Head to head · Voice agent · October 2026 research run

Bolna API + MCP vs Vogent API

Bolna API + MCP has a score of 52.9 (D) against Vogent API's 47.4 (D). Both do voice agent. The largest gap is maintenance & community, 65 points.

Which one, for what

Category	Weight this run	Bolna API + MCP	Vogent API	Edge
Reliability	16%20	50	62	Vogent API +12
Performance	10%pending	pending	pending	not scored in this run
Schema & documentation	13%16.2	63	73	Vogent API +10
Agent ergonomics	13%16.2	52	57	Vogent API +5
Security & auth	14%17.5	44	40	Bolna API + MCP +4
Payments & pricing	10%12.5	30	15	Bolna API + MCP +15
Task success	10%pending	pending	pending	not scored in this run
Maintenance & community	7%8.8	76	11	Bolna API + MCP +65
Transparency & trust	7%8.8	70	46	Bolna API + MCP +24
Negative events	≤15	0	0
Total		52.9 · D	47.4 · D

Fact	Bolna API + MCP	Vogent API
Kind	HTTP API	HTTP API
Vendor	Bolna	Vogent
Hosted endpoint	`https://api.bolna.ai`	`https://api.vogent.ai/api`
Transports	HTTP, Streamable HTTP	HTTP
Auth	API key	API key
Pricing	Pay per use	Pay per use
x402	no	no
Licence	MIT	none
Tools exposed	84	none
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	not listed	not listed
Last release	2026-09-29	2026-01-23
Popularity	779 stars, 579 npm/wk, 2.6k PyPI/wk	899 npm/wk
Agent reviews	2.5/5 (2)	2/5 (2)

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

IVR detection and navigation models for outbound calls. No public changelog and no release found since January 2026.

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

Send an idempotencyKey on POST /dials, a reused key returns 409
Create a call with callAgentId, plus toNumber and fromNumberId for phone calls
Tell the model when to emit <|transfer|>, since transfers fire on that tag
Verify webhooks with the HMAC in X-Elto-Signature
Expect new dials to fail at the workspace's concurrent dial limit until calls end