{
  "data": {
    "a": {
      "slug": "langfuse",
      "name": "Langfuse API + MCP",
      "vendor": "Langfuse (ClickHouse)",
      "vendorUrl": "https://langfuse.com",
      "kind": "http-api",
      "category": "agent-observability",
      "summary": "Open-source tracing, evaluation, prompt management and datasets for LLM apps and agents, built on OpenTelemetry.",
      "url": "https://www.anchorterminal.com/tools/langfuse",
      "markdownUrl": "https://www.anchorterminal.com/tools/langfuse.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/langfuse.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/langfuse.json",
      "repo": "https://github.com/langfuse/langfuse",
      "license": "MIT (core), commercial licence for the ee directories",
      "transports": [
        "http",
        "streamable-http"
      ],
      "remoteUrl": "https://cloud.langfuse.com/api/public",
      "packages": [
        {
          "registry": "pypi",
          "name": "langfuse"
        },
        {
          "registry": "npm",
          "name": "@langfuse/tracing"
        },
        {
          "registry": "npm",
          "name": "@langfuse/client"
        }
      ],
      "auth": "api-key",
      "authNotes": "Project-scoped key pair (public `pk-lf-...`, secret `sk-lf-...`) sent as HTTP Basic auth, for both the REST API and the MCP server at `/api/public/mcp`. Organisation-level keys exist for SCIM and admin APIs on Enterprise.",
      "pricing": "freemium",
      "pricingNotes": "Cloud Hobby is free with 50,000 units a month, 30 days of data and 2 users, no card. Core $29 a month with 100,000 units and 90 days, Pro $199 a month with 3 years of data, Enterprise $2,499 a month. Extra units cost $8 per 100,000 on paid plans, lower with volume. A unit is one trace, observation or score. Teams add-on $300 a month for SSO and fine-grained RBAC. Self-hosted open source is free with unlimited usage, you pay for your own Postgres, ClickHouse, Redis and blob storage. Self-hosted Enterprise is custom and sold on top of a ClickHouse plan (https://langfuse.com/pricing).",
      "priceSummary": "$29 / mo",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402 support in docs or pricing (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": 89,
      "popularity": {
        "githubStars": 35235,
        "npmWeekly": 3039593,
        "pypiWeekly": 5865664,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://langfuse.com/docs",
      "llmsTxt": "https://langfuse.com/llms.txt",
      "openapi": "https://cloud.langfuse.com/generated/api/openapi.yml",
      "capabilities": [
        "obs.traces",
        "obs.evals",
        "obs.prompts",
        "obs.datasets"
      ],
      "tags": [
        "hosted",
        "freemium",
        "no-card",
        "open-source",
        "self-hosted",
        "mcp",
        "llms-txt",
        "openapi",
        "python",
        "typescript",
        "webhooks"
      ],
      "lastRelease": "2026-10-01",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 72.7,
        "grade": "BB",
        "agentReady": true,
        "rank": 98,
        "ranked": true,
        "rankOf": 842,
        "categoryRank": 2,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 74,
          "maintenance": 88,
          "payments": 40,
          "reliability": 80,
          "schema": 93,
          "security": 65,
          "transparency": 85
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "high",
          "date": "2026-10-01"
        },
        "negative": -2,
        "negativeNotes": [
          "2025-11-09 to 2026-01-21. Three moderate advisories, cross-organisation enumeration of member and invitation lists (GHSA-94hf-6gqq-pj69), SSO account takeover through CSRF or phishing (GHSA-w9pw-c549-5m6w) and an unauthenticated Slack OAuth install that could link Slack to any project (GHSA-pvq7-vvfj-p98x). All fixed and published, eight to eleven months old, so -2 (https://github.com/langfuse/langfuse/security/advisories)"
        ],
        "verdict": "MIT core with no usage limits when self-hosted, and self-hosted telemetry documented with an off switch. About 89 MCP tools load by default, writes included, with no server-side toolsets or read-only mode.",
        "bestFor": "Teams that want open source they can self-host or a predictable cloud bill, across tracing, evals, prompts and datasets.",
        "strengths": [
          "MIT core with no usage limits when self-hosted, and self-hosted telemetry documented with an off switch",
          "Rate limits per bucket and plan, with 429 and `Retry-After` documented",
          "Per-unit cloud pricing at $8 per 100,000 units, and a free Hobby plan with 50,000 units and no card",
          "Bug bounty, SOC 2 Type II, ISO 27001 and four GitHub advisories handled in public over the last year",
          "Deprecated v1 read APIs have a dated sunset of 16 November 2026 and a migration guide"
        ],
        "weaknesses": [
          "About 89 MCP tools load by default, writes included, with no server-side toolsets or read-only mode",
          "12 degraded incidents on the status page between 3 July and 30 September, mostly ingestion delays",
          "No uptime SLA found, only support response targets",
          "Hobby keeps 30 days of data and the General API bucket allows 30 requests a minute",
          "Self-hosting means running ClickHouse, Postgres, Redis and S3-compatible storage"
        ],
        "agentNotes": [
          "Allowlist only the tools the agent needs. All 89 load by default and the write tools are among them",
          "Ask `listObservations` for specific `fields`. Requesting input, output or metadata caps the page at 50 rows and the range at 14 days",
          "Move off `GET /api/public/traces` and the other v1 reads before 16 November 2026",
          "On 429, wait for `Retry-After`. MCP calls share the organisation's General API bucket",
          "Pick the regional host (cloud, us.cloud, jp.cloud, hipaa.cloud) that matches the project's keys"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 4,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "high",
