{
  "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": "2026-10-05T02:29:57.780425382Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 148,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 59,
          "p95ms24h": 165,
          "samples24h": 273,
          "samples30d": 1131,
          "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": 29,
              "ok": 29
            }
          ]
        },
        "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": "2026-10-05T02:29:57.780425382Z"
      }
    },
    "b": {
      "slug": "oneup",
      "name": "OneUp API + MCP",
      "vendor": "OneUp",
      "vendorUrl": "https://www.oneupapp.io",
      "kind": "http-api",
      "category": "social-media",
      "summary": "Social scheduler with a JSON API and a hosted MCP server.",
      "url": "https://www.anchorterminal.com/tools/oneup",
      "markdownUrl": "https://www.anchorterminal.com/tools/oneup.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/oneup.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/oneup.json",
      "transports": [
        "http",
        "streamable-http"
      ],
      "remoteUrl": "https://www.oneupapp.io/api",
      "packages": [],
      "auth": "api-key",
      "authNotes": "One account API key passed as the apiKey query parameter on every call, including the hosted MCP URL. ChatGPT can connect over OAuth instead. Keys are generated and rotated at https://www.oneupapp.io/api-access.",
      "pricing": "paid",
      "pricingNotes": "No free plan, 7-day trial (we found no statement that it needs no card). Basic $25 a month ($15 billed yearly) for 5 social accounts and 300 scheduled posts, Intermediate $60 ($48) for 15, Growth $120 ($84) for 30, Business $300 ($240) for 80, each with unlimited posts. Extra accounts $5, $4, $3 and $1 a month on those plans. X capped at 2, 4, 8 and 10 accounts. API and MCP on every plan, but analytics and comment endpoints need Intermediate or above. Enterprise from $1,000 a month for 1,000 accounts (https://www.oneupapp.io/price).",
      "priceSummary": "$25 / mo",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402 or per-call payment in the docs or pricing (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": 50,
      "popularity": {
        "githubStars": null,
        "npmWeekly": null,
        "pypiWeekly": null,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://docs.oneupapp.io/docs/overview",
      "capabilities": [
        "social.post",
        "social.schedule",
        "social.analytics",
        "social.comments",
        "social.media-upload"
      ],
      "tags": [
        "hosted",
        "mcp",
        "closed-source",
        "whatsapp"
      ],
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 24.8,
        "grade": "F",
        "agentReady": false,
        "rank": 445,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 10,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 31,
          "maintenance": 43,
          "payments": 10,
          "reliability": 18,
          "schema": 27,
          "security": 17,
          "transparency": 43
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "API and MCP on every plan from $25 a month ($15 billed yearly). API key in the query string on REST and in the MCP URL, with no scopes.",
        "strengths": [
          "API and MCP on every plan from $25 a month ($15 billed yearly)",
          "Comments, analytics and a Facebook, Instagram and WhatsApp inbox as well as publishing",
          "Hosted MCP that returned 50 tools on 30 September 2026, plus an OAuth path for ChatGPT",
          "requireApproval and isDraftPost flags on post creation give a human review step",
          "11 changelog entries between July and September 2026"
        ],
        "weaknesses": [
          "API key in the query string on REST and in the MCP URL, with no scopes",
          "No OpenAPI spec, no llms.txt and no documented error responses",
          "No status page, no rate limits documented and no SLA",
          "Privacy policy names no subprocessors and has no DPA, and the terms allow discontinuing the service without notice",
          "Analytics and comment endpoints locked out of the Basic plan"
        ],
        "agentNotes": [
          "Call listcategory, then listcategoryaccount, then schedule. Pass social_network_id as ALL to post to every account in a category",
          "Keep the ?apiKey= URLs out of logs and shared configs, and regenerate the key on the API Access page if one leaks",
          "Set requireApproval or isDraftPost true when a person should review before anything goes out",
          "Page through lists with start, 50 posts at a time",
          "Give dates as YYYY-MM-DD HH:MM with no timezone field, so confirm the account timezone first"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 1.5,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "F",
            "methodology": "0.3",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 24.8
          }
        ],
        "editorialScores": {
          "ergonomics": 31,
          "maintenance": 43,
          "payments": 10,
          "reliability": 18,
          "schema": 27,
          "security": 17,
          "transparency": 20
        },
        "provenanceScore": 65
      },
      "connect": {
        "http": "curl \"https://www.oneupapp.io/api/listcategory?apiKey=$ONEUP_API_KEY\"",
        "claudeCode": "claude mcp add --transport http oneup \"https://feed.oneupapp.io/mcp/oneup?apiKey=$ONEUP_API_KEY\""
      },
      "letme": {
        "capability": "https://letme.dev/social.post",
        "tool": "https://letme.dev/oneup"
      },
      "area": "communication",
      "unitPrices": [
        {
          "item": "Basic",
          "unit": "month",
          "usd": 25,
          "note": "5 social accounts, no analytics or comment endpoints. $15 a month billed yearly"
        },
        {
          "item": "Intermediate",
          "unit": "month",
          "usd": 60,
          "note": "15 social accounts. $48 a month billed yearly"
        },
        {
          "item": "Growth",
          "unit": "month",
          "usd": 120,
          "note": "30 social accounts. $84 a month billed yearly"
        },
        {
          "item": "Business",
          "unit": "month",
          "usd": 300,
          "note": "80 social accounts. $240 a month billed yearly"
        }
      ],
      "provenance": {
        "legalEntity": "OneUp, Inc.",
        "domain": "oneupapp.io",
        "domainRegistered": "",
        "endpointOnVendorDomain": true,
        "terms": "https://www.oneupapp.io/terms",
        "privacy": "https://www.oneupapp.io/privacy",
        "statusPage": "",
        "changelog": "https://help.oneupapp.io/en-us/article/oneup-roadmap-product-updates-changelog-new-features-and-feature-requests-1vs2exx/",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "notes": [
          "The terms name OneUp, Inc. of Cranberry Township, Pennsylvania.",
          "rdap.org has no RDAP service for .io, so the registration date is unread."
