{
  "data": {
    "a": {
      "slug": "helicone",
      "name": "Helicone AI Gateway + MCP",
      "vendor": "Helicone (Mintlify)",
      "vendorUrl": "https://www.helicone.ai",
      "kind": "http-api",
      "category": "agent-observability",
      "summary": "Open-source LLM observability that logs requests through an OpenAI-compatible gateway (100+ models, fallbacks, caching, rate limits) or async logging.",
      "url": "https://www.anchorterminal.com/tools/helicone",
      "markdownUrl": "https://www.anchorterminal.com/tools/helicone.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/helicone.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/helicone.json",
      "repo": "https://github.com/Helicone/helicone",
      "license": "Apache-2.0",
      "transports": [
        "http",
        "stdio"
      ],
      "remoteUrl": "https://ai-gateway.helicone.ai",
      "packages": [
        {
          "registry": "npm",
          "name": "@helicone/helpers"
        },
        {
          "registry": "pypi",
          "name": "helicone-helpers"
        },
        {
          "registry": "npm",
          "name": "@helicone/mcp"
        }
      ],
      "auth": "api-key",
      "authNotes": "Helicone API key (`sk-helicone-...`) as a Bearer token on the gateway and REST API. Bring your own provider keys, or bill model usage to Helicone credits, which since 25 August 2026 only works for organisations Helicone has switched on (others get a 403 asking them to contact support). The MCP server reads `HELICONE_API_KEY` from the environment.",
      "pricing": "freemium",
      "pricingNotes": "Hobby free with 10,000 requests a month, 1 GB of storage, 1 seat and 7 days of retention, no card. Pro $79 a month and Team $799 a month, each with 10,000 requests and 1 GB free then usage-based charges the pricing page doesn't itemise. The pricing page still shows 7-day trials, but a commit on 30 August 2026 removed the in-app self-serve upgrade paths and sends upgrades to a contact page. Enterprise custom. Gateway credits pass model prices through at 0% markup, but since 25 August 2026 need Helicone to enable them per organisation. Self-hosted is free under Apache-2.0 with Docker Compose or Helm, you run ClickHouse, Postgres and object storage (https://www.helicone.ai/pricing).",
      "priceSummary": "$79 / mo",
      "where": "both",
      "x402": {
        "level": "no",
        "evidence": "No x402 support in docs or pricing (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": 3,
      "popularity": {
        "githubStars": 6190,
        "npmWeekly": 4328,
        "pypiWeekly": 4210,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://docs.helicone.ai",
      "llmsTxt": "https://docs.helicone.ai/llms.txt",
      "openapi": "https://docs.helicone.ai/ai-gateway.openapi.json",
      "capabilities": [
        "obs.traces",
        "obs.gateway",
        "obs.prompts",
        "obs.datasets",
        "obs.evals"
      ],
      "tags": [
        "hosted",
        "freemium",
        "no-card",
        "open-source",
        "self-hosted",
        "mcp",
        "llms-txt",
        "openapi",
        "typescript",
        "python",
        "webhooks"
      ],
      "lastRelease": "2026-09-16",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 46.9,
        "grade": "D",
        "agentReady": false,
        "rank": 746,
        "ranked": true,
        "rankOf": 842,
        "categoryRank": 12,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 70,
          "maintenance": 66,
          "payments": 30,
          "reliability": 50,
          "schema": 69,
          "security": 50,
          "transparency": 69
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": -10,
        "negativeNotes": [
          "2026-08-30. Helicone's own security commit (INC-657) fixed an authenticated cross-tenant read of other organisations' decrypted provider keys, a route that let any account mint proxy keys spending another organisation's provider key, a shared client that reused one organisation's OpenRouter key for others, an unauthenticated SSRF path and unauthenticated Stripe routes. Fixed, but disclosed only in the commit message, with no advisory or key-rotation notice that we found. -7 after decay for the fix (https://github.com/Helicone/helicone/commit/ca34549ea56f7ed587843f82d9cc19baa1f36ba4)",