            "grade": "BB",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 72.7
          }
        ],
        "editorialScores": {
          "ergonomics": 74,
          "maintenance": 88,
          "payments": 40,
          "reliability": 80,
          "schema": 93,
          "security": 65,
          "transparency": 91
        },
        "provenanceScore": 78
      },
      "connect": {
        "http": "curl -u \"$LANGFUSE_PUBLIC_KEY:$LANGFUSE_SECRET_KEY\" https://cloud.langfuse.com/api/public/projects",
        "claudeCode": "claude mcp add --transport http langfuse https://cloud.langfuse.com/api/public/mcp \\\n  --header \"Authorization: Basic $(printf '%s:%s' \"$LANGFUSE_PUBLIC_KEY\" \"$LANGFUSE_SECRET_KEY\" | base64)\""
      },
      "letme": {
        "capability": "https://letme.dev/obs.traces",
        "tool": "https://letme.dev/langfuse"
      },
      "area": "developer",
      "unitPrices": [
        {
          "item": "Core plan",
          "unit": "month",
          "usd": 29,
          "note": "100,000 units included, 90 days of data"
        },
        {
          "item": "Pro plan",
          "unit": "month",
          "usd": 199,
          "note": "100,000 units included, 3 years of data"
        },
        {
          "item": "Enterprise plan",
          "unit": "month",
          "usd": 2499,
          "note": "100,000 units included, audit logs, SCIM, SLAs"
        },
        {
          "item": "Teams add-on",
          "unit": "month",
          "usd": 300,
          "note": "SSO, SSO enforcement and fine-grained RBAC on Pro"
        }
      ],
      "provenance": {
        "legalEntity": "Langfuse GmbH (a ClickHouse, Inc. company)",
        "domain": "langfuse.com",
        "domainRegistered": "2023-04-20",
        "endpointOnVendorDomain": true,
        "terms": "https://clickhouse.com/legal/clickhouse-general-terms-and-conditions",
        "privacy": "https://langfuse.com/privacy",
        "statusPage": "https://status.langfuse.com",
        "changelog": "https://langfuse.com/changelog",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "notes": [
          "The imprint names Langfuse GmbH in Berlin. The privacy notice is issued by ClickHouse, Inc. and langfuse.com/terms redirects to the ClickHouse general terms"
        ],
        "score": 78
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/langfuse.json",
      "live": {
        "slug": "langfuse",
        "probe": {
          "target": "https://cloud.langfuse.com/api/public",
          "method": "get",
          "lastAt": "2026-10-09T09:26:54.542083933Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 134,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 53,
          "p95ms24h": 83,
          "samples24h": 261,
          "samples30d": 2287,
          "days": [
            {
              "date": "2026-09-30",
              "probes": 35,
              "ok": 35
            },
            {
              "date": "2026-10-01",
              "probes": 276,
              "ok": 276
            },
            {
              "date": "2026-10-02",
              "probes": 248,
              "ok": 248
            },
            {
              "date": "2026-10-03",
              "probes": 271,
              "ok": 271
            },
            {
              "date": "2026-10-04",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-05",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-06",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-07",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-08",
              "probes": 268,
              "ok": 268
            },
            {
              "date": "2026-10-09",
              "probes": 101,
              "ok": 101
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.langfuse.com",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-09T09:25:17.132289654Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "langfuse/langfuse",
            "version": "v4.55.0",
            "released": "2026-10-08",
            "seenAt": "2026-10-08T16:18:24.588520565Z"
          },
          {
            "registry": "npm",
            "name": "@langfuse/client",
            "version": "5.13.1",
            "seenAt": "2026-10-08T16:18:22.622711734Z"
          },
          {
            "registry": "npm",
            "name": "@langfuse/tracing",
            "version": "5.13.1",
            "seenAt": "2026-10-08T16:18:21.541544154Z"
          },
          {
            "registry": "pypi",
            "name": "langfuse",
            "version": "4.17.0",
            "released": "2026-10-05",
            "seenAt": "2026-10-08T16:18:21.419024323Z"
          }
        ],
        "githubStars": 35528,
        "npmWeekly": 3268181,
        "pypiWeekly": 6331716,
        "securityTxt": {
          "url": "https://langfuse.com/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-08T15:38:35.306691262Z"
        },
        "llmsTxt": {
          "url": "https://langfuse.com/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-08T14:00:33.869864319Z"
        },
        "domain": {
          "domain": "langfuse.com",
          "registered": "2023-04-20",
          "source": "https://rdap.verisign.com/com/v1/domain/langfuse.com",
          "checkedAt": "2026-10-04T13:09:17.712369699Z"
        },
        "pages": [
          {
            "url": "https://langfuse.com/changelog",
            "kind": "changelog",
            "status": 404,
            "checkedAt": "2026-10-08T18:21:16.807292557Z",
            "changedAt": "0001-01-01T00:00:00Z"
          },
          {
            "url": "https://langfuse.com/blog/joining-clickhouse",
            "kind": "deprecations",
            "status": 304,
            "checkedAt": "2026-10-08T18:21:14.604548394Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "4e8ff98bb557"
          },
          {
            "url": "https://langfuse.com/pricing",
            "kind": "pricing",
