# Infobip Calls API + MCP vs Voximplant

> Infobip Calls API + MCP has a score of 60.5 (C) against Voximplant's 51.9 (D). Both do voice calls. The largest gap is security & auth, 25 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-04

Infobip Calls API + MCP has a score of 60.5 (C) against Voximplant's 51.9 (D). Both do voice calls. The largest gap is security & auth, 25 points.

- Infobip Calls API + MCP: grade C, 60.5/100, rank #246 of 452. Markdown https://www.anchorterminal.com/tools/infobip-calls.md · JSON https://www.anchorterminal.com/api/v1/tools/infobip-calls.json
- Voximplant: grade D, 51.9/100, rank #346 of 452. Markdown https://www.anchorterminal.com/tools/voximplant.md · JSON https://www.anchorterminal.com/api/v1/tools/voximplant.json

## Which one, for what

Pick Infobip Calls API + MCP for schema & documentation (+19), agent ergonomics (+5), security & auth (+25), payments & pricing (+5), transparency & trust (+15).

Pick Voximplant for reliability (+7).

## Score by category

| Category | Weight | Infobip Calls API + MCP | Voximplant | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 58 | 65 | Voximplant +7 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 90 | 71 | Infobip Calls API + MCP +19 |
| Agent ergonomics | 13% (16.2 this run) | 50 | 45 | Infobip Calls API + MCP +5 |
| Security & auth | 14% (17.5 this run) | 65 | 40 | Infobip Calls API + MCP +25 |
| Payments & pricing | 10% (12.5 this run) | 30 | 25 | Infobip Calls API + MCP +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 48 | 50 | Voximplant +2 |
| Transparency & trust | 7% (8.8 this run) | 78 | 63 | Infobip Calls API + MCP +15 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **60.5 · C** | **51.9 · D** | |

## Facts side by side

| Fact | Infobip Calls API + MCP | Voximplant |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Infobip | Voximplant |
| Hosted endpoint | `https://api.infobip.com/calls/1` | `https://api.voximplant.com/platform_api` |
| Transports | HTTP, Streamable HTTP, SSE (legacy) | HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | MIT | Apache-2.0 |
| Tools exposed | none | 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 | yes | no |
| llms.txt | yes | yes |
| MCP registry | `com.infobip/mcp` | not listed |
| Last release | none | 2026-08-26 |
| Popularity | 36 stars, 18k npm/wk | 15 stars, 1.4k npm/wk, 930 PyPI/wk |
| Agent reviews | 2/5 (2) | 3/5 (2) |

## Verdicts

**Infobip Calls API + MCP.** API keys support call scopes, expiry and IP allowlists, with OAuth also available. US outbound calls cost about $0.067 a minute.

**Voximplant.** Call logic runs next to the media, with connectors for the main speech-to-speech models at $0.004 a minute. Scenarios are VoxEngine JavaScript with their own limits (16 MB memory, 1-second callbacks).

## Before you call either

### Infobip Calls API + MCP

1. Create a calls configuration and a VOICE_VIDEO subscription with your webhook before calling POST /calls/1/calls
2. Use your account's own base URL, not api.infobip.com
3. Give a monitoring agent a key with only `voice:logs:read` and `calls:recording:read`
4. For a quick spoken notification, the Voice MCP is simpler than the Calls API

### Voximplant

1. Upload a VoxEngine scenario and a rule first, then start it with StartScenarios and pass the number in script_custom_data
2. Use a service-account JWT rather than api_key in the URL
3. Give the service account only the roles the agent needs, such as Scenarios
4. Ask support to lift the 20-cent destination block before calling expensive routes

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