ArcID

ArcID provides an identity and reputation layer for AI agents on the Arc network. Using the ERC‑8004 standard and USDC‑backed settlement, it assigns each agent a permanent on‑chain identity and tracks reputation through settled transactions, enabling verified trust for agents and counterparties. The platform offers APIs for identity lookup, reputation queries, and validation, and integrates with Circle's USDC‑native Layer‑1, delivering sub‑second finality and dollar‑denominated fees. Developers can register agents, browse a directory, and access trust‑screen APIs to gate access and pricing.

ArcID is listed with 1 API on the APIs.io network. Tagged areas include Identity, Artificial Intelligence, Blockchain, Arc, and ERC-8004.

ArcID’s developer surface includes documentation, getting-started guide, signup flow, and 8 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

20.8/100 emerging Agent 3/100 human only Heartbeat 99/100 alive Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

AccessOpen

1 API

Identity Artificial Intelligence Blockchain Arc ERC-8004 USDC

Kin Score

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

Composite quality — 20.8/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 3.6 / 17

Access Clarity 5.8 / 17

Operational Transparency 1.7 / 11

Contract Governance 0.0 / 10

Discoverability 5.6 / 9

Regulatory Posture 3.3 / 15

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 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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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
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
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

12 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 21.4 — up to +15.7 composite points
Access Clarity scores 34.2 — up to +13.2 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/arcusid-com/apis.yml: open an issue on github.com/api-evangelist/arcusid-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 →

APIs 1

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

ArcID Indexer API

The ArcID indexer API provides searchable access to agent registry data.

Pricing Plans 1

Published pricing tiers and plan structures.

Arcusid Com Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Arcusid Com Rate Limits

0 limits

RATE LIMITS

Security Posture 2

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

Arcusid Com Authentication

0 schemes

SECURITY

Arcusid Com Domain Security

TLSv1.3

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Arcusid Com Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Security

Security

DomainSecurity

DomainSecurity

Commercial 2

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

TermsOfService

TermsOfService

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: arcusid-com
name: ArcID
description: ArcID provides an identity and reputation layer for AI agents on the Arc network. Using the ERC‑8004 standard
  and USDC‑backed settlement, it assigns each agent a permanent on‑chain identity and tracks reputation through settled transactions,
  enabling verified trust for agents and counterparties. The platform offers APIs for identity lookup, reputation queries,
  and validation, and integrates with Circle's USDC‑native Layer‑1, delivering sub‑second finality and dollar‑denominated
  fees. Developers can register agents, browse a directory, and access trust‑screen APIs to gate access and pricing.
url: https://artifacts.apis.io/arcusid-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)
accessModel:
  pricing: unknown
  onboarding: open
  trial: false
  try_now: false
  public: true
  gated: none
  gated_source:
  - onboarding
  label: Open access
  confidence: low
  probe_state: unreadable
  source:
  - authentication
  - security
  generated: '2026-11-02'
  method: derived
specificationVersion: '0.20'
created: '2026-11-01'
modified: '2026-11-01'
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: Docs are publicly accessible but no OpenAPI, GraphQL, AsyncAPI, gRPC, or WSDL contract was found.
  evidence:
  - url: https://arcusid.com/docs
    status: 200
  checked: '2026-11-02'
tags:
- Identity
- Artificial Intelligence
- Blockchain
- Arc
- ERC-8004
- USDC
tags_raw:
- Identity
- AI
- Blockchain
- Arc
- ERC-8004
- USDC
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
image: https://arcusid.com/icon.svg?b0d258bd7e0f0d00
common:
- type: Hosts
  url: hosts/arcusid-com-hosts.yml
- type: Vendors
  url: vendors/arcusid-com-vendors.yml
- type: Security
  url: https://arcusid.com/security
- type: DomainSecurity
  url: security/arcusid-com-domain-security.yml
- type: Website
  url: https://arcusid.com/
- type: Documentation
  url: https://arcusid.com/docs
- type: GettingStarted
  url: https://arcusid.com/docs
- type: SignUp
  url: https://arcusid.com/create-agent
- type: PrivacyPolicy
  url: https://arcusid.com/privacy
- type: TermsOfService
  url: https://arcusid.com/terms
- type: GitHubOrganization
  url: https://github.com/arcusid
apis:
- name: ArcID Indexer API
  description: The ArcID indexer API provides searchable access to agent registry data.
  humanURL: https://arcusid.com/docs
  baseURL: https://api.arcusid.com
  aid: arcusid-com:arcid-indexer-api
x-enrichment:
  date: '2026-11-01'
  status: enriched
  artifacts_added: 21
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

ArcID API — frequently asked questions

Does ArcID have an API?

Yes. APIs.io lists 1 API from ArcID, including ArcID Indexer API.

How do I authenticate with the ArcID API?

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

Is the ArcID API ready for AI agents?

ArcID has a Kin Score of 20.8 out of 100 (emerging) and an Agent Readiness score of 2.5 (human-only), scored by API Evangelist on 2026-11-02.

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get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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