eusend-dev

eusend is an EU‑native transactional and marketing email API. It processes, stores, and delivers email entirely within the European Union, offering GDPR‑friendly alternatives to Resend, SendGrid, and Postmark. The service provides robust features like DKIM signing, SPF alignment, detailed delivery events, and a developer‑focused dashboard, all hosted on EU data centres.

eusend-dev publishes 12 API contracts indexed on the APIs.io network, including API keys API, Audiences API, Broadcasts API, and 9 more. Tagged areas include Email, Transactional, Marketing, EU, and GDPR.

The eusend-dev catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

eusend-dev’s developer surface includes getting-started guide, documentation, engineering blog, changelog, pricing, support, API reference, and 23 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

61.3/100 strong Agent 50/100 agent native Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract 1 MCP Servers 1 Agent Skills

Email Transactional Marketing EU GDPR

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 61.3/100 · strong

Contract Quality 13.3 / 21

Developer Ergonomics 8.4 / 17

Access Clarity 12.4 / 17

Operational Transparency 2.6 / 11

Contract Governance 8.1 / 10

Discoverability 5.5 / 9

Regulatory Posture 4.3 / 15

Agent readiness — 50/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 3 / 3

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too

4 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 49.3 — up to +10.1 composite points
Operational Transparency scores 23.7 — up to +9.9 composite points
Contract Quality scores 62.8 — up to +9.3 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/eusend-dev/apis.yml: open an issue on github.com/api-evangelist/eusend-dev to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 12

Individual APIs this provider publishes, each with its own machine-readable definition.

eusend-dev API keys API

Mint and revoke credentials, including send-only and domain-scoped keys.

eusend-dev Audiences API

Named contact lists a broadcast can be sent to.

eusend-dev Broadcasts API

One message sent to a whole audience.

eusend-dev Contact properties API

The custom fields contacts carry, and the fallbacks they render with.

eusend-dev Contacts API

The people in an audience, and their subscription state.

eusend-dev Domains API

eusend-dev Emails API

Send, schedule, inspect and cancel individual messages.

eusend-dev Suppressions API

Addresses this organization will not send to.

eusend-dev System API

Unauthenticated liveness and readiness checks.

eusend-dev Templates API

Stored HTML bodies with variable placeholders.

eusend-dev Topics API

Kinds of email a contact can subscribe to and leave independently, so an unsubscribe can be a preference change.

eusend-dev Webhooks API

HTTP callbacks for delivery, bounce, complaint, open and click events.

Scroll for all 12

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

eusend-dev MCP Server

Remote MCP server at mcp.eusend.dev.

MCP SERVER

Agent Skills 1

Packaged agent skills for driving this provider's APIs from an AI assistant.

send-email

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Eusend Dev Plans Pricing

9 plans

PLANS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Eusend Dev Context

75 classes · 125 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

eusend-dev API Rules

19 rules · 13 errors 3 warnings 3 info

SPECTRAL

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

BatchContactsRequest

1 properties

JSON SCHEMA

Broadcast

23 properties

JSON SCHEMA

Domain

11 properties

JSON SCHEMA

Email

16 properties

JSON SCHEMA

SendEmailRequest

16 properties

JSON SCHEMA

UpdateBroadcastRequest

13 properties

JSON SCHEMA

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Eusend Dev Authentication

0 schemes

SECURITY

Eusend Dev Domain Security

TLSv1.3 · DNSSEC · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Eusend Dev Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Eusend Dev Agentic Access

