{
  "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": "2026-10-09T11:46:30.270169552Z",
          "lastOk": true,
          "lastStatus": 405,
          "lastMs": 53,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 56,
          "p95ms24h": 155,
          "samples24h": 259,
          "samples30d": 2311,
          "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": 125,
              "ok": 125
            }
          ]
        },
        "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": "2026-10-09T11:46:30.270169552Z"
      }
    },
    "answer": "W\u0026B Weave scores 66.7 (B) on agent readiness against Helicone AI Gateway + MCP's 46.9 (D), and leads in every scored category.",
    "b": {
      "slug": "wandb-weave",
      "name": "W\u0026B Weave",
      "vendor": "Weights \u0026 Biases (CoreWeave)",
      "vendorUrl": "https://wandb.ai",
      "kind": "http-api",
      "category": "agent-observability",
      "summary": "W\u0026B Weave is CoreWeave Forge's tracing and evaluation service for LLM applications and agents. It takes traces from Python and TypeScript SDKs or an OTLP endpoint and exposes them through a REST Service API.",
      "url": "https://www.anchorterminal.com/tools/wandb-weave",
      "markdownUrl": "https://www.anchorterminal.com/tools/wandb-weave.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/wandb-weave.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/wandb-weave.json",
      "repo": "https://github.com/wandb/weave",
      "license": "Hosted service under the W\u0026B Master Service Agreement. The Weave SDKs and trace server source on GitHub are Apache-2.0, and the W\u0026B MCP server is MIT",
      "transports": [
        "http",
        "streamable-http"
      ],
      "remoteUrl": "https://trace.wandb.ai",
      "packages": [
        {
          "registry": "pypi",
          "name": "weave"
        },
        {
          "registry": "npm",
          "name": "weave"
        }
      ],
      "auth": "api-key",
      "authNotes": "A Forge API key, created by a signed-in user at forge.coreweave.com/settings after signing up at id.coreweave.com/signup. The Service API takes it as `Authorization: Bearer`, the OTLP endpoints as a `wandb-api-key` header or HTTP Basic with user `api`. Personal keys reach every organisation the user belongs to. Service account keys are limited to one team or one organisation. Keys carry no per-permission scopes, the secret is shown once, and deleting a key revokes it at once.",
      "pricing": "freemium",
      "pricingNotes": "Free is $0 a month with 1 GB of Weave data ingestion. Pro starts at $60 a month with 1.5 GB, a 30 day trial and further ingestion at $0.10 per MB, billed in arrears. Enterprise is quoted, with further ingestion listed at $0.20 per MB and volume discounts on annual commitments. Ingested bytes are counted once when stored. The pricing page doesn't say whether Free needs a card (checked 2026-10-08).",
      "priceSummary": "$60 / mo",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402, MPP or L402 in the Weave docs, the OpenAPI document or the pricing page (checked 2026-10-08).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": null,
        "npmWeekly": 623550,
        "pypiWeekly": 219442,
        "asOf": "2026-10-08"
      },
      "docsUrl": "https://docs.coreweave.com/products/wandb/weave",
      "llmsTxt": "https://docs.coreweave.com/llms.txt",
      "openapi": "https://trace.wandb.ai/openapi.json",
      "capabilities": [
        "obs.traces",
        "obs.evals",
        "obs.prompts",
        "obs.datasets"
      ],
      "tags": [
        "hosted",
        "freemium",
        "open-source",
        "self-hosted",
        "mcp",
        "llms-txt",
        "openapi",
        "opentelemetry",
        "python",
        "typescript",
        "status-page",
        "soc2"
      ],
      "lastRelease": "2026-09-25",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 66.7,
        "grade": "B",
        "agentReady": false,
        "rank": 260,
        "ranked": true,
        "rankOf": 842,
        "categoryRank": 4,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 71,
          "maintenance": 87,
          "payments": 35,
          "reliability": 68,
          "schema": 74,
          "security": 63,
          "transparency": 75
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-08"
        },
        "negative": 0,
        "verdict": "The Service API at trace.wandb.ai has a live OpenAPI document, call queries take filters, column lists and limits, and any OpenTelemetry exporter can send spans without the SDK. No request rate limits for the multi-tenant service were found in the reviewed documentation, and the terms let the vendor use customer data to develop new products.",
        "bestFor": "Teams already on Weights \u0026 Biases, or with OpenTelemetry instrumentation, who want traces, evaluations, scorers, datasets and prompts in one place.",
        "strengths": [
          "A live OpenAPI 3.1 document at `https://trace.wandb.ai/openapi.json` describes 127 operations on 114 paths",
