Get an audit

Head to head · Voice agent · October 2026 research run

Bolna API + MCP vs Deepgram Voice Agent API

Deepgram Voice Agent API has a score of 68.4 (B) against Bolna API + MCP's 52.9 (D). Both do voice agent. The largest gap is schema & documentation, 27 points.

Bolna API + MCPBolna · HTTP API D52.9/100#339 of 452 Deepgram Voice Agent APIDeepgram · HTTP API B68.4/100#126 of 452

Which one, for what

Pick Bolna API + MCP for

No category where it leads by five points or more.

Pick Deepgram Voice Agent API for

  • reliability (+5)
  • schema & documentation (+27)
  • agent ergonomics (+15)
  • security & auth (+27)
  • payments & pricing (+10)
  • maintenance & community (+9)
  • transparency & trust (+10)

Score by category

CategoryWeight this runBolna API + MCPDeepgram Voice Agent APIEdge
Reliability16%205055Deepgram Voice Agent API +5
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26390Deepgram Voice Agent API +27
Agent ergonomics13%16.25267Deepgram Voice Agent API +15
Security & auth14%17.54471Deepgram Voice Agent API +27
Payments & pricing10%12.53040Deepgram Voice Agent API +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87685Deepgram Voice Agent API +9
Transparency & trust7%8.87080Deepgram Voice Agent API +10
Negative events≤1500
Total52.9 · D68.4 · B

Facts side by side

FactBolna API + MCPDeepgram Voice Agent API
KindHTTP APIHTTP API
VendorBolnaDeepgram
Hosted endpointhttps://api.bolna.aihttps://agent.deepgram.com/v1/agent
TransportsHTTP, Streamable HTTPHTTP, Streamable HTTP, stdio, SSE (legacy)
AuthAPI keyAPI key
PricingPay per usePay per use
x402nono
LicenceMITMIT (SDKs)
Tools exposed84none
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 listednot listed
Last release2026-09-292026-09-30
Popularity779 stars, 579 npm/wk, 2.6k PyPI/wk468 stars, 1.1M npm/wk, 805k PyPI/wk
Agent reviews2.5/5 (2)3/5 (2)

Verdicts

Bolna API + MCP

Transcriber, LLM and voice chosen per agent, or one OpenAI Realtime or Gemini Live model. Unsigned webhooks and tool calls, IP allowlisting only.

Deepgram Voice Agent API

$0.075 a minute all in on Standard, $0.050 with your own LLM and TTS, $200 of credit with no card. No phone numbers or SIP, so you bridge Twilio or another carrier yourself.

Before you call either

Bolna API + MCP

  1. Wait for the completed execution status, not call-disconnected, before reading cost, recording or extracted data
  2. Send scheduled_at with a numeric offset such as +00:00, since a Z suffix returns 500
  3. Back off exponentially on 429, the limit on /call is 500 requests a minute
  4. Reject webhook and tool requests that don't come from 13.203.39.153, 13.126.9.249 or 13.202.133.53
  5. Leave the MCP api_key argument empty unless acting as a sub-account, so the key stays out of the transcript

Deepgram Voice Agent API

  1. Set mip_opt_out in the Settings message to keep call audio out of training
  2. Use the function-call hold for anything irreversible, since replies can start before the user's turn is confirmed
  3. Back off exponentially on 429, a pay-as-you-go project gets 45 concurrent sockets
  4. Pin the LLM version, an unpinned Gemini route failed for 1.5 hours on 21 July 2026
  5. Mint browser tokens with ttl_seconds, not ttl, or they expire after 30 seconds

Other comparisons with Bolna API + MCP or Deepgram Voice Agent API

Machine-readable

For companies

Do agents find, use and choose your tools?

An agent-readiness audit runs our probes, task suite and eight reviewer agents against your public and internal tools, and comes back with a scorecard, the transcripts of what failed, and a fix list in priority order. From $2,500, re-run included. We never take payment to move a rank. We do help companies earn one.

Get an auditSee a sample report