Blockstream

Blockstream is a Bitcoin infrastructure company whose products include the Liquid Network sidechain, the Green self-custody wallet, Blockstream Satellite, and Bitcoin mining and data services. For developers its flagship public API is Esplora, the open-source Bitcoin block explorer behind blockstream.info: a no-authentication HTTP REST API for reading blocks, transactions, addresses, scripthashes, the mempool, and fee estimates across Bitcoin mainnet, testnet, and signet, plus Liquid/Elements issued assets. Amounts are returned in satoshis and hashes are hex-encoded, with cursor pagination over confirmed transaction history. Blockstream also ships GDK, its open-source cross-platform wallet SDK.

Blockstream is listed with 7 APIs on the APIs.io network, including Addresses API, Assets API, Blocks API, and 4 more. Tagged areas include Company, Bitcoin, Blockchain, Cryptocurrency, and Block Explorer.

Blockstream’s developer surface includes documentation, engineering blog, authentication, sandbox, and 15 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

20.9/100 emerging ▬ flat Agent 19/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

AccessOpen

7 APIs 1 Agent Skills

Company Bitcoin Blockchain Cryptocurrency Block Explorer Financial Services Infrastructure

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 20.9/100 · emerging

Contract Quality 2.4 / 21

Developer Ergonomics 8.0 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.6 / 11

Contract Governance 0.5 / 10

Discoverability 6.1 / 9

Regulatory Posture 2.5 / 15

Agent readiness — 19/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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

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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

9 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 11.5 — up to +22.1 composite points
Access Clarity scores 0.0 — up to +20.0 composite points
Operational Transparency scores 5.3 — up to +12.3 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/blockstream/apis.yml: open an issue on github.com/api-evangelist/blockstream 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 →

APIs 7

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

Blockstream Addresses API

The Addresses API from Blockstream — 11 operation(s) for addresses.

Blockstream Assets API

The Assets API from Blockstream — 7 operation(s) for assets.

Blockstream Blocks API

The Blocks API from Blockstream — 11 operation(s) for blocks.

Blockstream Fee Estimates API

The Fee Estimates API from Blockstream — 1 operation(s) for fee estimates.

Blockstream Mempool API

The Mempool API from Blockstream — 3 operation(s) for mempool.

Blockstream Mining API

The Mining API from Blockstream — 1 operation(s) for mining.

Blockstream Transactions API

The Transactions API from Blockstream — 10 operation(s) for transactions.

Scroll for all 7

Open Collections 7

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

Blockstream Esplora HTTP Addresses API

OPEN COLLECTION

Blockstream Esplora HTTP Addresses Assets API

OPEN COLLECTION

Blockstream Esplora HTTP Addresses Blocks API

OPEN COLLECTION

Blockstream Esplora HTTP Addresses Fee Estimates API

OPEN COLLECTION

Blockstream Esplora HTTP Addresses Mempool API

OPEN COLLECTION

Blockstream Esplora HTTP Addresses Mining API

OPEN COLLECTION

Blockstream Esplora HTTP Addresses Transactions API

OPEN COLLECTION

Scroll for all 7

Agent Skills 1

Packaged agent skills for driving this provider's APIs from an AI assistant.

Check a Bitcoin address balance and history

AGENT SKILL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Blockstream Esplora Overlay

2 actions · update · blockstream-esplora-openapi.yml

DERIVED

Security Posture 2

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

Blockstream Authentication

0 schemes

SECURITY

Blockstream Domain Security

TLSv1.3 · HSTS · DNSSEC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Sandbox

