Blockchair

Blockchair is a multi-blockchain explorer and data API providing unified access to on-chain data across 40+ blockchains (Bitcoin, Ethereum, Litecoin, Dogecoin, Ripple, Stellar, Monero, Cardano, and more). The REST API at api.blockchair.com exposes per-chain dashboards (address, transaction, block), raw node data, network stats, a SQL-like database query interface over outputs and other tables, and transaction broadcasting, authenticated with a simple key query parameter.

Blockchair publishes 7 API contracts indexed on the APIs.io network, including Address Dashboards API, Block Dashboards API, Broadcast API, and 4 more. Tagged areas include Blockchain, Cryptocurrency, Explorer, Bitcoin, and Ethereum.

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

Blockchair’s developer surface includes authentication, documentation, and 8 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

26.5/100 thin ▬ flat Agent 22/100 agent aware Heartbeat 0/100 dormant saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumOpen⚡ Free to try

1 published contract

Blockchain Cryptocurrency Explorer Bitcoin Ethereum On-Chain Data

Kin Score

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

Composite quality — 26.5/100 · thin

Contract Quality 8.6 / 19

Developer Ergonomics 3.8 / 15

Access Clarity 1.2 / 15

Operational Transparency 1.0 / 10

Contract Governance 1.2 / 9

Discoverability 5.0 / 8

Regulatory Posture 1.8 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 22/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 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 0 / 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 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) 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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. 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
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
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

9 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 7.9 — up to +18.4 composite points
Developer Ergonomics scores 25.0 — up to +15.0 composite points
Contract Quality scores 45.9 — up to +13.5 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/blockchair/apis.yml: open an issue on github.com/api-evangelist/blockchair 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
Browser Extension Stores (company-published Firefox add-ons; Chrome Web Store unreadable)	builds-on	17.2 (thin)	-	-

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 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 7

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

Blockchair Address Dashboards API

Per-address balance and transaction dashboards.

Blockchair Block Dashboards API

Parsed block dashboards.

Blockchair Broadcast API

Signed transaction broadcasting.

Blockchair Outputs Database API

SQL-like database query interface.

Blockchair Raw Data API

Raw node-level block and transaction data.

Blockchair Stats API

Network and chain statistics.

Blockchair Transaction Dashboards API

Parsed transaction dashboards.

Scroll for all 7

Open Collections 8

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

Blockchair Address Dashboards API

OPEN COLLECTION

Blockchair Address Dashboards Block Dashboards API

OPEN COLLECTION

Blockchair Address Dashboards Broadcast API

OPEN COLLECTION

Blockchair Address Dashboards Outputs Database API

OPEN COLLECTION

Blockchair Address Dashboards Raw Data API

OPEN COLLECTION

Blockchair Address Dashboards Stats API

OPEN COLLECTION

Blockchair Address Dashboards Transaction Dashboards API

OPEN COLLECTION

Blockchair API

OPEN COLLECTION

Scroll for all 8

Blockchair API pricing

Not yet checked against Blockchair's own pricing page. Compiled by API Evangelist on 2026-06-21 from blockchair.com/api; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free free	Free
Enterprise 25,000 calls/day subscription	—
Enterprise 50,000 calls/day subscription	—
Enterprise 75,000 calls/day subscription	—
Enterprise 100,000 calls/day subscription	—
Custom enterprise	—

Plan details, limits and sources →

Rate limits

Daily Requests (no key): 1440 per day requests
Requests Per Minute (no key): 30 per minute requests
Requests Per Second (soft): ~5 per second requests

Compiled by API Evangelist, not yet checked against Blockchair's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Blockchair Plans Pricing

6 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Blockchair Rate Limits

5 limits

RATE LIMITS

Service Levels 1

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

Blockchair

SLA

FinOps 1

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

Blockchair Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Blockchair API Rules