            "status": 304,
            "checkedAt": "2026-10-08T18:21:18.752448188Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "fa6797a4f9e7"
          },
          {
            "url": "https://langfuse.com/privacy",
            "kind": "privacy",
            "status": 304,
            "checkedAt": "2026-10-08T18:21:20.652067587Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "9e1e582ef9a9"
          },
          {
            "url": "https://clickhouse.com/legal/clickhouse-general-terms-and-conditions",
            "kind": "terms",
            "status": 200,
            "checkedAt": "2026-10-08T18:16:08.788877158Z",
            "changedAt": "2026-10-06T16:06:19.636505735Z",
            "fingerprint": "1be14feaa85c"
          }
        ],
        "updatedAt": "2026-10-09T09:26:54.542083933Z"
      }
    },
    "answer": "Langfuse API + MCP scores 72.7 (BB) on agent readiness against LangWatch's 65.5 (B), and leads in 4 of 7 scored categories. LangWatch leads on security \u0026 auth.",
    "b": {
      "slug": "langwatch",
      "name": "LangWatch",
      "vendor": "Reasoning Engine B.V. (LangWatch)",
      "vendorUrl": "https://langwatch.ai",
      "kind": "http-api",
      "category": "agent-observability",
      "summary": "LangWatch is an open-source platform for tracing, evaluating and testing LLM applications and agents, with prompt management, datasets and an AI gateway. It runs hosted or self-hosted, with a REST API, SDKs, a CLI and an MCP server.",
      "url": "https://www.anchorterminal.com/tools/langwatch",
      "markdownUrl": "https://www.anchorterminal.com/tools/langwatch.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/langwatch.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/langwatch.json",
      "repo": "https://github.com/langwatch/langwatch",
      "license": "Apache 2.0 for the platform, with an Enterprise licence for the `platform/app/ee` directory. The SDKs and the MCP server are MIT",
      "transports": [
        "http",
        "streamable-http",
        "sse",
        "stdio"
      ],
      "remoteUrl": "https://app.langwatch.ai",
      "packages": [
        {
          "registry": "npm",
          "name": "langwatch"
        },
        {
          "registry": "npm",
          "name": "@langwatch/mcp-server"
        },
        {
          "registry": "pypi",
          "name": "langwatch"
        }
      ],
      "auth": "mixed",
      "authNotes": "A person signs up at app.langwatch.ai and creates keys under Settings, API Keys, with no review step. API keys (`sk-lw-`) go in `X-Auth-Token` or as a Bearer token. A personal key never exceeds its owner's permissions, a service key belongs to the organisation and only admins create one. Either can be All or Restricted to read or write per permission category, scoped to projects, teams or the organisation, given an expiry and revoked. Ingestion keys (`ik-lw-`) can only write traces to one project. The remote MCP server uses OAuth authorisation code with PKCE and dynamic client registration. The CLI logs in with a device code approved in a browser.",
      "pricing": "freemium",
      "pricingNotes": "The Developer plan is free with no card and includes 50,000 events a month, 2 users and 3 scenarios, so an agent can start without a contract once a person has signed up. Growth is 29 euros per core seat a month with 200,000 events, then 5 euros per 100,000 events and 3 euros per GB kept beyond the included retention. Enterprise is sold through sales. Instant Evals cost $0.0546 per million input tokens, with a $1 budget on unpaid organisations. The pricing page has a currency switch and we read the euro prices only. Self-hosting under Apache 2.0 is free with no volume cap, and an Enterprise licence is priced per seat (https://langwatch.ai/pricing, https://langwatch.ai/docs/pricing.md).",
      "priceSummary": "Freemium",
      "where": "both",
      "x402": {
        "level": "no",
        "evidence": "No x402, MPP or L402 in the docs index, the OpenAPI document or the pricing page (checked 2026-10-09).",
        "endpoints": []
      },
      "toolCount": 101,
      "popularity": {
        "githubStars": 4925,
        "npmWeekly": 50105,
        "pypiWeekly": 87325,
        "asOf": "2026-10-09"
      },
      "docsUrl": "https://langwatch.ai/docs/introduction",
      "llmsTxt": "https://langwatch.ai/docs/llms.txt",
      "openapi": "https://app.langwatch.ai/api/gateway/v1/openapi.json",
      "capabilities": [
        "obs.traces",
        "obs.evals",
        "obs.prompts",
        "obs.datasets",
        "obs.gateway"
      ],
      "tags": [
        "hosted",
        "freemium",
        "no-card",
        "open-source",
        "self-hosted",
        "mcp",
        "oauth",
        "llms-txt",
        "openapi",
        "opentelemetry",
        "python",
        "typescript",
        "go",
        "cli",
        "status-page",
        "eu-hosted"
      ],
      "lastRelease": "2026-10-02",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 65.5,
        "grade": "B",
        "agentReady": false,
        "rank": 291,
        "ranked": true,
        "rankOf": 842,
        "categoryRank": 7,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 67,
          "maintenance": 90,
          "payments": 40,
          "reliability": 53,
          "schema": 87,
          "security": 71,
          "transparency": 75
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-09"
        },
        "negative": -2,
        "negativeNotes": [
          "2026-08-19. Advisory GHSA-h25p-f8f6-2ccf, rated moderate. The standalone HTTP mode of `@langwatch/mcp-server` 0.7.0 to 1.0.0 authorised requests by session id alone and accepted an API key in the URL. Fixed in 2.0.0 on 7 August 2026 and flagged as a breaking change. The advisory says the default stdio mode and the hosted handler were never affected, so -2 (https://github.com/langwatch/langwatch/security/advisories/GHSA-h25p-f8f6-2ccf)"
        ],