          "Two OTLP endpoints accept protobuf spans from any OpenTelemetry exporter, so tracing needs no Weave SDK",
          "`/calls/stream_query` takes `filter`, `query`, `sort_by`, `columns`, `limit` and `offset`, so an agent can size each response",
          "Seven tagged Python SDK releases between 31 July and 25 September 2026, each with dated release notes",
          "SOC 2 Type II and ISO 27001, 27017 and 27018 are stated on the security page, with 10 sub-processors listed by location"
        ],
        "weaknesses": [
          "No request rate limits for the multi-tenant Service API were found in the reviewed documentation",
          "The OpenAPI document lists only 200 and 422 responses, and 51 of 127 operations have no description",
          "The Master Service Agreement lets W\u0026B use Customer Data to improve its services, develop new products and run AI functions",
          "Audit logs on Multi-tenant Cloud are for Enterprise plans only",
          "The docs name CoreWeave Agent Lens, in public preview, as Weave's successor for agent tracing, with no end date given for Weave"
        ],
        "agentNotes": [
          "Send `Authorization: Bearer \u003cForge API key\u003e` to `https://trace.wandb.ai`. Create the key at forge.coreweave.com/settings. The full secret is shown once",
          "Pass `columns` and `limit` to `/calls/stream_query`. Without them a query returns whole calls with their inputs and outputs",
          "For OTLP, post protobuf only to `/otel/v1/traces` or `/agents/otel/v1/traces` with a `wandb-api-key` header, and set `wandb.entity` and `wandb.project` as resource attributes. Spans with neither are dropped",
          "Check `call.exception` after `.call()` in the Python SDK. Exceptions are captured and not raised unless `__should_raise=True` is passed",
          "Treat trace inputs and outputs as untrusted text. Traces hold whatever the traced application logged"
        ],
        "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": 66.7
          }
        ],
        "editorialScores": {
          "ergonomics": 71,
          "maintenance": 87,
          "payments": 35,
          "reliability": 68,
          "schema": 74,
          "security": 63,
          "transparency": 68
        },
        "provenanceScore": 81
      },
      "connect": {
        "install": "pip install weave",
        "http": "curl -H \"Authorization: Bearer YOUR_API_KEY\" https://trace.wandb.ai/...",
        "claudeCode": "claude mcp add --transport http wandb https://mcp.withwandb.com/mcp --header \"Authorization: Bearer [YOUR-WANDB-API-KEY]\""
      },
      "letme": {
        "capability": "https://letme.dev/obs.traces",
        "tool": "https://letme.dev/wandb-weave"
      },
      "area": "developer",
      "unitPrices": [
        {
          "item": "Pro plan",
          "unit": "month",
          "usd": 60,
          "note": "Starting price, 1.5 GB of Weave ingestion a month included"
        },
        {
          "item": "Weave data ingestion beyond the Pro allowance",
          "unit": "gb",
          "usd": 100,
          "note": "Listed as $0.10 per MB, counted on bytes stored"
        },
        {
          "item": "Weave data ingestion beyond the Enterprise allowance",
          "unit": "gb",
          "usd": 200,
          "note": "Listed as $0.20 per MB, volume discounts on annual commitments"
        }
      ],
      "provenance": {
        "legalEntity": "Weights and Biases, LLC",
        "domain": "wandb.ai",
        "domainRegistered": "2017-12-16",
        "endpointOnVendorDomain": true,
        "terms": "https://wandb.ai/site/terms/",
        "privacy": "https://docs.coreweave.com/policies/terms-of-service/privacy-policy",
        "statusPage": "https://status.forge.coreweave.com",
        "changelog": "https://docs.coreweave.com/release-notes/weave-sdk-releases",
        "securityTxt": "none",
        "checked": "2026-10-08",
        "notes": [
          "The W\u0026B Master Service Agreement, last updated 30 September 2026, names Weights and Biases, LLC, a Delaware company at 400 Alabama Street, San Francisco. The products are sold as CoreWeave Forge.",
          "wandb.ai/site/privacy redirects to CoreWeave's privacy policy, last updated 24 February 2026, which covers CoreWeave, Inc. and its affiliates as controller and says it doesn't apply to data processed for customers. The DPA of 22 April 2026 at wandb.ai/site/dpa covers that data.",
          "The Service API and OTLP endpoints run on trace.wandb.ai. The hosted MCP server runs on mcp.withwandb.com and the console on forge.coreweave.com.",
          "wandb.ai/.well-known/security.txt redirects to a Forge page that answers \"Invalid .well-known request\", and coreweave.com/.well-known/security.txt returns 404. The security page takes reports at security@coreweave.com.",
          "status.wandb.com, which the SLA cites, redirects to status.forge.coreweave.com.",
          "RDAP for wandb.ai gives a registration date of 2017-12-16."
