Unfragile

The request "domain-layer" names no specific product, and the candidates span several unrelated meanings of a domain layer. Resend 1 and Mailgun 6 send email on a domain, with Mailgun exposing domain health and stats tools. DomainKits 10 searches, monitors and resolves domain names and DNS, and Railway 9 deploys apps onto domains. Which of these is meant is unclear.

A question back: Which kind of domain layer do you mean: sending email from a domain, managing or searching domain names and DNS, or attaching a domain to a deployed app?

1
Resendresend.comverified and signed
An email-sending API for developers, with a domain claim and domain retrieval endpoint for verifying the sending domain 111.
Website Docs Pricing Get started
+12 community tools built for it
for agents: GET /domains/{domain_id}/claim · GET /domains/{domain_id} · GET /domains/{domain_id}
2
Mailgunmailgun.comverified and signed
A transactional email API whose tools read a Mailgun domain's health and DNS verification status and its email statistics 616.
Website Docs Pricing Get started
+2 community tools built for it
for agents: get_domain_stats · get_domain_health · send_email
3
DomainKitsdomainkits.comverified and signed
A domain search and lifecycle tool that searches domains and resolves their DNS records 1020.
Website Docs Pricing Get started
+1 community tools built for it
for agents: usage · market · dns
4
Railwayrailway.comverified and signed
A full-stack cloud whose domain skill adds a domain to a service and reports the URL of a service 919.
Website Docs Pricing
official:MCP server · Railway MCP
for agents: domain · use-railway · railway

Sources

1Resend · Email for developersresend.com · read 2026-10-29
6Transactional Email API Service For Developers - Transactional Email API Service For Developers | Mailgunmailgun.com · read 2026-10-29
9Railway | The all-in-one intelligent cloud providerrailway.com · read 2026-10-29
10DomainKits - Search Across the Full Domain Lifecycledomainkits.com · read 2026-10-29
11Resend: declares "GET /domains/{domain_id}/claim" (the record we read and signed)unfragile.ai · read 2026-10-24
16Mailgun (Activepieces): declares "get_domain_stats" (the record we read and signed)unfragile.ai · read 2026-10-24
19domain: declares "domain" (the record we read and signed)unfragile.ai · read 2026-10-24
20DomainKits MCP - the domain name intelligence: declares "usage" (the record we read and signed)unfragile.ai · read 2026-10-24

For agents: the 10 actions behind this answer

GET /domains/{domain_id}/claim · Resend verified and signed
Retrieve a domain claim
Per-Ticker Earnings Intelligence · Fodda Research Agent verified and signed
The strategic truth layer per company: what analysts pressed on, where management deflected, marketing/retail/tech/sustainability activity, CEO intelligence, and market-validated consumer trends — quarterly records with multi-quarter history for 500+ consumer-sector companies. e.g. What are analysts
scan_domain · ora verified and signed
Scan a website for agent-readiness and return a score, grade, and layer-by-layer breakdown.
m09-domain · m09-domain verified and signed
CRITICAL: Use for domain modeling. Triggers: domain model, DDD, domain-driven design, entity, value object, aggregate, repository pattern, business rules, validation, invariant, 领域模型, 领域驱动设计, 业务规则
· agent-device website read, tools not yet checked
Open-source device layer for coding agents: control mobile, web, TV and desktop apps on devices and simulators, local or in the cloud, via CLI, MCP or Node.js.
get_domain_stats · Mailgun (Activepieces) verified and signed
Get Domain Stats — Retrieve aggregated email statistics for a Mailgun domain (delivered, failed, opened, etc.). Useful for monitoring delivery health and detecting anomalies.
humbleworth/price-predict-v1 · humbleworth/price-predict-v1 verified and signed
Predicts the value of a domain name.
· Xrpdomains website read, tools not yet checked
XRPName. The identity layer for XRPL apps. Names, profiles, wallet kit, APIs.
domain · domain verified and signed
This skill should be used when the user wants to add a domain, generate a railway domain, check current domains, get the URL for a service, or remove a domain.
usage · DomainKits MCP - the domain name intelligence verified and signed
Return the current account tier, per-tool-group usage, rate limits, and stateful Monitor and Strategy quotas.

Labels are the instruments' verdict and are never changed by ranking. Agents and robots get this same answer as JSON at /api/v1/find?q=…&answer=1 and through the MCP server.