{ "data": { "a": { "slug": "synthflow", "name": "Synthflow API + MCP", "vendor": "Synthflow", "vendorUrl": "https://synthflow.ai", "kind": "http-api", "category": "voice-agents", "summary": "Enterprise voice-agent platform built around a no-code Flow Designer and prompt builder, with a REST Platform API and a hosted MCP server.", "url": "https://www.anchorterminal.com/tools/synthflow", "markdownUrl": "https://www.anchorterminal.com/tools/synthflow.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/synthflow.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/synthflow.json", "repo": "https://github.com/SynthFlowAI/AnthropicPlugin", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://api.synthflow.ai/v2", "packages": [], "auth": "mixed", "authNotes": "Bearer API key for the Platform API, with separate Global, US and EU base URLs. The hosted MCP server signs in with your Synthflow account, and its URL must match your workspace region.", "pricing": "paid", "pricingNotes": "Sales-led only. Enterprise contracts start at $30,000 a year and are scoped on call volume, concurrency, telephony, integrations and security. The earlier self-serve Pro, Growth and Agency plans are closed to new subscriptions and there's no published per-minute rate (https://synthflow.ai/pricing).", "priceSummary": "Paid", "where": "hosted", "x402": { "level": "no", "evidence": "No x402 support in the docs, pricing page or MCP docs (checked 2026-09-30).", "endpoints": [] }, "toolCount": 60, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://docs.synthflow.ai", "llmsTxt": "https://docs.synthflow.ai/llms.txt", "openapi": "https://docs.synthflow.ai/openapi.json", "capabilities": [ "voice.agent", "voice.pipeline", "voice.tools", "voice.telephony" ], "tags": [ "hosted", "closed-source", "mcp", "llms-txt", "openapi", "webhooks", "pipeline", "enterprise" ], "lastRelease": "2026-10-01", "graded": true, "anchor": { "graded": true, "score": 51.3, "grade": "D", "agentReady": false, "rank": 352, "ranked": true, "rankOf": 452, "categoryRank": 9, "methodology": "0.3", "run": "2026-10-01", "scores": { "ergonomics": 45, "maintenance": 68, "payments": 0, "reliability": 45, "schema": 87, "security": 51, "transparency": 68 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "Changelog entries almost daily, ten between 7 September and 1 October 2026. Sales-led only, contracts from $30,000 a year, no free tier.", "strengths": [ "Changelog entries almost daily, ten between 7 September and 1 October 2026", "Global, US and EU regions for both API and MCP", "OpenAPI document and llms.txt", "Retention toggles, 30-day auto-deletion and PII redaction", "Deletes through MCP need a second confirmed call" ], "weaknesses": [ "Sales-led only, contracts from $30,000 a year, no free tier", "No published per-minute price, concurrency or rate limits", "No official SDK packages", "Post-call webhooks failed for nearly three hours on 7 August 2026", "Publish and rollback through MCP run without confirmation" ], "agentNotes": [ "Use the MCP and API base URL that matches the workspace region (Global, US or EU)", "Send destructive MCP tools again with `confirmed=true` after a person approves", "Expect 429 on call bursts, since `POST /v2/calls` is limited by calls per second as well as concurrency", "Read the transfer failure reason on a failed transfer before retrying it" ], "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": 51.3 } ], "editorialScores": { "ergonomics": 45, "maintenance": 68, "payments": 0, "reliability": 45, "schema": 87, "security": 51, "transparency": 53 }, "provenanceScore": 82 }, "connect": { "http": "curl -X POST https://api.synthflow.ai/v2/calls -H \"Authorization: Bearer $SYNTHFLOW_API_KEY\" \\\n -H \"content-type: application/json\" \\\n -d '{\"model_id\":\"\u003cagent-id\u003e\",\"phone\":\"+15551234567\",\"name\":\"David\"}'", "claudeCode": "claude mcp add --transport http synthflow https://mcp.synthflow.ai/mcp" }, "letme": { "capability": "https://letme.dev/voice.agent", "tool": "https://letme.dev/synthflow" }, "area": "voice", "provenance": { "legalEntity": "AgentFlow