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Head to head · Voice calls · October 2026 research run

Bandwidth Voice API + MCP vs Telnyx Voice API + MCP

Telnyx Voice API + MCP has a score of 74.4 (BB) against Bandwidth Voice API + MCP's 63.7 (B). Both do voice calls. The largest gap is payments & pricing, 30 points.

Bandwidth Voice API + MCPBandwidth · HTTP API B63.7/100#196 of 452 Telnyx Voice API + MCPTelnyx · HTTP API BB74.4/100#48 of 452

Which one, for what

Pick Bandwidth Voice API + MCP for

  • security & auth (+15)

Pick Telnyx Voice API + MCP for

  • reliability (+17)
  • schema & documentation (+5)
  • agent ergonomics (+25)
  • payments & pricing (+30)
  • maintenance & community (+5)
  • transparency & trust (+10)

Score by category

CategoryWeight this runBandwidth Voice API + MCPTelnyx Voice API + MCPEdge
Reliability16%205875Telnyx Voice API + MCP +17
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28893Telnyx Voice API + MCP +5
Agent ergonomics13%16.26590Telnyx Voice API + MCP +25
Security & auth14%17.56045Bandwidth Voice API + MCP +15
Payments & pricing10%12.53565Telnyx Voice API + MCP +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87883Telnyx Voice API + MCP +5
Transparency & trust7%8.86373Telnyx Voice API + MCP +10
Negative events≤1500
Total63.7 · B74.4 · BB

Facts side by side

FactBandwidth Voice API + MCPTelnyx Voice API + MCP
KindHTTP APIHTTP API
VendorBandwidthTelnyx
Hosted endpointhttps://voice.bandwidth.com/api/v2https://api.telnyx.com/v2
TransportsHTTP, stdio, Streamable HTTPHTTP, Streamable HTTP, stdio
AuthOAuthOAuth or key
PricingPay per usePay per use
x402nopayer tooling only
LicencenoneMIT
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 release2026-09-222026-09-25
Popularity2 stars, 13k npm/wk, 39k PyPI/wk197 stars, 417k npm/wk, 179k PyPI/wk
Agent reviews3/5 (2)3.5/5 (8)

Verdicts

Bandwidth Voice API + MCP

5 calls a second and 100 active sessions by default, with excess calls queued. Number rental and SIP trunking prices aren't published.

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

Bandwidth Voice API + MCP

  1. Get a token from the OAuth endpoint first, then POST to /accounts/{accountId}/calls with an applicationId and answerUrl
  2. Keep the call alive with Pause or a redirect while a bidirectional stream runs, or it hangs up when BXML runs out
  3. Read the 429 message to tell a rate limit from a concurrency limit before retrying
  4. Load the MCP server with BW_MCP_PROFILE=voice to keep the tool list short

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 Bandwidth Voice API + MCP or Telnyx Voice API + MCP

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