          "2026-09-16. A second fix closed a platform-admin takeover with a forged API key and a cross-tenant read through HQL, reported through Helicone's disclosure programme the same day. Fixed within hours and again disclosed only in the commit. -3 (https://github.com/Helicone/helicone/commit/067d9290acb4f1fc9320e902fc67b4b399b50363)"
        ],
        "verdict": "One base-URL change gives logging, caching, fallbacks and rate limits for 100+ models. Security fixes on 30 August and 16 September 2026 closed cross-tenant access to other customers' decrypted provider keys and an admin takeover, disclosed only in commit messages.",
        "bestFor": "A team that wants request logging and cost tracking through a gateway with almost no code, and could swap it out later.",
        "strengths": [
          "One base-URL change gives logging, caching, fallbacks and rate limits for 100+ models",
          "Apache-2.0 with Docker Compose and Helm self-hosting",
          "Per-plan ingestion and API rate limits published on the pricing page",
          "OpenAPI for the gateway, a Swagger file for the REST API and an llms.txt",
          "Free Hobby plan with 10,000 requests a month and no card"
        ],
        "weaknesses": [
          "Security fixes on 30 August and 16 September 2026 closed cross-tenant access to other customers' decrypted provider keys and an admin takeover, disclosed only in commit messages",
          "Maintenance mode since March 2026, changelog silent since 26 November 2025, and Experiments, Realtime and self-serve upgrades removed on 30 August 2026",
          "The status page has no incident history, leaves out the AI Gateway and doesn't mention the four-day outage of 14 to 18 May 2026",
          "Helicone credits need a per-organisation switch since 25 August 2026, so new accounts must bring their own provider keys",
          "Privacy policy last updated in February 2023, with no retention period or DPA"
        ],
        "agentNotes": [
          "Bring your own provider keys. Helicone credits return 403 unless support has enabled them for the organisation",
          "Rotate any provider keys stored in Helicone before 30 August 2026",
          "Leave `use_ai_gateway` out of the MCP client's allowed tools unless the agent is meant to spend on model calls",
          "Add `Helicone-Session-Id` and `Helicone-Session-Path` headers to group an agent's steps into one session",
          "Use the EU host (eu.helicone.ai) if the account was created there"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 2,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "D",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 46.9
          }
        ],
        "editorialScores": {
          "ergonomics": 70,
          "maintenance": 66,
          "payments": 30,
          "reliability": 50,
          "schema": 69,
          "security": 50,
          "transparency": 60
        },
        "provenanceScore": 77
      },
      "connect": {
        "http": "curl https://ai-gateway.helicone.ai/chat/completions -H \"Authorization: Bearer $HELICONE_API_KEY\" \\\n  -H \"content-type: application/json\" -d '{\"model\":\"gpt-4o-mini\",\"messages\":[{\"role\":\"user\",\"content\":\"Hello\"}]}'",
        "claudeCode": "claude mcp add helicone -e HELICONE_API_KEY=$HELICONE_API_KEY -- npx -y @helicone/mcp@latest",
        "config": {
          "mcpServers": {
            "helicone": {
              "args": [
                "-y",
                "@helicone/mcp@latest"
              ],
              "command": "npx",
              "env": {
                "HELICONE_API_KEY": "${HELICONE_API_KEY}"
              }
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/obs.traces",
        "tool": "https://letme.dev/helicone"
      },
