Issue 2: nothing flipped, and Loops started talking about agents

What changed on the board

No check flipped. All 15 pass and fail exactly what they did on 29 Oct 2026, so every score and rank is the same. Four days is short, and we'd rather say so than dress it up.

What changed below the checks

A company can change a file without changing a result. Two did.

Loops rewrote its homepage description to name agents.

29 Oct 2026: "Loops is email marketing software for SaaS teams to send marketing, lifecycle, and transactional email from one product. Free to start."

2 Nov 2026: "Loops is the email platform for SaaS teams and their agents. Send marketing, product, and transactional email from one contact record. Start for free."

Bird's OpenAPI spec grew from 374 paths to 380.

bird.com/openapi.json

The best file we found since issue 1

Postmark registers three tools for browser agents in one small script: search_postmark_docs, get_postmark_pricing and list_postmark_agent_skills, through navigator.modelContext. Bird does the same with search_docs, get_pricing, find_api_endpoint and get_page_markdown.

Postmark's script · Bird's script

Neither moves a score: our check reads a homepage's raw HTML and inline scripts, not the scripts it loads. A blind re-check found them, and both results now carry a dated note.

The whole board at a glance

● pass · × fail · ? couldn't check · – not counted. Highest score at the top, and the table scrolls sideways on a phone.

Who has what

Each check, rarest on the board first. Each name opens that company's result, with the URL we fetched for every check.

• Tools for browser agents

  AR-ACT-07 · 0 of 15 pass

  None of the 15 passes our check yet.

  Something close, which our check doesn't count: Bird (ex-SparkPost) and Postmark

  Not yet: Amazon SES, Azure Communication Services Email, Brevo, Loops, Mailchimp Transactional, MailerSend, Mailgun, Mailjet, Mailtrap, Plunk, Resend, SendGrid and SMTP2GO

• Install shown for four languages

  EM-01 · 6 of 15 pass

  Pass: MailerSend, Mailgun, Mailjet, Mailtrap, Resend and SendGrid

  Not yet: Amazon SES, Azure Communication Services Email, Bird (ex-SparkPost), Brevo, Loops, Mailchimp Transactional, Plunk, Postmark and SMTP2GO

  Best example, Resend: resend.com/docs/send-with-nodejs.md

• Machine-readable discovery file

  AR-READ-06 · 8 of 15 pass

  Pass: Bird (ex-SparkPost), Loops, MailerSend, Mailgun, Mailjet, Mailtrap, Postmark and Resend

  Not yet: Amazon SES, Azure Communication Services Email, Mailchimp Transactional, Plunk, SendGrid and SMTP2GO

  Couldn't check: Brevo

  Best example, Resend: resend.com/.well-known/oauth-authorization-server

• OpenAPI spec

  AR-ACT-02 · 11 of 15 pass

  Pass: Bird (ex-SparkPost), Brevo, Loops, Mailchimp Transactional, Mailgun, Mailjet, Mailtrap, Plunk, Postmark, Resend and SendGrid

  Not yet: Amazon SES, Azure Communication Services Email, MailerSend and SMTP2GO

  Best example, Resend: raw.githubusercontent.com/resend/resend-openapi/main/resend.json

• npm and PyPI packages

  AR-ACT-06 · 11 of 15 pass

  Pass: Azure Communication Services Email, Bird (ex-SparkPost), Brevo, Mailchimp Transactional, MailerSend, Mailgun, Mailjet, Mailtrap, Postmark, Resend and SendGrid

  Something close, which our check doesn't count: SMTP2GO

  Not yet: Amazon SES, Loops and Plunk

  Best example, Resend: resend.com/docs/send-with-nodejs.md

• Send operation in the spec

  EM-02 · 11 of 15 pass

  Pass: Bird (ex-SparkPost), Brevo, Loops, Mailchimp Transactional, Mailgun, Mailjet, Mailtrap, Plunk, Postmark, Resend and SendGrid

  Not yet: Amazon SES, Azure Communication Services Email, MailerSend and SMTP2GO

  Best example, Mailtrap: raw.githubusercontent.com/mailtrap/mailtrap-openapi/main/specs/email-sending-transactional.openapi.yml

• Auth an agent can follow (proxy)

  AR-ACT-01 · 12 of 15 pass

  Pass: Bird (ex-SparkPost), Brevo, Loops, MailerSend, Mailgun, Mailjet, Mailtrap, Plunk, Postmark, Resend, SendGrid and SMTP2GO

  Not counted: Amazon SES, Azure Communication Services Email and Mailchimp Transactional

  Best example, Mailtrap: docs.mailtrap.io/getting-started/email-api-smtp

• MCP server or CLI

  AR-ACT-10 · 12 of 15 pass

  Pass: Amazon SES, Azure Communication Services Email, Bird (ex-SparkPost), Loops, Mailchimp Transactional, MailerSend, Mailtrap, Plunk, Postmark, Resend, SendGrid and SMTP2GO

  Not counted: Brevo, Mailgun and Mailjet

  Best example, Mailtrap: raw.githubusercontent.com/mailtrap/mailtrap-mcp/main/README.md

• Structured docs page

  AR-READ-04 · 13 of 15 pass

  Pass: Amazon SES, Azure Communication Services Email, Bird (ex-SparkPost), Brevo, Loops, Mailchimp Transactional, MailerSend, Mailtrap, Plunk, Postmark, Resend, SendGrid and SMTP2GO

