Nansen

Nansen is an onchain analytics platform with wallet labeling, smart-money tracking, token screener, portfolio, prediction markets, and AI Agent endpoints across 30+ chains. The Nansen API exposes REST endpoints under api.nansen.ai with Smart Money, Profiler, Token Screener, Portfolio, Points, Hyperliquid, Agent, and Prediction Markets categories.

Nansen publishes 2 API contracts indexed on the APIs.io network, including Smart Money API, and 1 more. Tagged areas include Web3, Cryptocurrency, Onchain, Wallet Labels, and Smart Money.

The Nansen catalog on APIs.io includes 1 Spectral governance ruleset.

Nansen’s developer surface includes authentication, developer portal, documentation, pricing, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

27.6/100 thin ▬ flat Agent 37/100 agent ready Front door AI 4/6 moderate Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract 2 MCP Servers

Web3 Cryptocurrency OnchainWallet LabelsSmart Money Analytics Multi-Chain Ethereum

Kin Score

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

Composite quality — 27.6/100 · thin

Contract Quality 9.1 / 21

Developer Ergonomics 5.7 / 17

Access Clarity 0.9 / 17

Operational Transparency 1.2 / 11

Contract Governance 1.4 / 10

Discoverability 6.4 / 9

Regulatory Posture 1.6 / 15

Agent readiness — 37/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 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 5 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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 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 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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

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
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
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)
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks

4 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 5.3 — up to +18.9 composite points
Contract Quality scores 42.9 — up to +14.3 composite points
Developer Ergonomics scores 33.3 — up to +13.3 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/nansen/apis.yml: open an issue on github.com/api-evangelist/nansen 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Agent Skills (SKILL.md packages)	standard	58.1	1	1
x402 Micropayments & Agentic Pay-per-Call	standard	58.1	1	1

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 3

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.

Model Context Protocol (MCP)

measured — observed by APIs.io (verified)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

OpenAPI

measured — observed by APIs.io (published)

APIs 2

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

Nansen REST API

REST API surfacing Nansen's on-chain intelligence: smart-money flows, profiler (wallet labels and balances), token screener, portfolio, points, Hyperliquid analytics, prediction...

Nansen Smart Money API

Smart-money wallet flows and behavior.

Open Collections 2

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

Nansen REST Smart Money API

OPEN COLLECTION

Nansen REST API

OPEN COLLECTION

MCP Servers 2

Model Context Protocol servers that expose these APIs to AI agents.

Nansen MCP Server

Remote MCP server at mcp.nansen.ai over HTTP.

MCP SERVER

Nansen MCP Server

Remote MCP server at mcp.nansen.ai over HTTP.

MCP SERVER

Nansen API pricing

Not yet checked against Nansen's own pricing page. Compiled by API Evangelist on 2026-05-08 from www.nansen.ai/pricing; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
API Standard subscription	Free
API Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Standard API per-second: 20 requests per second
Standard API per-minute: 300 requests per minute
Enterprise API: unlimited requests per second

Compiled by API Evangelist, not yet checked against Nansen's documentation. Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

Nansen Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Nansen Rate Limits

3 limits

RATE LIMITS

Service Levels 1

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

Nansen

SLA

FinOps 1

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

Nansen Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Nansen API Rules

43 rules · 41 errors 1 warnings 1 info

SPECTRAL

Security Posture 2

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

Nansen Authentication

apiKey · 1 scheme

SECURITY

Nansen Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Nansen Agentic Access

6 operations

6 operations · 0 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

Portal

Portal

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LlmsText

LlmsText

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Source (apis.yml)