67 operations · 41 acting · 1 human-in-the-loop

67 operations · 41 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Login

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

MCPServer

WellKnown

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Webhooks

Scroll for all 7

Build 3

SDKs, sample code, and the tooling you integrate with

Packages

Packages

SDKs

SDKs

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Security

Security

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Changelog

Changelog

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

PrivacyPolicy

TermsOfService

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: eusend-dev
name: eusend-dev
description: eusend is an EU‑native transactional and marketing email API. It processes, stores, and delivers email entirely
  within the European Union, offering GDPR‑friendly alternatives to Resend, SendGrid, and Postmark. The service provides robust
  features like DKIM signing, SPF alignment, detailed delivery events, and a developer‑focused dashboard, all hosted on EU
  data centres.
url: https://artifacts.apis.io/eusend-dev/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-30 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-30'
modified: '2026-10-30'
tags:
- Email
- Transactional
- Marketing
- EU
- GDPR
image: https://eusend.dev/opengraph-image.jpg
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/eusend-dev-agentic-access.yml
- type: Plans
  url: plans/eusend-dev-plans-pricing.yml
- type: Spectral
  url: rules/eusend-dev-rules.yml
- type: JSONLD
  url: json-ld/eusend-dev-context.jsonld
- type: Vocabulary
  url: vocabulary/eusend-dev-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/eusend-dev-data-model.yml
- type: ErrorCatalog
  url: errors/eusend-dev-problem-types.yml
- type: Conformance
  url: conformance/eusend-dev-conformance.yml
- type: MCPServer
  url: mcp/eusend-dev-mcp.yml
- type: WellKnown
  url: well-known/eusend-dev-well-known.yml
- type: Hosts
  url: hosts/eusend-dev-hosts.yml
- type: Vendors
  url: vendors/eusend-dev-vendors.yml
- type: Packages
  url: packages/eusend-dev-packages.yml
- type: Webhooks
  url: https://eusend.dev/features/webhooks
- type: Security
  url: https://eusend.dev/legal/security
- type: SDKs
  url: https://www.npmjs.com/package/@eusend_dev/sdk
- type: Login
  url: https://eusend.dev/login
- type: GettingStarted
  url: https://eusend.dev/docs/dashboard/domain-setup
- type: DomainSecurity
  url: security/eusend-dev-domain-security.yml
- type: Website
  url: https://eusend.dev/
- type: Documentation
  url: https://eusend.dev/docs
- type: Blog
  url: https://eusend.dev/blog
- type: Changelog
  url: https://eusend.dev/changelog
- type: Pricing
  url: https://eusend.dev/pricing
- type: Support
  url: https://eusend.dev/support
- type: PrivacyPolicy
  url: https://eusend.dev/legal/privacy
- type: TermsOfService
  url: https://eusend.dev/legal/terms
- type: APIReference
  url: https://eusend.dev/docs
- type: GitHubOrganization
  url: https://github.com/eusend-dev
apis:
- aid: eusend-dev:eusend-dev-api-keys-api
  name: eusend-dev API keys API
  description: Mint and revoke credentials, including send-only and domain-scoped keys.
  humanURL: https://eusend.dev/docs
  baseURL: https://api.eusend.dev
  tags:
  - API keys
  properties:
  - type: OpenAPI
    url: openapi/eusend-dev-api-keys-api-openapi.yml
  - type: JSONSchema
    url: json-schema/eusend-dev-domain-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-send-email-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-broadcast-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-email-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-batch-contacts-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-update-broadcast-request-schema.json
- aid: eusend-dev:eusend-dev-audiences-api
  name: eusend-dev Audiences API
  description: Named contact lists a broadcast can be sent to.
  humanURL: https://eusend.dev/docs
  baseURL: https://api.eusend.dev
  tags:
  - Audiences
  properties:
  - type: OpenAPI
    url: openapi/eusend-dev-audiences-api-openapi.yml
  - type: JSONSchema
    url: json-schema/eusend-dev-domain-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-send-email-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-broadcast-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-email-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-batch-contacts-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-update-broadcast-request-schema.json
- aid: eusend-dev:eusend-dev-broadcasts-api
  name: eusend-dev Broadcasts API
  description: One message sent to a whole audience.
  humanURL: https://eusend.dev/docs
  baseURL: https://api.eusend.dev
  tags:
  - Broadcasts
  properties:
  - type: OpenAPI
    url: openapi/eusend-dev-broadcasts-api-openapi.yml
  - type: JSONSchema
    url: json-schema/eusend-dev-domain-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-send-email-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-broadcast-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-email-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-batch-contacts-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-update-broadcast-request-schema.json
- aid: eusend-dev:eusend-dev-contact-properties-api
  name: eusend-dev Contact properties API
  description: The custom fields contacts carry, and the fallbacks they render with.
  humanURL: https://eusend.dev/docs
  baseURL: https://api.eusend.dev
  tags:
  - Contact properties
  properties:
  - type: OpenAPI
    url: openapi/eusend-dev-contact-properties-api-openapi.yml
  - type: JSONSchema
    url: json-schema/eusend-dev-domain-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-send-email-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-broadcast-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-email-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-batch-contacts-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-update-broadcast-request-schema.json
- aid: eusend-dev:eusend-dev-contacts-api
  name: eusend-dev Contacts API
  description: The people in an audience, and their subscription state.
  humanURL: https://eusend.dev/docs
  baseURL: https://api.eusend.dev
  tags:
  - Contacts
  properties:
  - type: OpenAPI
    url: openapi/eusend-dev-contacts-api-openapi.yml
  - type: JSONSchema
    url: json-schema/eusend-dev-domain-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-send-email-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-broadcast-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-email-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-batch-contacts-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-update-broadcast-request-schema.json
