{
  "data": {
    "a": {
      "slug": "braintrust",
      "name": "Braintrust API + MCP",
      "vendor": "Braintrust",
      "vendorUrl": "https://www.braintrust.dev",
      "kind": "http-api",
      "category": "agent-observability",
      "summary": "Hosted tracing, logging and evaluation for LLM apps and agents, with experiments, datasets, prompts, online scorers and a model gateway.",
      "url": "https://www.anchorterminal.com/tools/braintrust",
      "markdownUrl": "https://www.anchorterminal.com/tools/braintrust.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/braintrust.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/braintrust.json",
      "repo": "https://github.com/braintrustdata/braintrust-sdk-javascript",
      "license": "Apache-2.0 (SDKs only, platform closed source)",
      "transports": [
        "http",
        "streamable-http"
      ],
      "remoteUrl": "https://api.braintrust.dev/v1",
      "packages": [
        {
          "registry": "npm",
          "name": "braintrust"
        },
        {
          "registry": "pypi",
          "name": "braintrust"
        }
      ],
      "auth": "mixed",
      "authNotes": "REST API and SDKs take an org API key as a Bearer token (BRAINTRUST_API_KEY). The hosted MCP server accepts OAuth 2.0 with dynamic client registration or the same API key, and acts with the permissions of the key's account. EU and self-hosted data planes have their own API and MCP URLs.",
      "pricing": "freemium",
      "pricingNotes": "Starter is free with no card, unlimited users, 1 GB processed data and 10,000 scores a month, 14-day retention and $10 of model credit. Overage $4 a GB and $2.50 per 1,000 scores. Pro $249 a month with 5 GB, 50,000 scores, $100 of model credit and 30-day retention, then $3 a GB, $1.50 per 1,000 scores and $0.50 a GB a month for longer retention. Qualifying startups can get Pro free for 6 to 12 months. Enterprise is custom and adds on-prem or hybrid deployment, a BAA and SLAs (https://www.braintrust.dev/pricing).",
      "priceSummary": "$249 / mo",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402 support in docs or pricing (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": 42,
      "popularity": {
        "githubStars": null,
        "npmWeekly": 2018529,
        "pypiWeekly": 1701906,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://www.braintrust.dev/docs",
      "llmsTxt": "https://www.braintrust.dev/docs/llms.txt",
      "openapi": "https://www.braintrust.dev/docs/openapi.json",
      "registryName": "io.github.braintrustdata/braintrust",
      "capabilities": [
        "obs.traces",
        "obs.evals",
        "obs.prompts",
        "obs.gateway",
        "obs.datasets"
      ],
      "tags": [
        "hosted",
        "freemium",
        "no-card",
        "mcp",
        "llms-txt",
        "openapi",
        "python",
        "typescript",
        "closed-source",
        "enterprise"
      ],
      "lastRelease": "2026-10-01",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 61.1,
        "grade": "C",
        "agentReady": false,
        "rank": 433,
        "ranked": true,
        "rankOf": 842,
        "categoryRank": 8,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 66,
          "maintenance": 85,
          "payments": 40,
          "reliability": 61,
          "schema": 85,
          "security": 58,
          "transparency": 66
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": -4,
        "negativeNotes": [
          "Fixed 2026-07-16. The Python SDK's LiteLLM instrumentation in versions 0.2.0 to 0.27.x wrote provider credentials into trace metadata, among them API keys, `Authorization` headers, Azure tokens and AWS access and secret keys. Fixed in 0.28.0 with a metadata allowlist, and a knowledge-base page tells users to rotate. It reads as an advisory but isn't filed as one and carries no date. -2 after decay (https://braintrust.dev/docs/kb/litellm-instrumentation-may-record-provider-credentials.md)",