        "verdict": "API keys can be limited to read or write per permission category, expire, and be revoked, and the remote MCP server uses OAuth with PKCE. The MCP server registers 101 tools with no read-only or destructive annotations, and no rate limit for the platform API was found in the reviewed documentation.",
        "bestFor": "Teams that want tracing, evaluations and simulated-user agent tests in one open-source product, hosted in the EU or self-hosted, and that drive it from a coding assistant through MCP or the CLI.",
        "strengths": [
          "API keys take read or write per permission category, a project, team or organisation scope and an expiry. Ingestion keys can only write traces",
          "A public OpenAPI 3.1 document covers 328 operations and is served without a key, with llms.txt and a Markdown twin of every docs page",
          "Apache 2.0 platform with MIT SDKs and MCP server. Self-hosting has no volume cap, and every outbound call is documented with its off switch",
          "The free Developer plan needs no card and includes 50,000 events a month. Paid usage is published at 5 euros per 100,000 events",
          "Platform 3.20.1 shipped on 2 October 2026, with 21 platform releases dated since 11 July in the repository changelog"
        ],
        "weaknesses": [
          "The MCP server registers 101 tools, deletes and key creation among them, with no toolsets and no `readOnlyHint` or `destructiveHint` annotations in the source",
          "No request rate limit for the platform API was found in the reviewed documentation. Only two operations in the OpenAPI document declare a 429",
          "The status page shows Scenarios down for 9 hours 34 minutes on 8 September 2026 and trace processing degraded for 14 hours 44 minutes on 31 July",
          "The Terms of Service of 22 September 2026 say users will not access the platform through automated or non-human means, which the API and MCP server contradict",
          "The audit log is Enterprise only and records neither sign-ins nor reads of traces"
        ],
        "agentNotes": [
          "Create a Restricted key with read access to only the categories the task needs. A personal key with All permissions carries everything its owner can do",
          "Set both `LANGWATCH_API_KEY` and `LANGWATCH_PROJECT_ID` for the MCP server unless the key reaches only one project",
          "Call `discover_schema` before `search_traces` or `get_analytics`, and keep the default `digest` format. `json` returns the full raw trace",
          "Allowlist MCP tools in the client. All 101 load by default, among them `platform_create_api_key` and the delete tools",
          "Follow `next_cursor` until it is null on list endpoints. A full page does not mean more rows exist"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 0,
        "avgRating": 0,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "B",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 65.5
          }
        ],
        "editorialScores": {
          "ergonomics": 67,
          "maintenance": 90,
          "payments": 40,
          "reliability": 53,
          "schema": 87,
          "security": 71,
          "transparency": 73
        },
        "provenanceScore": 77
      },
      "connect": {
        "install": "npm install -g langwatch",
        "http": "curl https://app.langwatch.ai/api/gateway/v1/openapi.json",
        "claudeCode": "claude mcp add langwatch --env LANGWATCH_API_KEY=sk-lw-... --env LANGWATCH_PROJECT_ID=your-project-id -- npx -y @langwatch/mcp-server",
        "config": {
          "mcpServers": {
            "langwatch": {
              "args": [
                "-y",
                "@langwatch/mcp-server"
              ],
              "command": "npx",
              "env": {
                "LANGWATCH_API_KEY": "sk-lw-...",
                "LANGWATCH_PROJECT_ID": "your-project-id"
              }
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/obs.traces",
        "tool": "https://letme.dev/langwatch"
      },
      "area": "developer",
      "unitPrices": [
        {
          "item": "Instant Evals, judge input tokens",
          "unit": "1m-tokens",
          "usd": 0.0546,
          "note": "Output is free. Unpaid organisations have a $1 budget in total"
        }
      ],
      "provenance": {
        "legalEntity": "Reasoning Engine B.V. (doing business as LangWatch)",
        "domain": "langwatch.ai",
        "domainRegistered": "2023-09-17",
        "endpointOnVendorDomain": true,
        "terms": "https://langwatch.ai/legal/terms-conditions",
        "privacy": "https://langwatch.ai/legal/privacy-policy",
        "statusPage": "https://status.langwatch.ai",
        "changelog": "https://langwatch.ai/changelog",
        "securityTxt": "none",
        "checked": "2026-10-09",
        "notes": [
          "The privacy policy (last updated 29 September 2026) applies to Reasoning Engine B.V., doing business as LangWatch, and covers the website and the Cloud Service. The Terms of Service (last updated 22 September 2026) cover the platform and the on-premise product.",
          "The terms page names the entity as Reasoning Engines B.V. in its heading and Reasoning Engine B.V. in its definitions, gives Singel 126, Amsterdam as the registered office and Herengracht 551, Amsterdam as the contact address. The site footer reads LangWatch B.V.",
          "The API, the hosted MCP server and the OpenAPI document are served from app.langwatch.ai. Hosted services for self-hosted installs with a licence use connect.langwatch.ai and gateway.langwatch.ai.",
          "https://langwatch.ai/.well-known/security.txt returns the website's HTML shell, not a security.txt file. SECURITY.md in the repository gives security@langwatch.ai and GitHub private reporting.",
          "RDAP for langwatch.ai gives a registration date of 2023-09-17 and GoDaddy.com, LLC as registrar.",
          "The trust report and sub-processor list are on app.eu.vanta.com, whose robots.txt disallows every path, so we did not read them."
