{
  "data": {
    "a": {
      "slug": "retell-ai",
      "name": "Retell AI API + MCP",
      "vendor": "Retell AI",
      "vendorUrl": "https://www.retellai.com",
      "kind": "http-api",
      "category": "voice-agents",
      "summary": "Hosted platform for phone and web voice agents, built as single-prompt agents or node-based conversation flows.",
      "url": "https://www.anchorterminal.com/tools/retell-ai",
      "markdownUrl": "https://www.anchorterminal.com/tools/retell-ai.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/retell-ai.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/retell-ai.json",
      "repo": "https://github.com/RetellAI/retell-typescript-sdk",
      "license": "Apache-2.0 (SDKs)",
      "transports": [
        "http",
        "streamable-http"
      ],
      "remoteUrl": "https://api.retellai.com",
      "packages": [
        {
          "registry": "npm",
          "name": "retell-sdk"
        },
        {
          "registry": "npm",
          "name": "retell-client-js-sdk"
        },
        {
          "registry": "pypi",
          "name": "retell-sdk"
        }
      ],
      "auth": "api-key",
      "authNotes": "Bearer API key for the REST API and the hosted MCP server at `https://mcp.retellai.com`. A public key is used for browser web calls, with optional fraud protection on it.",
      "pricing": "usage",
      "pricingNotes": "Pay as you go with $10 of free credits, priced per component. Voice infrastructure $0.055 a minute, Retell and most third-party voices $0.015 (ElevenLabs $0.04), telephony $0.015 on Retell numbers, and the LLM from $0.0016 to $0.32 a minute depending on model. The vendor puts the total at $0.07 to $0.31 a minute. Speech-to-speech models run $0.07 (GPT Realtime mini) to $0.38 a minute. Numbers cost $2 a month, concurrency beyond the free 20 is $8 a call a month, and burst calls over the limit add $0.10 a minute. Enterprise pricing is custom (https://www.retellai.com/pricing).",
      "priceSummary": "$2 / mo",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402 support in the docs, pricing page or MCP docs (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": 62,
        "npmWeekly": 242906,
        "pypiWeekly": null,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://docs.retellai.com",
      "llmsTxt": "https://docs.retellai.com/llms.txt",
      "openapi": "https://docs.retellai.com/openapi-final.yaml",
      "capabilities": [
        "voice.agent",
        "voice.pipeline",
        "voice.speech-to-speech",
        "voice.tools",
        "voice.telephony"
      ],
      "tags": [
        "hosted",
        "closed-source",
        "no-card",
        "mcp",
        "llms-txt",
        "openapi",
        "typescript",
        "python",
        "webhooks",
        "streaming",
        "pipeline",
        "speech-to-speech",
        "enterprise"
      ],
      "lastRelease": "2026-09-14",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 69.4,
        "grade": "B",
        "agentReady": false,
        "rank": 114,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 2,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 60,
          "maintenance": 85,
          "payments": 40,
          "reliability": 60,
          "schema": 92,
          "security": 76,
          "transparency": 79
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "Published per-minute price for every component, from $0.07 a minute all in. Call data kept indefinitely unless retention is set per agent.",
        "strengths": [
          "Published per-minute price for every component, from $0.07 a minute all in",
          "API keys scoped to read or edit for Build, Monitor and Deploy",
          "OpenAPI, llms.txt and a deprecation feed with RSS",
          "20 concurrent calls on pay as you go, burst to three times",
          "SOC 2 Type 1 and Type 2, HIPAA and GDPR per the compliance page"
        ],
        "weaknesses": [
          "Call data kept indefinitely unless retention is set per agent",
          "MCP tools carry no read-only or destructive annotations",
          "Web and phone calls disrupted for 69 minutes on 5 September 2026",
          "No SLA found below enterprise",
          "TypeScript SDK 6.0.0 removed endpoints on 14 September 2026"
        ],
        "agentNotes": [