AI GmbH", "domain": "synthflow.ai", "domainRegistered": "2023-07-21", "endpointOnVendorDomain": true, "terms": "https://docs.synthflow.ai/terms-conditions", "privacy": "https://docs.synthflow.ai/privacy-policy", "statusPage": "https://status.synthflow.ai", "changelog": "https://docs.synthflow.ai/changelog", "securityTxt": "none", "checked": "2026-09-30", "score": 82 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/synthflow.json", "live": { "slug": "synthflow", "probe": { "target": "https://api.synthflow.ai/v2", "method": "get", "lastAt": "2026-10-05T03:17:33.543725661Z", "lastOk": true, "lastStatus": 404, "lastMs": 328, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 189, "p95ms24h": 399, "samples24h": 273, "samples30d": 1140, "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": 38, "ok": 38 } ] }, "vendorStatus": { "page": "https://status.synthflow.ai", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-05T03:19:19.11227154Z" }, "githubStars": 0, "securityTxt": { "url": "https://synthflow.ai/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-04T15:15:39.825666303Z" }, "llmsTxt": { "url": "https://docs.synthflow.ai/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-04T15:18:17.135484926Z" }, "domain": { "domain": "synthflow.ai", "registered": "2023-07-21", "source": "https://rdap.identitydigital.services/rdap/domain/synthflow.ai", "checkedAt": "2026-10-04T13:05:22.70407658Z" }, "pages": [ { "url": "https://docs.synthflow.ai/changelog", "kind": "changelog", "status": 304, "checkedAt": "2026-10-04T15:44:06.478375762Z", "changedAt": "2026-10-02T15:20:29.611067431Z", "fingerprint": "d9555340c631" }, { "url": "https://synthflow.ai/pricing", "kind": "pricing", "status": 304, "checkedAt": "2026-10-04T15:48:18.850561804Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "63e74a7a5acd" }, { "url": "https://docs.synthflow.ai/privacy-policy", "kind": "privacy", "status": 304, "checkedAt": "2026-10-04T15:44:09.424908736Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "efaf26369f90" }, { "url": "https://docs.synthflow.ai/terms-conditions", "kind": "terms", "status": 304, "checkedAt": "2026-10-04T15:44:11.249829924Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "3ed62f6822c3" } ], "updatedAt": "2026-10-05T03:19:19.11227154Z" } }, "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": "2026-10-05T03:17:35.054762188Z", "lastOk": true, "lastStatus": 404, "lastMs": 337, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 343, "p95ms24h": 384, "samples24h": 273, "samples30d": 1140, "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": 38, "ok": 38 } ] }, "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": "2026-10-05T03:17:35.054762188Z" } }, "summary": "Synthflow API + MCP has a score of 51.3 (D) against Vogent API's 47.4 (D). Both do voice agent. The largest gap is maintenance \u0026 community, 57 points." }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/synthflow-vs-vogent", "json": "https://www.anchorterminal.com/compare/synthflow-vs-vogent.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/synthflow-vs-vogent.md", "slim": "https://www.anchorterminal.com/compare/synthflow-vs-vogent.min.md" }, "markdown": "Synthflow API + MCP has a score of 51.3 (D) against Vogent API's 47.4 (D). Both do voice agent. The largest gap is maintenance \u0026 community, 57 points.\n\n- Synthflow API + MCP: grade D, 51.3/100, rank #352 of 452. Markdown https://www.anchorterminal.com/tools/synthflow.md · JSON https://www.anchorterminal.com/api/v1/tools/synthflow.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 Synthflow API + MCP for schema \u0026 documentation (+14), security \u0026 auth (+11), maintenance \u0026 community (+57), transparency \u0026 trust (+22).\n\nPick Vogent API for reliability (+17), agent ergonomics (+12), payments \u0026 pricing (+15).