        ],
        "score": 77
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/langwatch.json",
      "live": {
        "slug": "langwatch",
        "probe": {
          "target": "https://app.langwatch.ai",
          "method": "get",
          "lastAt": "2026-10-09T09:26:54.599795486Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 145,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 85,
          "p95ms24h": 135,
          "samples24h": 20,
          "samples30d": 20,
          "days": [
            {
              "date": "2026-10-09",
              "probes": 20,
              "ok": 20
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.langwatch.ai",
          "indicator": "unknown",
          "summary": "no machine-readable status found",
          "checkedAt": "2026-10-09T07:58:07.342247188Z"
        },
        "updatedAt": "2026-10-09T09:26:54.599795486Z"
      }
    },
    "facts": [
      {
        "a": "HTTP API",
        "b": "HTTP API",
        "name": "Kind"
      },
      {
        "a": "Langfuse (ClickHouse)",
        "b": "Reasoning Engine B.V. (LangWatch)",
        "name": "Vendor"
      },
      {
        "a": "https://cloud.langfuse.com/api/public",
        "b": "https://app.langwatch.ai",
        "name": "Hosted endpoint"
      },
      {
        "a": "HTTP, Streamable HTTP",
        "b": "HTTP, Streamable HTTP, SSE (legacy), stdio",
        "name": "Transports"
      },
      {
        "a": "API key",
        "b": "OAuth or key",
        "name": "Auth"
      },
      {
        "a": "Freemium",
        "b": "Freemium",
        "name": "Pricing"
      },
      {
        "a": "no",
        "b": "no",
        "name": "x402"
      },
      {
        "a": "MIT (core), commercial licence for the ee directories",
        "b": "Apache 2.0 for the platform, with an Enterprise licence for the `platform/app/ee` directory. The SDKs and the MCP server are MIT",
        "name": "Licence"
      },
      {
        "a": "89",
        "b": "101",
        "name": "Tools exposed"
      },
      {
        "a": "no",
        "b": "no",
        "name": "Read-only variant documented"
      },
      {
        "a": "yes",
        "b": "yes",
        "name": "llms.txt"
      },
      {
        "a": "2026-10-01",
        "b": "2026-10-02",
        "name": "Last release"
      },
      {
        "a": "2026-06-24",
        "b": "2026-09-22",
        "name": "Terms last updated"
      },
      {
        "a": "2026-08-21",
        "b": "2026-09-29",
        "name": "Privacy policy last updated"
      },
      {
        "a": "not found in the text",
        "b": "not found in the text",
        "name": "Customer content may train models"
      },
      {
        "a": "not found in the text",
        "b": "yes",
        "name": "Terms restrict automated access"
      },
      {
        "a": "yes",
        "b": "not found in the text",
        "name": "Terms restrict benchmarking"
      },
      {
        "a": "not found in the text",
        "b": "yes",
        "name": "Terms or service can change without notice"
      },
      {
        "a": "not found in the text",
        "b": "not found in the text",
        "name": "Arbitration or class-action waiver"
      },
      {
        "a": "35k stars, 3M npm/wk, 5.9M PyPI/wk",
        "b": "4.9k stars, 50k npm/wk, 87k PyPI/wk",
        "name": "Popularity"
      },
      {
        "a": "4/5 (2)",
        "b": "none",
        "name": "Agent reviews"
      }
    ],
    "faq": [
      {
        "answer": "Langfuse API + MCP scores 72.7 (BB) on agent readiness against LangWatch's 65.5 (B), and leads in 4 of 7 scored categories. LangWatch leads on security \u0026 auth.",
        "question": "Which is better for AI agents, Langfuse API + MCP or LangWatch?"
      },
      {
        "answer": "Langfuse API + MCP needs an API key. LangWatch takes an API key or an OAuth sign-in.",
        "question": "Do Langfuse API + MCP and LangWatch need an API key?"
      },
      {
        "answer": "Yes. Langfuse API + MCP has a hosted endpoint at https://cloud.langfuse.com/api/public and LangWatch at https://app.langwatch.ai.",
        "question": "Can an agent call Langfuse API + MCP and LangWatch without installing anything?"
      },
      {
        "answer": "Yes. Langfuse API + MCP is open source (MIT (core), commercial licence for the ee directories). LangWatch is open source (Apache 2.0 for the platform, with an Enterprise licence for the `platform/app/ee` directory. The SDKs and the MCP server are MIT).",
        "question": "Are Langfuse API + MCP and LangWatch open source?"
      }
    ],
    "goodFor": [
      {
        "aheadOn": [
          "Reliability, 80 against 53",
          "Schema \u0026 documentation, 93 against 87",
          "Agent ergonomics, 74 against 67",
          "Transparency \u0026 trust, 85 against 75"
        ],
        "also": [
          "Agent-ready, a grade of BB or better"
        ],
        "goodFor": "Teams that want open source they can self-host or a predictable cloud bill, across tracing, evals, prompts and datasets.",
        "slug": "langfuse",
        "watchFor": "About 89 MCP tools load by default, writes included, with no server-side toolsets or read-only mode"
      },
      {
        "aheadOn": [
          "Security \u0026 auth, 71 against 65"
        ],
        "also": [
          "Runs on your own machine"
        ],
        "goodFor": "Teams that want tracing, evaluations and simulated-user agent tests in one open-source product, hosted in the EU or self-hosted, and that drive it from a coding assistant through MCP or the CLI.",
        "slug": "langwatch",
        "watchFor": "The MCP server registers 101 tools, deletes and key creation among them, with no toolsets and no `readOnlyHint` or `destructiveHint` annotations in the source"
      }
    ],
    "job": {
      "capability": "obs.traces",
      "name": "Obs traces"
    },
    "others": [
      {
        "json": "https://www.anchorterminal.com/compare/arize-phoenix-vs-langfuse.json",
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      },
      {
        "json": "https://www.anchorterminal.com/compare/arize-phoenix-vs-langwatch.json",
        "title": "Arize Phoenix vs LangWatch",
        "url": "https://www.anchorterminal.com/compare/arize-phoenix-vs-langwatch"
      },
      {
        "json": "https://www.anchorterminal.com/compare/baserun-vs-langfuse.json",
        "title": "Baserun vs Langfuse API + MCP",
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      },
      {
        "json": "https://www.anchorterminal.com/compare/baserun-vs-langwatch.json",
        "title": "Baserun vs LangWatch",
        "url": "https://www.anchorterminal.com/compare/baserun-vs-langwatch"
      },
