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 API contracts indexed on the APIs.io network: Events Poll API and Order book API. Tagged areas include Company, Crypto Infrastructure, Domains, DNS, and Blockchain.

The D3 catalog on APIs.io includes 1 Spectral governance ruleset.

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

🌐 Visit website 📡 Profile data on GitHub

42.4/100 developing ▬ flat Agent 28/100 agent aware Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract 3 Agent Skills

Company Crypto Infrastructure Domains DNS Blockchain Tokenization Web3DomainFiMarketplace Agentic Commerce

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 42.4/100 · developing

Contract Quality 9.3 / 19

Developer Ergonomics 11.4 / 15

Access Clarity 2.0 / 15

Operational Transparency 2.3 / 10

Contract Governance 1.6 / 9

Discoverability 5.5 / 8

Regulatory Posture 2.5 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 28/100 · agent aware

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

Pagination 0 / 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 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.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
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)

7 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 13.2 — up to +17.4 composite points
Contract Quality scores 49.6 — up to +12.6 composite points
Operational Transparency scores 23.7 — up to +9.9 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/d3/apis.yml: open an issue on github.com/api-evangelist/d3 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Stablecoins and Tokenization (stablecoin issuers, tokenized assets)	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 3

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.

DNS

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

Agent Skills

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

APIs 2

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

D3 Events Poll API

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

D3 Order book API

The Order book API API from D3 — 11 operation(s) for order book api.

Open Collections 2

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

Doma Protocol Events Poll API API

OPEN COLLECTION

Doma Protocol Events Poll API Orderbook API API

OPEN COLLECTION

Agent Skills 3

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

doma-mpp

AGENT SKILL

doma-secondary-sales

AGENT SKILL

doma-trade-tokens

AGENT SKILL

Rate Limits 1

Documented rate limits and quota policies.

D3 Rate Limits

1 limits

RATE LIMITS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

D3 API Rules

50 rules · 47 errors 2 warnings 1 info

SPECTRAL

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: '2026-11-06'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-09-16'
image: https://d3.com/favicon-v2.svg
x-docs-platform: gitbook
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-09-25
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
  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-order-book-api-api
  name: D3 Order book API
  description: The Order book API API from D3 — 11 operation(s) for order book api.
  humanURL: https://docs.doma.xyz/api-reference
  baseURL: https://api.doma.xyz
  tags:
  - Order book API
  properties:
  - type: OpenAPI
    url: openapi/d3-order-book-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

D3 API — frequently asked questions

Does D3 have an API?

Yes. APIs.io lists 2 APIs from D3, including D3 Events Poll API and D3 Order book API.

Is there an OpenAPI specification for the D3 API?

Yes. APIs.io indexes 2 OpenAPI specifications for D3, each linked for download from this page.

How do I authenticate with the D3 API?

D3 uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as D3 Authentication.

Is the D3 API ready for AI agents?

D3 has a Kin Score of 42.4 out of 100 (developing) and an Agent Readiness score of 27.8 (agent-aware), scored by API Evangelist on 2026-11-06.

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