          "Give the agent a key with read scopes unless it has to change agents or place calls",
          "Keep MCP client confirmation on, the server marks nothing as destructive",
          "Set `reserved_inbound_concurrency` so outbound campaigns can't crowd out inbound calls",
          "Handle `concurrency_limit_reached` by retrying later or enabling burst at $0.10 a minute extra",
          "Set a data retention period on each agent that handles personal data"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 3.5,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "B",
            "methodology": "0.3",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 69.4
          }
        ],
        "editorialScores": {
          "ergonomics": 60,
          "maintenance": 85,
          "payments": 40,
          "reliability": 60,
          "schema": 92,
          "security": 76,
          "transparency": 75
        },
        "provenanceScore": 82
      },
      "connect": {
        "http": "curl -X POST https://api.retellai.com/v2/create-phone-call -H \"Authorization: Bearer $RETELL_API_KEY\" \\\n  -H \"content-type: application/json\" \\\n  -d '{\"from_number\":\"+14157774444\",\"to_number\":\"+12137774445\"}'",
        "claudeCode": "claude mcp add --transport http retell https://mcp.retellai.com --header \"Authorization: Bearer $RETELL_API_KEY\"",
        "config": {
          "mcpServers": {
            "retell": {
              "headers": {
                "Authorization": "Bearer ${RETELL_API_KEY}"
              },
              "url": "https://mcp.retellai.com"
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/voice.agent",
        "tool": "https://letme.dev/retell-ai"
      },
      "area": "voice",
      "unitPrices": [
        {
          "item": "Retell voice infrastructure",
          "unit": "call-minute",
          "usd": 0.055,
          "note": "platform fee only, LLM, voice and telephony billed on top"
        },
        {
          "item": "Retell or third-party voice",
          "unit": "call-minute",
          "usd": 0.015,
          "note": "ElevenLabs voices $0.04"
        },
        {
          "item": "Retell telephony",
          "unit": "call-minute",
          "usd": 0.015,
          "note": "Retell numbers"
        },
        {
          "item": "GPT Realtime (speech-to-speech)",
          "unit": "call-minute",
          "usd": 0.345
        },
        {
          "item": "GPT Realtime mini (speech-to-speech)",
          "unit": "call-minute",
          "usd": 0.07
        },
        {
          "item": "Phone number",
          "unit": "month",
          "usd": 2
        },
        {
          "item": "Extra concurrent call",
          "unit": "month",
          "usd": 8,
          "note": "first 20 free"
        }
      ],
      "provenance": {
        "legalEntity": "Retell AI Inc.",
        "domain": "retellai.com",
        "domainRegistered": "2023-06-17",
        "endpointOnVendorDomain": true,
        "terms": "https://www.retellai.com/legal/terms-of-service",
        "privacy": "https://www.retellai.com/legal/privacy-policy",
        "statusPage": "https://status.retellai.com",
        "changelog": "https://www.retellai.com/changelog",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "score": 82
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/retell-ai.json",
      "live": {
        "slug": "retell-ai",
        "probe": {
          "target": "https://api.retellai.com",
          "method": "get",
          "lastAt": "2026-10-04T23:48:15.179652298Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 407,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 400,
          "p95ms24h": 454,
          "samples24h": 272,
          "samples30d": 1100,
          "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": 270,
              "ok": 270
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.retellai.com",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-04T23:49:26.900883008Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "RetellAI/retell-typescript-sdk",
            "version": "v6.0.1",
            "released": "2026-09-14",
            "seenAt": "2026-10-04T16:38:33.194361249Z"
          },
          {
            "registry": "npm",
            "name": "retell-client-js-sdk",
            "version": "3.0.2",
            "seenAt": "2026-10-04T16:38:31.197486147Z"
          },
          {
