Blockstream website screenshot

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 publishes 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 📡 Source on GitHub
32.2/100 thin ▬ flat Agent 36/100 agent ready Full breakdown ↓
scored 2026-08-10 · rubric v0.9.1
AccessOpen
7 APIs 1 MCP Servers
CompanyBitcoinBlockchainCryptocurrencyBlock ExplorerFinancial ServicesInfrastructure

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-10 · rubric v0.9.1
Composite quality — 32.2/100 · thin
Contract Quality 13.2 / 25
Developer Ergonomics 7.7 / 20
Commercial Clarity 0.0 / 20
Operational Transparency 0.7 / 13
Governance 1.4 / 12
Discoverability 9.3 / 10
Agent readiness — 36/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 10
MCP Server 12 / 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 4 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/blockstream: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

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

MCP Servers 1

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

blockstream-mcp.yml

MCP SERVER

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 2

Reference material describing how the API behaves

Documentation
Documentation
 OpenAPI
OpenAPI

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 LLMsTxt
LLMsTxt
 WellKnown
WellKnown
 AgentSkill
AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 ErrorCatalog
ErrorCatalog
 DataModel
DataModel
 Lifecycle
Lifecycle
 Conformance
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 1

The organization behind the API

Blog
Blog

Other 1

Properties that don't map to a standard resource type

Overlay
Overlay

Source (apis.yml)

apis.yml Raw ↑ 
aid: blockstream
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: '0.20'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Bitcoin
- Blockchain
- Cryptocurrency
- Block Explorer
- Financial Services
- Infrastructure
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:
  - 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: 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: OpenAPI
  url: openapi/_original/blockstream-esplora-openapi.yml
- 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: MCPServer
  url: mcp/blockstream-mcp.yml
- 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