Alder

Alder provides a free, web‑based invoice generator that lets users create professional PDF invoices without an account. The service includes a REST API and a Machine‑Control‑Protocol (MCP) for AI agents, enabling programmatic invoice creation, customization of logos, line items, taxes, discounts, and PDF download. Alder’s platform is open, requires no sign‑up, and offers unlimited invoice generation for individuals and businesses.

Alder publishes 4 API contracts indexed on the APIs.io network, including Drafts API, PDF API, Template Drafts API, and 1 more. Tagged areas include Invoices, Finance, PDF, Free, and MCP.

Alder’s developer surface includes documentation, API reference, getting-started guide, support, and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

31.7/100 thin Agent 17/100 agent aware Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

AccessOpen

1 published contract 1 MCP Servers

Invoices Finance PDF Free MCP

Kin Score

Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0

Composite quality — 31.7/100 · thin

Contract Quality 9.4 / 21

Developer Ergonomics 7.3 / 17

Access Clarity 3.6 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 5.5 / 9

Regulatory Posture 3.5 / 15

Agent readiness — 17/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 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 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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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<a href="https://apis.io/providers/alderinvoices-com/"><img src="https://apis.io/badge/alderinvoices-com/card.svg" alt="Alder on APIs.io — Kin Score by API Evangelist"></a>

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

Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
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

10 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 21.1 — up to +15.8 composite points
Contract Quality scores 44.4 — up to +13.9 composite points
Operational Transparency scores 0.0 — up to +13.0 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/alderinvoices-com/apis.yml: open an issue on github.com/api-evangelist/alderinvoices-com 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 →

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OpenAPI

measured — observed by APIs.io (published)

APIs 4

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

Alder Drafts API

The Drafts API from Alder — 1 operation(s) for drafts.

Alder PDF API

The Pdf API from Alder — 1 operation(s) for pdf.

Alder Template Drafts API

The Template Drafts API from Alder — 1 operation(s) for template drafts.

Alder Templates API

The Templates API from Alder — 1 operation(s) for templates.

MCP Servers 1

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

Alder MCP Server

Remote MCP server at alderinvoices.com.

MCP SERVER

Security Posture 2

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

Alderinvoices Com Authentication

0 schemes

SECURITY

Alderinvoices Com Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Alderinvoices Com Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

MCPServer

MCPServer

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

DataModel

DataModel

ErrorCatalog

ErrorCatalog

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: alderinvoices-com
name: Alder
description: Alder provides a free, web‑based invoice generator that lets users create professional PDF invoices without an
  account. The service includes a REST API and a Machine‑Control‑Protocol (MCP) for AI agents, enabling programmatic invoice
  creation, customization of logos, line items, taxes, discounts, and PDF download. Alder’s platform is open, requires no
  sign‑up, and offers unlimited invoice generation for individuals and businesses.
accessModel:
  pricing: unknown
  onboarding: open
  trial: false
  try_now: false
  public: true
  gated: none
  gated_source:
  - onboarding
  label: Open access
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-02'
  method: derived
image: https://alderinvoices.com/alder-logo.svg
url: https://artifacts.apis.io/alderinvoices-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-01 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-01'
modified: '2026-11-01'
tags:
- Invoices
- Finance
- PDF
- Free
- MCP
tags_raw:
- Invoice
- Finance
- PDF
- Free
- API
- MCP
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DataModel
  url: data-model/alderinvoices-com-data-model.yml
- type: ErrorCatalog
  url: errors/alderinvoices-com-problem-types.yml
- type: LLMsTxt
  url: llms/alderinvoices-com-llms.txt
- type: MCPServer
  url: mcp/alderinvoices-com-mcp.yml
- type: Hosts
  url: hosts/alderinvoices-com-hosts.yml
- type: Vendors
  url: vendors/alderinvoices-com-vendors.yml
- type: DomainSecurity
  url: security/alderinvoices-com-domain-security.yml
- type: Website
  url: https://alderinvoices.com/
- type: DeveloperPortal
  url: https://alderinvoices.com/developers
- type: Documentation
  url: https://alderinvoices.com/developers
- type: APIReference
  url: https://alderinvoices.com/openapi.json
- type: GettingStarted
  url: https://alderinvoices.com/developers
- type: Support
  url: https://alderinvoices.com/support
- type: TermsOfService
  url: https://alderinvoices.com/terms
- type: PrivacyPolicy
  url: https://alderinvoices.com/privacy
apis:
- aid: alderinvoices-com:alderinvoices-com-drafts-api
  name: Alder Drafts API
  description: The Drafts API from Alder — 1 operation(s) for drafts.
  humanURL: https://alderinvoices.com/developers
  baseURL: https://alderinvoices.com
  tags:
  - Drafts
  properties:
  - type: OpenAPI
    url: openapi/alderinvoices-com-drafts-api-openapi.yml
  - type: Documentation
    url: https://alderinvoices.com/developers
  - type: APIReference
    url: https://alderinvoices.com/openapi.json
- aid: alderinvoices-com:alderinvoices-com-pdf-api
  name: Alder PDF API
  description: The Pdf API from Alder — 1 operation(s) for pdf.
  humanURL: https://alderinvoices.com/developers
  baseURL: https://alderinvoices.com
  tags:
  - PDF
  tags_raw:
  - Pdf
  properties:
  - type: OpenAPI
    url: openapi/alderinvoices-com-pdf-api-openapi.yml
  - type: Documentation
    url: https://alderinvoices.com/developers
  - type: APIReference
    url: https://alderinvoices.com/openapi.json
- aid: alderinvoices-com:alderinvoices-com-template-drafts-api
  name: Alder Template Drafts API
  description: The Template Drafts API from Alder — 1 operation(s) for template drafts.
  humanURL: https://alderinvoices.com/developers
  baseURL: https://alderinvoices.com
  tags:
  - Template Drafts
  properties:
  - type: OpenAPI
    url: openapi/alderinvoices-com-template-drafts-api-openapi.yml
  - type: Documentation
    url: https://alderinvoices.com/developers
  - type: APIReference
    url: https://alderinvoices.com/openapi.json
- aid: alderinvoices-com:alderinvoices-com-templates-api
  name: Alder Templates API
  description: The Templates API from Alder — 1 operation(s) for templates.
  humanURL: https://alderinvoices.com/developers
  baseURL: https://alderinvoices.com
  tags:
  - Templates
  properties:
  - type: OpenAPI
    url: openapi/alderinvoices-com-templates-api-openapi.yml
  - type: Documentation
    url: https://alderinvoices.com/developers
  - type: APIReference
    url: https://alderinvoices.com/openapi.json
x-enrichment:
  date: '2026-11-01'
  status: enriched
  artifacts_added: 24
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

Alder API — frequently asked questions

Does Alder have an API?

Yes. APIs.io lists 4 APIs from Alder, including Alder Drafts API, Alder PDF API and Alder Template Drafts API, and 1 more.

Is there an OpenAPI specification for the Alder API?

Yes. APIs.io indexes 4 OpenAPI specifications for Alder, each linked for download from this page.

How do I authenticate with the Alder API?

Alder documents its authentication (0 schemes). The details are profiled on APIs.io as Alderinvoices Com Authentication.

Does Alder have an MCP server?

Yes. APIs.io lists 1 MCP server for Alder: Remote MCP server at alderinvoices.com.

Is the Alder API ready for AI agents?

Alder has a Kin Score of 31.7 out of 100 (thin) and an Agent Readiness score of 17.1 (agent-aware), scored by API Evangelist on 2026-11-02.

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