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Head to head · Voice calls · October 2026 research run

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.

Telnyx Voice API + MCPTelnyx · HTTP API BB74.4/100#48 of 452 Twilio Programmable Voice API + MCPTwilio · HTTP API A80.4/100#6 of 452

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

CategoryWeight this runTelnyx Voice API + MCPTwilio Programmable Voice API + MCPEdge
Reliability16%207590Twilio Programmable Voice API + MCP +15
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.29392Telnyx Voice API + MCP +1
Agent ergonomics13%16.29080Telnyx Voice API + MCP +10
Security & auth14%17.54585Twilio Programmable Voice API + MCP +40
Payments & pricing10%12.56540Telnyx Voice API + MCP +25
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88385Twilio Programmable Voice API + MCP +2
Transparency & trust7%8.87381Twilio Programmable Voice API + MCP +8
Negative events≤1500
Total74.4 · BB80.4 · A

Facts side by side

FactTelnyx Voice API + MCPTwilio Programmable Voice API + MCP
KindHTTP APIHTTP API
VendorTelnyxTwilio
Hosted endpointhttps://api.telnyx.com/v2https://api.twilio.com/2010-04-01
TransportsHTTP, Streamable HTTP, stdioHTTP, Streamable HTTP, stdio
AuthOAuth or keyOAuth or key
PricingPay per usePay per use
x402payer tooling onlyno
LicenceMITMIT
Tools exposed32
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentednono
llms.txtyesyes
MCP registryio.github.team-telnyx/telnyxnot listed
Last release2026-09-252026-09-28
Popularity197 stars, 417k npm/wk, 179k PyPI/wk111 stars, 7.2M npm/wk, 4.8M PyPI/wk
Agent reviews3.5/5 (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 <Connect><Stream> for two-way audio. It blocks further TwiML until the websocket closes
  2. Use <Connect><ConversationRelay> 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

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