Sandbox

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

X-MCPServerCandidate

LLMsTxt

WellKnown

AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

DataModel

Lifecycle

Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

SDKs

SDKs

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: blockstream
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: open
  trial: false
  try_now: false
  public: true
  label: Open access
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/blockstream.png
name: Blockstream
description: 'Blockstream is a Bitcoin infrastructure company whose products include the Liquid Network sidechain, the Green
  self-custody wallet, Blockstream Satellite, and Bitcoin mining and data services. For developers its flagship public API
  is Esplora, the open-source Bitcoin block explorer behind blockstream.info: a no-authentication HTTP REST API for reading
  blocks, transactions, addresses, scripthashes, the mempool, and fee estimates across Bitcoin mainnet, testnet, and signet,
  plus Liquid/Elements issued assets. Amounts are returned in satoshis and hashes are hex-encoded, with cursor pagination
  over confirmed transaction history. Blockstream also ships GDK, its open-source cross-platform wallet SDK.'
url: https://raw.githubusercontent.com/api-evangelist/blockstream/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- dcvc
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-09-16'
tags:
- Company
- Bitcoin
- Blockchain
- Cryptocurrency
- Block Explorer
- Financial Services
- Infrastructure
tags_raw:
- Company
- Bitcoin
- Blockchain
- Cryptocurrency
- Block Explorer
- Financial Services
- Infrastructure
- Financial-Services
apis:
- aid: blockstream:blockstream-addresses-api
  name: Blockstream Addresses API
  description: The Addresses API from Blockstream — 11 operation(s) for addresses.
  humanURL: https://github.com/Blockstream/esplora/blob/master/API.md
  baseURL: https://blockstream.info/api
  tags:
  - Addresses
  properties:
  - type: OpenAPI
    url: openapi/blockstream-addresses-api-openapi.yml
  - type: APIReference
    url: https://github.com/Blockstream/esplora/blob/master/API.md
  - type: Sandbox
    url: sandbox/blockstream-sandbox.yml
- aid: blockstream:blockstream-assets-api
  name: Blockstream Assets API
  description: The Assets API from Blockstream — 7 operation(s) for assets.
  humanURL: https://github.com/Blockstream/esplora/blob/master/API.md
  baseURL: https://blockstream.info/api
  tags:
  - Assets
  properties:
  - type: OpenAPI
    url: openapi/blockstream-assets-api-openapi.yml
  - type: APIReference
    url: https://github.com/Blockstream/esplora/blob/master/API.md
  - type: Sandbox
    url: sandbox/blockstream-sandbox.yml
- aid: blockstream:blockstream-blocks-api
  name: Blockstream Blocks API
  description: The Blocks API from Blockstream — 11 operation(s) for blocks.
  humanURL: https://github.com/Blockstream/esplora/blob/master/API.md
  baseURL: https://blockstream.info/api
  tags:
  - Blocks
  properties:
  - type: OpenAPI
    url: openapi/blockstream-blocks-api-openapi.yml
  - type: APIReference
    url: https://github.com/Blockstream/esplora/blob/master/API.md
  - type: Sandbox
    url: sandbox/blockstream-sandbox.yml
- aid: blockstream:blockstream-fee-estimates-api
  name: Blockstream Fee Estimates API
  description: The Fee Estimates API from Blockstream — 1 operation(s) for fee estimates.
  humanURL: https://github.com/Blockstream/esplora/blob/master/API.md
  baseURL: https://blockstream.info/api
  tags:
  - Fee Estimates
  properties:
  - type: OpenAPI
    url: openapi/blockstream-fee-estimates-api-openapi.yml
  - type: APIReference
    url: https://github.com/Blockstream/esplora/blob/master/API.md
  - type: Sandbox
    url: sandbox/blockstream-sandbox.yml
- aid: blockstream:blockstream-mempool-api
  name: Blockstream Mempool API
  description: The Mempool API from Blockstream — 3 operation(s) for mempool.
  humanURL: https://github.com/Blockstream/esplora/blob/master/API.md
  baseURL: https://blockstream.info/api
  tags:
  - Mempool
  properties:
  - type: OpenAPI
    url: openapi/blockstream-mempool-api-openapi.yml
  - type: APIReference
    url: https://github.com/Blockstream/esplora/blob/master/API.md
  - type: Sandbox
    url: sandbox/blockstream-sandbox.yml
- aid: blockstream:blockstream-mining-api
  name: Blockstream Mining API
  description: The Mining API from Blockstream — 1 operation(s) for mining.
  humanURL: https://github.com/Blockstream/esplora/blob/master/API.md
  baseURL: https://blockstream.info/api
  tags:
  - Mining
  properties:
  - type: OpenAPI
    url: openapi/blockstream-mining-api-openapi.yml
  - type: APIReference
    url: https://github.com/Blockstream/esplora/blob/master/API.md
  - type: Sandbox
    url: sandbox/blockstream-sandbox.yml
- aid: blockstream:blockstream-transactions-api
  name: Blockstream Transactions API
  description: The Transactions API from Blockstream — 10 operation(s) for transactions.
  humanURL: https://github.com/Blockstream/esplora/blob/master/API.md
  baseURL: https://blockstream.info/api
  tags:
  - Transaction
  tags_raw:
  - Transactions
  properties:
  - type: OpenAPI
    url: openapi/blockstream-transactions-api-openapi.yml
  - type: APIReference
    url: https://github.com/Blockstream/esplora/blob/master/API.md
  - type: Sandbox
    url: sandbox/blockstream-sandbox.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://blockstream.info
- type: Documentation
  url: https://github.com/Blockstream/esplora/blob/master/API.md
- type: GitHubOrganization
  url: https://github.com/Blockstream
- type: Blog
  url: https://blockstream.com/blog/
- type: Overlay
  url: overlays/blockstream-esplora-overlay.yaml
- type: Authentication
  url: authentication/blockstream-authentication.yml
- type: Conventions
  url: conventions/blockstream-conventions.yml
- type: ErrorCatalog
  url: errors/blockstream-problem-types.yml
- type: DataModel
  url: data-model/blockstream-data-model.yml
- type: Lifecycle
  url: lifecycle/blockstream-lifecycle.yml
- type: Conformance
  url: conformance/blockstream-conformance.yml
- type: Packages
  url: packages/blockstream-packages.yml
- type: SDKs
  url: packages/blockstream-packages.yml
- type: X-MCPServerCandidate
  url: mcp/blockstream-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: LLMsTxt
  url: llms/blockstream-llms.txt
- type: WellKnown
  url: well-known/blockstream-well-known.yml
- type: Sandbox
  url: sandbox/blockstream-sandbox.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DomainSecurity
  url: security/blockstream-domain-security.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

Blockstream API — frequently asked questions

Does Blockstream have an API?

Yes. APIs.io lists 7 APIs from Blockstream, including Blockstream Addresses API, Blockstream Assets API and Blockstream Blocks API, and 4 more.

Is there an OpenAPI specification for the Blockstream API?

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

How do I authenticate with the Blockstream API?

Blockstream uses bearer-token authentication (0 schemes). The details are profiled on APIs.io as Blockstream Authentication.

Is the Blockstream API ready for AI agents?

Blockstream has a Kin Score of 20.9 out of 100 (emerging) and an Agent Readiness score of 18.8 (agent-aware), scored by API Evangelist on 2026-10-31.

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