          "Fixed 2026-07-16. The TypeScript SDK from 0.4.0 to 3.23.0 recorded API keys passed to the Claude Agent SDK through `options.apiKey` into trace metadata. The 3.23.1 changelog line calls the fix \"Clean up span metadata\", and only the knowledge-base page explains the exposure and asks for rotation. -2 after decay (https://braintrust.dev/docs/kb/claude-agent-sdk-api-keys-recorded-in-trace-metadata.md)"
        ],
        "verdict": "OpenAPI 3.0.3 spec with 75 paths, 429 and `Retry-After` declared on 154 operations. Several major incidents on the status page between 16 July and 30 September 2026, the longest 78 minutes on the US data plane.",
        "bestFor": "Teams that want evals, datasets and production logs in one hosted product and will drive it from a coding agent through MCP or SQL.",
        "strengths": [
          "OpenAPI 3.0.3 spec with 75 paths, 429 and `Retry-After` declared on 154 operations",
          "Hosted MCP server with 42 tools, OAuth 2.0 or API key, and `sql_query` that hands results over 1 MB back as a signed URL",
          "Service tokens can be scoped to single projects through permission groups on every plan",
          "Starter is free with no card, unlimited users and published per-GB and per-score overage prices",
          "TypeScript and Python SDKs both released on 2026-10-01, with 34 releases between them since 16 July"
        ],
        "weaknesses": [
          "Several major incidents on the status page between 16 July and 30 September 2026, the longest 78 minutes on the US data plane",
          "Python SDK up to 0.27.x and TypeScript SDK up to 3.23.0 recorded provider credentials in trace metadata, fixed on 2026-07-16 without a formal advisory",
          "All 42 MCP tools load by default and write tools act with the full permissions of the signed-in account",
          "Only BTQL has a published rate limit, about 20 queries a minute on Starter and Pro",
          "Privacy notice dates from September 2023 and excludes customer data. Starter keeps data for 14 days"
        ],
        "agentNotes": [
          "Connect a project-scoped service token rather than a personal key, because MCP write tools act with the key's full permissions",
          "Set the client to confirm MCP write tools such as `edit_dataset_rows` and `create_threshold_alert`. The server has no read-only mode",
          "Cache `sql_query` results. Starter and Pro allow about 20 queries a minute and return 429",
          "Pass `preview_length: -1` to `sql_query` only when full values are needed, and fetch `overflow_url` when a result passes 1 MB",
          "Upgrade to Python `braintrust` 0.28.0 or TypeScript 3.23.1 or later and rotate any provider keys traced before July 2026"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 3,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "C",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 61.1
          }
        ],
        "editorialScores": {
          "ergonomics": 66,
          "maintenance": 85,
          "payments": 40,
          "reliability": 61,
          "schema": 85,
          "security": 58,
          "transparency": 50
        },
        "provenanceScore": 81
      },
      "connect": {
        "http": "curl https://api.braintrust.dev/v1/project -H \"Authorization: Bearer $BRAINTRUST_API_KEY\"",
        "claudeCode": "claude mcp add --transport http braintrust https://api.braintrust.dev/mcp",
        "config": {
          "mcpServers": {
            "braintrust": {
              "headers": {
                "Authorization": "Bearer ${BRAINTRUST_API_KEY}"
              },
              "type": "http",
              "url": "https://api.braintrust.dev/mcp"
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/obs.traces",
        "tool": "https://letme.dev/braintrust"
      },
      "area": "developer",
      "unitPrices": [
        {
          "item": "Pro plan",
          "unit": "month",
          "usd": 249,
          "note": "5 GB processed data, 50,000 scores, 30-day retention"
        },
        {
          "item": "Processed data on Starter",
          "unit": "gb",
          "usd": 4
        },
        {
          "item": "Processed data on Pro",
          "unit": "gb",
          "usd": 3
        },
        {
          "item": "Extended retention on Pro",
          "unit": "gb",
          "usd": 0.5,
          "note": "per GB a month beyond 30 days"
