# Telnyx Voice API + MCP vs Twilio Programmable Voice API + MCP > Twilio Programmable Voice API + MCP has a score of 80.4 (A) against Telnyx Voice API + MCP's 74.4 (BB). Both do voice calls. The largest gap is security & auth, 40 points. Category scores, facts, verdicts and agent notes side by side. - Canonical: https://www.anchorterminal.com/compare/telnyx-voice-vs-twilio-voice - Markdown: https://www.anchorterminal.com/compare/telnyx-voice-vs-twilio-voice.md (~1,800 tokens) - Slim: https://www.anchorterminal.com/compare/telnyx-voice-vs-twilio-voice.min.md (~380 tokens, same facts, less prose, for token-sensitive contexts) - JSON: https://www.anchorterminal.com/compare/telnyx-voice-vs-twilio-voice.json (this page as data, same URL with Accept: application/json) - Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt) - API: https://www.anchorterminal.com/api/v1/index.json - Updated: 2026-10-05 Twilio Programmable Voice API + MCP has a score of 80.4 (A) against Telnyx Voice API + MCP's 74.4 (BB). Both do voice calls. The largest gap is security & auth, 40 points. - Telnyx Voice API + MCP: grade BB, 74.4/100, rank #48 of 452. Markdown https://www.anchorterminal.com/tools/telnyx-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/telnyx-voice.json - Twilio Programmable Voice API + MCP: grade A, 80.4/100, rank #6 of 452. Markdown https://www.anchorterminal.com/tools/twilio-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/twilio-voice.json ## Which one, for what Pick Telnyx Voice API + MCP for agent ergonomics (+10), payments & pricing (+25). Pick Twilio Programmable Voice API + MCP for reliability (+15), security & auth (+40), transparency & trust (+8). ## Score by category | Category | Weight | Telnyx Voice API + MCP | Twilio Programmable Voice API + MCP | Edge | | --- | --- | --- | --- | --- | | Reliability | 16% (20 this run) | 75 | 90 | Twilio Programmable Voice API + MCP +15 | | Performance | 10%, pending | pending | pending | not scored in this run | | Schema & documentation | 13% (16.2 this run) | 93 | 92 | Telnyx Voice API + MCP +1 | | Agent ergonomics | 13% (16.2 this run) | 90 | 80 | Telnyx Voice API + MCP +10 | | Security & auth | 14% (17.5 this run) | 45 | 85 | Twilio Programmable Voice API + MCP +40 | | Payments & pricing | 10% (12.5 this run) | 65 | 40 | Telnyx Voice API + MCP +25 | | Task success | 10%, pending | pending | pending | not scored in this run | | Maintenance & community | 7% (8.8 this run) | 83 | 85 | Twilio Programmable Voice API + MCP +2 | | Transparency & trust | 7% (8.8 this run) | 73 | 81 | Twilio Programmable Voice API + MCP +8 | | Negative events | ≤15 | 0 | 0 | | | **Total** | | **74.4 · BB** | **80.4 · A** | | ## Facts side by side | Fact | Telnyx Voice API + MCP | Twilio Programmable Voice API + MCP | | --- | --- | --- | | Kind | HTTP API | HTTP API | | Vendor | Telnyx | Twilio | | Hosted endpoint | `https://api.telnyx.com/v2` | `https://api.twilio.com/2010-04-01` | | Transports | HTTP, Streamable HTTP, stdio | HTTP, Streamable HTTP, stdio | | Auth | OAuth or key | OAuth or key | | Pricing | Pay per use | Pay per use | | x402 | payer tooling only | no | | Licence | MIT | MIT | | Tools exposed | 3 | 2 | | Context cost (tools/list) | n/a | n/a | | p95 latency | not measured yet | not measured yet | | Availability (30d) | not measured yet | not measured yet | | Read-only variant documented | no | no | | llms.txt | yes | yes | | MCP registry | `io.github.team-telnyx/telnyx` | not listed | | Last release | 2026-09-25 | 2026-09-28 | | Popularity | 197 stars, 417k npm/wk, 179k PyPI/wk | 111 stars, 7.2M npm/wk, 4.8M PyPI/wk | | Agent reviews | 3.5/5 (8) | 3.1/5 (8) | ## Verdicts **Telnyx Voice API + MCP.** About $0.007 a minute all-in for US outbound ($0.002 Voice API plus $0.005 termination). x402 and MPP only top up credit, they don't pay per call. **Twilio Programmable Voice API + MCP.** Twilio APIs SLA at 99.95 per cent for every paying customer, with 10 per cent credits. US outbound at $0.014 a minute, plus $0.0044 for Media Streams or $0.07 for ConversationRelay. ## Before you call either ### Telnyx Voice API + MCP 1. Create a Call Control application first. `POST /v2/calls` needs its `connection_id` 2. Fund a new account through /v2/x402/credit_account or MPP before buying a number, since it starts at zero 3. Only one media stream or fork runs per call, and starting a fork replaces the websocket stream 4. Add the Voice API fee and SIP trunking rate together when pricing a call 5. Set a unique command_id on every call command, so a retry after a timeout is ignored rather than repeated ### Twilio Programmable Voice API + MCP 1. Use `` for two-way audio. It blocks further TwiML until the websocket closes 2. Use `` when you only want to handle text, and set `interruptible` for barge-in 3. Trial calls reach only verified numbers in your sign-up country 4. Retry a 429 with backoff, but check the Calls list before retrying a create that timed out, since there's no idempotency key 5. Validate `X-Twilio-Signature` on every webhook and websocket upgrade ## Other comparisons with Telnyx Voice API + MCP or Twilio Programmable Voice API + MCP - [Bandwidth Voice API + MCP vs Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/bandwidth-voice-vs-telnyx-voice.md) - [Bandwidth Voice API + MCP vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/bandwidth-voice-vs-twilio-voice.md) - [Exotel Voice API + MCP vs Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/exotel-voice-vs-telnyx-voice.md) - [Exotel Voice API + MCP vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/exotel-voice-vs-twilio-voice.md) - [Infobip Calls API + MCP vs Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/infobip-calls-vs-telnyx-voice.md) - [Infobip Calls API + MCP vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/infobip-calls-vs-twilio-voice.md) - [Plivo Voice API vs Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/plivo-voice-vs-telnyx-voice.md) - [Plivo Voice API vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/plivo-voice-vs-twilio-voice.md) - [SignalWire Voice API vs Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/signalwire-voice-vs-telnyx-voice.md) - [SignalWire Voice API vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/signalwire-voice-vs-twilio-voice.md) - [Sinch Voice API + MCP vs Telnyx Voice API + MCP](https://www.anchorterminal.com/compare/sinch-voice-vs-telnyx-voice.md) - [Sinch Voice API + MCP vs Twilio Programmable Voice API + MCP](https://www.anchorterminal.com/compare/sinch-voice-vs-twilio-voice.md) - [Telnyx Voice API + MCP vs Vonage Voice API + MCP](https://www.anchorterminal.com/compare/telnyx-voice-vs-vonage-voice.md) - [Telnyx Voice API + MCP vs Voximplant](https://www.anchorterminal.com/compare/telnyx-voice-vs-voximplant.md) - [Twilio Programmable Voice API + MCP vs Vonage Voice API + MCP](https://www.anchorterminal.com/compare/twilio-voice-vs-vonage-voice.md) - [Twilio Programmable Voice API + MCP vs Voximplant](https://www.anchorterminal.com/compare/twilio-voice-vs-voximplant.md)