        ],
        "score": 65
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/oneup.json",
      "live": {
        "slug": "oneup",
        "probe": {
          "target": "https://www.oneupapp.io/api",
          "method": "get",
          "lastAt": "2026-10-05T02:29:59.639882672Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 425,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 430,
          "p95ms24h": 548,
          "samples24h": 273,
          "samples30d": 1131,
          "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": 29,
              "ok": 29
            }
          ]
        },
        "securityTxt": {
          "url": "https://oneupapp.io/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-04T15:15:47.612691288Z"
        },
        "domain": {
          "domain": "oneupapp.io",
          "checkedAt": "2026-10-04T13:08:59.683602304Z"
        },
        "pages": [
          {
            "url": "https://help.oneupapp.io/en-us/article/oneup-roadmap-product-updates-changelog-new-features-and-feature-requests-1vs2exx/",
            "kind": "changelog",
            "status": 304,
            "checkedAt": "2026-10-04T15:45:01.803566182Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "b553ba5989db"
          },
          {
            "url": "https://www.oneupapp.io/price",
            "kind": "pricing",
            "status": 200,
            "checkedAt": "2026-10-04T15:51:32.194969918Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "cb0715990a3a"
          },
          {
            "url": "https://www.oneupapp.io/privacy",
            "kind": "privacy",
            "status": 200,
            "checkedAt": "2026-10-04T15:51:34.538754339Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "468de880fd8b"
          },
          {
            "url": "https://www.oneupapp.io/terms",
            "kind": "terms",
            "status": 200,
            "checkedAt": "2026-10-04T15:51:36.316979558Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "17739acb09c7"
          }
        ],
        "updatedAt": "2026-10-05T02:29:59.639882672Z"
      }
    },
    "summary": "Zernio (formerly Late) API + MCP has a score of 67.5 (B) against OneUp API + MCP's 24.8 (F). Both do social post. The largest gap is reliability, 62 points."
