Nexus Mutual website screenshot

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 19 more developer resources.

42.3/100 developing ▬ flat Agent 26/100 agent aware open core · MIT Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0
AccessFree
1 APIs
Decentralized InsuranceDeFiEthereumSmart Contract CoverCrypto InsuranceProtocol ProtectionStakingClaims

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0
Regulatory Posture applies to this provider. Its tags matched the Insurance 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.
Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.
Create-or-Update Ergonomics does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.
The six quality facets above are damped to 75 points between them, because both conditional facets apply and carry 25 points together. 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/nexus-mutual: 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 3

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

Nexus Mutual Capacity API

The Capacity API from Nexus Mutual — 4 operation(s) for capacity.

Nexus Mutual Pricing API

The Pricing API from Nexus Mutual — 1 operation(s) for pricing.

Nexus Mutual Quote API

The Quote API from Nexus Mutual — 1 operation(s) for quote.

Open Collections 4

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

API Collection

OPEN COLLECTION

Cover Router Capacity API

OPEN COLLECTION

GraphQL 1

GraphQL schemas published by this provider.

Nexus Mutual GraphQL (The Graph Subgraph)

Nexus Mutual exposes on-chain protocol data through a community-maintained subgraph

GRAPHQL

Pricing Plans 1

Published pricing tiers and plan structures.

Plans

1 plans

PLANS

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.

Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

context Context

0 classes · 35 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Nexus Mutual API Rules

5 rules · 3 warnings 2 info

SPECTRAL

JSON Schema 3

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

CapacityResult

5 properties

JSON SCHEMA

PricingResult

3 properties

JSON SCHEMA

QuoteResponse

1 properties

JSON SCHEMA

Examples 5

Example request and response payloads for these APIs.

Get Capacity All Products

3 fields

EXAMPLE

Get Pool Capacity

3 fields

EXAMPLE

Get Pricing

3 fields

EXAMPLE

Get Product Capacity

3 fields

EXAMPLE

Get Quote

3 fields

EXAMPLE

Security Posture 1

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

Nexus Mutual Domain Security

TLSv1.3 · DNSSEC · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Nexus Mutual Agentic Access

6 operations

6 operations · 0 acting

AGENTIC

Resources

Documentation 2

Reference material describing how the API behaves

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

Build 2

SDKs, sample code, and the tooling you integrate with

Access & Security 3

Authentication, authorization, and security posture

Operate 4

Status, limits, changes, and where to get help

Commercial 5

Pricing, plans, and the legal terms of use

Company 2

The organization behind the API

Other 2

Properties that don't map to a standard resource type

Source (apis.yml)

apis.yml Raw ↑
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.

  '
deliveryModel:
  model: open-core
  license: MIT
  open_source: true
  commercial: true
  callable_host: true
  label: Open core · an OSS project plus a commercial hosted product
  confidence: high
  source:
  - license
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
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: '0.23'
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:
  - Quotes
  tags_raw:
  - 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: Website
  url: https://www.nexusmutual.io/
- type: IssueTracker
  url: https://github.com/NexusMutual/cover-router/issues
- type: Releases
  url: https://github.com/NexusMutual/cover-router/releases
- type: ContributionGuide
  url: https://github.com/NexusMutual/.github/blob/master/CONTRIBUTING.md
- type: License
  name: MIT
  url: https://github.com/NexusMutual/cover-router/blob/dev/LICENSE
- 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

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