Classic

Classic (a.k.a. "OG") is the legacy ShapeShift crypto swap interface at classic.shapeshift.com, now redirecting to og.shapeshift.com. ShapeShift is a self-custody, multichain crypto platform and DEX aggregator. Its Public API (api.shapeshift.com) exposes supported assets and chains (identified with CAIP-19/CAIP-2), indicative swap rates and executable swap quotes, swap-status tracking, and an affiliate/partner program authenticated with Sign-In With Ethereum (EIP-4361, returning a JWT bearer token). Surfaced as a portfolio company of Pantera Capital and enriched into the API Evangelist network.

Classic publishes 5 APIs on the APIs.io network, including Affiliate API, Auth API, Supported Assets API, and 2 more. Tagged areas include Company, Crypto, Cryptocurrency, DEX Aggregator, and Swap.

Classic’s developer surface includes documentation, API reference, engineering blog, support, authentication, and 19 more developer resources.

🌐 Visit website 📡 Source on GitHub

36.3/100 thin ▬ flat Agent 32/100 agent ready saas Full breakdown ↓
scored 2026-09-19 · rubric v0.22.0

1 APIs

Company Crypto Cryptocurrency DEX Aggregator Swap Blockchain Wallets Self-Custody

Kin Score

Kin Score How this is scored →
scored 2026-09-19 · rubric v0.22.0

Composite quality — 36.3/100 · thin

Contract Quality 9.3 / 19

Developer Ergonomics 8.1 / 15

Access Clarity 3.2 / 15

Operational Transparency 0.3 / 10

Contract Governance 0.4 / 9

Discoverability 5.7 / 8

Regulatory Posture 5.9 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 32/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 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

Regulatory Posture applies to this provider. Its tags matched the Payments 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/.

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/classic: 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 5

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

Classic Affiliate API

The Affiliate API from Classic — 5 operation(s) for affiliate.

Classic Auth API

The Auth API from Classic — 2 operation(s) for auth.

Classic Supported Assets API

The Supported Assets API from Classic — 3 operation(s) for supported assets.

Classic Supported Chains API

The Supported Chains API from Classic — 2 operation(s) for supported chains.

Classic Swaps API

The Swaps API from Classic — 3 operation(s) for swaps.

