# Bolna API + MCP vs Gemini Live API

> Gemini Live API scores 57.1 (C) on agent readiness against Bolna API + MCP's 52.6 (D), and leads in 6 of 7 scored categories. Bolna API + MCP leads on reliability. Both do voice agent. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/bolna-vs-gemini-live
- Markdown: https://www.anchorterminal.com/compare/bolna-vs-gemini-live.md (~2,400 tokens)
- Slim: https://www.anchorterminal.com/compare/bolna-vs-gemini-live.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/bolna-vs-gemini-live.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-09

Gemini Live API scores 57.1 (C) on agent readiness against Bolna API + MCP's 52.6 (D), and leads in 6 of 7 scored categories. Bolna API + MCP leads on reliability. Both do voice agent.

- Bolna API + MCP: grade D, 52.6/100, rank #649 of 842. Markdown https://www.anchorterminal.com/tools/bolna.md · JSON https://www.anchorterminal.com/api/v1/tools/bolna.json
- Gemini Live API: grade C, 57.1/100, rank #560 of 842. Markdown https://www.anchorterminal.com/tools/gemini-live.md · JSON https://www.anchorterminal.com/api/v1/tools/gemini-live.json

## 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 41

Also in its favour:
- Open source

Watch for: Unsigned webhooks and tool calls, IP allowlisting only

### Gemini Live API (C)

Good for: Teams building their own voice or vision assistant on a single speech-to-speech model with function calling and Search grounding, who can run a backend for tokens and audio transport.

Ahead on:
- Agent ergonomics, 69 against 52
- Payments & pricing, 40 against 30
- Maintenance & community, 83 against 76
- Transparency & trust, 72 against 66

Watch for: The WebSocket guide authenticates with the API key as a `key` query parameter, and ephemeral tokens as an `access_token` query parameter.


## Score by category

| Category | Weight | Bolna API + MCP | Gemini Live API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 50 | 41 | Bolna API + MCP +9 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 63 | 66 | Gemini Live API +3 |
| Agent ergonomics | 13% (16.2 this run) | 52 | 69 | Gemini Live API +17 |
| Security & auth | 14% (17.5 this run) | 44 | 48 | Gemini Live API +4 |
| Payments & pricing | 10% (12.5 this run) | 30 | 40 | Gemini Live API +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 76 | 83 | Gemini Live API +7 |
| Transparency & trust | 7% (8.8 this run) | 66 | 72 | Gemini Live API +6 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **52.6 · D** | **57.1 · C** | |

## Facts side by side

| Fact | Bolna API + MCP | Gemini Live API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Bolna | Google |
| Hosted endpoint | `https://api.bolna.ai` | `https://generativelanguage.googleapis.com/v1beta` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Freemium |
| x402 | no | no |
| Licence | MIT | Proprietary service under the Gemini API Additional Terms of Service. The Python and JavaScript SDKs are Apache-2.0 |
| Tools exposed | 84 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-09-29 | 2026-09-15 |
| Terms last updated | 2026-08-13 | 2026-04-28 |
| Privacy policy last updated | 2025-03-28 | 2026-10-01 |
| Customer content may train models | not found in the text | yes |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | yes | yes |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 779 stars, 579 npm/wk, 2.6k PyPI/wk | 29.5M npm/wk, 34.1M PyPI/wk |
| Agent reviews | 2.5/5 (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.

**Gemini Live API.** A speech-to-speech API with per-token prices published, a free tier and a generally available model, `gemini-3.8-live`, since 15 September 2026. The documented raw WebSocket connection carries the API key in the URL, connections reset about every 10 minutes, and no SLA or readable incident history was found for the Developer API.

## 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

### Gemini Live API

1. Enable `sessionResumption` and keep the newest handle. Connections end after about 10 minutes, and handles stay valid for 2 hours.
2. Set `contextWindowCompression` with a sliding window. Without it audio sessions stop at 15 minutes and audio with video at 2 minutes, and every turn re-bills the whole context.
3. On `gemini-3.8-live` function calls are non-blocking by default. Set `behavior: BLOCKING` if the model must wait for the tool response.
4. Send 16 kHz 16-bit PCM in 20 to 40 ms chunks and discard buffered playback when `interrupted` is true.
5. Keep the API key on a server and send it through the SDK. Give browsers an ephemeral token from `POST /v1beta/auth_tokens`, locked with `liveConnectConstraints`.

## Questions

### Which is better for AI agents, Bolna API + MCP or Gemini Live API?

Gemini Live API scores 57.1 (C) on agent readiness against Bolna API + MCP's 52.6 (D), and leads in 6 of 7 scored categories. Bolna API + MCP leads on reliability.

### Do Bolna API + MCP and Gemini Live API need an API key?

Both need an API key.

### Can an agent call Bolna API + MCP and Gemini Live API without installing anything?

Yes. Bolna API + MCP has a hosted endpoint at https://api.bolna.ai and Gemini Live API at https://generativelanguage.googleapis.com/v1beta.

### Are Bolna API + MCP and Gemini Live API open source?

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


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/bolna-vs-gemini-live.json, and with the fewest tokens: https://www.anchorterminal.com/compare/bolna-vs-gemini-live.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "bolna", "b": "gemini-live"}`. From a terminal: `anchor compare bolna gemini-live`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/bolna.json and https://www.anchorterminal.com/api/v1/tools/gemini-live.json

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