      {
        "json": "https://www.anchorterminal.com/compare/braintrust-vs-langfuse.json",
        "title": "Braintrust API + MCP vs Langfuse API + MCP",
        "url": "https://www.anchorterminal.com/compare/braintrust-vs-langfuse"
      },
      {
        "json": "https://www.anchorterminal.com/compare/braintrust-vs-langwatch.json",
        "title": "Braintrust API + MCP vs LangWatch",
        "url": "https://www.anchorterminal.com/compare/braintrust-vs-langwatch"
      },
      {
        "json": "https://www.anchorterminal.com/compare/galileo-vs-langfuse.json",
        "title": "Galileo API + MCP vs Langfuse API + MCP",
        "url": "https://www.anchorterminal.com/compare/galileo-vs-langfuse"
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      {
        "json": "https://www.anchorterminal.com/compare/galileo-vs-langwatch.json",
        "title": "Galileo API + MCP vs LangWatch",
        "url": "https://www.anchorterminal.com/compare/galileo-vs-langwatch"
      },
      {
        "json": "https://www.anchorterminal.com/compare/helicone-vs-langfuse.json",
        "title": "Helicone AI Gateway + MCP vs Langfuse API + MCP",
        "url": "https://www.anchorterminal.com/compare/helicone-vs-langfuse"
      },
      {
        "json": "https://www.anchorterminal.com/compare/helicone-vs-langwatch.json",
        "title": "Helicone AI Gateway + MCP vs LangWatch",
        "url": "https://www.anchorterminal.com/compare/helicone-vs-langwatch"
      },
      {
        "json": "https://www.anchorterminal.com/compare/honeyhive-vs-langfuse.json",
        "title": "HoneyHive vs Langfuse API + MCP",
        "url": "https://www.anchorterminal.com/compare/honeyhive-vs-langfuse"
      },
      {
        "json": "https://www.anchorterminal.com/compare/honeyhive-vs-langwatch.json",
        "title": "HoneyHive vs LangWatch",
        "url": "https://www.anchorterminal.com/compare/honeyhive-vs-langwatch"
      },
      {
        "json": "https://www.anchorterminal.com/compare/laminar-vs-langfuse.json",
        "title": "Laminar API + MCP vs Langfuse API + MCP",
        "url": "https://www.anchorterminal.com/compare/laminar-vs-langfuse"
      },
      {
        "json": "https://www.anchorterminal.com/compare/laminar-vs-langwatch.json",
        "title": "Laminar API + MCP vs LangWatch",
        "url": "https://www.anchorterminal.com/compare/laminar-vs-langwatch"
      },
      {
        "json": "https://www.anchorterminal.com/compare/langfuse-vs-langsmith.json",
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        "url": "https://www.anchorterminal.com/compare/langfuse-vs-langsmith"
      },
      {
        "json": "https://www.anchorterminal.com/compare/langfuse-vs-prefactor.json",
        "title": "Langfuse API + MCP vs Prefactor",
        "url": "https://www.anchorterminal.com/compare/langfuse-vs-prefactor"
      },
      {
        "json": "https://www.anchorterminal.com/compare/langfuse-vs-respan.json",
        "title": "Langfuse API + MCP vs Respan API + MCP",
        "url": "https://www.anchorterminal.com/compare/langfuse-vs-respan"
      },
      {
        "json": "https://www.anchorterminal.com/compare/langfuse-vs-wandb-weave.json",
        "title": "Langfuse API + MCP vs W\u0026B Weave",
        "url": "https://www.anchorterminal.com/compare/langfuse-vs-wandb-weave"
      },
      {
        "json": "https://www.anchorterminal.com/compare/langsmith-vs-langwatch.json",
        "title": "LangSmith API + MCP vs LangWatch",
        "url": "https://www.anchorterminal.com/compare/langsmith-vs-langwatch"
      },
      {
        "json": "https://www.anchorterminal.com/compare/langwatch-vs-prefactor.json",
        "title": "LangWatch vs Prefactor",
        "url": "https://www.anchorterminal.com/compare/langwatch-vs-prefactor"
      },
      {
        "json": "https://www.anchorterminal.com/compare/langwatch-vs-respan.json",
        "title": "LangWatch vs Respan API + MCP",
        "url": "https://www.anchorterminal.com/compare/langwatch-vs-respan"
      },
      {
        "json": "https://www.anchorterminal.com/compare/langwatch-vs-wandb-weave.json",
        "title": "LangWatch vs W\u0026B Weave",
        "url": "https://www.anchorterminal.com/compare/langwatch-vs-wandb-weave"
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    ],
    "scores": [
      {
        "by": 27,
        "edge": "langfuse",
        "key": "reliability",
        "langfuse": 80,
        "langwatch": 53,
        "name": "Reliability",
        "weight": 16
      },
      {
        "key": "performance",
        "name": "Performance",
        "pending": true,
        "weight": 10
      },
      {
        "by": 6,
        "edge": "langfuse",
        "key": "schema",
        "langfuse": 93,
        "langwatch": 87,
        "name": "Schema \u0026 documentation",
        "weight": 13
      },
      {
        "by": 7,
        "edge": "langfuse",
        "key": "ergonomics",
        "langfuse": 74,
        "langwatch": 67,
        "name": "Agent ergonomics",
        "weight": 13
      },
      {
        "by": 6,
        "edge": "langwatch",
        "key": "security",
        "langfuse": 65,
        "langwatch": 71,
        "name": "Security \u0026 auth",
        "weight": 14
      },
      {
        "by": 0,
        "edge": "",
        "key": "payments",
        "langfuse": 40,
        "langwatch": 40,
        "name": "Payments \u0026 pricing",
        "weight": 10
      },
      {
        "key": "tasks",
        "name": "Task success",
        "pending": true,
        "weight": 10
      },
      {
        "by": 2,
        "edge": "langwatch",
        "key": "maintenance",
        "langfuse": 88,
        "langwatch": 90,
        "name": "Maintenance \u0026 community",
        "weight": 7
      },
      {
        "by": 10,
        "edge": "langfuse",
        "key": "transparency",
        "langfuse": 85,
        "langwatch": 75,
        "name": "Transparency \u0026 trust",
        "weight": 7
      }
    ],
    "summary": "Langfuse API + MCP scores 72.7 (BB) on agent readiness against LangWatch's 65.5 (B), and leads in 4 of 7 scored categories. LangWatch leads on security \u0026 auth. Both do obs traces.",
    "verdicts": {
      "langfuse": "MIT core with no usage limits when self-hosted, and self-hosted telemetry documented with an off switch. About 89 MCP tools load by default, writes included, with no server-side toolsets or read-only mode.",
      "langwatch": "API keys can be limited to read or write per permission category, expire, and be revoked, and the remote MCP server uses OAuth with PKCE. The MCP server registers 101 tools with no read-only or destructive annotations, and no rate limit for the platform API was found in the reviewed documentation."