        }
      ],
      "provenance": {
        "legalEntity": "Braintrust Data, Inc.",
        "domain": "braintrust.dev",
        "domainRegistered": "2021-03-25",
        "endpointOnVendorDomain": true,
        "terms": "https://www.braintrust.dev/legal/terms-of-service",
        "privacy": "https://www.braintrust.dev/legal/privacy-policy",
        "statusPage": "https://status.braintrust.dev",
        "changelog": "https://www.braintrust.dev/docs/changelog",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "score": 81
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/braintrust.json",
      "live": {
        "slug": "braintrust",
        "probe": {
          "target": "https://api.braintrust.dev/v1",
          "method": "get",
          "lastAt": "2026-10-09T09:26:45.153997357Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 110,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 99.83,
          "p50ms24h": 107,
          "p95ms24h": 160,
          "samples24h": 261,
          "samples30d": 2287,
          "days": [
            {
              "date": "2026-09-30",
              "probes": 35,
              "ok": 34
            },
            {
              "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": 271
            },
            {
              "date": "2026-10-05",
              "probes": 272,
              "ok": 271
            },
            {
              "date": "2026-10-06",
              "probes": 272,
              "ok": 271
            },
            {
              "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.braintrust.dev",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-09T09:24:54.81460581Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "braintrustdata/braintrust-sdk-javascript",
            "version": "braintrust@3.37.1",
            "released": "2026-10-07",
            "seenAt": "2026-10-08T16:03:30.629547029Z"
          },
          {
            "registry": "mcp-registry",
            "name": "io.github.braintrustdata/braintrust",
            "version": "1.0.0",
            "seenAt": "2026-10-09T02:57:46.004536428Z"
          },
          {
            "registry": "npm",
            "name": "braintrust",
            "version": "3.37.1",
            "seenAt": "2026-10-08T16:03:24.85315191Z"
          },
          {
            "registry": "pypi",
            "name": "braintrust",
            "version": "0.45.0",
            "released": "2026-10-07",
            "seenAt": "2026-10-08T16:03:26.737027281Z"
          }
        ],
        "githubStars": 28,
        "npmWeekly": 2046537,
        "pypiWeekly": 1607066,
        "securityTxt": {
          "url": "https://braintrust.dev/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-08T15:39:07.143527167Z"
        },
        "llmsTxt": {
          "url": "https://www.braintrust.dev/docs/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-08T14:00:09.059767549Z"
        },
        "domain": {
          "domain": "braintrust.dev",
          "registered": "2021-03-25",
          "source": "https://pubapi.registry.google/rdap/domain/braintrust.dev",
          "checkedAt": "2026-10-04T13:08:21.062714804Z"
        },
        "pages": [
          {
            "url": "https://www.braintrust.dev/docs/changelog",
            "kind": "changelog",
            "status": 200,
            "checkedAt": "2026-10-08T18:26:40.036409822Z",
            "changedAt": "2026-10-08T18:26:40.036409822Z",
            "fingerprint": "496bcdb8e54f"
          },
          {
            "url": "https://www.braintrust.dev/pricing",
            "kind": "pricing",
            "status": 200,
            "checkedAt": "2026-10-08T18:26:46.642292163Z",
            "changedAt": "2026-10-08T18:26:46.642292163Z",
            "fingerprint": "5d374bff4552"
          },
          {
            "url": "https://www.braintrust.dev/legal/privacy-policy",
            "kind": "privacy",
            "status": 200,
            "checkedAt": "2026-10-08T18:26:42.432950997Z",
            "changedAt": "2026-10-08T18:26:42.432950997Z",
            "fingerprint": "11f705ad4b2e"
          },
          {
            "url": "https://www.braintrust.dev/legal/terms-of-service",