Open Collections 6

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

API Collection

OPEN COLLECTION

ShapeShift Public Affiliate API

OPEN COLLECTION

ShapeShift Public Affiliate Auth API

OPEN COLLECTION

ShapeShift Public Affiliate Supported Assets API

OPEN COLLECTION

ShapeShift Public Affiliate Supported Chains API

OPEN COLLECTION

ShapeShift Public Affiliate Swaps API

OPEN COLLECTION

Security Posture 2

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

Classic Authentication

siwe/http-bearer-jwt · 3 schemes

SECURITY

Classic Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

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

WellKnown

WellKnown

X-MCPServerCandidate

X-MCPServerCandidate

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Conformance

Lifecycle

DataModel

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

SDKs

SDKs

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

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 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: classic
name: Classic
description: Classic (a.k.a. "OG") is the legacy ShapeShift crypto swap interface at classic.shapeshift.com, now redirecting
  to og.shapeshift.com. ShapeShift is a self-custody, multichain crypto platform and DEX aggregator. Its Public API (api.shapeshift.com)
  exposes supported assets and chains (identified with CAIP-19/CAIP-2), indicative swap rates and executable swap quotes,
  swap-status tracking, and an affiliate/partner program authenticated with Sign-In With Ethereum (EIP-4361, returning a JWT
  bearer token). Surfaced as a portfolio company of Pantera Capital and enriched into the API Evangelist network.
url: https://raw.githubusercontent.com/api-evangelist/classic/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- pantera-capital
x-tier: stub
x-tier-reason: portfolio-lead
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
  - security
  generated: '2026-09-03'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
image: https://github.com/shapeshift.png
tags:
- Company
- Crypto
- Cryptocurrency
- DEX Aggregator
- Swap
- Blockchain
- Wallets
- Self-Custody
tags_raw:
- Company
- Crypto
- Cryptocurrency
- DEX Aggregator
- Swaps
- Blockchain
- Wallet
- Self-Custody
apis:
- aid: classic:classic-affiliate-api
  name: Classic Affiliate API
  description: The Affiliate API from Classic — 5 operation(s) for affiliate.
  humanURL: https://api.shapeshift.com/docs
  baseURL: https://api.shapeshift.com
  tags:
  - Affiliates
  tags_raw:
  - Affiliate
  properties:
  - type: OpenAPI
    url: openapi/classic-affiliate-api-openapi.yml
  - type: APIReference
    url: https://api.shapeshift.com/docs
- aid: classic:classic-auth-api
  name: Classic Auth API
  description: The Auth API from Classic — 2 operation(s) for auth.
  humanURL: https://api.shapeshift.com/docs
  baseURL: https://api.shapeshift.com
  tags:
  - Authentication
  tags_raw:
  - Auth
  properties:
  - type: OpenAPI
    url: openapi/classic-auth-api-openapi.yml
  - type: APIReference
    url: https://api.shapeshift.com/docs
- aid: classic:classic-supported-assets-api
  name: Classic Supported Assets API
  description: The Supported Assets API from Classic — 3 operation(s) for supported assets.
  humanURL: https://api.shapeshift.com/docs
  baseURL: https://api.shapeshift.com
  tags:
  - Supported Assets
  properties:
  - type: OpenAPI
    url: openapi/classic-supported-assets-api-openapi.yml
  - type: APIReference
    url: https://api.shapeshift.com/docs
- aid: classic:classic-supported-chains-api
  name: Classic Supported Chains API
  description: The Supported Chains API from Classic — 2 operation(s) for supported chains.
  humanURL: https://api.shapeshift.com/docs
  baseURL: https://api.shapeshift.com
  tags:
  - Supported Chains
  properties:
  - type: OpenAPI
    url: openapi/classic-supported-chains-api-openapi.yml
  - type: APIReference
    url: https://api.shapeshift.com/docs
- aid: classic:classic-swaps-api
  name: Classic Swaps API
  description: The Swaps API from Classic — 3 operation(s) for swaps.
  humanURL: https://api.shapeshift.com/docs
  baseURL: https://api.shapeshift.com
  tags:
  - Swap
  tags_raw:
  - Swaps
  properties:
  - type: OpenAPI
    url: openapi/classic-swaps-api-openapi.yml
  - type: APIReference
    url: https://api.shapeshift.com/docs
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://og.shapeshift.com/
- type: DeveloperPortal
  url: https://api.shapeshift.com/docs
- type: Documentation
  url: https://api.shapeshift.com/docs
- type: APIReference
  url: https://api.shapeshift.com/docs
- type: GitHubOrganization
  url: https://github.com/shapeshift
- type: Blog
  url: https://shapeshift.com/blog
- type: Support
  url: https://shapeshift.com/support
- type: TermsOfService
  url: https://shapeshift.com/terms-of-service
- type: PrivacyPolicy
  url: https://shapeshift.com/privacy-policy
- type: OpenAPI
  url: openapi/_original/classic-shapeshift-openapi-original.json
- type: Overlay
  url: overlays/classic-shapeshift-overlay.yaml
- type: Authentication
  url: authentication/classic-authentication.yml
- type: Conventions
  url: conventions/classic-conventions.yml
- type: ErrorCatalog
  url: errors/classic-problem-types.yml
- type: Conformance
  url: conformance/classic-conformance.yml
- type: Lifecycle
  url: lifecycle/classic-lifecycle.yml
- type: DataModel
  url: data-model/classic-data-model.yml
- type: DomainSecurity
  url: security/classic-domain-security.yml
- type: Packages
  url: packages/classic-packages.yml
- type: SDKs
  url: packages/classic-packages.yml
- type: WellKnown
  url: well-known/classic-well-known.yml
- type: X-MCPServerCandidate
  url: mcp/classic-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: LLMsTxt
  url: llms/classic-llms.txt
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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