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
46.2/100 developing ▬ flat Agent 70/100 agent native Full breakdown ↓
scored 2026-07-23 · rubric v0.5
AccessSelf serve
2 APIs 1 MCP Servers
CompanyCrypto InfrastructureDomainsDNSBlockchainTokenizationWeb3DomainFiMarketplaceAgentic Commerce

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-23 · rubric v0.5
Composite quality — 46.2/100 · developing
Contract Quality 13.7 / 25
Developer Ergonomics 15.7 / 20
Commercial Clarity 6.8 / 20
Operational Transparency 0.7 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 70/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 15
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 7 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. 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. Want it done for you? Prioritized profiling — $2,500 →

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.

MCP Servers 1

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

d3-mcp.yml

MCP SERVER

Rate Limits 1

Documented rate limits and quota policies.

D3 Rate Limits

0 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
 MCPServer
MCPServer
 AgentSkill
AgentSkill
 WellKnown
WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 Idempotency
Idempotency
 Lifecycle
Lifecycle
 ErrorCatalog
ErrorCatalog
 Conformance
Conformance
 DataModel
DataModel

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs
 CLI
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)

apis.yml Raw ↑ 
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
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.20'
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/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: MCPServer
  url: mcp/d3-mcp.yml
- 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