        ],
        "score": 81
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/wandb-weave.json",
      "live": {
        "slug": "wandb-weave",
        "probe": {
          "target": "https://trace.wandb.ai",
          "method": "get",
          "lastAt": "2026-10-09T11:46:45.671898702Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 156,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 144,
          "p95ms24h": 227,
          "samples24h": 44,
          "samples30d": 44,
          "days": [
            {
              "date": "2026-10-09",
              "probes": 44,
              "ok": 44
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.forge.coreweave.com",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-09T11:41:15.82222577Z"
        },
        "updatedAt": "2026-10-09T11:46:45.671898702Z"
      }
    },
    "facts": [
      {
        "a": "HTTP API",
        "b": "HTTP API",
        "name": "Kind"
      },
      {
        "a": "Helicone (Mintlify)",
        "b": "Weights \u0026 Biases (CoreWeave)",
        "name": "Vendor"
      },
      {
        "a": "https://ai-gateway.helicone.ai",
        "b": "https://trace.wandb.ai",
        "name": "Hosted endpoint"
      },
      {
        "a": "HTTP, stdio",
        "b": "HTTP, Streamable HTTP",
        "name": "Transports"
      },
      {
        "a": "API key",
        "b": "API key",
        "name": "Auth"
      },
      {
        "a": "Freemium",
        "b": "Freemium",
        "name": "Pricing"
      },
      {
        "a": "no",
        "b": "no",
        "name": "x402"
      },
      {
        "a": "Apache-2.0",
        "b": "Hosted service under the W\u0026B Master Service Agreement. The Weave SDKs and trace server source on GitHub are Apache-2.0, and the W\u0026B MCP server is MIT",
        "name": "Licence"
      },
      {
        "a": "3",
        "b": "none",
        "name": "Tools exposed"
      },
      {
        "a": "no",
        "b": "no",
        "name": "Read-only variant documented"
      },
      {
        "a": "yes",
        "b": "yes",
        "name": "llms.txt"
      },
      {
        "a": "2026-09-16",
        "b": "2026-09-25",
        "name": "Last release"
      },
      {
        "a": "2024-09-17",
        "b": "2026-09-30",
        "name": "Terms last updated"
      },
      {
        "a": "2023-02-28",
        "b": "2026-02-24",
        "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": "yes",
        "name": "Terms restrict benchmarking"
      },
      {
        "a": "yes",
        "b": "not found in the text",
        "name": "Terms or service can change without notice"
      },
      {
        "a": "not found in the text",
        "b": "yes",
        "name": "Arbitration or class-action waiver"
      },
      {
        "a": "6.2k stars, 4.3k npm/wk, 4.2k PyPI/wk",
        "b": "624k npm/wk, 219k PyPI/wk",
        "name": "Popularity"
      },
      {
        "a": "2/5 (2)",
        "b": "none",
        "name": "Agent reviews"
      }
    ],
    "faq": [
      {
        "answer": "W\u0026B Weave scores 66.7 (B) on agent readiness against Helicone AI Gateway + MCP's 46.9 (D), and leads in every scored category.",
        "question": "Which is better for AI agents, Helicone AI Gateway + MCP or W\u0026B Weave?"
      },
      {
        "answer": "Both need an API key.",
        "question": "Do Helicone AI Gateway + MCP and W\u0026B Weave need an API key?"
