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 API contracts indexed 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.

🌐 Visit website 📡 Profile data on GitHub

37.9/100 thin ▬ flat Agent 27/100 agent aware Front door AI 1/6 silent Heartbeat 100/100 alive open core · MIT Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFree

1 published contract

Decentralized InsuranceDeFi EthereumSmart Contract CoverCrypto InsuranceProtocol ProtectionStaking Claims

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 37.9/100 · thin

Contract Quality 10.3 / 19

Developer Ergonomics 2.9 / 15

Access Clarity 3.9 / 15

Operational Transparency 4.4 / 10

Contract Governance 0.9 / 9

Discoverability 5.1 / 8

Regulatory Posture 2.5 / 15

Open Source Surface 5.0 / 10

Agent readiness — 27/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 9 / 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 4 / 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 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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/.

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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
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
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)

7 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 19.0 — up to +16.2 composite points
Access Clarity scores 26.3 — up to +14.7 composite points
Contract Quality scores 54.7 — up to +11.3 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/nexus-mutual/apis.yml: open an issue on github.com/api-evangelist/nexus-mutual 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 →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

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 3

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

Cover Router Capacity API

OPEN COLLECTION

Cover Router Capacity Pricing API

OPEN COLLECTION

Cover Router Capacity Quote 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

Nexus Mutual API pricing

Not yet checked against Nexus Mutual's own pricing page. Compiled by API Evangelist; confirm before you rely on a figure.

Plan	Price
Open Protocol Access	—

Plan details, limits and sources →

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

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Nexus Mutual

SLA

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 — jsonschema 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

ContributionGuide

ContributionGuide

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 4

Status, limits, changes, and where to get help

IssueTracker

Releases

RateLimits

StatusPage

Commercial 5

Pricing, plans, and the legal terms of use

License

Plans

FinOps

PrivacyPolicy

TermsOfService

Company 2

The organization behind the API

Website

Website

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.

  '
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: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://nexusmutual.io/favicon.ico
url: https://nexusmutual.io
baseURL: https://api.nexusmutual.io
x-docs-platform: docusaurus
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
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

Nexus Mutual API — frequently asked questions

Does Nexus Mutual have an API?

Yes. APIs.io lists 3 APIs from Nexus Mutual, including Nexus Mutual Capacity API, Nexus Mutual Pricing API and Nexus Mutual Quote API.

Is there an OpenAPI specification for the Nexus Mutual API?

Yes. APIs.io indexes 3 OpenAPI specifications for Nexus Mutual, each linked for download from this page.

How much does the Nexus Mutual API cost?

APIs.io lists 1 pricing plan for Nexus Mutual, with each plan's price, limits and inclusions under Pricing on this page.

Is the Nexus Mutual API ready for AI agents?

Nexus Mutual has a Kin Score of 37.9 out of 100 (thin) and an Agent Readiness score of 26.6 (agent-aware), scored by API Evangelist on 2026-11-06.

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