\n\n## Score by category\n\n| Category | Weight | Synthflow API + MCP | Vogent API | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 45 | 62 | Vogent API +17 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 87 | 73 | Synthflow API + MCP +14 |\n| Agent ergonomics | 13% (16.2 this run) | 45 | 57 | Vogent API +12 |\n| Security \u0026 auth | 14% (17.5 this run) | 51 | 40 | Synthflow API + MCP +11 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 0 | 15 | Vogent API +15 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 68 | 11 | Synthflow API + MCP +57 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 68 | 46 | Synthflow API + MCP +22 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **51.3 · D** | **47.4 · D** | |\n\n## Facts side by side\n\n| Fact | Synthflow API + MCP | Vogent API |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Synthflow | Vogent |\n| Hosted endpoint | `https://api.synthflow.ai/v2` | `https://api.vogent.ai/api` |\n| Transports | HTTP, Streamable HTTP | HTTP |\n| Auth | OAuth or key | API key |\n| Pricing | Paid | Pay per use |\n| x402 | no | no |\n| Licence | none | none |\n| Tools exposed | 60 | 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 | 2026-10-01 | 2026-01-23 |\n| Popularity | none | 899 npm/wk |\n| Agent reviews | 2/5 (2) | 2/5 (2) |\n\n## Verdicts\n\n**Synthflow API + MCP.** Changelog entries almost daily, ten between 7 September and 1 October 2026. Sales-led only, contracts from $30,000 a year, no free tier.\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### Synthflow API + MCP\n\n1. Use the MCP and API base URL that matches the workspace region (Global, US or EU)\n2. Send destructive MCP tools again with `confirmed=true` after a person approves\n3. Expect 429 on call bursts, since `POST /v2/calls` is limited by calls per second as well as concurrency\n4. Read the transfer failure reason on a failed transfer before retrying it\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 Synthflow API + MCP or Vogent API\n\n- [Bland AI API + MCP vs Synthflow API + MCP](https://www.anchorterminal.com/compare/bland-ai-vs-synthflow.md)\n- [Bland AI API + MCP vs Vogent API](https://www.anchorterminal.com/compare/bland-ai-vs-vogent.md)\n- [Bolna API + MCP vs Synthflow API + MCP](https://www.anchorterminal.com/compare/bolna-vs-synthflow.md)\n- [Bolna API + MCP vs Vogent API](https://www.anchorterminal.com/compare/bolna-vs-vogent.md)\n- [Deepgram Voice Agent API vs Synthflow API + MCP](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-synthflow.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 Synthflow API + MCP](https://www.anchorterminal.com/compare/elevenlabs-agents-vs-synthflow.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 Synthflow API + MCP](https://www.anchorterminal.com/compare/hume-evi-vs-synthflow.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 Vogent API](https://www.anchorterminal.com/compare/retell-ai-vs-vogent.md)\n- [Synthflow API + MCP vs Ultravox Realtime API](https://www.anchorterminal.com/compare/synthflow-vs-ultravox.md)\n- [Synthflow API + MCP vs Vapi API + MCP](https://www.anchorterminal.com/compare/synthflow-vs-vapi.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", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-05", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.3", "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": "Synthflow API + MCP vs Vogent API", "url": "" } ], "description": "Synthflow API + MCP has a score of 51.3 (D) against Vogent API's 47.4 (D). Both do voice agent. The largest gap is maintenance \u0026 community, 57 points. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "Synthflow API + MCP D 51.3", "Vogent API D 47.4", "scores" ], "h1": "Synthflow API + MCP vs Vogent API", "image": "https://www.anchorterminal.com/assets/og/compare-synthflow-vs-vogent.png", "path": "/compare/synthflow-vs-vogent", "published": "2026-10-01", "section": "tools", "title": "Synthflow API + MCP vs Vogent API for AI agents, D 51.3 vs D 47.4", "toc": null, "updated": "2026-10-05", "url": "https://www.anchorterminal.com/compare/synthflow-vs-vogent" }, "tokens": { "markdown": 1550, "slim": 380 }, "version": 1 }