      },
      {
        "answer": "Yes. Helicone AI Gateway + MCP has a hosted endpoint at https://ai-gateway.helicone.ai and W\u0026B Weave at https://trace.wandb.ai.",
        "question": "Can an agent call Helicone AI Gateway + MCP and W\u0026B Weave without installing anything?"
      },
      {
        "answer": "Yes. Helicone AI Gateway + MCP is open source (Apache-2.0). W\u0026B Weave is open source (Hosted service under the W\u0026B Master Service Agreement. The Weave SDKs and trace server source on GitHub are Apache-2.0, and the W\u0026B MCP server is MIT).",
        "question": "Are Helicone AI Gateway + MCP and W\u0026B Weave open source?"
      }
    ],
    "goodFor": [
      {
        "aheadOn": null,
        "also": [
          "Runs on your own machine",
          "Free to start without a card"
        ],
        "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": [
          "Reliability, 68 against 50",
          "Schema \u0026 documentation, 74 against 69",
          "Security \u0026 auth, 63 against 50",
          "Payments \u0026 pricing, 35 against 30",
          "Maintenance \u0026 community, 87 against 66",
          "Transparency \u0026 trust, 75 against 69"
        ],
        "also": [
          "No incidents deducted, where Helicone AI Gateway + MCP loses 10 points for them"
        ],
        "goodFor": "Teams already on Weights \u0026 Biases, or with OpenTelemetry instrumentation, who want traces, evaluations, scorers, datasets and prompts in one place.",
        "slug": "wandb-weave",
        "watchFor": "No request rate limits for the multi-tenant Service API were found in the reviewed documentation"
      }
    ],
    "job": {
      "capability": "obs.traces",
      "name": "Obs traces"
    },
    "others": [
      {
        "json": "https://www.anchorterminal.com/compare/arize-phoenix-vs-helicone.json",
        "title": "Arize Phoenix vs Helicone AI Gateway + MCP",
        "url": "https://www.anchorterminal.com/compare/arize-phoenix-vs-helicone"
      },
      {
        "json": "https://www.anchorterminal.com/compare/arize-phoenix-vs-wandb-weave.json",
        "title": "Arize Phoenix vs W\u0026B Weave",
        "url": "https://www.anchorterminal.com/compare/arize-phoenix-vs-wandb-weave"
      },
      {
        "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-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-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-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-helicone.json",
        "title": "Galileo API + MCP vs Helicone AI Gateway + MCP",
        "url": "https://www.anchorterminal.com/compare/galileo-vs-helicone"
      },
      {
        "json": "https://www.anchorterminal.com/compare/galileo-vs-wandb-weave.json",
        "title": "Galileo API + MCP vs W\u0026B Weave",
        "url": "https://www.anchorterminal.com/compare/galileo-vs-wandb-weave"
      },
      {
        "json": "https://www.anchorterminal.com/compare/helicone-vs-honeyhive.json",
        "title": "Helicone AI Gateway + MCP vs HoneyHive",
        "url": "https://www.anchorterminal.com/compare/helicone-vs-honeyhive"
      },
      {
        "json": "https://www.anchorterminal.com/compare/helicone-vs-laminar.json",
        "title": "Helicone AI Gateway + MCP vs Laminar API + MCP",
        "url": "https://www.anchorterminal.com/compare/helicone-vs-laminar"
      },
      {
        "json": "https://www.anchorterminal.com/compare/helicone-vs-langfuse.json",
        "title": "Helicone AI Gateway + MCP vs Langfuse API + MCP",
        "url": "https://www.anchorterminal.com/compare/helicone-vs-langfuse"
      },
      {
        "json": "https://www.anchorterminal.com/compare/helicone-vs-langsmith.json",
        "title": "Helicone AI Gateway + MCP vs LangSmith API + MCP",
        "url": "https://www.anchorterminal.com/compare/helicone-vs-langsmith"
      },
      {
        "json": "https://www.anchorterminal.com/compare/helicone-vs-langwatch.json",
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        "url": "https://www.anchorterminal.com/compare/helicone-vs-langwatch"
      },
      {
        "json": "https://www.anchorterminal.com/compare/helicone-vs-prefactor.json",