67 rules · 65 errors 1 warnings 1 info

SPECTRAL

Security Posture 2

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

Blockchair Authentication

apiKey · 1 scheme

SECURITY

Blockchair Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

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

Blockchair Agentic Access

16 operations · 1 acting

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 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 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 2

The organization behind the API

LinkedIn

Website

Website

Source (apis.yml)

aid: blockchair
url: https://raw.githubusercontent.com/api-evangelist/blockchair/refs/heads/main/apis.yml
name: Blockchair
kind: company
description: Blockchair is a multi-blockchain explorer and data API providing unified access to on-chain data across 40+ blockchains
  (Bitcoin, Ethereum, Litecoin, Dogecoin, Ripple, Stellar, Monero, Cardano, and more). The REST API at api.blockchair.com
  exposes per-chain dashboards (address, transaction, block), raw node data, network stats, a SQL-like database query interface
  over outputs and other tables, and transaction broadcasting, authenticated with a simple key query parameter.
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: open
  trial: false
  try_now: true
  public: true
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Open access
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/blockchair.png
tags:
- Blockchain
- Cryptocurrency
- Explorer
- Bitcoin
- Ethereum
- On-Chain Data
created: '2026-06-21'
modified: '2026-06-21'
specificationVersion: '0.23'
apis:
- aid: blockchair:blockchair-address-dashboards-api
  name: Blockchair Address Dashboards API
  description: Per-address balance and transaction dashboards.
  humanURL: https://blockchair.com/api/docs
  baseURL: https://api.blockchair.com
  tags:
  - Address Dashboards
  properties:
  - type: OpenAPI
    url: openapi/blockchair-address-dashboards-api-openapi.yml
  - type: Documentation
    url: https://blockchair.com/api/docs
  - type: APIReference
    url: https://github.com/Blockchair/Blockchair.Support/blob/master/API_DOCUMENTATION_EN.md
  - type: PostmanCollection
    url: collections/blockchair.postman_collection.json
  - type: OpenCollection
    url: collections/blockchair.opencollection.json
- aid: blockchair:blockchair-block-dashboards-api
  name: Blockchair Block Dashboards API
  description: Parsed block dashboards.
  humanURL: https://blockchair.com/api/docs
  baseURL: https://api.blockchair.com
  tags:
  - Block Dashboards
  properties:
  - type: OpenAPI
    url: openapi/blockchair-block-dashboards-api-openapi.yml
  - type: Documentation
    url: https://blockchair.com/api/docs
  - type: APIReference
    url: https://github.com/Blockchair/Blockchair.Support/blob/master/API_DOCUMENTATION_EN.md
  - type: PostmanCollection
    url: collections/blockchair.postman_collection.json
  - type: OpenCollection
    url: collections/blockchair.opencollection.json
- aid: blockchair:blockchair-broadcast-api
  name: Blockchair Broadcast API
  description: Signed transaction broadcasting.
  humanURL: https://blockchair.com/api/docs
  baseURL: https://api.blockchair.com
  tags:
  - Broadcast
  properties:
  - type: OpenAPI
    url: openapi/blockchair-broadcast-api-openapi.yml
  - type: Documentation
    url: https://blockchair.com/api/docs
  - type: APIReference
    url: https://github.com/Blockchair/Blockchair.Support/blob/master/API_DOCUMENTATION_EN.md
  - type: PostmanCollection
    url: collections/blockchair.postman_collection.json
  - type: OpenCollection
    url: collections/blockchair.opencollection.json
- aid: blockchair:blockchair-outputs-database-api
  name: Blockchair Outputs Database API
  description: SQL-like database query interface.
  humanURL: https://blockchair.com/api/docs
  baseURL: https://api.blockchair.com
  tags:
  - Outputs Database
  properties:
  - type: OpenAPI