      "area": "developer",
      "unitPrices": [
        {
          "item": "Pro plan",
          "unit": "month",
          "usd": 79,
          "note": "10,000 requests and 1 GB free, then usage-based"
        },
        {
          "item": "Team plan",
          "unit": "month",
          "usd": 799,
          "note": "5 organisations, SOC 2 and HIPAA, 10,000 requests and 1 GB free, then usage-based"
        }
      ],
      "provenance": {
        "legalEntity": "Helicone, Inc.",
        "domain": "helicone.ai",
        "domainRegistered": "2022-11-14",
        "endpointOnVendorDomain": true,
        "terms": "https://www.helicone.ai/terms",
        "privacy": "https://www.helicone.ai/privacy",
        "statusPage": "https://status.helicone.ai",
        "changelog": "https://www.helicone.ai/changelog",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "notes": [
          "Terms still name Helicone, Inc. and were last updated 2024-09-17, before the Mintlify acquisition"
        ],
        "score": 77
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/helicone.json",
      "live": {
        "slug": "helicone",
        "probe": {
          "target": "https://ai-gateway.helicone.ai",
          "method": "get",
          "lastAt": "2026-10-09T09:44:57.332957725Z",
          "lastOk": true,
          "lastStatus": 405,
          "lastMs": 54,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 56,
          "p95ms24h": 162,
          "samples24h": 261,
          "samples30d": 2290,
          "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": 104,
              "ok": 104
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.helicone.ai",
          "indicator": "unknown",
          "summary": "no machine-readable status found",
          "checkedAt": "2026-10-09T07:58:02.938224978Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "Helicone/helicone",
            "version": "v2025.08.21-1",
            "released": "2025-08-21",
            "seenAt": "2026-10-08T16:15:43.658891444Z"
          },
          {
            "registry": "npm",
            "name": "@helicone/helpers",
            "version": "1.8.3",
            "seenAt": "2026-10-08T16:15:39.110387764Z"
          },
          {
            "registry": "npm",
            "name": "@helicone/mcp",
            "version": "0.1.6",
            "seenAt": "2026-10-08T16:15:43.374156833Z"
          },
          {
            "registry": "pypi",
            "name": "helicone-helpers",
            "version": "1.2.1",
            "released": "2025-11-08",
            "seenAt": "2026-10-08T16:15:43.172139276Z"
          }
        ],
        "githubStars": 6207,
        "npmWeekly": 4098,
        "pypiWeekly": 5047,
        "securityTxt": {
          "url": "https://helicone.ai/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-08T15:38:48.322224123Z"
        },
        "llmsTxt": {
          "url": "https://docs.helicone.ai/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-08T14:00:30.524662626Z"
        },
        "domain": {
          "domain": "helicone.ai",
          "registered": "2022-11-14",
          "source": "https://rdap.identitydigital.services/rdap/domain/helicone.ai",
          "checkedAt": "2026-10-04T13:08:06.915944951Z"
        },
        "pages": [
          {
            "url": "https://www.helicone.ai/changelog",
            "kind": "changelog",
            "status": 200,
            "checkedAt": "2026-10-08T18:28:13.75089463Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "1af05c56483a"
          },
          {
            "url": "https://www.helicone.ai/blog/joining-mintlify",
            "kind": "deprecations",
            "status": 200,
            "checkedAt": "2026-10-08T18:28:11.435654609Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "a82c441b1103"
          },
          {
            "url": "https://www.helicone.ai/pricing",
            "kind": "pricing",
            "status": 200,
            "checkedAt": "2026-10-08T18:28:15.76040529Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "4b1e79419d28"
