Angle

Angle (Angle Labs, Inc.) is a decentralized, over-collateralized stablecoin protocol that issued the euro-pegged EURA and dollar-pegged USDA stablecoins, along with yield-bearing staked versions of each. Its on-chain modules included the Transmuter basket-and-dynamic-fee minting system, a borrowing module for depositing collateral against stablecoin debt, a native savings system, and cross-chain liquidity infrastructure. The protocol is open source under the AngleProtocol GitHub organization and ships a TypeScript SDK for building applications on top of it. Angle has announced the end of its operations — the protocol remains fully collateralized and every USDA and EURA is redeemable 1:1 until 1 March 2027 — and the team's ongoing work has moved to Merkl. Angle exposes smart contracts and a client SDK rather than a documented public REST API.

Angle publishes 20 APIs on the APIs.io network, including Allowances API, Angle Protocol Data API, App API, and 17 more. Tagged areas include Company, Stablecoins, Decentralized Finance, Blockchain, and Cryptocurrency.

Angle’s developer surface includes authentication, documentation, and 19 more developer resources.

🌐 Visit website 📡 Source on GitHub

33.1/100 thin ▬ flat Agent 39/100 agent aware Full breakdown ↓
scored 2026-07-27 · rubric v0.5

AccessSelf serve

20 APIs

CompanyStablecoinsDecentralized FinanceBlockchainCryptocurrencySmart ContractsEthereumSDK

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 33.1/100 · thin

Contract Quality 10.6 / 25

Developer Ergonomics 6.5 / 20

Commercial Clarity 4.2 / 20

Operational Transparency 1.7 / 13

Governance 0.0 / 12

Discoverability 10.0 / 10

Agent readiness — 39/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 15

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 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/angle: 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 20

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

Documentation 2

Reference material describing how the API behaves

OpenAPI

OpenAPI

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Lifecycle

Conventions

ErrorCatalog

DataModel

Conformance

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

SourceCode

Packages

SDKs

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Deprecation

Deprecation

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Overlay

Overlay

Overlay

Overlay

Source (apis.yml)

