D3

D3 is a crypto-infrastructure company building the internet's domain layer, tokenized. Through its Doma Protocol, D3 brings ICANN domain names on-chain as tokenized name assets and unlocks "DomainFi" — programmable DNS, fractionalized domain tokens, an on-chain marketplace, and agentic commerce. Developers use the Doma API (a GraphQL subgraph plus REST Poll and Orderbook APIs), the doma CLI, and portable Agent Skills to register, tokenize, trade, and manage domains across the Doma mainnet (chain 97477) and testnet (97476). D3 is backed by Paradigm.

D3 publishes 2 APIs on the APIs.io network: Events Poll API API and Orderbook API API. Tagged areas include Company, Crypto Infrastructure, Domains, DNS, and Blockchain.

D3’s developer surface includes documentation, API reference, getting-started guide, authentication, signup flow, support, CLI, and 20 more developer resources.

🌐 Visit website 📡 Source on GitHub

42.2/100 developing ▬ flat Agent 29/100 agent ready saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs

Company Crypto Infrastructure Domains DNS Blockchain Tokenization Web3DomainFiMarketplace Agentic Commerce

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 42.2/100 · developing

Contract Quality 12.4 / 23

Developer Ergonomics 13.7 / 18

Access Clarity 2.4 / 18

Operational Transparency 2.8 / 12

Contract Governance 0.5 / 11

Discoverability 6.8 / 9

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 29/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

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 github.com/api-evangelist/d3: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 2

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

D3 Events Poll API API

The Events Poll API API from D3 — 3 operation(s) for events poll api.

D3 Orderbook API API

The Orderbook API API from D3 — 11 operation(s) for orderbook api.

Open Collections 3

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Doma Protocol Events Poll API API

OPEN COLLECTION

Doma Protocol Events Poll API Orderbook API API

OPEN COLLECTION

Rate Limits 1

Documented rate limits and quota policies.

D3 Rate Limits

1 limits

RATE LIMITS

Security Posture 2

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

D3 Authentication

apiKey · 1 scheme

SECURITY

D3 Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

OpenAPI

OpenAPI

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

X-MCPServerCandidate

X-MCPServerCandidate

AgentSkill

AgentSkill

WellKnown

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions

Idempotency

Lifecycle

ErrorCatalog

Conformance

DataModel

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

CLI

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

Support

Support

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: d3
name: D3
description: D3 is a crypto-infrastructure company building the internet's domain layer, tokenized. Through its Doma Protocol,
  D3 brings ICANN domain names on-chain as tokenized name assets and unlocks "DomainFi" — programmable DNS, fractionalized
  domain tokens, an on-chain marketplace, and agentic commerce. Developers use the Doma API (a GraphQL subgraph plus REST
  Poll and Orderbook APIs), the doma CLI, and portable Agent Skills to register, tokenize, trade, and manage domains across
  the Doma mainnet (chain 97477) and testnet (97476). D3 is backed by Paradigm.
url: https://raw.githubusercontent.com/api-evangelist/d3/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- paradigm
x-tier: profiled
x-tier-reason: enriched-from-doma-developer-surface
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - rate-limits
  - security
  generated: '2026-09-03'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
image: https://d3.com/favicon-v2.svg
tags:
- Company
- Crypto Infrastructure
- Domains
- DNS
- Blockchain
- Tokenization
- Web3
- DomainFi
- Marketplace
- Agentic Commerce
apis:
- aid: d3:d3-events-poll-api-api
  name: D3 Events Poll API API
  description: The Events Poll API API from D3 — 3 operation(s) for events poll api.
  humanURL: https://docs.doma.xyz/api-reference
  baseURL: https://api.doma.xyz
  tags:
  - Events Poll API
  properties:
  - type: OpenAPI
    url: openapi/d3-events-poll-api-api-openapi.yml
  - type: Documentation
    url: https://docs.doma.xyz/api-reference
  - type: Authentication
    url: https://docs.doma.xyz/api-reference/authentication-and-rate-limits
- aid: d3:d3-orderbook-api-api
  name: D3 Orderbook API API
  description: The Orderbook API API from D3 — 11 operation(s) for orderbook api.
  humanURL: https://docs.doma.xyz/api-reference
  baseURL: https://api.doma.xyz
  tags:
  - Orderbook API
  properties:
  - type: OpenAPI
    url: openapi/d3-orderbook-api-api-openapi.yml
  - type: Documentation
    url: https://docs.doma.xyz/api-reference
  - type: Authentication
    url: https://docs.doma.xyz/api-reference/authentication-and-rate-limits
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/d3-domain-security.yml
- type: Website
  url: https://d3.com
- type: DeveloperPortal
  url: https://app.doma.xyz/account/developers
- type: Documentation
  url: https://docs.doma.xyz
- type: APIReference
  url: https://docs.doma.xyz/api-reference
- type: GettingStarted
  url: https://docs.doma.xyz/getting-started
- type: Authentication
  url: authentication/d3-authentication.yml
- type: SignUp
  url: https://app.doma.xyz/account/developers
- type: Support
  url: https://d3inc.atlassian.net/servicedesk/customer/portal/3
- type: GitHubOrganization
  url: https://github.com/d3-inc
- type: TermsOfService
  url: https://d3.com/terms
- type: PrivacyPolicy
  url: https://d3.com/privacy
- type: OpenAPI
  url: openapi/_original/d3-doma-openapi.json
- type: LLMsTxt
  url: llms/d3-llms.txt
- type: Packages
  url: packages/d3-packages.yml
- type: SDKs
  url: packages/d3-packages.yml
- type: CLI
  url: cli/d3-cli.yml
- type: X-MCPServerCandidate
  url: mcp/d3-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: AgentSkill
  url: skills/_index.yml
- type: Conventions
  url: conventions/d3-conventions.yml
- type: Idempotency
  url: conventions/d3-conventions.yml
- type: RateLimits
  url: rate-limits/d3-rate-limits.yml
- type: Lifecycle
  url: lifecycle/d3-lifecycle.yml
- type: ErrorCatalog
  url: errors/d3-problem-types.yml
- type: Conformance
  url: conformance/d3-conformance.yml
- type: DataModel
  url: data-model/d3-data-model.yml
- type: WellKnown
  url: well-known/d3-well-known.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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