aid: nansen
url: https://raw.githubusercontent.com/api-evangelist/nansen/refs/heads/main/apis.yml
name: Nansen
kind: company
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: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/nansen.png
x-docs-platform: gitbook
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-04
tags:
- Web3
- Cryptocurrency
- Onchain
- Wallet Labels
- Smart Money
- Analytics
- Multi-Chain
- Ethereum
tags_raw:
- Web3
- Crypto
- On-Chain
- Wallet Labels
- Smart Money
- Analytics
- Multi-chain
- Ethereum
created: '2026-05-08'
modified: '2026-05-08'
specificationVersion: '0.23'
description: Nansen is an onchain analytics platform with wallet labeling, smart-money tracking, token screener, portfolio,
  prediction markets, and AI Agent endpoints across 30+ chains. The Nansen API exposes REST endpoints under api.nansen.ai
  with Smart Money, Profiler, Token Screener, Portfolio, Points, Hyperliquid, Agent, and Prediction Markets categories.
apis:
- aid: nansen:rest-api
  name: Nansen REST API
  tags:
  - Onchain
  - Smart Money
  - Wallet Labels
  - Token Screener
  - Portfolio
  - Multi-Chain
  tags_raw:
  - On-Chain
  - Smart Money
  - Wallet Labels
  - Token Screener
  - Portfolio
  - Multi-chain
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  baseURL: https://api.nansen.ai/api/v1
  humanURL: https://docs.nansen.ai/
  description: 'REST API surfacing Nansen''s on-chain intelligence: smart-money flows, profiler (wallet labels and balances),
    token screener, portfolio, points, Hyperliquid analytics, prediction markets, and the Nansen Agent AI endpoint. Authentication
    via apiKey header. Throttled at 20 requests per second and 300 per minute by default.'
  properties:
  - type: Documentation
    url: https://docs.nansen.ai/
  - type: Pricing
    url: https://www.nansen.ai/pricing
  x-features:
  - 30+ chains coverage
  - Smart-money wallet flows
  - 300M+ wallet labels
  - Token screener
  - AI Agent endpoint
  x-use-cases:
  - Trading signal generation
  - Wallet attribution
  - Portfolio compliance and surveillance
- aid: nansen:nansen-smart-money-api
  name: Nansen Smart Money API
  description: Smart-money wallet flows and behavior.
  humanURL: https://docs.nansen.ai/
  baseURL: https://api.nansen.ai/api/v1
  tags:
  - Smart Money
  properties:
  - type: OpenAPI
    url: openapi/nansen-smart-money-api-openapi.yml
common:
- type: Website
  url: https://www.nansen.ai/
- type: AgenticAccess
  url: agentic-access/nansen-agentic-access.yml
- type: DomainSecurity
  url: security/nansen-domain-security.yml
- type: Authentication
  url: authentication/nansen-authentication.yml
- type: GitHubOrganization
  url: https://github.com/nansen-ai
- type: LinkedIn
  url: https://www.linkedin.com/company/nansen
- type: Portal
  url: https://www.nansen.ai/
- type: Documentation
  url: https://docs.nansen.ai/
- type: Pricing
  url: https://www.nansen.ai/pricing
- type: Plans
  url: plans/nansen-plans-pricing.yml
- type: RateLimits
  url: rate-limits/nansen-rate-limits.yml
- type: FinOps
  url: finops/nansen-finops.yml
- type: LlmsText
  url: https://docs.nansen.ai/llms.txt
- type: Blog
  url: https://nansen.ai/blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Nansen API — frequently asked questions

Does Nansen have an API?

Yes. APIs.io lists 2 APIs from Nansen, including Nansen REST API and Nansen Smart Money API.

Is there an OpenAPI specification for the Nansen API?

Yes. APIs.io indexes 1 OpenAPI specification for Nansen, each linked for download from this page.

How do I authenticate with the Nansen API?

Nansen uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Nansen Authentication.

How much does the Nansen API cost?

APIs.io lists 2 pricing plans for Nansen, with each plan's price, limits and inclusions under Pricing on this page.

Does Nansen have an MCP server?

Yes. APIs.io lists 2 MCP servers for Nansen: Remote MCP server at mcp.nansen.ai over HTTP.

Is the Nansen API ready for AI agents?

Nansen has a Kin Score of 27.6 out of 100 (thin) and an Agent Readiness score of 36.5 (agent-ready), scored by API Evangelist on 2026-11-06.

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