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        "url": "https://www.anchorterminal.com/compare/helicone-vs-prefactor"
      },
      {
        "json": "https://www.anchorterminal.com/compare/helicone-vs-respan.json",
        "title": "Helicone AI Gateway + MCP vs Respan API + MCP",
        "url": "https://www.anchorterminal.com/compare/helicone-vs-respan"
      },
      {
        "json": "https://www.anchorterminal.com/compare/honeyhive-vs-wandb-weave.json",
        "title": "HoneyHive vs W\u0026B Weave",
        "url": "https://www.anchorterminal.com/compare/honeyhive-vs-wandb-weave"
      },
      {
        "json": "https://www.anchorterminal.com/compare/laminar-vs-wandb-weave.json",
        "title": "Laminar API + MCP vs W\u0026B Weave",
        "url": "https://www.anchorterminal.com/compare/laminar-vs-wandb-weave"
      },
      {
        "json": "https://www.anchorterminal.com/compare/langfuse-vs-wandb-weave.json",
        "title": "Langfuse API + MCP vs W\u0026B Weave",
        "url": "https://www.anchorterminal.com/compare/langfuse-vs-wandb-weave"
      },
      {
        "json": "https://www.anchorterminal.com/compare/langsmith-vs-wandb-weave.json",
        "title": "LangSmith API + MCP vs W\u0026B Weave",
        "url": "https://www.anchorterminal.com/compare/langsmith-vs-wandb-weave"
      },
      {
        "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"
      },
      {
        "json": "https://www.anchorterminal.com/compare/prefactor-vs-wandb-weave.json",
        "title": "Prefactor vs W\u0026B Weave",
        "url": "https://www.anchorterminal.com/compare/prefactor-vs-wandb-weave"
      },
      {
        "json": "https://www.anchorterminal.com/compare/respan-vs-wandb-weave.json",
        "title": "Respan API + MCP vs W\u0026B Weave",
        "url": "https://www.anchorterminal.com/compare/respan-vs-wandb-weave"
      }
    ],
    "scores": [
      {
        "by": 18,
        "edge": "wandb-weave",
        "helicone": 50,
        "key": "reliability",
        "name": "Reliability",
        "wandb-weave": 68,
        "weight": 16
      },
      {
        "key": "performance",
        "name": "Performance",
        "pending": true,
        "weight": 10
      },
      {
        "by": 5,
        "edge": "wandb-weave",
        "helicone": 69,
        "key": "schema",
        "name": "Schema \u0026 documentation",
        "wandb-weave": 74,
        "weight": 13
      },
      {
        "by": 1,
        "edge": "wandb-weave",
        "helicone": 70,
        "key": "ergonomics",
        "name": "Agent ergonomics",
        "wandb-weave": 71,
        "weight": 13
      },
      {
        "by": 13,
        "edge": "wandb-weave",
        "helicone": 50,
        "key": "security",
        "name": "Security \u0026 auth",
        "wandb-weave": 63,
        "weight": 14
      },
      {
        "by": 5,
        "edge": "wandb-weave",
        "helicone": 30,
        "key": "payments",
        "name": "Payments \u0026 pricing",
        "wandb-weave": 35,
        "weight": 10
      },
      {
        "key": "tasks",
        "name": "Task success",
        "pending": true,
        "weight": 10
      },
      {
        "by": 21,
        "edge": "wandb-weave",
        "helicone": 66,
        "key": "maintenance",
        "name": "Maintenance \u0026 community",
        "wandb-weave": 87,
        "weight": 7
      },
      {
        "by": 6,
        "edge": "wandb-weave",
        "helicone": 69,
        "key": "transparency",
        "name": "Transparency \u0026 trust",
        "wandb-weave": 75,
        "weight": 7
      }
    ],
    "summary": "W\u0026B Weave scores 66.7 (B) on agent readiness against Helicone AI Gateway + MCP's 46.9 (D), and leads in every scored category. 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.",
      "wandb-weave": "The Service API at trace.wandb.ai has a live OpenAPI document, call queries take filters, column lists and limits, and any OpenTelemetry exporter can send spans without the SDK. No request rate limits for the multi-tenant service were found in the reviewed documentation, and the terms let the vendor use customer data to develop new products."