  },
  "kind": "anchor.page",
  "links": {
    "api": "https://www.anchorterminal.com/api/v1/index.json",
    "html": "https://www.anchorterminal.com/compare/late-vs-oneup",
    "json": "https://www.anchorterminal.com/compare/late-vs-oneup.json",
    "llms": "https://www.anchorterminal.com/llms.txt",
    "markdown": "https://www.anchorterminal.com/compare/late-vs-oneup.md",
    "slim": "https://www.anchorterminal.com/compare/late-vs-oneup.min.md"
  },
  "markdown": "Zernio (formerly Late) API + MCP has a score of 67.5 (B) against OneUp API + MCP's 24.8 (F). Both do social post. The largest gap is reliability, 62 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- OneUp API + MCP: grade F, 24.8/100, rank #445 of 452. Markdown https://www.anchorterminal.com/tools/oneup.md · JSON https://www.anchorterminal.com/api/v1/tools/oneup.json\n\n## Which one, for what\n\nPick Zernio (formerly Late) API + MCP for reliability (+62), schema \u0026 documentation (+56), agent ergonomics (+57), security \u0026 auth (+40), payments \u0026 pricing (+30), maintenance \u0026 community (+44), transparency \u0026 trust (+16).\n\nPick OneUp 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 | OneUp API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 80 | 18 | Zernio (formerly Late) API + MCP +62 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 83 | 27 | Zernio (formerly Late) API + MCP +56 |\n| Agent ergonomics | 13% (16.2 this run) | 88 | 31 | Zernio (formerly Late) API + MCP +57 |\n| Security \u0026 auth | 14% (17.5 this run) | 57 | 17 | Zernio (formerly Late) API + MCP +40 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 40 | 10 | Zernio (formerly Late) API + MCP +30 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 87 | 43 | Zernio (formerly Late) API + MCP +44 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 59 | 43 | Zernio (formerly Late) API + MCP +16 |\n| Negative events | ≤15 | -4 | 0 | |\n| **Total** | | **67.5 · B** | **24.8 · F** | |\n\n## Facts side by side\n\n| Fact | Zernio (formerly Late) API + MCP | OneUp API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Zernio | OneUp |\n| Hosted endpoint | `https://zernio.com/api/v1` | `https://www.oneupapp.io/api` |\n| Transports | HTTP, Streamable HTTP, stdio | HTTP, Streamable HTTP |\n| Auth | OAuth or key | API key |\n| Pricing | Freemium | Paid |\n| x402 | no | no |\n| Licence | none | none |\n| Tools exposed | none | 50 |\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 | no |\n| MCP registry | `com.zernio/zernio` | not listed |\n| Last release | 2026-10-01 | none |\n| Popularity | 46k npm/wk, 44k PyPI/wk | none |\n| Agent reviews | 4/5 (2) | 1.5/5 (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**OneUp API + MCP.** API and MCP on every plan from $25 a month ($15 billed yearly). API key in the query string on REST and in the MCP URL, with no scopes.\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### OneUp API + MCP\n\n1. Call listcategory, then listcategoryaccount, then schedule. Pass social_network_id as ALL to post to every account in a category\n2. Keep the ?apiKey= URLs out of logs and shared configs, and regenerate the key on the API Access page if one leaks\n3. Set requireApproval or isDraftPost true when a person should review before anything goes out\n4. Page through lists with start, 50 posts at a time\n5. Give dates as YYYY-MM-DD HH:MM with no timezone field, so confirm the account timezone first\n\n## Other comparisons with Zernio (formerly Late) API + MCP or OneUp 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 OneUp API + MCP](https://www.anchorterminal.com/compare/ayrshare-vs-oneup.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 OneUp API + MCP](https://www.anchorterminal.com/compare/buffer-vs-oneup.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 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 OneUp API + MCP](https://www.anchorterminal.com/compare/metricool-vs-oneup.md)\n- [Mixpost API + MCP vs OneUp API + MCP](https://www.anchorterminal.com/compare/mixpost-vs-oneup.md)\n- [OneUp API + MCP vs Post Bridge API + MCP](https://www.anchorterminal.com/compare/oneup-vs-post-bridge.md)\n- [OneUp API + MCP vs Postiz API + MCP](https://www.anchorterminal.com/compare/oneup-vs-postiz.md)\n- [OneUp API + MCP vs Publer API + MCP](https://www.anchorterminal.com/compare/oneup-vs-publer.md)\n- [OneUp API + MCP vs Upload-Post API + MCP](https://www.anchorterminal.com/compare/oneup-vs-upload-post.md)\n",
  "meta": {
    "attribution": "Anchor Terminal (https://www.anchorterminal.com)",
    "docs": "https://www.anchorterminal.com/docs/",
    "generatedAt": "2026-10-05",
    "license": "CC-BY-4.0",
    "method": "https://www.anchorterminal.com/benchmark/",
    "methodology": "0.3",
    "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": "Zernio (formerly Late) API + MCP vs OneUp API + MCP",
        "url": ""
      }
    ],
    "description": "Zernio (formerly Late) API + MCP has a score of 67.5 (B) against OneUp API + MCP's 24.8 (F). Both do social post. The largest gap is reliability, 62 points. Category scores, facts, verdicts and agent notes side by side.",
    "facts": [
      "Zernio (formerly Late) API + MCP B 67.5",
      "OneUp API + MCP F 24.8",
      "scores"
    ],
    "h1": "Zernio (formerly Late) API + MCP vs OneUp API + MCP",
    "image": "https://www.anchorterminal.com/assets/og/compare-late-vs-oneup.png",
    "path": "/compare/late-vs-oneup",
    "published": "2026-10-01",
    "section": "tools",
    "title": "Zernio (formerly Late) API + MCP vs OneUp API + MCP for AI agents",
    "toc": null,
    "updated": "2026-10-05",
    "url": "https://www.anchorterminal.com/compare/late-vs-oneup"
  },
  "tokens": {
    "markdown": 1700,
    "slim": 380
  },
  "version": 1
}