            "kind": "terms",
            "status": 200,
            "checkedAt": "2026-10-08T18:26:44.659338097Z",
            "changedAt": "2026-10-08T18:26:44.659338097Z",
            "fingerprint": "d1ceea73697f"
          }
        ],
        "updatedAt": "2026-10-09T09:26:45.153997357Z"
      }
    },
    "answer": "LangWatch scores 65.5 (B) on agent readiness against Braintrust API + MCP's 61.1 (C), and leads in 5 of 7 scored categories. Braintrust API + MCP leads on reliability.",
    "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": "Braintrust",
        "b": "Reasoning Engine B.V. (LangWatch)",
        "name": "Vendor"
      },
      {
        "a": "https://api.braintrust.dev/v1",
        "b": "https://app.langwatch.ai",
        "name": "Hosted endpoint"
      },
      {
        "a": "HTTP, Streamable HTTP",
        "b": "HTTP, Streamable HTTP, SSE (legacy), stdio",
        "name": "Transports"
      },
      {
        "a": "OAuth or key",
        "b": "OAuth or key",
        "name": "Auth"
      },
      {
        "a": "Freemium",
        "b": "Freemium",
        "name": "Pricing"
      },
      {
        "a": "no",
        "b": "no",
        "name": "x402"
      },
      {
        "a": "Apache-2.0 (SDKs only, platform closed source)",
        "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": "42",
        "b": "101",
        "name": "Tools exposed"
      },
      {
        "a": "yes",
        "b": "no",
        "name": "Read-only variant documented"
      },
      {
        "a": "yes",
        "b": "yes",
        "name": "llms.txt"
      },
      {
        "a": "io.github.braintrustdata/braintrust",
        "b": "not listed",
        "name": "MCP registry"
      },
      {
        "a": "2026-10-01",
        "b": "2026-10-02",
        "name": "Last release"
      },
      {
        "a": "2026-07-07",
        "b": "2026-09-22",
        "name": "Terms last updated"
      },
      {
        "a": "2023-09-21",
        "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": "yes",
        "b": "not found in the text",
        "name": "Arbitration or class-action waiver"
      },
      {
        "a": "2M npm/wk, 1.7M PyPI/wk",
        "b": "4.9k stars, 50k npm/wk, 87k PyPI/wk",
        "name": "Popularity"
      },
      {
        "a": "3/5 (2)",
        "b": "none",
        "name": "Agent reviews"
      }
    ],
    "faq": [
      {
        "answer": "LangWatch scores 65.5 (B) on agent readiness against Braintrust API + MCP's 61.1 (C), and leads in 5 of 7 scored categories. Braintrust API + MCP leads on reliability.",
        "question": "Which is better for AI agents, Braintrust API + MCP or LangWatch?"
      },
      {
        "answer": "Both take an API key or an OAuth sign-in.",
        "question": "Do Braintrust API + MCP and LangWatch need an API key?"
      },
      {
        "answer": "Yes. Braintrust API + MCP has a hosted endpoint at https://api.braintrust.dev/v1 and LangWatch at https://app.langwatch.ai.",
        "question": "Can an agent call Braintrust API + MCP and LangWatch without installing anything?"
      },
      {
        "answer": "No open-source release is listed for Braintrust API + MCP. 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 Braintrust API + MCP and LangWatch open source?"
      }
    ],
    "goodFor": [
      {
        "aheadOn": [
          "Reliability, 61 against 53"
        ],
        "also": null,
        "goodFor": "Teams that want evals, datasets and production logs in one hosted product and will drive it from a coding agent through MCP or SQL.",
        "slug": "braintrust",
        "watchFor": "Several major incidents on the status page between 16 July and 30 September 2026, the longest 78 minutes on the US data plane"
      },
      {
        "aheadOn": [
          "Security \u0026 auth, 71 against 58",
          "Maintenance \u0026 community, 90 against 85",
          "Transparency \u0026 trust, 75 against 66"
        ],
        "also": [
          "Runs on your own machine",
          "Open source"
        ],
        "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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        "json": "https://www.anchorterminal.com/compare/arize-phoenix-vs-braintrust.json",
