Nexus Mutual

Nexus Mutual is a decentralized insurance protocol built on Ethereum that enables members to share risk through a discretionary mutual structure. Since 2019 it has provided over 10,000 covers protecting more than $6 billion in crypto assets against smart contract hacks, custody failure, slashing events, depeg occurrences, and bespoke protocol risks. The public Cover Router REST API exposes endpoints for querying quote pricing, per-product and per-pool capacity, and the full product catalogue, enabling third-party frontends and integrators to build point-of-sale cover purchase flows on top of the Nexus Mutual protocol.

Nexus Mutual publishes 3 APIs on the APIs.io network: Capacity API, Pricing API, and Quote API. Tagged areas include Decentralized Insurance, DeFi, Ethereum, Smart Contract Cover, and Crypto Insurance.

The Nexus Mutual catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Nexus Mutual’s developer surface includes documentation, engineering blog, and 14 more developer resources.

🌐 Visit website 📡 Source on GitHub

43.5/100 developing ▬ flat Agent 28/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6

AccessFree

3 APIs

Decentralized InsuranceDeFiEthereumSmart Contract CoverCrypto InsuranceProtocol ProtectionStakingClaims

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 43.5/100 · developing

Contract Quality 13.9 / 25

Developer Ergonomics 3.5 / 20

Commercial Clarity 10.0 / 20

Operational Transparency 4.1 / 13

Governance 7.0 / 12

Discoverability 7.6 / 10

Agent readiness — 28/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 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

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/nexus-mutual: 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 3

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

GraphQL 1

GraphQL schemas published by this provider.

Rate Limits 1

Documented rate limits and quota policies.

Rate Limits

0 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

JSON Schema 3

Standalone JSON Schema definitions for this provider's data models.

Examples 5

Example request and response payloads for these APIs.

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

SDKs

SDKs

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

BugBounty

BugBounty

Security

Security

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

StatusPage

StatusPage

Commercial 4

Pricing, plans, and the legal terms of use

Plans

FinOps

PrivacyPolicy

TermsOfService

Company 1

The organization behind the API

Blog

Blog

Other 2

Properties that don't map to a standard resource type

DataAnalytics

DataAnalytics

Application

Application

Source (apis.yml)

name: Nexus Mutual
description: 'Nexus Mutual is a decentralized insurance protocol built on Ethereum that enables members to share risk through
  a discretionary mutual structure. Since 2019 it has provided over 10,000 covers protecting more than $6 billion in crypto
  assets against smart contract hacks, custody failure, slashing events, depeg occurrences, and bespoke protocol risks. The
  public Cover Router REST API exposes endpoints for querying quote pricing, per-product and per-pool capacity, and the full
  product catalogue, enabling third-party frontends and integrators to build point-of-sale cover purchase flows on top of
  the Nexus Mutual protocol.

  '
accessModel:
  pricing: free
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Free
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://nexusmutual.io/favicon.ico
url: https://nexusmutual.io
baseURL: https://api.nexusmutual.io
tags:
- Decentralized Insurance
- DeFi
- Ethereum
- Smart Contract Cover
- Crypto Insurance
- Protocol Protection
- Staking
- Claims
created: '2019-01-01'
modified: '2026-06-14'
specificationVersion: '0.19'
apis:
- aid: nexus-mutual:nexus-mutual-capacity-api
  name: Nexus Mutual Capacity API
  description: The Capacity API from Nexus Mutual — 4 operation(s) for capacity.
  humanURL: https://docs.nexusmutual.io/developers/
  baseURL: https://api.nexusmutual.io/v2
  tags:
  - Capacity
  properties:
  - type: OpenAPI
    url: openapi/nexus-mutual-capacity-api-openapi.yml
  - type: Documentation
    url: https://docs.nexusmutual.io/developers/
  - type: GitHubRepository
    url: https://github.com/NexusMutual/cover-router
  - type: GraphQL
    url: graphql/nexus-mutual-graphql.md
- aid: nexus-mutual:nexus-mutual-pricing-api
  name: Nexus Mutual Pricing API
  description: The Pricing API from Nexus Mutual — 1 operation(s) for pricing.
  humanURL: https://docs.nexusmutual.io/developers/
  baseURL: https://api.nexusmutual.io/v2
  tags:
  - Pricing
  properties:
  - type: OpenAPI
    url: openapi/nexus-mutual-pricing-api-openapi.yml
  - type: Documentation
    url: https://docs.nexusmutual.io/developers/
  - type: GitHubRepository
    url: https://github.com/NexusMutual/cover-router
  - type: GraphQL
    url: graphql/nexus-mutual-graphql.md
- aid: nexus-mutual:nexus-mutual-quote-api
  name: Nexus Mutual Quote API
  description: The Quote API from Nexus Mutual — 1 operation(s) for quote.
  humanURL: https://docs.nexusmutual.io/developers/
  baseURL: https://api.nexusmutual.io/v2
  tags:
  - Quote
  properties:
  - type: OpenAPI
    url: openapi/nexus-mutual-quote-api-openapi.yml
  - type: Documentation
    url: https://docs.nexusmutual.io/developers/
  - type: GitHubRepository
    url: https://github.com/NexusMutual/cover-router
  - type: GraphQL
    url: graphql/nexus-mutual-graphql.md
common:
- type: AgenticAccess
  url: agentic-access/nexus-mutual-agentic-access.yml
- type: DomainSecurity
  url: security/nexus-mutual-domain-security.yml
- type: Plans
  url: https://nexusmutual.io/plans/
- type: RateLimits
  url: https://nexusmutual.io/rate-limits/
- type: FinOps
  url: https://nexusmutual.io/finops/
- type: GitHubOrganization
  url: https://github.com/NexusMutual
- type: PrivacyPolicy
  url: https://v2.nexusmutual.io/assets/Privacy-Policy.pdf
- type: TermsOfService
  url: https://v2.nexusmutual.io/assets/Terms-of-Use.pdf
- type: StatusPage
  url: https://dune.com/nexus_mutual
- type: Documentation
  url: https://docs.nexusmutual.io/
- type: SDKs
  url: https://sdk.nexusmutual.io/
- type: BugBounty
  url: https://immunefi.com/bounty/nexusmutual/
- type: Security
  url: https://docs.nexusmutual.io/resources/audits-and-security/
- type: DataAnalytics
  url: https://dune.com/nexus_mutual
- type: Application
  url: https://app.nexusmutual.io/
- type: Blog
  url: https://nexusmutual.io/blog
maintainers:
- FN: Collective Risk Services CIC
  url: https://nexusmutual.io
  adr: 71-75 Shelton Street, Covent Garden, London, United Kingdom, WC2H 9JQ