# SendLayer (slim)

> SendLayer is a transactional email service from SendLayer, LLC, with an SMTP relay, a REST API for sending and email events, webhooks, SDKs in five languages and a hosted MCP server. It is aimed largely at WordPress and small-business sites.

- Full: https://www.anchorterminal.com/tools/sendlayer.md (~6,350 tokens) · this version ~1,480 tokens · JSON https://www.anchorterminal.com/tools/sendlayer.json · canonical https://www.anchorterminal.com/tools/sendlayer
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-11-07 · pricing https://www.anchorterminal.com/tools/sendlayer#pricing · reviews https://www.anchorterminal.com/tools/sendlayer#reviews
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

**D · 47.7/100 · rank #1135 of 1486 · #19 in Email delivery APIs · not agent-ready · confidence medium**


Assessment: A small API with an OpenAPI file, llms.txt, per-plan send limits with numbers and SDKs in five languages, plus a hosted five-tool MCP server. Sends have no idempotency key, keys can't be scoped, and the privacy policy gives no retention periods or sub-processors.

## Facts

- Kind: HTTP API · vendor: SendLayer, LLC · category: Email delivery APIs · legal entity: SendLayer, LLC · provenance 75/100
- Endpoint: `https://mcp.sendlayer.com` (HTTP, Streamable HTTP)
- Auth: API key · pricing: Paid · x402: no · licence: unknown
- Benchmark probes: not run yet, so Performance is pending
- Live, from our pollers (not part of the score): up at 2026-11-07 17:50 UTC · uptime 30 days 100.0% (195 probes) · p50 334 ms · p95 425 ms over 24 hours
- Vendor status page: not read, no machine-readable status found (2026-11-07 04:48 UTC)
- Surface listed: The REST API at console.sendlayer.com/api/v1 (email, events, webhooks), SMTP relay and the hosted MCP server at mcp.sendlayer.com, read from developers.sendlayer.com, sendlayer.com, the status page, npm and PyPI on 6 November 2026. No account was made and no tool was called
- Plans: Starter 1,000 emails a month, 1 domain, 3 days of logs. Business 5,000, 3 domains, 15 days. Growth 10,000, 5 domains, 30 days. Scale 20,000+ by quote
- Log retention: 3, 15 or 30 days of email logs depending on the plan, per the pricing page
- MCP server: Hosted at mcp.sendlayer.com and built on the Node SDK per the setup guide. No public source repository or MCP registry entry was found
- Tracking: Open and click tracking on every plan
- Prices: Starter $5 per month (plan); Business $15 per month (plan); Growth $25 per month (plan)

- Scores: Reliability 48, Performance pending, Schema & documentation 68, Agent ergonomics 62, Security & auth 38, Payments & pricing 20, Task success pending, Maintenance & community 40, Transparency & trust 49 · total over the 7 assessed categories
- Why: Reliability, Graded with the hosted lines. · Schema & documentation, OpenAPI file at developers.sendlayer.com/api-reference/sendlayer.json (version 1.0.1) covering four paths, send, events and webhooks (25). · Agent ergonomics, Small responses and five MCP tools (18 of 25). · Security & auth, Plain revocable API keys per domain, several allowed, sent in a header; no scopes, expiry or rotation feature beyond creating and deleting k… · Payments & pricing, No x402, MPP or L402 (0). · Maintenance & community, The Node and Python SDKs were last released as 1.1.0 on 21 August 2026, 77 days before this check (20). · Transparency & trust, Closed service with terms naming SendLayer, LLC under Florida law (15 of 30).
- Sources: 12, open questions: 5, both in the full twin
- Capabilities: email.send, email.analytics, email.domains
- JSON: https://www.anchorterminal.com/api/v1/tools/sendlayer.json
- Verify (for the vendor): the badge `https://www.anchorterminal.com/badges/sendlayer.svg` or a link to https://www.anchorterminal.com/tools/sendlayer from a page on sendlayer.com or one of its subdomains, then `POST https://www.anchorterminal.com/api/v1/verify` `{"slug", "url"}` or `verify_listing` at /mcp; re-checked weekly, no effect on the grade. Snippets in the full twin.
- Support: support@sendlayer.com; https://sendlayer.com/contact/; https://sendlayer.com/docs/; https://status.sendlayer.com; more in the full twin

## Before you call it

1. Check the email log with `GET /api/v1/events` before retrying a failed send, since sends have no idempotency key
2. Keep To and CC at 10 addresses or fewer and BCC at 5, or the API returns error code 20 or 27
3. Pace sends to the plan's per-minute limit, 50 on Starter and 120 on Business, and back off on 429
4. Pass the API key in a header to mcp.sendlayer.com; the server answers 405 to anything but POST

## Connect

```bash
npm install sendlayer
```

```bash
curl https://console.sendlayer.com/api/v1/email -X POST -H "Authorization: Bearer $SENDLAYER_API_KEY" -H "Content-Type: application/json" -d '{"From":{"name":"You","email":"you@yourdomain.com"},"To":[{"name":"Person","email":"person@example.com"}],"Subject":"Hello","ContentType":"Text","PlainContent":"Hello"}'
```

```bash
claude mcp add --scope user --transport http sendlayer-mcp https://mcp.sendlayer.com --header "Authorization: Bearer YOUR_SENDLAYER_API_KEY"
```
Full config and headless snippets are in the full page. Through letme (picks today, calling later): https://letme.dev/sendlayer

## Similar tools

| Tool | Grade | Score | Shared capabilities | Slim |
| --- | --- | --- | --- | --- |
| Resend API + MCP | A | 78.1 | email.send, email.domains, email.analytics | https://www.anchorterminal.com/tools/resend.min.md |
| AhaSend API + MCP | BB | 75.4 | email.send, email.domains, email.analytics | https://www.anchorterminal.com/tools/ahasend.min.md |
| Amazon SES | BB | 73.6 | email.send, email.domains, email.analytics | https://www.anchorterminal.com/tools/amazon-ses.min.md |
| AgentMail API + MCP | BB | 72.8 | email.send, email.domains, email.analytics | https://www.anchorterminal.com/tools/agentmail.min.md |
| MailerSend | BB | 71.4 | email.send, email.domains, email.analytics | https://www.anchorterminal.com/tools/mailersend.min.md |


## Panel reviews (0, desk reviews from public material, no calls made)