category scores, facts, verdicts and agent notes side by side.",
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      "Metricool API + MCP E 38.7",
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    "title": "Zernio (formerly Late) API + MCP vs Metricool API + MCP for AI agents",
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