        "title": "Arize Phoenix vs Braintrust API + MCP",
        "url": "https://www.anchorterminal.com/compare/arize-phoenix-vs-braintrust"
      },
      {
        "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-braintrust.json",
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        "url": "https://www.anchorterminal.com/compare/baserun-vs-braintrust"
      },
      {
        "json": "https://www.anchorterminal.com/compare/baserun-vs-langwatch.json",
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        "url": "https://www.anchorterminal.com/compare/baserun-vs-langwatch"
      },
      {
        "json": "https://www.anchorterminal.com/compare/braintrust-vs-galileo.json",
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        "url": "https://www.anchorterminal.com/compare/braintrust-vs-galileo"
      },
      {
        "json": "https://www.anchorterminal.com/compare/braintrust-vs-helicone.json",
        "title": "Braintrust API + MCP vs Helicone AI Gateway + MCP",
        "url": "https://www.anchorterminal.com/compare/braintrust-vs-helicone"
      },
      {
        "json": "https://www.anchorterminal.com/compare/braintrust-vs-honeyhive.json",
        "title": "Braintrust API + MCP vs HoneyHive",
        "url": "https://www.anchorterminal.com/compare/braintrust-vs-honeyhive"
      },
      {
        "json": "https://www.anchorterminal.com/compare/braintrust-vs-laminar.json",
        "title": "Braintrust API + MCP vs Laminar API + MCP",
        "url": "https://www.anchorterminal.com/compare/braintrust-vs-laminar"
      },
      {
        "json": "https://www.anchorterminal.com/compare/braintrust-vs-langfuse.json",
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        "url": "https://www.anchorterminal.com/compare/braintrust-vs-langfuse"
      },
      {
        "json": "https://www.anchorterminal.com/compare/braintrust-vs-langsmith.json",
        "title": "Braintrust API + MCP vs LangSmith API + MCP",
        "url": "https://www.anchorterminal.com/compare/braintrust-vs-langsmith"
      },
      {
        "json": "https://www.anchorterminal.com/compare/braintrust-vs-prefactor.json",
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        "url": "https://www.anchorterminal.com/compare/braintrust-vs-prefactor"
      },
      {
        "json": "https://www.anchorterminal.com/compare/braintrust-vs-respan.json",
        "title": "Braintrust API + MCP vs Respan API + MCP",
        "url": "https://www.anchorterminal.com/compare/braintrust-vs-respan"
      },
      {
        "json": "https://www.anchorterminal.com/compare/braintrust-vs-wandb-weave.json",
        "title": "Braintrust API + MCP vs W\u0026B Weave",
        "url": "https://www.anchorterminal.com/compare/braintrust-vs-wandb-weave"
      },
      {
        "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-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-langwatch.json",
        "title": "HoneyHive vs LangWatch",
        "url": "https://www.anchorterminal.com/compare/honeyhive-vs-langwatch"
      },
      {
        "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-langwatch.json",
        "title": "Langfuse API + MCP vs LangWatch",
        "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",
        "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"
      }
    ],
    "scores": [
      {
        "braintrust": 61,
        "by": 8,
        "edge": "braintrust",
        "key": "reliability",
        "langwatch": 53,
        "name": "Reliability",
        "weight": 16
      },
      {
        "key": "performance",
        "name": "Performance",
        "pending": true,
        "weight": 10
      },
      {
        "braintrust": 85,
        "by": 2,
        "edge": "langwatch",
        "key": "schema",
        "langwatch": 87,
        "name": "Schema \u0026 documentation",
        "weight": 13
      },
      {
        "braintrust": 66,
        "by": 1,
        "edge": "langwatch",
        "key": "ergonomics",
        "langwatch": 67,
        "name": "Agent ergonomics",
        "weight": 13
      },
      {
        "braintrust": 58,
        "by": 13,
        "edge": "langwatch",
