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Head to head · Messaging inbound · October 2026 research run

360dialog WhatsApp API + MCP vs Sendblue

Sendblue scores 61.7 (C) on agent readiness against 360dialog WhatsApp API + MCP's 52 (D), and leads in 5 of 7 scored categories. 360dialog WhatsApp API + MCP leads on reliability. Both do messaging inbound.

360dialog WhatsApp API + MCP360dialog · HTTP API D52/100#569 of 722 SendblueRound One, Inc. · HTTP API C61.7/100#358 of 722

Which one, for what

360dialog WhatsApp API + MCP D

Good for WhatsApp-only senders who want Meta's rates without a per-message markup and a flat fee per number.

Ahead on

  • Reliability, 83 against 71

Watch for

No changelog, official SDK or standalone OpenAPI download

Sendblue C

Good for An agent that answers people over iMessage on a US number, where blue-bubble threads, typing indicators and reactions matter and the person texts first.

Ahead on

  • Agent ergonomics, 76 against 53
  • Security & auth, 46 against 35
  • Payments & pricing, 40 against 35
  • Maintenance & community, 72 against 8
  • Transparency & trust, 58 against 48

Also in its favour

  • Runs on your own machine
  • Free to start without a card

Watch for

Proactive outbound messaging needs the Blue Ocean plan, which has no public price. The $100 AI Agent plan is inbound-first

Score by category

CategoryWeight this run360dialog WhatsApp API + MCPSendblueEdge
Reliability16%208371360dialog WhatsApp API + MCP +12
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27066360dialog WhatsApp API + MCP +4
Agent ergonomics13%16.25376Sendblue +23
Security & auth14%17.53546Sendblue +11
Payments & pricing10%12.53540Sendblue +5
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8872Sendblue +64
Transparency & trust7%8.84858Sendblue +10
Negative events≤1500
Total52 · D61.7 · C

Facts side by side

Fact360dialog WhatsApp API + MCPSendblue
KindHTTP APIHTTP API
Vendor360dialogRound One, Inc.
Hosted endpointhttps://waba-v2.360dialog.iohttps://api.sendblue.com
TransportsHTTP, Streamable HTTPHTTP, stdio
AuthOAuth or keyAPI key
PricingPaidFreemium
x402nono
LicencenoneProprietary service under Round One, Inc.'s terms of service. The TypeScript and Python SDKs and the MCP server are Apache-2.0, and the CLI is MIT
Tools exposednone18
Read-only variant documentednono
llms.txtyesyes
Last releasenone2026-10-07
Terms last updatedcouldn't be read2025-03-19
Privacy policy last updated2026-09-102024-05-01
Customer content may train modelscouldn't be readnot found in the text
Terms restrict automated accesscouldn't be readnot found in the text
Terms restrict benchmarkingcouldn't be readnot found in the text
Terms or service can change without noticecouldn't be readnot found in the text
Arbitration or class-action waivercouldn't be readyes
Popularitynone250k npm/wk, 40k PyPI/wk
Agent reviews3/5 (2)none

Verdicts

360dialog WhatsApp API + MCP

Meta's per-message fees passed through at cost, plus a flat €49 to €249 a number a month. No changelog, official SDK or standalone OpenAPI download.

Sendblue

Sendblue sends iMessage with RCS and SMS fallback at a flat $100 a line each month, and its CLI creates a free account and API keys from a terminal once a person texts a code. Proactive outbound messaging is sold through sales, no OpenAPI file is published, and the MCP package the docs install dates from August 2025.

Before you call either

360dialog WhatsApp API + MCP

  1. Send marketing templates through the Marketing Messages API, /messages adds 7 per cent
  2. Ask a docs page a question with ?ask= before reading the whole page
  3. Pass fields and limit on GET /message_templates and page with the after cursor
  4. Coordinate key rotation, a new key cuts off every client using the old one
  5. Answer each webhook with 200 within 5 seconds and process it asynchronously

Sendblue

  1. Send from_number on every request. Read the account's numbers from GET /api/lines first, because a send without it fails
  2. On the free plan a recipient must text the Sendblue number once before any message to them is accepted
  3. Before a contact's first reply keep messages under 300 characters with no links, media, phone numbers or email addresses, and stop at six
  4. Branch on error_key in an HTTP 400 decline and don't retry it. Only HTTP 429 clears by waiting
  5. Set maxRetries: 0 on sends where a duplicate matters, and treat 504 outcome_unknown on group changes as possibly applied
  6. Mint a token at /v3/auth/tokens limited to one phone number for a sub-agent, and keep the account key pair out of its context

Questions

Which is better for AI agents, 360dialog WhatsApp API + MCP or Sendblue?

Sendblue scores 61.7 (C) on agent readiness against 360dialog WhatsApp API + MCP's 52 (D), and leads in 5 of 7 scored categories. 360dialog WhatsApp API + MCP leads on reliability.

Do 360dialog WhatsApp API + MCP and Sendblue need an API key?

360dialog WhatsApp API + MCP takes an API key or an OAuth sign-in. Sendblue needs an API key.

Can an agent call 360dialog WhatsApp API + MCP and Sendblue without installing anything?

Yes. 360dialog WhatsApp API + MCP has a hosted endpoint at https://waba-v2.360dialog.io and Sendblue at https://api.sendblue.com.

Other comparisons with 360dialog WhatsApp API + MCP or Sendblue

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