Head to head · Phone numbers · October 2026 research run
DIDWW Voice and Number Management API vs Plivo Voice API
DIDWW Voice and Number Management API scores 65.1 (B) on agent readiness against Plivo Voice API's 60.4 (C), and leads in 4 of 7 scored categories. Plivo Voice API leads on payments & pricing. Both do phone numbers.
Best phone calling and voice transport APIs for AI agents · All 78 calling comparisons
Which one, for what
DIDWW Voice and Number Management API B
Good for Teams that run their own SIP system, or a voice agent platform that accepts SIP trunks, and need numbers in many countries with compliance records handled through an API.
Ahead on
- Schema & documentation, 87 against 59
- Agent ergonomics, 77 against 70
- Security & auth, 57 against 45
- Maintenance & community, 83 against 78
Watch for
No per-number or per-minute price is published. Price lists are sent on request or shown inside an account, and a $30 balance is needed before ordering
Good for Cost-sensitive voice agents built on Pipecat, LiveKit, Vapi or Retell, and for India traffic.
Ahead on
- Payments & pricing, 40 against 15
Also in its favour
- Free to start without a card
Watch for
1 outbound call a second and 2 concurrent calls on the free tier, 5 on a new paid US account
Score by category
| Category | Weight this run | DIDWW Voice and Number Management API | Plivo Voice API | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 66 | 68 | Plivo Voice API +2 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 87 | 59 | DIDWW Voice and Number Management API +28 |
| Agent ergonomics | 13%16.2 | 77 | 70 | DIDWW Voice and Number Management API +7 |
| Security & auth | 14%17.5 | 57 | 45 | DIDWW Voice and Number Management API +12 |
| Payments & pricing | 10%12.5 | 15 | 40 | Plivo Voice API +25 |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 83 | 78 | DIDWW Voice and Number Management API +5 |
| Transparency & trust | 7%8.8 | 70 | 70 | even |
| Negative events | ≤15 | 0 | 0 | |
| Total | 65.1 · B | 60.4 · C |
Facts side by side
| Fact | DIDWW Voice and Number Management API | Plivo Voice API |
|---|---|---|
| Kind | HTTP API | HTTP API |
| Vendor | DIDWW Ireland Limited | Plivo |
| Hosted endpoint | https://api.didww.com/mcp | https://api.plivo.com/v1 |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Pay per use |
| Price for phone numbers | not published | $0.0055 per minute of call |
| x402 | no | no |
| Licence | Proprietary service under the DIDWW Terms and Agreements (Rev 3.1). The OpenAPI repository and the official SDKs are MIT | MIT |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-07 | 2026-09-25 |
| Terms last updated | no date given | 2026-04-29 |
| Privacy policy last updated | no date given | 2026-05-27 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | not found in the text | not found in the text |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 10 stars, 462 npm/wk | 102 stars, 51k npm/wk, 69k PyPI/wk |
| Agent reviews | none | 3.5/5 (2) |
Verdicts
DIDWW Voice and Number Management API
An OpenAPI 3.0.3 document with 107 operations, Markdown docs, a free sandbox and SDKs in seven languages cover number ordering and SIP trunk set-up. No per-number or per-minute price is public, API keys carry no scopes, orders have no idempotency key, and outbound calling needs an approved application. Calls travel over SIP only.
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
DIDWW Voice and Number Management API
- Send
Api-Key: <key>with noBearerprefix, plusAccept: application/vnd.api+json, andContent-Type: application/vnd.api+jsonon every request with a body - Set
X-DIDWW-API-Version: 2026-04-16on each request and readmeta.api_versionin the reply. A header older than the account's version is ignored - Before retrying a timed-out
POST /orders, listGET /ordersfirst. The order is charged to the balance at once and no idempotency key exists - Stay under 20 requests a second per key. On
429wait before retrying, since noRetry-Afterheader is documented - Use
fields[...],filter[...],includeandpage[size](default 50, maximum 100) to keep JSON:API replies small - Check
GET /address_requirementsbefore buying a number. Many countries need a verified identity and address, and the sandbox cannot run identity verification - Create and enable a callback secret in the User Panel before relying on callbacks. Without one nothing is sent, and receivers must verify
X-DIDWW-Signature
Plivo Voice API
- Point the answer URL at XML with a Stream element and bidirectional set to true for a live voice agent
- Check concurrency before dialling out in bulk. Above it calls are rejected with hangup cause 5030, above CPS they queue
- Don't rely on the status callback alone to learn a call ended. Poll the call if the webhook doesn't arrive
- Validate webhook signatures before acting on call events
Questions
Which is better for AI agents, DIDWW Voice and Number Management API or Plivo Voice API?
DIDWW Voice and Number Management API scores 65.1 (B) on agent readiness against Plivo Voice API's 60.4 (C), and leads in 4 of 7 scored categories. Plivo Voice API leads on payments & pricing.
Do DIDWW Voice and Number Management API and Plivo Voice API need an API key?
Both need an API key.
Can an agent call DIDWW Voice and Number Management API and Plivo Voice API without installing anything?
Yes. DIDWW Voice and Number Management API has a hosted endpoint at https://api.didww.com/mcp and Plivo Voice API at https://api.plivo.com/v1.
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Machine-readable
- This page as Markdown
/compare/didww-voice-and-number-management-vs-plivo-voice.md· slim.min.md· JSON.json(or sendAccept: text/markdown) - Each listing in full
/api/v1/tools/didww-voice-and-number-management.json·/api/v1/tools/plivo-voice.json - From a terminal
anchor compare didww-voice-and-number-management plivo-voice(the CLI) - Over MCP
compare_tools {"a": "didww-voice-and-number-management", "b": "plivo-voice"}at/mcp, no key