            "registry": "npm",
            "name": "retell-sdk",
            "version": "6.0.1",
            "seenAt": "2026-10-04T16:38:30.795021522Z"
          },
          {
            "registry": "pypi",
            "name": "retell-sdk",
            "version": "6.0.1",
            "released": "2026-09-14",
            "seenAt": "2026-10-04T16:38:33.004573445Z"
          }
        ],
        "githubStars": 62,
        "npmWeekly": 266545,
        "pypiWeekly": 177027,
        "securityTxt": {
          "url": "https://retellai.com/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-04T15:15:57.649934082Z"
        },
        "llmsTxt": {
          "url": "https://docs.retellai.com/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-04T15:18:11.792238049Z"
        },
        "domain": {
          "domain": "retellai.com",
          "registered": "2023-06-17",
          "source": "https://rdap.verisign.com/com/v1/domain/retellai.com",
          "checkedAt": "2026-10-04T13:07:24.959713497Z"
        },
        "pages": [
          {
            "url": "https://www.retellai.com/changelog",
            "kind": "changelog",
            "status": 304,
            "checkedAt": "2026-10-04T15:51:53.701641361Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "69acd4d4ac18"
          },
          {
            "url": "https://docs.retellai.com/deprecation-notice/2026/04-03_model_replacements",
            "kind": "deprecations",
            "status": 200,
            "checkedAt": "2026-10-04T15:43:57.067738394Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "5f44b93c3852"
          },
          {
            "url": "https://docs.retellai.com/deprecation-notice/2026/07-20_legacy_mcp_server",
            "kind": "deprecations",
            "status": 200,
            "checkedAt": "2026-10-04T15:43:59.299839944Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "c334d3256a05"
          },
          {
            "url": "https://www.retellai.com/pricing",
            "kind": "pricing",
            "status": 304,
            "checkedAt": "2026-10-04T15:51:59.747888411Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "9658d88f5dcd"
          },
          {
            "url": "https://www.retellai.com/legal/privacy-policy",
            "kind": "privacy",
            "status": 304,
            "checkedAt": "2026-10-04T15:51:55.742254294Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "e80c24eba4d4"
          },
          {
            "url": "https://www.retellai.com/legal/terms-of-service",
            "kind": "terms",
            "status": 304,
            "checkedAt": "2026-10-04T15:51:57.730861562Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "106049026b59"
          }
        ],
        "updatedAt": "2026-10-04T23:49:26.900883008Z"
      }
    },
    "b": {
      "slug": "vogent",
      "name": "Vogent API",
      "vendor": "Vogent",
      "vendorUrl": "https://www.vogent.ai",
      "kind": "http-api",
      "category": "voice-agents",
      "summary": "Phone voice-agent platform with its own conversational LLM, voices and IVR-navigation models alongside GPT.",
      "url": "https://www.anchorterminal.com/tools/vogent",
      "markdownUrl": "https://www.anchorterminal.com/tools/vogent.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/vogent.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/vogent.json",
      "transports": [
        "http"
      ],
      "remoteUrl": "https://api.vogent.ai/api",
      "packages": [
        {
          "registry": "npm",
          "name": "@vogent/vogent-web-client"
        }
      ],
      "auth": "api-key",
      "authNotes": "Bearer API key created per user in the dashboard. Keys stop working when that user leaves the workspace. Webhooks are signed with HMAC-SHA256 in the `X-Elto-Signature` header.",
      "pricing": "usage",
      "pricingNotes": "Pay as you go, metered by the second. $0.09 a minute ($0.0015 a second) with standard voices and $0.14 a minute ($0.0023 a second) with premium voices. The docs don't say whether telephony is included or whether there's free credit. Enterprise plans add volume discounts from about 5,000 to 10,000 calls a month (https://docs.vogent.ai/platform-overview/billing).",
      "priceSummary": "Pay per use",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402 support in the docs or OpenAPI spec (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": null,
