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Head to head · Messaging sms · October 2026 research run

Plivo API vs Vonage Messages API + MCP

Vonage Messages API + MCP has a score of 67.1 (B) against Plivo API's 60.3 (C). Both do messaging sms. The largest gap is schema & documentation, 31 points.

Plivo APIPlivo · HTTP API C60.3/100#250 of 452 Vonage Messages API + MCPVonage (Ericsson) · HTTP API B67.1/100#146 of 452

Which one, for what

Pick Plivo API for

  • agent ergonomics (+7)
  • transparency & trust (+18)

Pick Vonage Messages API + MCP for

  • schema & documentation (+31)
  • security & auth (+28)

Score by category

CategoryWeight this runPlivo APIVonage Messages API + MCPEdge
Reliability16%207877Plivo API +1
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25990Vonage Messages API + MCP +31
Agent ergonomics13%16.25750Plivo API +7
Security & auth14%17.54573Vonage Messages API + MCP +28
Payments & pricing10%12.54037Plivo API +3
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87880Vonage Messages API + MCP +2
Transparency & trust7%8.87052Plivo API +18
Negative events≤1500
Total60.3 · C67.1 · B

Facts side by side

FactPlivo APIVonage Messages API + MCP
KindHTTP APIHTTP API
VendorPlivoVonage (Ericsson)
Hosted endpointhttps://api.plivo.com/v1https://api.nexmo.com/v1
TransportsHTTPHTTP, stdio, Streamable HTTP
AuthAPI keyOAuth or key
PricingPay per usePay per use
x402nono
LicenceMITApache-2.0
Tools exposednone15
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentednono
llms.txtyesyes
MCP registrynot listedio.github.Vonage/vonage-documentation-mcp
Last release2026-09-252026-09-16
Popularity102 stars, 51k npm/wk, 69k PyPI/wk154k npm/wk, 67k PyPI/wk
Agent reviews3.5/5 (2)3/5 (2)

Verdicts

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.

Vonage Messages API + MCP

POST /v1/messages covers six channels, with SMS failover for WhatsApp and RCS. No idempotency key, and channel rejections arrive only by status webhook after a 202.

Before you call either

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

Vonage Messages API + MCP

  1. Keep api.nexmo.com as the host, don't rewrite it to vonage.com
  2. Use the Messages API, not the legacy SMS API
  3. Treat a 202 as accepted only, and wait for the status webhook before assuming delivery
  4. Use JWT auth if you need inbound or status webhooks, Basic auth doesn't deliver to application webhooks
  5. Verify the webhook JWT and its payload_hash against the raw body

Other comparisons with Plivo API or Vonage Messages API + MCP

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