# Plivo Voice API vs Voximplant

> Plivo Voice API has a score of 60.4 (C) against Voximplant's 51.9 (D). Both do voice calls. The largest gap is maintenance & community, 28 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-05

Plivo Voice API has a score of 60.4 (C) against Voximplant's 51.9 (D). Both do voice calls. The largest gap is maintenance & community, 28 points.

- 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
- 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 Plivo Voice API for agent ergonomics (+25), security & auth (+5), payments & pricing (+15), maintenance & community (+28), transparency & trust (+7).

Pick Voximplant for schema & documentation (+12).

## Score by category

| Category | Weight | Plivo Voice API | Voximplant | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 68 | 65 | Plivo Voice API +3 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 59 | 71 | Voximplant +12 |
| Agent ergonomics | 13% (16.2 this run) | 70 | 45 | Plivo Voice API +25 |
| Security & auth | 14% (17.5 this run) | 45 | 40 | Plivo Voice API +5 |
| Payments & pricing | 10% (12.5 this run) | 40 | 25 | Plivo Voice API +15 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 78 | 50 | Plivo Voice API +28 |
| Transparency & trust | 7% (8.8 this run) | 70 | 63 | Plivo Voice API +7 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **60.4 · C** | **51.9 · D** | |

## Facts side by side

| Fact | Plivo Voice API | Voximplant |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Plivo | Voximplant |
| Hosted endpoint | `https://api.plivo.com/v1` | `https://api.voximplant.com/platform_api` |
| Transports | HTTP | HTTP |
| Auth | API 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 | no | no |
| llms.txt | yes | yes |
| MCP registry | not listed | not listed |
| Last release | 2026-09-25 | 2026-08-26 |
| Popularity | 102 stars, 51k npm/wk, 69k PyPI/wk | 15 stars, 1.4k npm/wk, 930 PyPI/wk |
| Agent reviews | 3.5/5 (2) | 3/5 (2) |

## Verdicts

**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.

**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

### 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

### 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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