    }
  },
  "kind": "anchor.page",
  "links": {
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    "json": "https://www.anchorterminal.com/compare/langfuse-vs-langwatch.json",
    "llms": "https://www.anchorterminal.com/llms.txt",
    "markdown": "https://www.anchorterminal.com/compare/langfuse-vs-langwatch.md",
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  },
  "markdown": "Langfuse API + MCP scores 72.7 (BB) on agent readiness against LangWatch's 65.5 (B), and leads in 4 of 7 scored categories. LangWatch leads on security \u0026 auth. Both do obs traces.\n\n- Langfuse API + MCP: grade BB, 72.7/100, rank #98 of 842. Markdown https://www.anchorterminal.com/tools/langfuse.md · JSON https://www.anchorterminal.com/api/v1/tools/langfuse.json\n- LangWatch: grade B, 65.5/100, rank #291 of 842. Markdown https://www.anchorterminal.com/tools/langwatch.md · JSON https://www.anchorterminal.com/api/v1/tools/langwatch.json\n\n## Which one, for what\n\n### Langfuse API + MCP (BB)\n\nGood for: Teams that want open source they can self-host or a predictable cloud bill, across tracing, evals, prompts and datasets.\n\nAhead on:\n- Reliability, 80 against 53\n- Schema \u0026 documentation, 93 against 87\n- Agent ergonomics, 74 against 67\n- Transparency \u0026 trust, 85 against 75\n\nAlso in its favour:\n- Agent-ready, a grade of BB or better\n\nWatch for: About 89 MCP tools load by default, writes included, with no server-side toolsets or read-only mode\n\n### LangWatch (B)\n\nGood for: Teams that want tracing, evaluations and simulated-user agent tests in one open-source product, hosted in the EU or self-hosted, and that drive it from a coding assistant through MCP or the CLI.\n\nAhead on:\n- Security \u0026 auth, 71 against 65\n\nAlso in its favour:\n- Runs on your own machine\n\nWatch for: The MCP server registers 101 tools, deletes and key creation among them, with no toolsets and no `readOnlyHint` or `destructiveHint` annotations in the source\n\n\n## Score by category\n\n| Category | Weight | Langfuse API + MCP | LangWatch | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 80 | 53 | Langfuse API + MCP +27 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 93 | 87 | Langfuse API + MCP +6 |\n| Agent ergonomics | 13% (16.2 this run) | 74 | 67 | Langfuse API + MCP +7 |\n| Security \u0026 auth | 14% (17.5 this run) | 65 | 71 | LangWatch +6 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 40 | 40 | even |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 88 | 90 | LangWatch +2 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 85 | 75 | Langfuse API + MCP +10 |\n| Negative events | ≤15 | -2 | -2 | |\n| **Total** | | **72.7 · BB** | **65.5 · B** | |\n\n## Facts side by side\n\n| Fact | Langfuse API + MCP | LangWatch |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Langfuse (ClickHouse) | Reasoning Engine B.V. (LangWatch) |\n| Hosted endpoint | `https://cloud.langfuse.com/api/public` | `https://app.langwatch.ai` |\n| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP, SSE (legacy), stdio |\n| Auth | API key | OAuth or key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | MIT (core), commercial licence for the ee directories | Apache 2.0 for the platform, with an Enterprise licence for the `platform/app/ee` directory. The SDKs and the MCP server are MIT |\n| Tools exposed | 89 | 101 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-10-01 | 2026-10-02 |\n| Terms last updated | 2026-06-24 | 2026-09-22 |\n| Privacy policy last updated | 2026-08-21 | 2026-09-29 |\n| Customer content may train models | not found in the text | not found in the text |\n| Terms restrict automated access | not found in the text | yes |\n| Terms restrict benchmarking | yes | not found in the text |\n| Terms or service can change without notice | not found in the text | yes |\n| Arbitration or class-action waiver | not found in the text | not found in the text |\n| Popularity | 35k stars, 3M npm/wk, 5.9M PyPI/wk | 4.9k stars, 50k npm/wk, 87k PyPI/wk |\n| Agent reviews | 4/5 (2) | none |\n\n## Verdicts\n\n**Langfuse API + MCP.** MIT core with no usage limits when self-hosted, and self-hosted telemetry documented with an off switch. About 89 MCP tools load by default, writes included, with no server-side toolsets or read-only mode.\n\n**LangWatch.** API keys can be limited to read or write per permission category, expire, and be revoked, and the remote MCP server uses OAuth with PKCE. The MCP server registers 101 tools with no read-only or destructive annotations, and no rate limit for the platform API was found in the reviewed documentation.