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

20.6/100 emerging ▬ flat Agent 19/100 agent aware Full breakdown ↓
scored 2026-09-19 · rubric v0.22.0

AccessOpen

7 APIs

Company Bitcoin Blockchain Cryptocurrency Block Explorer Financial-Services Infrastructure

Kin Score

Kin Score How this is scored →
scored 2026-09-19 · rubric v0.22.0

Composite quality — 20.6/100 · emerging

Contract Quality 2.6 / 23

Developer Ergonomics 8.5 / 18

Access Clarity 0.0 / 18

Operational Transparency 0.3 / 12

Contract Governance 0.5 / 11

Discoverability 7.3 / 9

Create-or-Update Ergonomics 0.0 / 10

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

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.

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 github.com/api-evangelist/blockstream: open an issue to ask a question, or submit a pull request to add artifacts. 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 8

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

API Collection

OPEN COLLECTION

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 8

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
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

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