  Something close, which our check doesn't count: Mailgun and Mailjet

  Best example, Resend: resend.com/docs

• Code samples say their language

  AR-READ-05 · 13 of 15 pass

  Pass: Azure Communication Services Email, Bird (ex-SparkPost), Brevo, Loops, Mailchimp Transactional, Mailgun, Mailjet, Mailtrap, Plunk, Postmark, Resend, SendGrid and SMTP2GO

  Something close, which our check doesn't count: MailerSend

  Not yet: Amazon SES

  Best example, Mailtrap: raw.githubusercontent.com/mailtrap/mailtrap-mcp/main/README.md

• Structured data

  AR-READ-08 · 13 of 15 pass

  Pass: Amazon SES, Bird (ex-SparkPost), Brevo, Loops, Mailchimp Transactional, MailerSend, Mailgun, Mailjet, Mailtrap, Plunk, Postmark, Resend and SMTP2GO

  Not yet: Azure Communication Services Email and SendGrid

  Best example, Resend: resend.com

• Free tier in emails

  EM-03 · 13 of 15 pass

  Pass: Amazon SES, Bird (ex-SparkPost), Brevo, Loops, MailerSend, Mailgun, Mailjet, Mailtrap, Plunk, Postmark, Resend, SendGrid and SMTP2GO

  Not yet: Azure Communication Services Email and Mailchimp Transactional

  Best example, Resend: resend.com/pricing

• llms.txt

  AR-READ-07 · 14 of 15 pass

  Pass: Amazon SES, Bird (ex-SparkPost), Brevo, Loops, Mailchimp Transactional, MailerSend, Mailgun, Mailjet, Mailtrap, Plunk, Postmark, Resend, SendGrid and SMTP2GO

  Not yet: Azure Communication Services Email

  Best example, Mailtrap: mailtrap.io/llms.txt

• MCP server

  AR-ACT-03 · 14 of 15 pass

  Pass: Amazon SES, Azure Communication Services Email, Bird (ex-SparkPost), Brevo, Loops, Mailchimp Transactional, MailerSend, Mailgun, Mailtrap, Plunk, Postmark, Resend, SendGrid and SMTP2GO

  Couldn't check: Mailjet

  Best example, Mailtrap: raw.githubusercontent.com/mailtrap/mailtrap-mcp/main/README.md

• AI agents allowed, homepage reachable

  AR-FIND-01 · 15 of 15 pass

  Pass: Amazon SES, Azure Communication Services Email, Bird (ex-SparkPost), Brevo, Loops, Mailchimp Transactional, MailerSend, Mailgun, Mailjet, Mailtrap, Plunk, Postmark, Resend, SendGrid and SMTP2GO

  Best example, Resend: resend.com

• Docs page

  AR-FIND-02 · 15 of 15 pass

  Pass: Amazon SES, Azure Communication Services Email, Bird (ex-SparkPost), Brevo, Loops, Mailchimp Transactional, MailerSend, Mailgun, Mailjet, Mailtrap, Plunk, Postmark, Resend, SendGrid and SMTP2GO

  Best example, Mailtrap: docs.mailtrap.io/developers

• Sitemap

  AR-FIND-03 · 15 of 15 pass

  Pass: Amazon SES, Azure Communication Services Email, Bird (ex-SparkPost), Brevo, Loops, Mailchimp Transactional, MailerSend, Mailgun, Mailjet, Mailtrap, Plunk, Postmark, Resend, SendGrid and SMTP2GO

  Best example, Resend: resend.com/sitemap.xml

• Readable without JavaScript

  AR-READ-01 · 15 of 15 pass

  Pass: Amazon SES, Azure Communication Services Email, Bird (ex-SparkPost), Brevo, Loops, Mailchimp Transactional, MailerSend, Mailgun, Mailjet, Mailtrap, Plunk, Postmark, Resend, SendGrid and SMTP2GO

  Best example, Mailtrap: mailtrap.io

• Real 404s

  AR-READ-02 · 15 of 15 pass

  Pass: Amazon SES, Azure Communication Services Email, Bird (ex-SparkPost), Brevo, Loops, Mailchimp Transactional, MailerSend, Mailgun, Mailjet, Mailtrap, Plunk, Postmark, Resend, SendGrid and SMTP2GO

  Best example, Resend: resend.com/leaderfile-check-404

• Meta description

  AR-READ-03 · 15 of 15 pass

  Pass: Amazon SES, Azure Communication Services Email, Bird (ex-SparkPost), Brevo, Loops, Mailchimp Transactional, MailerSend, Mailgun, Mailjet, Mailtrap, Plunk, Postmark, Resend, SendGrid and SMTP2GO

  Best example, Mailtrap: mailtrap.io

• Readable pricing

  AR-READ-11 · 15 of 15 pass

  Pass: Amazon SES, Azure Communication Services Email, Bird (ex-SparkPost), Brevo, Loops, Mailchimp Transactional, MailerSend, Mailgun, Mailjet, Mailtrap, Plunk, Postmark, Resend, SendGrid and SMTP2GO

  Best example, Mailtrap: mailtrap.io/pricing

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