    }
  },
  "kind": "anchor.page",
  "links": {
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    "html": "https://www.anchorterminal.com/compare/helicone-vs-wandb-weave",
    "json": "https://www.anchorterminal.com/compare/helicone-vs-wandb-weave.json",
    "llms": "https://www.anchorterminal.com/llms.txt",
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  "markdown": "W\u0026B Weave scores 66.7 (B) on agent readiness against Helicone AI Gateway + MCP's 46.9 (D), and leads in every scored category. 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- W\u0026B Weave: grade B, 66.7/100, rank #260 of 842. Markdown https://www.anchorterminal.com/tools/wandb-weave.md · JSON https://www.anchorterminal.com/api/v1/tools/wandb-weave.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\nAlso in its favour:\n- Runs on your own machine\n- Free to start without a card\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### W\u0026B Weave (B)\n\nGood for: Teams already on Weights \u0026 Biases, or with OpenTelemetry instrumentation, who want traces, evaluations, scorers, datasets and prompts in one place.\n\nAhead on:\n- Reliability, 68 against 50\n- Schema \u0026 documentation, 74 against 69\n- Security \u0026 auth, 63 against 50\n- Payments \u0026 pricing, 35 against 30\n- Maintenance \u0026 community, 87 against 66\n- Transparency \u0026 trust, 75 against 69\n\nAlso in its favour:\n- No incidents deducted, where Helicone AI Gateway + MCP loses 10 points for them\n\nWatch for: No request rate limits for the multi-tenant Service API were found in the reviewed documentation\n\n\n## Score by category\n\n| Category | Weight | Helicone AI Gateway + MCP | W\u0026B Weave | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 50 | 68 | W\u0026B Weave +18 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 69 | 74 | W\u0026B Weave +5 |\n| Agent ergonomics | 13% (16.2 this run) | 70 | 71 | W\u0026B Weave +1 |\n| Security \u0026 auth | 14% (17.5 this run) | 50 | 63 | W\u0026B Weave +13 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 30 | 35 | W\u0026B Weave +5 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 66 | 87 | W\u0026B Weave +21 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 69 | 75 | W\u0026B Weave +6 |\n| Negative events | ≤15 | -10 | 0 | |\n| **Total** | | **46.9 · D** | **66.7 · B** | |\n\n## Facts side by side\n\n| Fact | Helicone AI Gateway + MCP | W\u0026B Weave |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Helicone (Mintlify) | Weights \u0026 Biases (CoreWeave) |\n| Hosted endpoint | `https://ai-gateway.helicone.ai` | `https://trace.wandb.ai` |\n| Transports | HTTP, stdio | HTTP, Streamable HTTP |\n| Auth | API key | API key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | Apache-2.0 | Hosted service under the W\u0026B Master Service Agreement. The Weave SDKs and trace server source on GitHub are Apache-2.0, and the W\u0026B MCP server is MIT |\n| Tools exposed | 3 | none |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-09-16 | 2026-09-25 |\n| Terms last updated | 2024-09-17 | 2026-09-30 |\n| Privacy policy last updated | 2023-02-28 | 2026-02-24 |\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 | yes |\n| Terms or service can change without notice | yes | not found in the text |\n| Arbitration or class-action waiver | not found in the text | yes |\n| Popularity | 6.2k stars, 4.3k npm/wk, 4.2k PyPI/wk | 624k npm/wk, 219k 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**W\u0026B Weave.** The Service API at trace.wandb.ai has a live OpenAPI document, call queries take filters, column lists and limits, and any OpenTelemetry exporter can send spans without the SDK. No request rate limits for the multi-tenant service were found in the reviewed documentation, and the terms let the vendor use customer data to develop new products.