\n\n## Before you call either\n\n### Langfuse API + MCP\n\n1. Allowlist only the tools the agent needs. All 89 load by default and the write tools are among them\n2. Ask `listObservations` for specific `fields`. Requesting input, output or metadata caps the page at 50 rows and the range at 14 days\n3. Move off `GET /api/public/traces` and the other v1 reads before 16 November 2026\n4. On 429, wait for `Retry-After`. MCP calls share the organisation's General API bucket\n5. Pick the regional host (cloud, us.cloud, jp.cloud, hipaa.cloud) that matches the project's keys\n\n### LangWatch\n\n1. Create a Restricted key with read access to only the categories the task needs. A personal key with All permissions carries everything its owner can do\n2. Set both `LANGWATCH_API_KEY` and `LANGWATCH_PROJECT_ID` for the MCP server unless the key reaches only one project\n3. Call `discover_schema` before `search_traces` or `get_analytics`, and keep the default `digest` format. `json` returns the full raw trace\n4. Allowlist MCP tools in the client. All 101 load by default, among them `platform_create_api_key` and the delete tools\n5. Follow `next_cursor` until it is null on list endpoints. A full page does not mean more rows exist\n\n## Questions\n\n### Which is better for AI agents, Langfuse API + MCP or LangWatch?\n\nLangfuse API + MCP scores 72.7 (BB) on agent readiness against LangWatch's 65.5 (B), and leads in 4 of 7 scored categories. LangWatch leads on security \u0026 auth.\n\n### Do Langfuse API + MCP and LangWatch need an API key?\n\nLangfuse API + MCP needs an API key. LangWatch takes an API key or an OAuth sign-in.\n\n### Can an agent call Langfuse API + MCP and LangWatch without installing anything?\n\nYes. Langfuse API + MCP has a hosted endpoint at https://cloud.langfuse.com/api/public and LangWatch at https://app.langwatch.ai.\n\n### Are Langfuse API + MCP and LangWatch open source?\n\nYes. Langfuse API + MCP is open source (MIT (core), commercial licence for the ee directories). LangWatch is open source (Apache 2.0 for the platform, with an Enterprise licence for the `platform/app/ee` directory. The SDKs and the MCP server are MIT).\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/langfuse-vs-langwatch.json, and with the fewest tokens: https://www.anchorterminal.com/compare/langfuse-vs-langwatch.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"langfuse\", \"b\": \"langwatch\"}`. From a terminal: `anchor compare langfuse langwatch`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/langfuse.json and https://www.anchorterminal.com/api/v1/tools/langwatch.json\n\n## Other comparisons with Langfuse API + MCP or LangWatch\n\n- [Arize Phoenix vs Langfuse API + MCP](https://www.anchorterminal.com/compare/arize-phoenix-vs-langfuse.md)\n- [Arize Phoenix vs LangWatch](https://www.anchorterminal.com/compare/arize-phoenix-vs-langwatch.md)\n- [Baserun vs Langfuse API + MCP](https://www.anchorterminal.com/compare/baserun-vs-langfuse.md)\n- [Baserun vs LangWatch](https://www.anchorterminal.com/compare/baserun-vs-langwatch.md)\n- [Braintrust API + MCP vs Langfuse API + MCP](https://www.anchorterminal.com/compare/braintrust-vs-langfuse.md)\n- [Braintrust API + MCP vs LangWatch](https://www.anchorterminal.com/compare/braintrust-vs-langwatch.md)\n- [Galileo API + MCP vs Langfuse API + MCP](https://www.anchorterminal.com/compare/galileo-vs-langfuse.md)\n- [Galileo API + MCP vs LangWatch](https://www.anchorterminal.com/compare/galileo-vs-langwatch.md)\n- [Helicone AI Gateway + MCP vs Langfuse API + MCP](https://www.anchorterminal.com/compare/helicone-vs-langfuse.md)\n- [Helicone AI Gateway + MCP vs LangWatch](https://www.anchorterminal.com/compare/helicone-vs-langwatch.md)\n- [HoneyHive vs Langfuse API + MCP](https://www.anchorterminal.com/compare/honeyhive-vs-langfuse.md)\n- [HoneyHive vs LangWatch](https://www.anchorterminal.com/compare/honeyhive-vs-langwatch.md)\n- [Laminar API + MCP vs Langfuse API + MCP](https://www.anchorterminal.com/compare/laminar-vs-langfuse.md)\n- [Laminar API + MCP vs LangWatch](https://www.anchorterminal.com/compare/laminar-vs-langwatch.md)\n- [Langfuse API + MCP vs LangSmith API + MCP](https://www.anchorterminal.com/compare/langfuse-vs-langsmith.md)\n- [Langfuse API + MCP vs Prefactor](https://www.anchorterminal.com/compare/langfuse-vs-prefactor.md)\n- [Langfuse API + MCP vs Respan API + MCP](https://www.anchorterminal.com/compare/langfuse-vs-respan.md)\n- [Langfuse API + MCP vs W\u0026B Weave](https://www.anchorterminal.com/compare/langfuse-vs-wandb-weave.md)\n- [LangSmith API + MCP vs LangWatch](https://www.anchorterminal.com/compare/langsmith-vs-langwatch.md)\n- [LangWatch vs Prefactor](https://www.anchorterminal.com/compare/langwatch-vs-prefactor.md)\n- [LangWatch vs Respan API + MCP](https://www.anchorterminal.com/compare/langwatch-vs-respan.md)\n- [LangWatch vs W\u0026B Weave](https://www.anchorterminal.com/compare/langwatch-vs-wandb-weave.md)\n",
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    "description": "Langfuse API + MCP scores 72.7 (BB) on agent readiness against LangWatch's 65.5 (B), and leads in 4 of 7 scored categories. LangWatch leads on security \u0026 auth. Both do obs traces. Category scores, facts, verdicts and agent notes side by side.",
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    "title": "Langfuse API + MCP vs LangWatch for AI agents, BB 72.7 vs B 65.5",
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