        "key": "security",
        "langwatch": 71,
        "name": "Security \u0026 auth",
        "weight": 14
      },
      {
        "braintrust": 40,
        "by": 0,
        "edge": "",
        "key": "payments",
        "langwatch": 40,
        "name": "Payments \u0026 pricing",
        "weight": 10
      },
      {
        "key": "tasks",
        "name": "Task success",
        "pending": true,
        "weight": 10
      },
      {
        "braintrust": 85,
        "by": 5,
        "edge": "langwatch",
        "key": "maintenance",
        "langwatch": 90,
        "name": "Maintenance \u0026 community",
        "weight": 7
      },
      {
        "braintrust": 66,
        "by": 9,
        "edge": "langwatch",
        "key": "transparency",
        "langwatch": 75,
        "name": "Transparency \u0026 trust",
        "weight": 7
      }
    ],
    "summary": "LangWatch scores 65.5 (B) on agent readiness against Braintrust API + MCP's 61.1 (C), and leads in 5 of 7 scored categories. Braintrust API + MCP leads on reliability. Both do obs traces.",
    "verdicts": {
      "braintrust": "OpenAPI 3.0.3 spec with 75 paths, 429 and `Retry-After` declared on 154 operations. Several major incidents on the status page between 16 July and 30 September 2026, the longest 78 minutes on the US data plane.",
      "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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    "html": "https://www.anchorterminal.com/compare/braintrust-vs-langwatch",
    "json": "https://www.anchorterminal.com/compare/braintrust-vs-langwatch.json",
    "llms": "https://www.anchorterminal.com/llms.txt",
    "markdown": "https://www.anchorterminal.com/compare/braintrust-vs-langwatch.md",
    "slim": "https://www.anchorterminal.com/compare/braintrust-vs-langwatch.min.md"
  },
  "markdown": "LangWatch scores 65.5 (B) on agent readiness against Braintrust API + MCP's 61.1 (C), and leads in 5 of 7 scored categories. Braintrust API + MCP leads on reliability. Both do obs traces.\n\n- Braintrust API + MCP: grade C, 61.1/100, rank #433 of 842. Markdown https://www.anchorterminal.com/tools/braintrust.md · JSON https://www.anchorterminal.com/api/v1/tools/braintrust.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### Braintrust API + MCP (C)\n\nGood for: Teams that want evals, datasets and production logs in one hosted product and will drive it from a coding agent through MCP or SQL.\n\nAhead on:\n- Reliability, 61 against 53\n\nWatch for: Several major incidents on the status page between 16 July and 30 September 2026, the longest 78 minutes on the US data plane\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 58\n- Maintenance \u0026 community, 90 against 85\n- Transparency \u0026 trust, 75 against 66\n\nAlso in its favour:\n- Runs on your own machine\n- Open source\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 | Braintrust API + MCP | LangWatch | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 61 | 53 | Braintrust API + MCP +8 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 85 | 87 | LangWatch +2 |\n| Agent ergonomics | 13% (16.2 this run) | 66 | 67 | LangWatch +1 |\n| Security \u0026 auth | 14% (17.5 this run) | 58 | 71 | LangWatch +13 |\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) | 85 | 90 | LangWatch +5 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 66 | 75 | LangWatch +9 |\n| Negative events | ≤15 | -4 | -2 | |\n| **Total** | | **61.1 · C** | **65.5 · B** | |\n\n## Facts side by side\n\n| Fact | Braintrust API + MCP | LangWatch |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Braintrust | Reasoning Engine B.V. (LangWatch) |\n| Hosted endpoint | `https://api.braintrust.dev/v1` | `https://app.langwatch.ai` |\n| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP, SSE (legacy), stdio |\n| Auth | OAuth or key | OAuth or key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | Apache-2.0 (SDKs only, platform closed 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| Tools exposed | 42 | 101 |\n| Read-only variant documented | yes | no |\n| llms.txt | yes | yes |\n| MCP registry | `io.github.braintrustdata/braintrust` | not listed |\n| Last release | 2026-10-01 | 2026-10-02 |\n| Terms last updated | 2026-07-07 | 2026-09-22 |\n| Privacy policy last updated | 2023-09-21 | 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 | yes | not found in the text |\n| Popularity | 2M npm/wk, 1.7M PyPI/wk | 4.9k stars, 50k npm/wk, 87k PyPI/wk |\n| Agent reviews | 3/5 (2) | none |\n\n## Verdicts\n\n**Braintrust API + MCP.