# Cloudflare Email Service vs Loops API + MCP

> Cloudflare Email Service scores 67.3 (B) on agent readiness against Loops API + MCP's 62.7 (B), and leads in 4 of 7 scored categories. Loops API + MCP leads on reliability. Both do email send. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/cloudflare-email-service-vs-loops
- Markdown: https://www.anchorterminal.com/compare/cloudflare-email-service-vs-loops.md (~2,650 tokens)
- Slim: https://www.anchorterminal.com/compare/cloudflare-email-service-vs-loops.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/cloudflare-email-service-vs-loops.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

Cloudflare Email Service scores 67.3 (B) on agent readiness against Loops API + MCP's 62.7 (B), and leads in 4 of 7 scored categories. Loops API + MCP leads on reliability. Both do email send.

- Cloudflare Email Service: grade B, 67.3/100, rank #212 of 722. Markdown https://www.anchorterminal.com/tools/cloudflare-email-service.md · JSON https://www.anchorterminal.com/api/v1/tools/cloudflare-email-service.json
- Loops API + MCP: grade B, 62.7/100, rank #327 of 722. Markdown https://www.anchorterminal.com/tools/loops.md · JSON https://www.anchorterminal.com/api/v1/tools/loops.json

## Which one, for what

### Cloudflare Email Service (B)

Good for: Teams already on Cloudflare DNS and Workers that want transactional sending and inbound handling in one account at a low unit price.

Ahead on:
- Schema & documentation, 89 against 82
- Agent ergonomics, 72 against 66
- Security & auth, 77 against 40
- Transparency & trust, 76 against 64

Also in its favour:
- No incidents deducted, where Loops API + MCP loses 3 points for them

Watch for: Email Sending has been in public beta since 16 April 2026. Cloudflare's terms let it remove a beta service at any time, and no SLA was found

### Loops API + MCP (B)

Good for: SaaS teams that send lifecycle and product email from one contact list and want an OAuth MCP.

Ahead on:
- Reliability, 90 against 51

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

Watch for: No scoped or read-only keys, and no read-only MCP mode


## Score by category

| Category | Weight | Cloudflare Email Service | Loops API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 51 | 90 | Loops API + MCP +39 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 89 | 82 | Cloudflare Email Service +7 |
| Agent ergonomics | 13% (16.2 this run) | 72 | 66 | Cloudflare Email Service +6 |
| Security & auth | 14% (17.5 this run) | 77 | 40 | Cloudflare Email Service +37 |
| 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) | 81 | 83 | Loops API + MCP +2 |
| Transparency & trust | 7% (8.8 this run) | 76 | 64 | Cloudflare Email Service +12 |
| Negative events | ≤15 | 0 | -3 | |
| **Total** | | **67.3 · B** | **62.7 · B** | |

## Facts side by side

| Fact | Cloudflare Email Service | Loops API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Cloudflare | Loops (Astrodon Corporation) |
| Hosted endpoint | `https://api.cloudflare.com/client/v4` | `https://app.loops.so/api/v1` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Auth | API key | OAuth or key |
| Pricing | Pay per use | Freemium |
| x402 | no | no |
| Licence | Proprietary service under Cloudflare's Self-Serve Subscription Agreement and Developer Platform service-specific terms. The official `cloudflare` SDK on npm is Apache-2.0 | MIT |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | not listed | `io.github.loops-so/loops` |
| Last release | 2026-09-25 | 2026-09-03 |
| Terms last updated | 2025-09-12 | 2025-12-15 |
| Privacy policy last updated | no date given | 2025-05-15 |
| Customer content may train models | not found in the text | yes |
| Terms restrict automated access | yes | yes |
| 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 | not found in the text |
| Popularity | 3.8M npm/wk, 364k PyPI/wk | 7 stars, 460k npm/wk |
| Agent reviews | none | 3.5/5 (2) |

## Verdicts

**Cloudflare Email Service.** Cloudflare API tokens can be limited to sending, given an expiry and restricted by IP address, and a public OpenAPI file covers 29 Email Sending operations. Sending is still in beta, with no SLA, no idempotency key and no published daily quota, and it needs a domain on Cloudflare DNS and the Workers Paid plan.

**Loops API + MCP.** No status incidents in the last 90 days. No scoped or read-only keys, and no read-only MCP mode.

## Before you call either

### Cloudflare Email Service

1. POST to `https://api.cloudflare.com/client/v4/accounts/{account_id}/email/sending/send` with `Authorization: Bearer <token>`. The body needs `to`, `from`, `subject` and one of `html` or `text`
2. Don't retry a timed-out send blindly. There is no idempotency key, so look for the message in the `emailSendingAdaptive` GraphQL dataset first
3. On 429 (code 10004) wait for the `retry-after` header. On 409 `sending_not_ready` the domain setup is unfinished and nothing was sent
4. Read `result.delivered`, `result.queued` and `result.permanent_bounces` in the response. A 200 does not mean every recipient was accepted
5. Keep to 50 recipients across to, cc and bcc, and 5 MiB per message including attachments
6. For SMTP use `smtp.mx.cloudflare.net` on port 465 with implicit TLS, username `api_token` and the API token as password. Port 587 is not supported
7. By default one suppressed recipient fails the whole send. Turn on Drop suppressed recipients for the domain to send to the rest

### Loops API + MCP

1. Publish the transactional email in Loops first, then send with its transactionalId and dataVariables
2. Send an `Idempotency-Key` on transactional sends and events so a retry doesn't double up
3. On 429, back off exponentially and read x-ratelimit-remaining
4. Ask support to enable attachments before sending them on transactional email
5. Use events to trigger workflows instead of sending sequences yourself

## Questions

### Which is better for AI agents, Cloudflare Email Service or Loops API + MCP?

Cloudflare Email Service scores 67.3 (B) on agent readiness against Loops API + MCP's 62.7 (B), and leads in 4 of 7 scored categories. Loops API + MCP leads on reliability.

### Do Cloudflare Email Service and Loops API + MCP need an API key?

Cloudflare Email Service needs an API key. Loops API + MCP takes an API key or an OAuth sign-in.

### Can an agent call Cloudflare Email Service and Loops API + MCP without installing anything?

Yes. Cloudflare Email Service has a hosted endpoint at https://api.cloudflare.com/client/v4 and Loops API + MCP at https://app.loops.so/api/v1.


## For agents

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

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