    url: openapi/blockchair-outputs-database-api-openapi.yml
  - type: Documentation
    url: https://blockchair.com/api/docs
  - type: APIReference
    url: https://github.com/Blockchair/Blockchair.Support/blob/master/API_DOCUMENTATION_EN.md
  - type: PostmanCollection
    url: collections/blockchair.postman_collection.json
  - type: OpenCollection
    url: collections/blockchair.opencollection.json
- aid: blockchair:blockchair-raw-data-api
  name: Blockchair Raw Data API
  description: Raw node-level block and transaction data.
  humanURL: https://blockchair.com/api/docs
  baseURL: https://api.blockchair.com
  tags:
  - Raw Data
  properties:
  - type: OpenAPI
    url: openapi/blockchair-raw-data-api-openapi.yml
  - type: Documentation
    url: https://blockchair.com/api/docs
  - type: APIReference
    url: https://github.com/Blockchair/Blockchair.Support/blob/master/API_DOCUMENTATION_EN.md
  - type: PostmanCollection
    url: collections/blockchair.postman_collection.json
  - type: OpenCollection
    url: collections/blockchair.opencollection.json
- aid: blockchair:blockchair-stats-api
  name: Blockchair Stats API
  description: Network and chain statistics.
  humanURL: https://blockchair.com/api/docs
  baseURL: https://api.blockchair.com
  tags:
  - Stats
  properties:
  - type: OpenAPI
    url: openapi/blockchair-stats-api-openapi.yml
  - type: Documentation
    url: https://blockchair.com/api/docs
  - type: APIReference
    url: https://github.com/Blockchair/Blockchair.Support/blob/master/API_DOCUMENTATION_EN.md
  - type: PostmanCollection
    url: collections/blockchair.postman_collection.json
  - type: OpenCollection
    url: collections/blockchair.opencollection.json
- aid: blockchair:blockchair-transaction-dashboards-api
  name: Blockchair Transaction Dashboards API
  description: Parsed transaction dashboards.
  humanURL: https://blockchair.com/api/docs
  baseURL: https://api.blockchair.com
  tags:
  - Transaction Dashboards
  properties:
  - type: OpenAPI
    url: openapi/blockchair-transaction-dashboards-api-openapi.yml
  - type: Documentation
    url: https://blockchair.com/api/docs
  - type: APIReference
    url: https://github.com/Blockchair/Blockchair.Support/blob/master/API_DOCUMENTATION_EN.md
  - type: PostmanCollection
    url: collections/blockchair.postman_collection.json
  - type: OpenCollection
    url: collections/blockchair.opencollection.json
common:
- type: AgenticAccess
  url: agentic-access/blockchair-agentic-access.yml
- type: DomainSecurity
  url: security/blockchair-domain-security.yml
- type: Authentication
  url: authentication/blockchair-authentication.yml
- type: GitHubOrganization
  url: https://github.com/Blockchair
- type: LinkedIn
  url: https://www.linkedin.com/company/blockchair
- type: Website
  url: https://blockchair.com
- type: Documentation
  url: https://blockchair.com/api/docs
- type: Plans
  url: plans/blockchair-plans-pricing.yml
- type: RateLimits
  url: rate-limits/blockchair-rate-limits.yml
- type: FinOps
  url: finops/blockchair-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Blockchair API — frequently asked questions

Does Blockchair have an API?

Yes. APIs.io lists 7 APIs from Blockchair, including Blockchair Address Dashboards API, Blockchair Block Dashboards API and Blockchair Broadcast API, and 4 more.

Is there an OpenAPI specification for the Blockchair API?

Yes. APIs.io indexes 7 OpenAPI specifications for Blockchair, each linked for download from this page.

How do I authenticate with the Blockchair API?

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

How much does the Blockchair API cost?

APIs.io lists 6 pricing plans for Blockchair, with each plan's price, limits and inclusions under Pricing on this page.

Is the Blockchair API ready for AI agents?

Blockchair has a Kin Score of 26.5 out of 100 (thin) and an Agent Readiness score of 22.4 (agent-aware), scored by API Evangelist on 2026-11-06.

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