** OpenAPI 3.0.3 spec with 75 paths, 429 and `Retry-After` declared on 154 operations. Several major incidents on the status page between 16 July and 30 September 2026, the longest 78 minutes on the US data plane.\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### Braintrust API + MCP\n\n1. Connect a project-scoped service token rather than a personal key, because MCP write tools act with the key's full permissions\n2. Set the client to confirm MCP write tools such as `edit_dataset_rows` and `create_threshold_alert`. The server has no read-only mode\n3. Cache `sql_query` results. Starter and Pro allow about 20 queries a minute and return 429\n4. Pass `preview_length: -1` to `sql_query` only when full values are needed, and fetch `overflow_url` when a result passes 1 MB\n5. Upgrade to Python `braintrust` 0.28.0 or TypeScript 3.23.1 or later and rotate any provider keys traced before July 2026\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, Braintrust API + MCP or LangWatch?\n\nLangWatch scores 65.5 (B) on agent readiness against Braintrust API + MCP's 61.1 (C), and leads in 5 of 7 scored categories. Braintrust API + MCP leads on reliability.\n\n### Do Braintrust API + MCP and LangWatch need an API key?\n\nBoth take an API key or an OAuth sign-in.\n\n### Can an agent call Braintrust API + MCP and LangWatch without installing anything?\n\nYes. Braintrust API + MCP has a hosted endpoint at https://api.braintrust.dev/v1 and LangWatch at https://app.langwatch.ai.\n\n### Are Braintrust API + MCP and LangWatch open source?\n\nNo open-source release is listed for Braintrust API + MCP. 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/braintrust-vs-langwatch.json, and with the fewest tokens: https://www.anchorterminal.com/compare/braintrust-vs-langwatch.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"braintrust\", \"b\": \"langwatch\"}`. From a terminal: `anchor compare braintrust langwatch`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/braintrust.json and https://www.anchorterminal.com/api/v1/tools/langwatch.json\n\n## Other comparisons with Braintrust API + MCP or LangWatch\n\n- [Arize Phoenix vs Braintrust API + MCP](https://www.anchorterminal.com/compare/arize-phoenix-vs-braintrust.md)\n- [Arize Phoenix vs LangWatch](https://www.anchorterminal.com/compare/arize-phoenix-vs-langwatch.md)\n- [Baserun vs Braintrust API + MCP](https://www.anchorterminal.com/compare/baserun-vs-braintrust.md)\n- [Baserun vs LangWatch](https://www.anchorterminal.com/compare/baserun-vs-langwatch.md)\n- [Braintrust API + MCP vs Galileo API + MCP](https://www.anchorterminal.com/compare/braintrust-vs-galileo.md)\n- [Braintrust API + MCP vs Helicone AI Gateway + MCP](https://www.anchorterminal.com/compare/braintrust-vs-helicone.md)\n- [Braintrust API + MCP vs HoneyHive](https://www.anchorterminal.com/compare/braintrust-vs-honeyhive.md)\n- [Braintrust API + MCP vs Laminar API + MCP](https://www.anchorterminal.com/compare/braintrust-vs-laminar.md)\n- [Braintrust API + MCP vs Langfuse API + MCP](https://www.anchorterminal.com/compare/braintrust-vs-langfuse.md)\n- [Braintrust API + MCP vs LangSmith API + MCP](https://www.anchorterminal.com/compare/braintrust-vs-langsmith.md)\n- [Braintrust API + MCP vs Prefactor](https://www.anchorterminal.com/compare/braintrust-vs-prefactor.md)\n- [Braintrust API + MCP vs Respan API + MCP](https://www.anchorterminal.com/compare/braintrust-vs-respan.md)\n- [Braintrust API + MCP vs W\u0026B Weave](https://www.anchorterminal.com/compare/braintrust-vs-wandb-weave.md)\n- [Galileo API + MCP vs LangWatch](https://www.anchorterminal.com/compare/galileo-vs-langwatch.md)\n- [Helicone AI Gateway + MCP vs LangWatch](https://www.anchorterminal.com/compare/helicone-vs-langwatch.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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