          },
          {
            "url": "https://www.helicone.ai/privacy",
            "kind": "privacy",
            "status": 200,
            "checkedAt": "2026-10-08T18:28:17.685382305Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "47e9ad5d395a"
          },
          {
            "url": "https://www.helicone.ai/terms",
            "kind": "terms",
            "status": 200,
            "checkedAt": "2026-10-08T18:28:19.61207903Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "adbbffec4ecd"
          }
        ],
        "updatedAt": "2026-10-09T09:44:57.332957725Z"
      }
    },
    "answer": "LangWatch scores 65.5 (B) on agent readiness against Helicone AI Gateway + MCP's 46.9 (D), and leads in 6 of 7 scored categories.",
    "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": "2026-10-09T09:44:59.207062548Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 56,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 79,
          "p95ms24h": 135,
          "samples24h": 23,
          "samples30d": 23,
          "days": [
            {
              "date": "2026-10-09",
              "probes": 23,
              "ok": 23
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.langwatch.ai",
          "indicator": "unknown",
          "summary": "no machine-readable status found",
          "checkedAt": "2026-10-09T07:58:07.342247188Z"
        },
        "updatedAt": "2026-10-09T09:44:59.207062548Z"
      }
    },
    "facts": [
      {
        "a": "HTTP API",
        "b": "HTTP API",
        "name": "Kind"
      },
      {
        "a": "Helicone (Mintlify)",
        "b": "Reasoning Engine B.V. (LangWatch)",
        "name": "Vendor"
      },
      {
        "a": "https://ai-gateway.helicone.ai",
        "b": "https://app.langwatch.ai",
        "name": "Hosted endpoint"
      },
      {
        "a": "HTTP, stdio",
        "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": "Apache-2.0",
        "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": "3",
        "b": "101",
        "name": "Tools exposed"
      },
      {
        "a": "no",
        "b": "no",
        "name": "Read-only variant documented"
      },
      {
        "a": "yes",
        "b": "yes",
        "name": "llms.txt"
      },
      {
        "a": "2026-09-16",
        "b": "2026-10-02",
        "name": "Last release"
      },
      {
        "a": "2024-09-17",
        "b": "2026-09-22",
        "name": "Terms last updated"
      },
      {
        "a": "2023-02-28",
        "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": "yes",
        "b": "yes",
        "name": "Terms restrict automated access"
      },
      {
        "a": "not found in the text",
        "b": "not found in the text",
        "name": "Terms restrict benchmarking"
      },
      {
        "a": "yes",
        "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": "6.2k stars, 4.3k npm/wk, 4.2k PyPI/wk",
        "b": "4.9k stars, 50k npm/wk, 87k PyPI/wk",
        "name": "Popularity"
      },
      {
        "a": "2/5 (2)",
        "b": "none",
        "name": "Agent reviews"
      }
    ],
    "faq": [
      {
        "answer": "LangWatch scores 65.5 (B) on agent readiness against Helicone AI Gateway + MCP's 46.9 (D), and leads in 6 of 7 scored categories.",
        "question": "Which is better for AI agents, Helicone AI Gateway + MCP or LangWatch?"
      },
      {
        "answer": "Helicone AI Gateway + MCP needs an API key. LangWatch takes an API key or an OAuth sign-in.",
        "question": "Do Helicone AI Gateway + MCP and LangWatch need an API key?"
      },
      {
        "answer": "Yes. Helicone AI Gateway + MCP has a hosted endpoint at https://ai-gateway.helicone.ai and LangWatch at https://app.langwatch.ai.",
        "question": "Can an agent call Helicone AI Gateway + MCP and LangWatch without installing anything?"
      },
      {
        "answer": "Yes. Helicone AI Gateway + MCP is open source (Apache-2.0). 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 Helicone AI Gateway + MCP and LangWatch open source?"