        "npmWeekly": 899,
        "pypiWeekly": null,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://docs.vogent.ai",
      "llmsTxt": "https://docs.vogent.ai/llms.txt",
      "openapi": "https://docs.vogent.ai/api-reference/openapi.yaml",
      "capabilities": [
        "voice.agent",
        "voice.pipeline",
        "voice.tools",
        "voice.telephony"
      ],
      "tags": [
        "hosted",
        "closed-source",
        "openapi",
        "llms-txt",
        "typescript",
        "webhooks",
        "pipeline",
        "enterprise"
      ],
      "lastRelease": "2026-01-23",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 47.4,
        "grade": "D",
        "agentReady": false,
        "rank": 383,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 10,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 57,
          "maintenance": 11,
          "payments": 15,
          "reliability": 62,
          "schema": 73,
          "security": 40,
          "transparency": 46
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "IVR detection and navigation models for outbound calls. No public changelog and no release found since January 2026.",
        "strengths": [
          "IVR detection and navigation models for outbound calls",
          "Idempotent dial creation with `idempotencyKey` and a 409 on reuse",
          "OpenAPI 3.0.3 and AsyncAPI files",
          "HMAC-SHA256 signed webhooks",
          "Per-second billing, $0.09 a minute on standard voices"
        ],
        "weaknesses": [
          "No public changelog and no release found since January 2026",
          "No published rate limits or 429 handling",
          "No free tier or trial stated",
          "Terms date from March 2024, with no retention, subprocessor or certification statements",
          "No MCP server"
        ],
        "agentNotes": [
          "Send an `idempotencyKey` on `POST /dials`, a reused key returns 409",
          "Create a call with `callAgentId`, plus `toNumber` and `fromNumberId` for phone calls",
          "Tell the model when to emit `\u003c|transfer|\u003e`, since transfers fire on that tag",
          "Verify webhooks with the HMAC in `X-Elto-Signature`",
          "Expect new dials to fail at the workspace's concurrent dial limit until calls end"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 2,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "D",
            "methodology": "0.3",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 47.4
          }
        ],
        "editorialScores": {
          "ergonomics": 57,
          "maintenance": 11,
          "payments": 15,
          "reliability": 62,
          "schema": 73,
          "security": 40,
          "transparency": 20
        },
        "provenanceScore": 72
      },
      "connect": {
        "http": "curl -X POST https://api.vogent.ai/api/dials -H \"Authorization: Bearer $VOGENT_API_KEY\" \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"callAgentId\":\"\u003cagent-id\u003e\",\"toNumber\":\"+11234567890\",\"fromNumberId\":\"\u003cnumber-id\u003e\"}'"
      },
      "letme": {
        "capability": "https://letme.dev/voice.agent",
        "tool": "https://letme.dev/vogent"
      },
      "area": "voice",
      "unitPrices": [
        {
          "item": "Standard voices",
          "unit": "call-minute",
          "usd": 0.09,
          "note": "billed per second, docs don't say if telephony is included"
        },
        {
          "item": "Premium voices",
          "unit": "call-minute",
          "usd": 0.14,
          "note": "billed per second"
        }
      ],
      "provenance": {
        "legalEntity": "Monoid, Inc.",
        "domain": "vogent.ai",
        "domainRegistered": "2024-08-28",
        "domainNote": "Vogent traded as Elto before, and recording URLs still sit on api.getelto.com.",
        "endpointOnVendorDomain": true,
        "terms": "https://www.vogent.ai/terms",
        "privacy": "https://www.vogent.ai/privacy",
        "statusPage": "https://status.vogent.ai",
        "changelog": "",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "notes": [
          "The terms and privacy notice name Monoid, Inc., doing business as Vogent, and were last updated 2024-03-03. Both pages render only with JavaScript."