aid: angle
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
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/angle.png
name: Angle
description: Angle (Angle Labs, Inc.) is a decentralized, over-collateralized stablecoin protocol that issued the euro-pegged
  EURA and dollar-pegged USDA stablecoins, along with yield-bearing staked versions of each. Its on-chain modules included
  the Transmuter basket-and-dynamic-fee minting system, a borrowing module for depositing collateral against stablecoin debt,
  a native savings system, and cross-chain liquidity infrastructure. The protocol is open source under the AngleProtocol GitHub
  organization and ships a TypeScript SDK for building applications on top of it. Angle has announced the end of its operations
  — the protocol remains fully collateralized and every USDA and EURA is redeemable 1:1 until 1 March 2027 — and the team's
  ongoing work has moved to Merkl. Angle exposes smart contracts and a client SDK rather than a documented public REST API.
url: https://raw.githubusercontent.com/api-evangelist/angle/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Stablecoins
- Decentralized Finance
- Blockchain
- Cryptocurrency
- Smart Contracts
- Ethereum
- SDK
apis:
- aid: angle:angle-allowances-api
  name: Angle Allowances API
  description: The Allowances API from Angle — 1 operation(s) for allowances.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - Allowances
  properties:
  - type: OpenAPI
    url: openapi/angle-allowances-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
- aid: angle:angle-angle-protocol-data-api
  name: Angle Angle Protocol Data API
  description: The Angle Protocol Data API from Angle — 3 operation(s) for angle protocol data.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - Angle Protocol Data
  properties:
  - type: OpenAPI
    url: openapi/angle-angle-protocol-data-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
- aid: angle:angle-app-api
  name: Angle App API
  description: The App API from Angle — 1 operation(s) for app.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - App
  properties:
  - type: OpenAPI
    url: openapi/angle-app-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
- aid: angle:angle-apr-api
  name: Angle Apr API
  description: The Apr API from Angle — 1 operation(s) for apr.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - Apr
  properties:
  - type: OpenAPI
    url: openapi/angle-apr-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
- aid: angle:angle-balances-api
  name: Angle Balances API
  description: The Balances API from Angle — 1 operation(s) for balances.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - Balances
  properties:
  - type: OpenAPI
    url: openapi/angle-balances-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
- aid: angle:angle-borrow-api
  name: Angle Borrow API
  description: The Borrow API from Angle — 4 operation(s) for borrow.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - Borrow
  properties:
  - type: OpenAPI
    url: openapi/angle-borrow-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
- aid: angle:angle-bridge-api
  name: Angle Bridge API
  description: The Bridge API from Angle — 1 operation(s) for bridge.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - Bridge
  properties:
  - type: OpenAPI
    url: openapi/angle-bridge-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
- aid: angle:angle-dao-api
  name: Angle Dao API
  description: The Dao API from Angle — 1 operation(s) for dao.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - Dao
  properties:
  - type: OpenAPI
    url: openapi/angle-dao-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
- aid: angle:angle-helpers-api
  name: Angle Helpers API
  description: The Helpers API from Angle — 5 operation(s) for helpers.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - Helpers
  properties:
  - type: OpenAPI
    url: openapi/angle-helpers-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
- aid: angle:angle-incentives-api
  name: Angle Incentives API
  description: The Incentives API from Angle — 1 operation(s) for incentives.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - Incentives
  properties:
  - type: OpenAPI
    url: openapi/angle-incentives-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
- aid: angle:angle-integrators-api
  name: Angle Integrators API
  description: The Integrators API from Angle — 6 operation(s) for integrators.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - Integrators
  properties:
  - type: OpenAPI
    url: openapi/angle-integrators-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
- aid: angle:angle-perpetuals-api
  name: Angle Perpetuals API
  description: The Perpetuals API from Angle — 1 operation(s) for perpetuals.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - Perpetuals
  properties:
  - type: OpenAPI
    url: openapi/angle-perpetuals-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
- aid: angle:angle-pools-api
  name: Angle Pools API
  description: The Pools API from Angle — 1 operation(s) for pools.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - Pools
  properties:
  - type: OpenAPI
    url: openapi/angle-pools-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
- aid: angle:angle-prices-api
  name: Angle Prices API
  description: The Prices API from Angle — 1 operation(s) for prices.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - Prices
  properties:
  - type: OpenAPI
    url: openapi/angle-prices-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
- aid: angle:angle-savings-api
  name: Angle Savings API
  description: The Savings API from Angle — 3 operation(s) for savings.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - Savings
  properties:
  - type: OpenAPI
    url: openapi/angle-savings-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
- aid: angle:angle-tvl-api
  name: Angle Tvl API
  description: The Tvl API from Angle — 1 operation(s) for tvl.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - Tvl
  properties:
  - type: OpenAPI
    url: openapi/angle-tvl-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
- aid: angle:angle-user-related-information-api
  name: Angle User related information API
  description: The User related information API from Angle — 3 operation(s) for user related information.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - User related information
  properties:
  - type: OpenAPI
    url: openapi/angle-user-related-information-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
- aid: angle:angle-vaultmanagers-api
  name: Angle VaultManagers API
  description: The VaultManagers API from Angle — 1 operation(s) for vaultmanagers.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - VaultManagers
  properties:
  - type: OpenAPI
    url: openapi/angle-vaultmanagers-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
- aid: angle:angle-vaults-api
  name: Angle Vaults API
  description: The Vaults API from Angle — 1 operation(s) for vaults.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - Vaults
  properties:
  - type: OpenAPI
    url: openapi/angle-vaults-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
- aid: angle:angle-volume-api
  name: Angle Volume API
  description: The Volume API from Angle — 1 operation(s) for volume.
  humanURL: https://angle.money
  baseURL: https://api.angle.money
  tags:
  - Volume
  properties:
  - type: OpenAPI
    url: openapi/angle-volume-api-openapi.yml
  - type: Authentication
    url: authentication/angle-authentication.yml
  - type: Conventions
    url: conventions/angle-conventions.yml
  - type: ErrorCatalog
    url: errors/angle-problem-types.yml
  - type: APIReference
    url: https://api.angle.money/api-docs/
  - type: DataModel
    url: data-model/angle-data-model.yml
common:
- type: Authentication
  url: authentication/angle-authentication.yml
- type: DomainSecurity
  url: security/angle-domain-security.yml
- type: Website
  url: https://angle.money
- type: GitHubOrganization
  url: https://github.com/AngleProtocol
- type: SourceCode
  url: https://github.com/AngleProtocol/angle-core
- type: Packages
  url: packages/angle-packages.yml
- type: SDKs
  url: packages/angle-packages.yml
- type: Lifecycle
  url: lifecycle/angle-lifecycle.yml
- type: Deprecation
  url: lifecycle/angle-lifecycle.yml
- type: Conventions
  url: conventions/angle-conventions.yml
- type: ErrorCatalog
  url: errors/angle-problem-types.yml
- type: DataModel
  url: data-model/angle-data-model.yml
- type: Conformance
  url: conformance/angle-conformance.yml
- type: Overlay
  url: overlays/angle-api-openapi-overlay.yaml
- type: Overlay
  url: overlays/angle-api-openapi-github-overlay.yaml
- type: LLMsTxt
  url: llms/angle-llms.txt
- type: OpenAPI
  url: openapi/angle-api-openapi.json
- type: AgentSkill
  url: skills/_index.yml
- type: Documentation
  url: https://github.com/AngleProtocol/angle-docs
- type: TermsOfService
  url: https://angle.money/terms
- type: PrivacyPolicy
  url: https://angle.money/privacy
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-19'
  status: enriched
  artifacts_added: 22
  pass: local-v1

Angle

Kin Score

APIs 20

Angle Allowances API

Angle Angle Protocol Data API

Angle App API

Angle Apr API

Angle Balances API

Angle Borrow API

Angle Bridge API

Angle Dao API

Angle Helpers API

Angle Incentives API

Angle Integrators API

Angle Perpetuals API

Angle Pools API

Angle Prices API

Angle Savings API

Angle Tvl API

Angle User related information API

Angle VaultManagers API

Angle Vaults API

Angle Volume API

Security Posture 2

Angle Authentication

Angle Domain Security

Resources