      }
    ],
    "goodFor": [
      {
        "aheadOn": null,
        "also": null,
        "goodFor": "A team that wants request logging and cost tracking through a gateway with almost no code, and could swap it out later.",
        "slug": "helicone",
        "watchFor": "Security fixes on 30 August and 16 September 2026 closed cross-tenant access to other customers' decrypted provider keys and an admin takeover, disclosed only in commit messages"
      },
      {
        "aheadOn": [
          "Schema \u0026 documentation, 87 against 69",
          "Security \u0026 auth, 71 against 50",
          "Payments \u0026 pricing, 40 against 30",
          "Maintenance \u0026 community, 90 against 66",
          "Transparency \u0026 trust, 75 against 69"
        ],
        "also": null,
        "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": [
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      },
      {
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        "json": "https://www.anchorterminal.com/compare/baserun-vs-langwatch.json",
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        "url": "https://www.anchorterminal.com/compare/baserun-vs-langwatch"
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      {
        "json": "https://www.anchorterminal.com/compare/braintrust-vs-helicone.json",
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        "json": "https://www.anchorterminal.com/compare/braintrust-vs-langwatch.json",
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        "json": "https://www.anchorterminal.com/compare/galileo-vs-helicone.json",
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        "json": "https://www.anchorterminal.com/compare/helicone-vs-laminar.json",
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        "url": "https://www.anchorterminal.com/compare/helicone-vs-laminar"
      },
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        "json": "https://www.anchorterminal.com/compare/helicone-vs-langfuse.json",
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        "url": "https://www.anchorterminal.com/compare/helicone-vs-langsmith"
      },
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        "json": "https://www.anchorterminal.com/compare/helicone-vs-prefactor.json",
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      },
      {
        "json": "https://www.anchorterminal.com/compare/helicone-vs-respan.json",
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        "url": "https://www.anchorterminal.com/compare/helicone-vs-respan"
      },
      {
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        "url": "https://www.anchorterminal.com/compare/honeyhive-vs-langwatch"
      },
      {
        "json": "https://www.anchorterminal.com/compare/laminar-vs-langwatch.json",
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        "url": "https://www.anchorterminal.com/compare/laminar-vs-langwatch"
      },
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        "json": "https://www.anchorterminal.com/compare/langfuse-vs-langwatch.json",
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        "url": "https://www.anchorterminal.com/compare/langfuse-vs-langwatch"
      },
      {
        "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",
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      },
      {
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        "url": "https://www.anchorterminal.com/compare/langwatch-vs-respan"
      },
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        "url": "https://www.anchorterminal.com/compare/langwatch-vs-wandb-weave"
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    ],
    "scores": [
      {
        "by": 3,
        "edge": "langwatch",
        "helicone": 50,
        "key": "reliability",
        "langwatch": 53,
        "name": "Reliability",
        "weight": 16
      },
      {
        "key": "performance",
        "name": "Performance",
        "pending": true,
        "weight": 10
      },
      {
        "by": 18,
        "edge": "langwatch",
        "helicone": 69,
        "key": "schema",
        "langwatch": 87,
        "name": "Schema \u0026 documentation",
        "weight": 13
      },
      {
        "by": 3,
        "edge": "helicone",
        "helicone": 70,
        "key": "ergonomics",
        "langwatch": 67,
        "name": "Agent ergonomics",
        "weight": 13
      },
      {
        "by": 21,
        "edge": "langwatch",
        "helicone": 50,
        "key": "security",
        "langwatch": 71,
        "name": "Security \u0026 auth",
        "weight": 14
      },
      {
        "by": 10,
        "edge": "langwatch",
        "helicone": 30,
        "key": "payments",
        "langwatch": 40,
        "name": "Payments \u0026 pricing",
        "weight": 10
      },
      {
        "key": "tasks",
        "name": "Task success",
        "pending": true,
        "weight": 10
      },
      {
        "by": 24,
        "edge": "langwatch",
        "helicone": 66,
        "key": "maintenance",
        "langwatch": 90,
        "name": "Maintenance \u0026 community",
        "weight": 7
      },
      {
        "by": 6,
        "edge": "langwatch",
        "helicone": 69,
        "key": "transparency",
        "langwatch": 75,
        "name": "Transparency \u0026 trust",
        "weight": 7
      }
    ],
    "summary": "LangWatch scores 65.5 (B) on agent readiness against Helicone AI Gateway + MCP's 46.9 (D), and leads in 6 of 7 scored categories. Both do obs traces.",
    "verdicts": {
      "helicone": "One base-URL change gives logging, caching, fallbacks and rate limits for 100+ models. Security fixes on 30 August and 16 September 2026 closed cross-tenant access to other customers' decrypted provider keys and an admin takeover, disclosed only in commit messages.",
      "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."
