{ "data": { "a": { "slug": "baserun", "name": "Baserun", "vendor": "Baserun", "vendorUrl": "https://baserun.ai", "kind": "http-api", "category": "agent-observability", "summary": "Discontinued LLM testing and monitoring platform with Python and JavaScript SDKs for tracing model calls.", "url": "https://www.anchorterminal.com/tools/baserun", "markdownUrl": "https://www.anchorterminal.com/tools/baserun.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/baserun.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/baserun.json", "transports": [ "http" ], "remoteUrl": "https://app.baserun.ai", "packages": [ { "registry": "pypi", "name": "baserun" }, { "registry": "npm", "name": "baserun" } ], "auth": "api-key", "authNotes": "`BASERUN_API_KEY` per project, read by the SDKs. No service is left to accept it.", "pricing": "freemium", "pricingNotes": "No longer sold. The last archived pricing page listed Starter free with 10,000 traces a month, 7 days of retention and 2 users, Pro $49 a seat with 100,000 traces then $10 per 10,000 and 30 days of retention, and Enterprise custom (https://web.archive.org/web/20240718042849/https://www.baserun.ai/pricing).", "priceSummary": "$49 / seat-mo", "where": "hosted", "x402": { "level": "no", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": 115, "pypiWeekly": 209, "asOf": "2026-09-30" }, "docsUrl": "https://docs.baserun.ai", "capabilities": [ "obs.traces", "obs.evals", "obs.prompts" ], "tags": [ "closed-source", "retired", "python", "typescript" ], "lastRelease": "2024-06-26", "graded": true, "anchor": { "graded": true, "score": 7, "grade": "F", "agentReady": false, "rank": 0, "ranked": false, "notRankedWhy": "Shut down 2024-09-30, so out of the ranking", "rankOf": 842, "categoryRank": 13, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 5, "maintenance": 0, "payments": 0, "reliability": 0, "schema": 15, "security": 5, "transparency": 33 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "high", "date": "2026-10-01" }, "negative": 0, "verdict": "SDKs were MIT licensed and the Python source is still public at github.com/baserun-ai/baserun-py. Service offline since late 2024. api.baserun.ai doesn't resolve and app.baserun.ai serves an expired certificate.", "strengths": [ "SDKs were MIT licensed and the Python source is still public at github.com/baserun-ai/baserun-py", "Docs remain readable at docs.baserun.ai, with an llms.txt index of 37 pages, for anyone migrating old code" ], "weaknesses": [ "Service offline since late 2024. api.baserun.ai doesn't resolve and app.baserun.ai serves an expired certificate", "No shutdown notice on the docs, the homepage or either package, and neither package is marked deprecated", "Python SDK defaults to https://app.baserun.ai, so old installs keep trying to send trace data there", "No announced data export, deletion statement or migration path", "Last SDK releases were PyPI 2.0.9 on 2024-06-26 and npm 2.1.3" ], "agentNotes": [ "Don't install `baserun` from PyPI or npm. Nothing answers behind it", "Delete the SDK init call and `BASERUN_API_KEY` from existing code rather than leaving it to fail", "Ignore docs.baserun.ai. It describes a service that no longer runs and doesn't say so" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 1, "history": [ { "basis": "public evidence", "confidence": "high", "grade": "F", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 7 } ], "editorialScores": { "ergonomics": 5, "maintenance": 0, "payments": 0, "reliability": 0, "schema": 15, "security": 5, "transparency": 10 }, "provenanceScore": 56 }, "connect": { "http": "# Retired. baserun.ai and api.baserun.ai no longer answer.\npip install baserun # or: npm i baserun" }, "letme": { "capability": "https://letme.dev/obs.traces", "tool": "https://letme.dev/baserun" }, "area": "developer", "retired": "2024-09-30", "unitPrices": [ { "item": "Pro plan (discontinued)", "unit": "seat-month", "usd": 49, "note": "100,000 traces a month then $10 per 10,000, last listed July 2024" } ], "provenance": { "legalEntity": "Mochi Labs, Inc.", "domain": "baserun.ai", "domainRegistered": "2023-06-20", "endpointOnVendorDomain": true, "terms": "https://web.archive.org/web/20240908185548/https://www.baserun.ai/terms", "privacy": "https://web.archive.org/web/20240908185719/https://www.baserun.ai/privacy", "statusPage": "", "changelog": "", "securityTxt": "none", "checked": "2026-10-01", "notes": [ "Legal entity from the SDK licence (MIT, copyright 2023 Mochi Labs, Inc.) on PyPI and in github.com/baserun-ai/baserun-py", "app.baserun.ai serves an expired certificate, api.baserun.ai doesn't resolve, and baserun.ai failed the TLS handshake for /.well-known/security.txt on 