- aid: eusend-dev:eusend-dev-domains-api
  name: eusend-dev Domains API
  description: Register sending domains and verify their DKIM, SPF and DMARC records.
  humanURL: https://eusend.dev/docs
  baseURL: https://api.eusend.dev
  tags:
  - Domains
  properties:
  - type: OpenAPI
    url: openapi/eusend-dev-domains-api-openapi.yml
  - type: JSONSchema
    url: json-schema/eusend-dev-domain-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-send-email-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-broadcast-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-email-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-batch-contacts-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-update-broadcast-request-schema.json
- aid: eusend-dev:eusend-dev-emails-api
  name: eusend-dev Emails API
  description: Send, schedule, inspect and cancel individual messages.
  humanURL: https://eusend.dev/docs
  baseURL: https://api.eusend.dev
  tags:
  - Emails
  properties:
  - type: OpenAPI
    url: openapi/eusend-dev-emails-api-openapi.yml
  - type: JSONSchema
    url: json-schema/eusend-dev-domain-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-send-email-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-broadcast-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-email-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-batch-contacts-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-update-broadcast-request-schema.json
- aid: eusend-dev:eusend-dev-suppressions-api
  name: eusend-dev Suppressions API
  description: Addresses this organization will not send to.
  humanURL: https://eusend.dev/docs
  baseURL: https://api.eusend.dev
  tags:
  - Suppressions
  properties:
  - type: OpenAPI
    url: openapi/eusend-dev-suppressions-api-openapi.yml
  - type: JSONSchema
    url: json-schema/eusend-dev-domain-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-send-email-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-broadcast-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-email-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-batch-contacts-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-update-broadcast-request-schema.json
- aid: eusend-dev:eusend-dev-system-api
  name: eusend-dev System API
  description: Unauthenticated liveness and readiness checks.
  humanURL: https://eusend.dev/docs
  baseURL: https://api.eusend.dev
  tags:
  - System
  properties:
  - type: OpenAPI
    url: openapi/eusend-dev-system-api-openapi.yml
  - type: JSONSchema
    url: json-schema/eusend-dev-domain-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-send-email-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-broadcast-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-email-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-batch-contacts-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-update-broadcast-request-schema.json
- aid: eusend-dev:eusend-dev-templates-api
  name: eusend-dev Templates API
  description: Stored HTML bodies with variable placeholders.
  humanURL: https://eusend.dev/docs
  baseURL: https://api.eusend.dev
  tags:
  - Templates
  properties:
  - type: OpenAPI
    url: openapi/eusend-dev-templates-api-openapi.yml
  - type: JSONSchema
    url: json-schema/eusend-dev-domain-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-send-email-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-broadcast-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-email-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-batch-contacts-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-update-broadcast-request-schema.json
- aid: eusend-dev:eusend-dev-topics-api
  name: eusend-dev Topics API
  description: Kinds of email a contact can subscribe to and leave independently, so an unsubscribe can be a preference change.
  humanURL: https://eusend.dev/docs
  baseURL: https://api.eusend.dev
  tags:
  - Topics
  properties:
  - type: OpenAPI
    url: openapi/eusend-dev-topics-api-openapi.yml
  - type: JSONSchema
    url: json-schema/eusend-dev-domain-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-send-email-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-broadcast-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-email-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-batch-contacts-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-update-broadcast-request-schema.json
- aid: eusend-dev:eusend-dev-webhooks-api
  name: eusend-dev Webhooks API
  description: HTTP callbacks for delivery, bounce, complaint, open and click events.
  humanURL: https://eusend.dev/docs
  baseURL: https://api.eusend.dev
  tags:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/eusend-dev-webhooks-api-openapi.yml
  - type: JSONSchema
    url: json-schema/eusend-dev-domain-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-send-email-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-broadcast-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-email-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-batch-contacts-request-schema.json
  - type: JSONSchema
    url: json-schema/eusend-dev-update-broadcast-request-schema.json
x-enrichment:
  date: '2026-10-30'
  status: enriched
  artifacts_added: 27
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

eusend-dev API — frequently asked questions

Does eusend-dev have an API?

Yes. APIs.io lists 12 APIs from eusend-dev, including eusend-dev API keys API, eusend-dev Audiences API and eusend-dev Broadcasts API, and 9 more.

Is there an OpenAPI specification for the eusend-dev API?

Yes. APIs.io indexes 12 OpenAPI specifications for eusend-dev, each linked for download from this page.

How do I authenticate with the eusend-dev API?

eusend-dev uses bearer-token authentication (0 schemes). The details are profiled on APIs.io as Eusend Dev Authentication.

How much does the eusend-dev API cost?

APIs.io lists 9 pricing plans for eusend-dev, with each plan's price, limits and inclusions under Pricing Plans on this page.

Does eusend-dev have an MCP server?

Yes. APIs.io lists 1 MCP server for eusend-dev: Remote MCP server at mcp.eusend.dev.

Is the eusend-dev API ready for AI agents?

eusend-dev has a Kin Score of 61.3 out of 100 (strong) and an Agent Readiness score of 50.1 (agent-native), scored by API Evangelist on 2026-10-31.

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Every operation they expose

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How their score was established

curl "https://apis.io/api/v1/providers/eusend-dev/evidence"

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