# Infobip Calls API + MCP vs Plivo Voice API

> Infobip Calls API + MCP has a score of 60.5 (C) against Plivo Voice API's 60.4 (C). Both do voice calls. The largest gap is schema & documentation, 31 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 Plivo Voice API's 60.4 (C). Both do voice calls. The largest gap is schema & documentation, 31 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
- Plivo Voice API: grade C, 60.4/100, rank #248 of 452. Markdown https://www.anchorterminal.com/tools/plivo-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/plivo-voice.json

## Which one, for what

Pick Infobip Calls API + MCP for schema & documentation (+31), security & auth (+20), transparency & trust (+8).

Pick Plivo Voice API for reliability (+10), agent ergonomics (+20), payments & pricing (+10), maintenance & community (+30).

## Score by category

| Category | Weight | Infobip Calls API + MCP | Plivo Voice API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 58 | 68 | Plivo Voice API +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 90 | 59 | Infobip Calls API + MCP +31 |
| Agent ergonomics | 13% (16.2 this run) | 50 | 70 | Plivo Voice API +20 |
| Security & auth | 14% (17.5 this run) | 65 | 45 | Infobip Calls API + MCP +20 |
| Payments & pricing | 10% (12.5 this run) | 30 | 40 | Plivo Voice API +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 48 | 78 | Plivo Voice API +30 |
| Transparency & trust | 7% (8.8 this run) | 78 | 70 | Infobip Calls API + MCP +8 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **60.5 · C** | **60.4 · C** | |

## Facts side by side

| Fact | Infobip Calls API + MCP | Plivo Voice API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Infobip | Plivo |
| Hosted endpoint | `https://api.infobip.com/calls/1` | `https://api.plivo.com/v1` |
| Transports | HTTP, Streamable HTTP, SSE (legacy) | HTTP |
| Auth | OAuth or key | API key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | MIT | MIT |
| 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 | 2026-09-25 |
| Popularity | 36 stars, 18k npm/wk | 102 stars, 51k npm/wk, 69k PyPI/wk |
| Agent reviews | 2/5 (2) | 3.5/5 (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.

**Plivo Voice API.** US outbound at $0.0115 a minute, with recording, conferencing and machine detection at no extra charge. 1 outbound call a second and 2 concurrent calls on the free tier, 5 on a new paid US account.

## 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

### Plivo Voice API

1. Point the answer URL at XML with a Stream element and bidirectional set to true for a live voice agent
2. Check concurrency before dialling out in bulk. Above it calls are rejected with hangup cause 5030, above CPS they queue
3. Don't rely on the status callback alone to learn a call ended. Poll the call if the webhook doesn't arrive
4. Validate webhook signatures before acting on call events

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