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 API contracts indexed on the APIs.io network, including Affiliate API, Auth API, Supported Assets API, and 2 more. Tagged areas include Company, Cryptocurrency, DEX Aggregator, Swap, and Blockchain.

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

🌐 Visit website 📡 Profile data on GitHub

34.5/100 thin ▬ flat Agent 34/100 agent ready saas Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract 2 Agent Skills

Company Cryptocurrency DEX Aggregator Swap Blockchain Wallets Self-Custody

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 34.5/100 · thin

Contract Quality 9.5 / 21

Developer Ergonomics 9.2 / 17

Access Clarity 3.6 / 17

Operational Transparency 0.6 / 11

Contract Governance 0.5 / 10

Discoverability 5.6 / 9

Regulatory Posture 3.3 / 15

Agent readiness — 34/100 · 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

Pagination 5 / 5

Distinct Operations 3 / 3

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 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/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/classic/"><img src="https://apis.io/badge/classic/card.svg" alt="Classic on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

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
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
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)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

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 21.1 — up to +15.8 composite points
Contract Quality scores 44.8 — up to +13.8 composite points
Operational Transparency scores 5.3 — up to +12.3 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/classic/apis.yml: open an issue on github.com/api-evangelist/classic 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 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 5

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

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

Agent Skills 2

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

Onboard a ShapeShift affiliate and read stats

AGENT SKILL

Get and track a ShapeShift swap

AGENT SKILL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Classic Shapeshift Overlay

2 actions · update · classic-shapeshift-openapi-original.json

DERIVED

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
x-docs-platform: scalar
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-09-21
tags:
- Company
- 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

Classic API — frequently asked questions

Does Classic have an API?

Yes. APIs.io lists 5 APIs from Classic, including Classic Affiliate API, Classic Auth API and Classic Supported Assets API, and 2 more.

Is there an OpenAPI specification for the Classic API?

Yes. APIs.io indexes 5 OpenAPI specifications for Classic, each linked for download from this page.

How do I authenticate with the Classic API?

Classic uses bearer-token authentication (siwe/http-bearer-jwt · 3 schemes). The details are profiled on APIs.io as Classic Authentication.

Is the Classic API ready for AI agents?

Classic has a Kin Score of 34.5 out of 100 (thin) and an Agent Readiness score of 33.6 (agent-ready), scored by API Evangelist on 2026-10-31.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
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.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/classic"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/classic/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/classic/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.