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Head to head · Voice agent · October 2026 research run

Bolna API + MCP vs Vocily AI

Vocily AI scores 54 (C) on agent readiness against Bolna API + MCP's 52.6 (D), and leads in 4 of 7 scored categories. Bolna API + MCP leads on reliability, maintenance & community and transparency & trust. Both do voice agent.

Bolna API + MCPBolna · HTTP API D52.6/100#492 of 629 Vocily AIVocily AI Private Limited · HTTP API C54/100#476 of 629

Which one, for what

Bolna API + MCP D

Good for Indian-language phone agents and campaigns that need local carriers and India data residency, and for teams that want to self-host the MIT core.

Ahead on

  • Reliability, 50 against 40
  • Maintenance & community, 76 against 61
  • Transparency & trust, 66 against 50

Also in its favour

  • Open source
  • No incidents deducted, where Vocily AI loses 5 points for them

Watch for

Unsigned webhooks and tool calls, IP allowlisting only

Vocily AI C

Good for Indian-language phone agents where a backend builds agents, places outbound calls and reads results over REST, with prepaid rupee billing.

Ahead on

  • Schema & documentation, 90 against 63
  • Agent ergonomics, 84 against 52
  • Payments & pricing, 40 against 30

Watch for

No status page, incident history or SLA was found

Score by category

CategoryWeight this runBolna API + MCPVocily AIEdge
Reliability16%205040Bolna API + MCP +10
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26390Vocily AI +27
Agent ergonomics13%16.25284Vocily AI +32
Security & auth14%17.54446Vocily AI +2
Payments & pricing10%12.53040Vocily AI +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87661Bolna API + MCP +15
Transparency & trust7%8.86650Bolna API + MCP +16
Negative events≤150-5
Total52.6 · D54 · C

Facts side by side

FactBolna API + MCPVocily AI
KindHTTP APIHTTP API
VendorBolnaVocily AI Private Limited
Hosted endpointhttps://api.bolna.aihttps://api.vocily.ai
TransportsHTTP, Streamable HTTPHTTP
AuthAPI keyAPI key
PricingPay per usePay per use
x402nono
LicenceMITProprietary service under Vocily's terms of service. No open-source code or published package was found
Tools exposed84none
Read-only variant documentednono
llms.txtyesyes
Last release2026-09-292026-09-30
Terms last updated2026-08-13
Privacy policy last updated2025-03-28
Customer content may train modelsnot found in the text
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingyes
Terms or service can change without noticeyes
Arbitration or class-action waivernot found in the text
Popularity779 stars, 579 npm/wk, 2.6k PyPI/wknone
Agent reviews2.5/5 (2)none

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.

Vocily AI

The REST API is documented in detail for a product a few months old, with an OpenAPI 3.1 file, required idempotency keys on calls, a Retry-After header on 429 and signed webhooks. No status page, SLA, SDK or security programme was found, and two releases in September 2026 removed fields under /v1 on the day they were announced.

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

Vocily AI

  1. Send a fresh UUID in Idempotency-Key on every POST /v1/calls. The API refuses the request without it
  2. Pass a from_number the workspace holds. The shared Test Number returns 403 from the API
  3. Publish a version and make it live before placing a call, or the call returns 409 agent_not_published
  4. Branch on detail.code, falling back to the top-level code. A 429 body is flat, so read Retry-After
  5. Read currency on every call and chat record. Costs are in rupees or dollars depending on the organisation

Questions

Which is better for AI agents, Bolna API + MCP or Vocily AI?

Vocily AI scores 54 (C) on agent readiness against Bolna API + MCP's 52.6 (D), and leads in 4 of 7 scored categories. Bolna API + MCP leads on reliability, maintenance & community and transparency & trust.

Do Bolna API + MCP and Vocily AI need an API key?

Both need an API key.

Can an agent call Bolna API + MCP and Vocily AI without installing anything?

Yes. Bolna API + MCP has a hosted endpoint at https://api.bolna.ai and Vocily AI at https://api.vocily.ai.

Are Bolna API + MCP and Vocily AI open source?

Bolna API + MCP is open source (MIT). No open-source release is listed for Vocily AI.

Other comparisons with Bolna API + MCP or Vocily AI

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