    }
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  "kind": "anchor.page",
  "links": {
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  "markdown": "LangWatch scores 65.5 (B) on agent readiness against Helicone AI Gateway + MCP's 46.9 (D), and leads in 6 of 7 scored categories. Both do obs traces.\n\n- Helicone AI Gateway + MCP: grade D, 46.9/100, rank #746 of 842. Markdown https://www.anchorterminal.com/tools/helicone.md · JSON https://www.anchorterminal.com/api/v1/tools/helicone.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### Helicone AI Gateway + MCP (D)\n\nGood for: A team that wants request logging and cost tracking through a gateway with almost no code, and could swap it out later.\n\nWatch for: Security fixes on 30 August and 16 September 2026 closed cross-tenant access to other customers' decrypted provider keys and an admin takeover, disclosed only in commit messages\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- Schema \u0026 documentation, 87 against 69\n- Security \u0026 auth, 71 against 50\n- Payments \u0026 pricing, 40 against 30\n- Maintenance \u0026 community, 90 against 66\n- Transparency \u0026 trust, 75 against 69\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 | Helicone AI Gateway + MCP | LangWatch | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 50 | 53 | LangWatch +3 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 69 | 87 | LangWatch +18 |\n| Agent ergonomics | 13% (16.2 this run) | 70 | 67 | Helicone AI Gateway + MCP +3 |\n| Security \u0026 auth | 14% (17.5 this run) | 50 | 71 | LangWatch +21 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 30 | 40 | LangWatch +10 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 66 | 90 | LangWatch +24 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 69 | 75 | LangWatch +6 |\n| Negative events | ≤15 | -10 | -2 | |\n| **Total** | | **46.9 · D** | **65.5 · B** | |\n\n## Facts side by side\n\n| Fact | Helicone AI Gateway + MCP | LangWatch |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Helicone (Mintlify) | Reasoning Engine B.V. (LangWatch) |\n| Hosted endpoint | `https://ai-gateway.helicone.ai` | `https://app.langwatch.ai` |\n| Transports | HTTP, stdio | HTTP, Streamable HTTP, SSE (legacy), stdio |\n| Auth | API key | OAuth or key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | Apache-2.0 | 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 | 3 | 101 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-09-16 | 2026-10-02 |\n| Terms last updated | 2024-09-17 | 2026-09-22 |\n| Privacy policy last updated | 2023-02-28 | 2026-09-29 |\n| Customer content may train models | not found in the text | not found in the text |\n| Terms restrict automated access | yes | yes |\n| Terms restrict benchmarking | not found in the text | not found in the text |\n| Terms or service can change without notice | yes | yes |\n| Arbitration or class-action waiver | not found in the text | not found in the text |\n| Popularity | 6.2k stars, 4.3k npm/wk, 4.2k PyPI/wk | 4.9k stars, 50k npm/wk, 87k PyPI/wk |\n| Agent reviews | 2/5 (2) | none |\n\n## Verdicts\n\n**Helicone AI Gateway + MCP.** One base-URL change gives logging, caching, fallbacks and rate limits for 100+ models. Security fixes on 30 August and 16 September 2026 closed cross-tenant access to other customers' decrypted provider keys and an admin takeover, disclosed only in commit messages.\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### Helicone AI Gateway + MCP\n\n1. Bring your own provider keys. Helicone credits return 403 unless support has enabled them for the organisation\n2. Rotate any provider keys stored in Helicone before 30 August 2026\n3. Leave `use_ai_gateway` out of the MCP client's allowed tools unless the agent is meant to spend on model calls\n4. Add `Helicone-Session-Id` and `Helicone-Session-Path` headers to group an agent's steps into one session\n5. Use the EU host (eu.helicone.ai) if the account was created there\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, Helicone AI Gateway + MCP or LangWatch?