2026-10-01", "One fetch of www.baserun.ai on 2026-10-01 returned the old marketing copy with no dates, prices or working sign-in links" ], "score": 56 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/baserun.json" }, "answer": "LangWatch scores 65.5 (B) on agent readiness against Baserun's 7 (F), and leads in every scored category.", "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": "Baserun", "b": "Reasoning Engine B.V. (LangWatch)", "name": "Vendor" }, { "a": "https://app.baserun.ai", "b": "https://app.langwatch.ai", "name": "Hosted endpoint" }, { "a": "HTTP", "b": "HTTP, Streamable HTTP, SSE (legacy), stdio", "name": "Transports" }, { "a": "API key", "b": "OAuth or key", "name": "Auth" }, { "a": "Freemium", "b": "Freemium", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "none", "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": "none", "b": "101", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "no", "b": "yes", "name": "llms.txt" }, { "a": "2024-06-26", "b": "2026-10-02", "name": "Last release" }, { "a": "couldn't be read", "b": "2026-09-22", "name": "Terms last updated" }, { "a": "couldn't be read", "b": "2026-09-29", "name": "Privacy policy last updated" }, { "a": "couldn't be read", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "couldn't be read", "b": "yes", "name": "Terms restrict automated access" }, { "a": "couldn't be read", "b": "not found in the text", "name": "Terms restrict benchmarking" }, { "a": "couldn't be read", "b": "yes", "name": "Terms or service can change without notice" }, { "a": "couldn't be read", "b": "not found in the text", "name": "Arbitration or class-action waiver" }, { "a": "115 npm/wk, 209 PyPI/wk", "b": "4.9k stars, 50k npm/wk, 87k PyPI/wk", "name": "Popularity" }, { "a": "1/5 (2)", "b": "none", "name": "Agent reviews" } ], "faq": [ { "answer": "LangWatch scores 65.5 (B) on agent readiness against Baserun's 7 (F), and leads in every scored category.", "question": "Which is better for AI agents, Baserun or LangWatch?" }, { "answer": "Baserun needs an API key. LangWatch takes an API key or an OAuth sign-in.", "question": "Do Baserun and LangWatch need an API key?" }, { "answer": "Yes. Baserun has a hosted endpoint at https://app.baserun.ai and LangWatch at https://app.langwatch.ai.", "question": "Can an agent call Baserun and LangWatch without installing anything?" }, { "answer": "No open-source release is listed for Baserun. 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 Baserun and LangWatch open source?" } ], "goodFor": [ { "aheadOn": null, "also": null, "goodFor": "Nothing new. It shut down on 2024-09-30.", "slug": "baserun", "watchFor": "Service offline since late 2024. api.baserun.ai doesn't resolve and app.baserun.ai serves an expired certificate" }, { "aheadOn": [ "Reliability, 53 against 0", "Schema \u0026 documentation, 87 against 15", "Agent ergonomics, 67 against 5", "Security \u0026 auth, 71 against 5", "Payments \u0026 pricing, 40 against 0", "Maintenance \u0026 community, 90 against 0", "Transparency \u0026 trust, 75 against 33" ], "also": [ "Still running. Baserun has shut down", "Runs on your own machine", "Free to start without a card", "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": [ { "json": "https://www.anchorterminal.com/compare/arize-phoenix-vs-baserun.json", "title": "Arize Phoenix vs Baserun", "url": "https://www.anchorterminal.com/compare/arize-phoenix-vs-baserun" }, { "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", "title": "Baserun vs Braintrust API + MCP", "url": "https://www.anchorterminal.com/compare/baserun-vs-braintrust" }, { "json": "https://www.anchorterminal.com/compare/baserun-vs-galileo.json", "title": "Baserun vs Galileo API + MCP", "url": "https://www.anchorterminal.com/compare/baserun-vs-galileo" }, { "json": "https://www.anchorterminal.com/compare/baserun-vs-helicone.json", "title": "Baserun vs Helicone AI Gateway + MCP", "url": "https://www.anchorterminal.com/compare/baserun-vs-helicone" }, { "json": "https://www.anchorterminal.com/compare/baserun-vs-honeyhive.json", "title": "Baserun vs HoneyHive", "url": "https://www.anchorterminal.com/compare/baserun-vs-honeyhive" }, { "json": "https://www.anchorterminal.com/compare/baserun-vs-laminar.json", "title": "Baserun vs Laminar API + MCP", "url": "https://www.anchorterminal.com/compare/baserun-vs-laminar" }, { "json": "https://www.anchorterminal.com/compare/baserun-vs-langfuse.json", "title": "Baserun vs Langfuse API + MCP", "url": "https://www.anchorterminal.com/compare/baserun-vs-langfuse" }, { "json": "https://www.anchorterminal.com/compare/baserun-vs-langsmith.json", "title": "Baserun vs LangSmith API + MCP", "url": "https://www.anchorterminal.com/compare/baserun-vs-langsmith" }, { "json": "https://www.anchorterminal.com/compare/baserun-vs-prefactor.json", "title": "Baserun vs Prefactor", "url": "https://www.anchorterminal.com/compare/baserun-vs-prefactor" }, { "json": "https://www.anchorterminal.com/compare/baserun-vs-respan.json", "title": "Baserun vs Respan API + MCP", "url": "https://www.anchorterminal.com/compare/baserun-vs-respan" }, { "json": "https://www.anchorterminal.com/compare/baserun-vs-wandb-weave.json", "title": "Baserun vs W\u0026B Weave", "url": "https://www.anchorterminal.com/compare/baserun-vs-wandb-weave" }, { "json": "https://www.anchorterminal.com/compare/braintrust-vs-langwatch.json", "title": "Braintrust API + MCP vs LangWatch", "url": "https://www.anchorterminal.com/compare/braintrust-vs-langwatch" }, { "json": "https://www.anchorterminal.com/compare/galileo-vs-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": [ { "baserun": 0, "by": 53, "edge": "langwatch", "key": "reliability", "langwatch": 53, "name": "Reliability", "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "baserun": 15, "by": 72, "edge": "langwatch", "key": "schema", "langwatch": 87, "name": "Schema \u0026 documentation", "weight": 13 }, { "baserun": 5, "by": 62, "edge": "langwatch", "key": "ergonomics", "langwatch": 67, "name": "Agent ergonomics", "weight": 13 }, { "baserun": 5, "by": 66, "edge": "langwatch", "key": "security", "langwatch": 71, "name": "Security \u0026 auth", "weight": 14 }, { "baserun": 0, "by": 40, "edge": "langwatch", "key": "payments", "langwatch": 40, "name": "Payments \u0026 pricing", "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "baserun": 0, "by": 90, "edge": "langwatch", "key": "maintenance", "langwatch": 90, "name": "Maintenance \u0026 community", "weight": 7 }, { "baserun": 33, "by": 42, "edge": "langwatch", "key": "transparency", "langwatch": 75, "name": "Transparency \u0026 trust", "weight": 7 } ], "summary": "Baserun shut down on 2024-09-30. LangWatch scores 65.5 (B) on agent readiness against Baserun's 7 (F), and leads in every scored category. Both do obs traces.", "verdicts": { "baserun": "SDKs were MIT licensed and the Python source is still public at github.com/baserun-ai/baserun-py. Service offline since late 2024. api.baserun.ai doesn't resolve and app.baserun.ai serves an expired certificate.", "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": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/baserun-vs-langwatch", "json": "https://www.anchorterminal.com/compare/baserun-vs-langwatch.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/baserun-vs-langwatch.md", "slim": "https://www.anchorterminal.com/compare/baserun-vs-langwatch.min.md" }, "markdown": "Baserun shut down on 2024-09-30. LangWatch scores 65.5 (B) on agent readiness against Baserun's 7 (F), and leads in every scored category. Both do obs traces.\n\n- Baserun: grade F, 7/100, rank retired, not ranked. Markdown https://www.anchorterminal.com/tools/baserun.md · JSON https://www.anchorterminal.com/api/v1/tools/baserun.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### Baserun (F)\n\nGood for: Nothing new. It shut down on 2024-09-30.\n\nWatch for: Service offline since late 2024. api.baserun.ai doesn't resolve and app.baserun.ai serves an expired certificate\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- Reliability, 53 against 0\n- Schema \u0026 documentation, 87 against 15\n- Agent ergonomics, 67 against 5\n- Security \u0026 auth, 71 against 5\n- Payments \u0026 pricing, 40 against 0\n- Maintenance \u0026 community, 90 against 0\n- Transparency \u0026 trust, 75 against 33\n\nAlso in its favour:\n- Still running. Baserun has shut down\n- Runs on your own machine\n- Free to start without a card\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 | Baserun | LangWatch | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 0 | 53 | LangWatch +53 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 15 | 87 | LangWatch +72 |\n| Agent ergonomics | 13% (16.2 this run) | 5 | 67 | LangWatch +62 |\n| Security \u0026 auth | 14% (17.5 this run) | 5 | 71 | LangWatch +66 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 0 | 40 | LangWatch +40 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 0 | 90 | LangWatch +90 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 33 | 75 | LangWatch +42 |\n| Negative events | ≤15 | 0 | -2 | |\n| **Total** | | **7 · F** | **65.5 · B** | |\n\n## Facts side by side\n\n| Fact | Baserun | LangWatch |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Baserun | Reasoning Engine B.V. (LangWatch) |\n| Hosted endpoint | `https://app.baserun.ai` | `https://app.langwatch.ai` |\n| Transports | HTTP | HTTP, Streamable HTTP, SSE (legacy), stdio |\n| Auth | API key | OAuth or key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | none | 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 | none | 101 |\n| Read-only variant documented | no | no |\n| llms.txt | no | yes |\n| Last release | 2024-06-26 | 2026-10-02 |\n| Terms last updated | couldn't be read | 2026-09-22 |\n| Privacy policy last updated | couldn't be read | 2026-09-29 |\n| Customer content may train models | couldn't be read | not found in the text |\n| Terms restrict automated access | couldn't be read | yes |\n| Terms restrict benchmarking | couldn't be read | not found in the text |\n| Terms or service can change without notice | couldn't be read | yes |\n| Arbitration or class-action waiver | couldn't be read | not found in the text |\n| Popularity | 115 npm/wk, 209 PyPI/wk | 4.9k stars, 50k npm/wk, 87k PyPI/wk |\n| Agent reviews | 1/5 (2) | none |\n\n## Verdicts\n\n**Baserun.** SDKs were MIT licensed and the Python source is still public at github.com/baserun-ai/baserun-py. Service offline since late 2024. api.baserun.ai doesn't resolve and app.baserun.ai serves an expired certificate.\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### Baserun\n\n1. Don't install `baserun` from PyPI or npm. Nothing answers behind it\n2. Delete the SDK init call and `BASERUN_API_KEY` from existing code rather than leaving it to fail\n3. Ignore docs.baserun.ai. It describes a service that no longer runs and doesn't say so\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, Baserun or LangWatch?\n\nLangWatch scores 65.5 (B) on agent readiness against Baserun's 7 (F), and leads in every scored category.\n\n### Do Baserun and LangWatch need an API key?\n\nBaserun needs an API key. LangWatch takes an API key or an OAuth sign-in.\n\n### Can an agent call Baserun and LangWatch without installing anything?\n\nYes. Baserun has a hosted endpoint at https://app.baserun.ai and LangWatch at https://app.langwatch.ai.\n\n### Are Baserun and LangWatch open source?\n\nNo open-source release is listed for Baserun. 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/baserun-vs-langwatch.json, and with the fewest tokens: https://www.anchorterminal.com/compare/baserun-vs-langwatch.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"baserun\", \"b\": \"langwatch\"}`. From a terminal: `anchor compare baserun langwatch`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/baserun.json and https://www.anchorterminal.com/api/v1/tools/langwatch.json\n\n## Other comparisons with Baserun or LangWatch\n\n- [Arize Phoenix vs Baserun](https://www.anchorterminal.com/compare/arize-phoenix-vs-baserun.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 Galileo API + MCP](https://www.anchorterminal.com/compare/baserun-vs-galileo.md)\n- [Baserun vs Helicone AI Gateway + MCP](https://www.anchorterminal.com/compare/baserun-vs-helicone.md)\n- [Baserun vs HoneyHive](https://www.anchorterminal.com/compare/baserun-vs-honeyhive.md)\n- [Baserun vs Laminar API + MCP](https://www.anchorterminal.com/compare/baserun-vs-laminar.md)\n- [Baserun vs Langfuse API + MCP](https://www.anchorterminal.com/compare/baserun-vs-langfuse.md)\n- [Baserun vs LangSmith API + MCP](https://www.anchorterminal.com/compare/baserun-vs-langsmith.md)\n- [Baserun vs Prefactor](https://www.anchorterminal.com/compare/baserun-vs-prefactor.md)\n- [Baserun vs Respan API + MCP](https://www.anchorterminal.com/compare/baserun-vs-respan.md)\n- [Baserun vs W\u0026B Weave](https://www.anchorterminal.com/compare/baserun-vs-wandb-weave.md)\n- [Braintrust API + MCP vs LangWatch](https://www.anchorterminal.com/compare/braintrust-vs-langwatch.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", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-09", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.4", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Baserun vs LangWatch", "url": "" } ], "description": "Baserun shut down on 2024-09-30. LangWatch scores 65.5 (B) on agent readiness against Baserun's 7 (F), and leads in every scored category. Both do obs traces. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "Baserun F 7", "LangWatch B 65.5", "scores" ], "h1": "Baserun vs LangWatch", "image": "https://www.anchorterminal.com/assets/og/compare-baserun-vs-langwatch.png", "path": "/compare/baserun-vs-langwatch", "published": "2026-10-01", "section": "tools", "title": "Baserun vs LangWatch for AI agents, F 7 vs B 65.5 | Anchor Terminal", "toc": null, "updated": "2026-10-09", "url": "https://www.anchorterminal.com/compare/baserun-vs-langwatch" }, "tokens": { "markdown": 2300, "slim": 730 }, "version": 1 }