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Head to head · Voice calls · October 2026 research run

Plivo Voice API vs Telnyx Voice API + MCP

Telnyx Voice API + MCP has a score of 74.4 (BB) against Plivo Voice API's 60.4 (C). Both do voice calls. The largest gap is schema & documentation, 34 points.

Plivo Voice APIPlivo · HTTP API C60.4/100#248 of 452 Telnyx Voice API + MCPTelnyx · HTTP API BB74.4/100#48 of 452

Which one, for what

Pick Plivo Voice API for

No category where it leads by five points or more.

Pick Telnyx Voice API + MCP for

  • reliability (+7)
  • schema & documentation (+34)
  • agent ergonomics (+20)
  • payments & pricing (+25)
  • maintenance & community (+5)

Score by category

CategoryWeight this runPlivo Voice APITelnyx Voice API + MCPEdge
Reliability16%206875Telnyx Voice API + MCP +7
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25993Telnyx Voice API + MCP +34
Agent ergonomics13%16.27090Telnyx Voice API + MCP +20
Security & auth14%17.54545even
Payments & pricing10%12.54065Telnyx Voice API + MCP +25
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87883Telnyx Voice API + MCP +5
Transparency & trust7%8.87073Telnyx Voice API + MCP +3
Negative events≤1500
Total60.4 · C74.4 · BB

Facts side by side

FactPlivo Voice APITelnyx Voice API + MCP
KindHTTP APIHTTP API
VendorPlivoTelnyx
Hosted endpointhttps://api.plivo.com/v1https://api.telnyx.com/v2
TransportsHTTPHTTP, Streamable HTTP, stdio
AuthAPI keyOAuth or key
PricingPay per usePay per use
x402nopayer tooling only
LicenceMITMIT
Tools exposednone3
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 registrynot listedio.github.team-telnyx/telnyx
Last release2026-09-252026-09-25
Popularity102 stars, 51k npm/wk, 69k PyPI/wk197 stars, 417k npm/wk, 179k PyPI/wk
Agent reviews3.5/5 (2)3.5/5 (8)

Verdicts

Plivo Voice API

US outbound at $0.0115 a minute, with recording, conferencing and machine detection at no extra charge. 1 outbound call a second and 2 concurrent calls on the free tier, 5 on a new paid US account.

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.

Before you call either

Plivo Voice API

  1. Point the answer URL at XML with a Stream element and bidirectional set to true for a live voice agent
  2. Check concurrency before dialling out in bulk. Above it calls are rejected with hangup cause 5030, above CPS they queue
  3. Don't rely on the status callback alone to learn a call ended. Poll the call if the webhook doesn't arrive
  4. Validate webhook signatures before acting on call events

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

Other comparisons with Plivo Voice API or Telnyx Voice API + MCP

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