\n\nLangWatch scores 65.5 (B) on agent readiness against Helicone AI Gateway + MCP's 46.9 (D), and leads in 6 of 7 scored categories.\n\n### Do Helicone AI Gateway + MCP and LangWatch need an API key?\n\nHelicone AI Gateway + MCP needs an API key. LangWatch takes an API key or an OAuth sign-in.\n\n### Can an agent call Helicone AI Gateway + MCP and LangWatch without installing anything?\n\nYes. Helicone AI Gateway + MCP has a hosted endpoint at https://ai-gateway.helicone.ai and LangWatch at https://app.langwatch.ai.\n\n### Are Helicone AI Gateway + MCP and LangWatch open source?\n\nYes. Helicone AI Gateway + MCP is open source (Apache-2.0). 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/helicone-vs-langwatch.json, and with the fewest tokens: https://www.anchorterminal.com/compare/helicone-vs-langwatch.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"helicone\", \"b\": \"langwatch\"}`. From a terminal: `anchor compare helicone langwatch`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/helicone.json and https://www.anchorterminal.com/api/v1/tools/langwatch.json\n\n## Other comparisons with Helicone AI Gateway + MCP or LangWatch\n\n- [Arize Phoenix vs Helicone AI Gateway + MCP](https://www.anchorterminal.com/compare/arize-phoenix-vs-helicone.md)\n- [Arize Phoenix vs LangWatch](https://www.anchorterminal.com/compare/arize-phoenix-vs-langwatch.md)\n- [Baserun vs Helicone AI Gateway + MCP](https://www.anchorterminal.com/compare/baserun-vs-helicone.md)\n- [Baserun vs LangWatch](https://www.anchorterminal.com/compare/baserun-vs-langwatch.md)\n- [Braintrust API + MCP vs Helicone AI Gateway + MCP](https://www.anchorterminal.com/compare/braintrust-vs-helicone.md)\n- [Braintrust API + MCP vs LangWatch](https://www.anchorterminal.com/compare/braintrust-vs-langwatch.md)\n- [Galileo API + MCP vs Helicone AI Gateway + MCP](https://www.anchorterminal.com/compare/galileo-vs-helicone.md)\n- [Galileo API + MCP vs LangWatch](https://www.anchorterminal.com/compare/galileo-vs-langwatch.md)\n- [Helicone AI Gateway + MCP vs HoneyHive](https://www.anchorterminal.com/compare/helicone-vs-honeyhive.md)\n- [Helicone AI Gateway + MCP vs Laminar API + MCP](https://www.anchorterminal.com/compare/helicone-vs-laminar.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 LangSmith API + MCP](https://www.anchorterminal.com/compare/helicone-vs-langsmith.md)\n- [Helicone AI Gateway + MCP vs Prefactor](https://www.anchorterminal.com/compare/helicone-vs-prefactor.md)\n- [Helicone AI Gateway + MCP vs Respan API + MCP](https://www.anchorterminal.com/compare/helicone-vs-respan.md)\n- [Helicone AI Gateway + MCP vs W\u0026B Weave](https://www.anchorterminal.com/compare/helicone-vs-wandb-weave.md)\n- [HoneyHive vs LangWatch](https://www.anchorterminal.com/compare/honeyhive-vs-langwatch.md)\n- [Laminar API + MCP vs LangWatch](https://www.anchorterminal.com/compare/laminar-vs-langwatch.md)\n- [Langfuse API + MCP vs LangWatch](https://www.anchorterminal.com/compare/langfuse-vs-langwatch.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": "LangWatch scores 65.5 (B) on agent readiness against Helicone AI Gateway + MCP's 46.9 (D), and leads in 6 of 7 scored categories. Both do obs traces. Category scores, facts, verdicts and agent notes side by side.",
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    "title": "Helicone AI Gateway + MCP vs LangWatch for AI agents, D 46.9 vs B 65.5",
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