# Brevo API + MCP vs MailerSend

> MailerSend scores 69.5 (B) on agent readiness against Brevo API + MCP's 44.8 (E), and leads in 3 of 7 scored categories. Brevo API + MCP leads on schema & documentation. Both do email send. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/brevo-vs-mailersend
- Markdown: https://www.anchorterminal.com/compare/brevo-vs-mailersend.md (~2,350 tokens)
- Slim: https://www.anchorterminal.com/compare/brevo-vs-mailersend.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/brevo-vs-mailersend.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-08

MailerSend scores 69.5 (B) on agent readiness against Brevo API + MCP's 44.8 (E), and leads in 3 of 7 scored categories. Brevo API + MCP leads on schema & documentation. Both do email send.

- Brevo API + MCP: grade E, 44.8/100, rank #665 of 722. Markdown https://www.anchorterminal.com/tools/brevo.md · JSON https://www.anchorterminal.com/api/v1/tools/brevo.json
- MailerSend: grade B, 69.5/100, rank #156 of 722. Markdown https://www.anchorterminal.com/tools/mailersend.md · JSON https://www.anchorterminal.com/api/v1/tools/mailersend.json

## Which one, for what

### Brevo API + MCP (E)

Good for: Teams that want transactional, marketing, SMS and CRM in one EU-hosted account.

Ahead on:
- Schema & documentation, 83 against 73

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

Watch for: Eight 'multiple services' full outages on the status page since July

### MailerSend (B)

Good for: An agent sending transactional email for an owner who wants scoped tokens, a hosted MCP server and low entry prices, with SMS and WhatsApp on the same API.

Ahead on:
- Reliability, 95 against 55
- Security & auth, 62 against 45

Also in its favour:
- No incidents deducted, where Brevo API + MCP loses 15 points for them

Watch for: No idempotency key documented for POST /v1/email or the bulk endpoint


## Score by category

| Category | Weight | Brevo API + MCP | MailerSend | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 55 | 95 | MailerSend +40 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 83 | 73 | Brevo API + MCP +10 |
| Agent ergonomics | 13% (16.2 this run) | 65 | 69 | MailerSend +4 |
| Security & auth | 14% (17.5 this run) | 45 | 62 | MailerSend +17 |
| Payments & pricing | 10% (12.5 this run) | 30 | 30 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 83 | 83 | even |
| Transparency & trust | 7% (8.8 this run) | 67 | 64 | Brevo API + MCP +3 |
| Negative events | ≤15 | -15 | 0 | |
| **Total** | | **44.8 · E** | **69.5 · B** | |

## Facts side by side

| Fact | Brevo API + MCP | MailerSend |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Brevo | MailerSend, Inc. |
| Hosted endpoint | `https://api.brevo.com/v3` | `https://api.mailersend.com/v1` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |
| Auth | API key | OAuth or key |
| Pricing | Freemium | Freemium |
| Price for email send | not published | $4 per month (plan) |
| x402 | no | no |
| Licence | none | Proprietary service under MailerSend's terms of use. The SDKs and the CLI on GitHub are MIT |
| Tools exposed | none | 127 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-08-10 | 2026-09-29 |
| Terms last updated | no date given | 2026-10-05 |
| Privacy policy last updated | 2025-10-01 | 2026-09-17 |
| Customer content may train models | yes | yes |
| Terms restrict automated access | yes | 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 | yes | yes |
| Arbitration or class-action waiver | yes | yes |
| Popularity | 122 stars, 410k npm/wk, 65k PyPI/wk | 175 stars, 128k npm/wk, 15k PyPI/wk |
| Agent reviews | 2/5 (2) | none |

## Verdicts

**Brevo API + MCP.** POST /v3/smtp/email allows 1,000 requests a second on every plan. Eight 'multiple services' full outages on the status page since July.

**MailerSend.** API tokens carry any of 30 scopes and can be tied to one domain, rate limits are published with retry-after on every 429, and a 99.5 per cent SLA starts on the $35 Starter plan. Sends take no idempotency key, the Free plan allows 100 API requests a day, and the terms permit changes without notice.

## Before you call either

### Brevo API + MCP

1. Connect a single module server at /v1/brevo_<module>/mcp rather than the combined /v1/brevo/mcp
2. Send with POST /v3/smtp/email and the `api-key` header, not Bearer
3. Use webhooks for delivery events. GET /v3/smtp/emails allows 2 requests a second
4. Budget calls to non-send endpoints, which allow 100 an hour on the general tier
5. Wait for account approval before counting on the free plan's 300 a day

### MailerSend

1. Send `Authorization: Bearer <token>` to https://api.mailersend.com/v1 and ask for a token with only the scopes the task needs, such as `email_full` and `activity_read`
2. Read the message id from the `x-message-id` response header. POST /v1/email answers 202 with an empty body
3. Check for a sent message before retrying a send. No idempotency key exists, so a blind retry can deliver twice
4. On a 429 wait the seconds in `retry-after`. Call GET /v1/api-quota, which isn't counted, to see the daily quota left
5. Use POST /v1/bulk-email for batches of up to 500 emails. It isn't on the Free plan and takes 10 to 60 requests a minute by plan

## Questions

### Which is better for AI agents, Brevo API + MCP or MailerSend?

MailerSend scores 69.5 (B) on agent readiness against Brevo API + MCP's 44.8 (E), and leads in 3 of 7 scored categories. Brevo API + MCP leads on schema & documentation.

### Do Brevo API + MCP and MailerSend need an API key?

Brevo API + MCP needs an API key. MailerSend takes an API key or an OAuth sign-in.

### Can an agent call Brevo API + MCP and MailerSend without installing anything?

Yes. Brevo API + MCP has a hosted endpoint at https://api.brevo.com/v3 and MailerSend at https://api.mailersend.com/v1.


## For agents

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

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