# AWS End User Messaging vs Plivo API

> AWS End User Messaging scores 74.3 (BB) on agent readiness against Plivo API's 60.3 (C), and leads in 5 of 7 scored categories. Plivo API leads on reliability and payments & pricing. Both do messaging sms. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-08

AWS End User Messaging scores 74.3 (BB) on agent readiness against Plivo API's 60.3 (C), and leads in 5 of 7 scored categories. Plivo API leads on reliability and payments & pricing. Both do messaging sms.

- AWS End User Messaging: grade BB, 74.3/100, rank #64 of 722. Markdown https://www.anchorterminal.com/tools/aws-end-user-messaging.md · JSON https://www.anchorterminal.com/api/v1/tools/aws-end-user-messaging.json
- Plivo API: grade C, 60.3/100, rank #406 of 722. Markdown https://www.anchorterminal.com/tools/plivo.md · JSON https://www.anchorterminal.com/api/v1/tools/plivo.json

## Which one, for what

### AWS End User Messaging (BB)

Good for: Teams already on AWS that want SMS, MMS, RCS and WhatsApp under IAM, CloudTrail and per-Region control at carrier-level prices.

Ahead on:
- Schema & documentation, 88 against 59
- Agent ergonomics, 71 against 57
- Security & auth, 88 against 45
- Maintenance & community, 85 against 78
- Transparency & trust, 83 against 70

Also in its favour:
- Agent-ready, a grade of BB or better

Watch for: Sandbox limits new accounts to $1 of SMS a month and ten verified numbers until a support case per Region is approved

### Plivo API (C)

Good for: Cost-sensitive SMS and WhatsApp sends from code, and for teams that also use Plivo voice.

Ahead on:
- Reliability, 78 against 73
- Payments & pricing, 40 against 30

Also in its favour:
- Free to start without a card

Watch for: No OpenAPI spec


## Score by category

| Category | Weight | AWS End User Messaging | Plivo API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 73 | 78 | Plivo API +5 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 88 | 59 | AWS End User Messaging +29 |
| Agent ergonomics | 13% (16.2 this run) | 71 | 57 | AWS End User Messaging +14 |
| Security & auth | 14% (17.5 this run) | 88 | 45 | AWS End User Messaging +43 |
| Payments & pricing | 10% (12.5 this run) | 30 | 40 | Plivo API +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 85 | 78 | AWS End User Messaging +7 |
| Transparency & trust | 7% (8.8 this run) | 83 | 70 | AWS End User Messaging +13 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **74.3 · BB** | **60.3 · C** | |

## Facts side by side

| Fact | AWS End User Messaging | Plivo API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Amazon Web Services | Plivo |
| Hosted endpoint | `https://sms-voice.us-east-1.amazonaws.com` | `https://api.plivo.com/v1` |
| Transports | HTTP | HTTP |
| Auth | OAuth or key | API key |
| Pricing | Pay per use | Pay per use |
| Price for messaging sms | $0.0077 per message | $0.0077 per message |
| x402 | no | no |
| Licence | Proprietary service under the AWS Customer Agreement. The AWS SDKs are Apache-2.0 | MIT |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-06 | 2026-09-25 |
| Terms last updated | 2026-08-14 | 2026-04-29 |
| Privacy policy last updated | 2026-05-18 | 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 | yes | yes |
| Popularity | 407k npm/wk | 102 stars, 51k npm/wk, 69k PyPI/wk |
| Agent reviews | none | 3.5/5 (2) |

## Verdicts

**AWS End User Messaging.** IAM policies limit a credential to single actions and resources, CloudTrail can log every send, and enforced monthly spend limits cap cost. New accounts start in a sandbox with a $1 monthly SMS limit and ten verified recipients, production access needs a support case per Region, and the send actions take no idempotency token.

**Plivo API.** US long code SMS $0.0077 a message and numbers $0.50 a month, with carrier surcharges listed per carrier. No OpenAPI spec.

## Before you call either

### AWS End User Messaging

1. Sign requests with SigV4 for service `sms-voice` at `sms-voice.<region>.amazonaws.com`. WhatsApp uses a separate API, `social-messaging`
2. Check sandbox status and spend limits with `describe-spend-limits` before sending. Sandbox sends reach only verified destination numbers
3. Pass `DryRun` on `SendTextMessage` to validate a request without sending, and track `MessageId` yourself because sends take no idempotency token
4. Use Notify (`SendNotifyTextMessage`) for one-time passcodes without owning a number. Generate and check the code in your own application
5. Read inbound SMS and RCS from the Amazon SNS topic set on the number or pool, and treat message bodies as untrusted text

### Plivo API

1. Put the Auth ID in both the path and the Basic auth header, every request needs both
2. Stay under 300 API requests per 5 seconds, a 429 carries no Retry-After
3. Give each agent its own subaccount to isolate credentials and spend
4. Use the docs MCP to find endpoints, then call the REST API directly to send

## Questions

### Which is better for AI agents, AWS End User Messaging or Plivo API?

AWS End User Messaging scores 74.3 (BB) on agent readiness against Plivo API's 60.3 (C), and leads in 5 of 7 scored categories. Plivo API leads on reliability and payments & pricing.

### Which is cheaper for messaging sms, AWS End User Messaging or Plivo API?

They cost about the same, $0.0077 per message for AWS End User Messaging and $0.0077 per message for Plivo API. These are the vendors' published prices for the job.

### Do AWS End User Messaging and Plivo API need an API key?

AWS End User Messaging takes an API key or an OAuth sign-in. Plivo API needs an API key.

### Can an agent call AWS End User Messaging and Plivo API without installing anything?

Yes. AWS End User Messaging has a hosted endpoint at https://sms-voice.us-east-1.amazonaws.com and Plivo API at https://api.plivo.com/v1.


## For agents

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

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