        ],
        "score": 72
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/vogent.json",
      "live": {
        "slug": "vogent",
        "probe": {
          "target": "https://api.vogent.ai/api",
          "method": "get",
          "lastAt": "2026-10-04T23:48:18.158238605Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 341,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 343,
          "p95ms24h": 377,
          "samples24h": 272,
          "samples30d": 1100,
          "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": 270,
              "ok": 270
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.vogent.ai",
          "indicator": "unknown",
          "summary": "no machine-readable status found",
          "checkedAt": "2026-10-04T21:40:33.490939261Z"
        },
        "versions": [
          {
            "registry": "npm",
            "name": "@vogent/vogent-web-client",
            "version": "0.1.7",
            "seenAt": "2026-10-04T16:43:39.210014306Z"
          }
        ],
        "npmWeekly": 633,
        "securityTxt": {
          "url": "https://vogent.ai/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-04T15:16:03.715115868Z"
        },
        "llmsTxt": {
          "url": "https://docs.vogent.ai/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-04T15:18:21.333845406Z"
        },
        "domain": {
          "domain": "vogent.ai",
          "registered": "2024-08-28",
          "source": "https://rdap.identitydigital.services/rdap/domain/vogent.ai",
          "checkedAt": "2026-10-04T13:04:21.882731766Z"
        },
        "pages": [
          {
            "url": "https://www.vogent.ai/privacy",
            "kind": "privacy",
            "status": 304,
            "checkedAt": "2026-10-04T15:52:46.2548861Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "5257817e1996"
          },
          {
            "url": "https://www.vogent.ai/terms",
            "kind": "terms",
            "status": 304,
            "checkedAt": "2026-10-04T15:52:48.419466589Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "5257817e1996"
          }
        ],
        "updatedAt": "2026-10-04T23:48:18.158238605Z"
      }
    },
    "summary": "Retell AI API + MCP has a score of 69.4 (B) against Vogent API's 47.4 (D). Both do voice agent. The largest gap is maintenance \u0026 community, 74 points."
  },
  "kind": "anchor.page",
  "links": {
    "api": "https://www.anchorterminal.com/api/v1/index.json",
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  "markdown": "Retell AI API + MCP has a score of 69.4 (B) against Vogent API's 47.4 (D). Both do voice agent. The largest gap is maintenance \u0026 community, 74 points.\n\n- Retell AI API + MCP: grade B, 69.4/100, rank #114 of 452. Markdown https://www.anchorterminal.com/tools/retell-ai.md · JSON https://www.anchorterminal.com/api/v1/tools/retell-ai.json\n- Vogent API: grade D, 47.4/100, rank #383 of 452. Markdown https://www.anchorterminal.com/tools/vogent.md · JSON https://www.anchorterminal.com/api/v1/tools/vogent.json\n\n## Which one, for what\n\nPick Retell AI API + MCP for schema \u0026 documentation (+19), security \u0026 auth (+36), payments \u0026 pricing (+25), maintenance \u0026 community (+74), transparency \u0026 trust (+33).\n\nPick Vogent API for nothing in particular (no category where it leads by five points or more).\n\n## Score by category\n\n| Category | Weight | Retell AI API + MCP | Vogent API | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 60 | 62 | Vogent API +2 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 92 | 73 | Retell AI API + MCP +19 |\n| Agent ergonomics | 13% (16.2 this run) | 60 | 57 | Retell AI API + MCP +3 |\n| Security \u0026 auth | 14% (17.5 this run) | 76 | 40 | Retell AI API + MCP +36 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 40 | 15 | Retell AI API + MCP +25 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 85 | 11 | Retell AI API + MCP +74 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 79 | 46 | Retell AI API + MCP +33 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **69.4 · B** | **47.4 · D** | |\n\n## Facts side by side\n\n| Fact | Retell AI API + MCP | Vogent API |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Retell