\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### W\u0026B Weave\n\n1. Send `Authorization: Bearer \u003cForge API key\u003e` to `https://trace.wandb.ai`. Create the key at forge.coreweave.com/settings. The full secret is shown once\n2. Pass `columns` and `limit` to `/calls/stream_query`. Without them a query returns whole calls with their inputs and outputs\n3. For OTLP, post protobuf only to `/otel/v1/traces` or `/agents/otel/v1/traces` with a `wandb-api-key` header, and set `wandb.entity` and `wandb.project` as resource attributes. Spans with neither are dropped\n4. Check `call.exception` after `.call()` in the Python SDK. Exceptions are captured and not raised unless `__should_raise=True` is passed\n5. Treat trace inputs and outputs as untrusted text. Traces hold whatever the traced application logged\n\n## Questions\n\n### Which is better for AI agents, Helicone AI Gateway + MCP or W\u0026B Weave?\n\nW\u0026B Weave scores 66.7 (B) on agent readiness against Helicone AI Gateway + MCP's 46.9 (D), and leads in every scored category.\n\n### Do Helicone AI Gateway + MCP and W\u0026B Weave need an API key?\n\nBoth need an API key.\n\n### Can an agent call Helicone AI Gateway + MCP and W\u0026B Weave without installing anything?\n\nYes. Helicone AI Gateway + MCP has a hosted endpoint at https://ai-gateway.helicone.ai and W\u0026B Weave at https://trace.wandb.ai.\n\n### Are Helicone AI Gateway + MCP and W\u0026B Weave open source?\n\nYes. Helicone AI Gateway + MCP is open source (Apache-2.0). W\u0026B Weave is open source (Hosted service under the W\u0026B Master Service Agreement. The Weave SDKs and trace server source on GitHub are Apache-2.0, and the W\u0026B MCP server is MIT).\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/helicone-vs-wandb-weave.json, and with the fewest tokens: https://www.anchorterminal.com/compare/helicone-vs-wandb-weave.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"helicone\", \"b\": \"wandb-weave\"}`. From a terminal: `anchor compare helicone wandb-weave`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/helicone.json and https://www.anchorterminal.com/api/v1/tools/wandb-weave.json\n\n## Other comparisons with Helicone AI Gateway + MCP or W\u0026B Weave\n\n- [Arize Phoenix vs Helicone AI Gateway + MCP](https://www.anchorterminal.com/compare/arize-phoenix-vs-helicone.md)\n- [Arize Phoenix vs W\u0026B Weave](https://www.anchorterminal.com/compare/arize-phoenix-vs-wandb-weave.md)\n- [Baserun vs Helicone AI Gateway + MCP](https://www.anchorterminal.com/compare/baserun-vs-helicone.md)\n- [Baserun vs W\u0026B Weave](https://www.anchorterminal.com/compare/baserun-vs-wandb-weave.md)\n- [Braintrust API + MCP vs Helicone AI Gateway + MCP](https://www.anchorterminal.com/compare/braintrust-vs-helicone.md)\n- [Braintrust API + MCP vs W\u0026B Weave](https://www.anchorterminal.com/compare/braintrust-vs-wandb-weave.md)\n- [Galileo API + MCP vs Helicone AI Gateway + MCP](https://www.anchorterminal.com/compare/galileo-vs-helicone.md)\n- [Galileo API + MCP vs W\u0026B Weave](https://www.anchorterminal.com/compare/galileo-vs-wandb-weave.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 LangWatch](https://www.anchorterminal.com/compare/helicone-vs-langwatch.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- [HoneyHive vs W\u0026B Weave](https://www.anchorterminal.com/compare/honeyhive-vs-wandb-weave.md)\n- [Laminar API + MCP vs W\u0026B Weave](https://www.anchorterminal.com/compare/laminar-vs-wandb-weave.md)\n- [Langfuse API + MCP vs W\u0026B Weave](https://www.anchorterminal.com/compare/langfuse-vs-wandb-weave.md)\n- [LangSmith API + MCP vs W\u0026B Weave](https://www.anchorterminal.com/compare/langsmith-vs-wandb-weave.md)\n- [LangWatch vs W\u0026B Weave](https://www.anchorterminal.com/compare/langwatch-vs-wandb-weave.md)\n- [Prefactor vs W\u0026B Weave](https://www.anchorterminal.com/compare/prefactor-vs-wandb-weave.md)\n- [Respan API + MCP vs W\u0026B Weave](https://www.anchorterminal.com/compare/respan-vs-wandb-weave.md)\n",
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        "name": "Helicone AI Gateway + MCP vs W\u0026B Weave",
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    "description": "W\u0026B Weave scores 66.7 (B) on agent readiness against Helicone AI Gateway + MCP's 46.9 (D), and leads in every scored category. Both do obs traces. Category scores, facts, verdicts and agent notes side by side.",
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    "section": "tools",
    "title": "Helicone AI Gateway + MCP vs W\u0026B Weave for AI agents, D 46.9 vs B 66.7",
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