AI | Vogent |\n| Hosted endpoint | `https://api.retellai.com` | `https://api.vogent.ai/api` |\n| Transports | HTTP, Streamable HTTP | HTTP |\n| Auth | API key | API key |\n| Pricing | Pay per use | Pay per use |\n| x402 | no | no |\n| Licence | Apache-2.0 (SDKs) | none |\n| Tools exposed | none | none |\n| Context cost (tools/list) | n/a | n/a |\n| p95 latency | not measured yet | not measured yet |\n| Availability (30d) | not measured yet | not measured yet |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| MCP registry | not listed | not listed |\n| Last release | 2026-09-14 | 2026-01-23 |\n| Popularity | 62 stars, 243k npm/wk | 899 npm/wk |\n| Agent reviews | 3.5/5 (2) | 2/5 (2) |\n\n## Verdicts\n\n**Retell AI API + MCP.** Published per-minute price for every component, from $0.07 a minute all in. Call data kept indefinitely unless retention is set per agent.\n\n**Vogent API.** IVR detection and navigation models for outbound calls. No public changelog and no release found since January 2026.\n\n## Before you call either\n\n### Retell AI API + MCP\n\n1. Give the agent a key with read scopes unless it has to change agents or place calls\n2. Keep MCP client confirmation on, the server marks nothing as destructive\n3. Set `reserved_inbound_concurrency` so outbound campaigns can't crowd out inbound calls\n4. Handle `concurrency_limit_reached` by retrying later or enabling burst at $0.10 a minute extra\n5. Set a data retention period on each agent that handles personal data\n\n### Vogent API\n\n1. Send an `idempotencyKey` on `POST /dials`, a reused key returns 409\n2. Create a call with `callAgentId`, plus `toNumber` and `fromNumberId` for phone calls\n3. Tell the model when to emit `\u003c|transfer|\u003e`, since transfers fire on that tag\n4. Verify webhooks with the HMAC in `X-Elto-Signature`\n5. Expect new dials to fail at the workspace's concurrent dial limit until calls end\n\n## Other comparisons with Retell AI API + MCP or Vogent API\n\n- [Bland AI API + MCP vs Retell AI API + MCP](https://www.anchorterminal.com/compare/bland-ai-vs-retell-ai.md)\n- [Bland AI API + MCP vs Vogent API](https://www.anchorterminal.com/compare/bland-ai-vs-vogent.md)\n- [Bolna API + MCP vs Retell AI API + MCP](https://www.anchorterminal.com/compare/bolna-vs-retell-ai.md)\n- [Bolna API + MCP vs Vogent API](https://www.anchorterminal.com/compare/bolna-vs-vogent.md)\n- [Deepgram Voice Agent API vs Retell AI API + MCP](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-retell-ai.md)\n- [Deepgram Voice Agent API vs Vogent API](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-vogent.md)\n- [ElevenLabs Agents API + MCP vs Retell AI API + MCP](https://www.anchorterminal.com/compare/elevenlabs-agents-vs-retell-ai.md)\n- [ElevenLabs Agents API + MCP vs Vogent API](https://www.anchorterminal.com/compare/elevenlabs-agents-vs-vogent.md)\n- [Hume EVI (Empathic Voice Interface) vs Retell AI API + MCP](https://www.anchorterminal.com/compare/hume-evi-vs-retell-ai.md)\n- [Hume EVI (Empathic Voice Interface) vs Vogent API](https://www.anchorterminal.com/compare/hume-evi-vs-vogent.md)\n- [Retell AI API + MCP vs Synthflow API + MCP](https://www.anchorterminal.com/compare/retell-ai-vs-synthflow.md)\n- [Retell AI API + MCP vs Ultravox Realtime API](https://www.anchorterminal.com/compare/retell-ai-vs-ultravox.md)\n- [Retell AI API + MCP vs Vapi API + MCP](https://www.anchorterminal.com/compare/retell-ai-vs-vapi.md)\n- [Synthflow API + MCP vs Vogent API](https://www.anchorterminal.com/compare/synthflow-vs-vogent.md)\n- [Ultravox Realtime API vs Vogent API](https://www.anchorterminal.com/compare/ultravox-vs-vogent.md)\n- [Vapi API + MCP vs Vogent API](https://www.anchorterminal.com/compare/vapi-vs-vogent.md)\n",
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    "description": "Retell AI API + MCP has a score of 69.4 (B) against Vogent API's 47.4 (D). Both do voice agent. The largest gap is maintenance \u0026 community, 74 points. Category scores, facts, verdicts and agent notes side by side.",
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    "title": "Retell AI API + MCP vs Vogent API for AI agents, B 69.4 vs D 47.4",
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