Tendermint website screenshot

Tendermint

Tendermint is a core contributor to the Cosmos Network and the original developer of Tendermint Core, a best-in-class Byzantine Fault Tolerant (BFT) consensus engine for state-machine replication, alongside the Cosmos SDK blockchain application framework and the IBC inter-blockchain communication protocol. Its primary developer-facing API is the Tendermint RPC — a JSONRPC 2.0 interface (also exposed as a REST-URI form and over websockets) for querying chain state, blocks, transactions and validators, and broadcasting transactions to a node. Tendermint Core has since been renamed to CometBFT, which is the actively maintained successor.

Tendermint publishes 5 APIs on the APIs.io network, including ABCI API, Info API, Tx API, and 2 more. Tagged areas include Company, Infrastructure, Blockchain, Consensus, and Cosmos.

The Tendermint catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Tendermint’s developer surface includes documentation, API reference, getting-started guide, engineering blog, support, CLI, authentication, and 20 more developer resources.

🌐 Visit website 📡 Source on GitHub
42.0/100 developing ▬ flat Agent 43/100 agent ready Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0
AccessOpen
5 APIs 1 MCP Servers
CompanyInfrastructureBlockchainConsensusCosmosWeb3JSON-RPCNode

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0
Composite quality — 42.0/100 · developing
Contract Quality 14.2 / 25
Developer Ergonomics 11.8 / 20
Access Clarity 0.0 / 20
Operational Transparency 5.8 / 13
Contract Governance 2.0 / 12
Discoverability 8.2 / 10
Agent readiness — 43/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 6 / 6
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 9 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 7 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 6 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 4 / 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/tendermint: 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 5

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

Tendermint ABCI API

ABCI APIs

Tendermint Info API

Informations about the node APIs

Tendermint Tx API

Transactions broadcast APIs

Tendermint Unsafe API

Unsafe APIs

Tendermint Websocket API

Subscribe/unsubscribe are reserved for websocket events.

Open Collections 6

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

API Collection

OPEN COLLECTION

Tendermint RPC ABCI API

OPEN COLLECTION

Tendermint RPC ABCI Info API

OPEN COLLECTION

Tendermint RPC ABCI Tx API

OPEN COLLECTION

Tendermint RPC ABCI Unsafe API

OPEN COLLECTION

Tendermint RPC ABCI Websocket API

OPEN COLLECTION

MCP Servers 1

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

Tendermint MCP Server

MCP SERVER

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Tendermint Events Webhooks

ASYNCAPI

Security Posture 3

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

Tendermint Authentication

0 schemes

SECURITY

Tendermint Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Tendermint Vulnerability Disclosure

Hackerone · contact published

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted
GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 AgentSkill
AgentSkill
 LLMsTxt
LLMsTxt

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 ErrorCatalog
ErrorCatalog
 DataModel
DataModel
 Conformance
Conformance
 Lifecycle
Lifecycle
 Webhooks
Webhooks

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs
 CLI
CLI

Access & Security 4

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication
 VulnerabilityDisclosure
VulnerabilityDisclosure
 Security
Security

Operate 3

Status, limits, changes, and where to get help

Support
Support
 Deprecation
Deprecation
 ChangeLog
ChangeLog

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 2

Properties that don't map to a standard resource type

Overlay
Overlay
 Protobuf
Protobuf

Source (apis.yml)

apis.yml Raw ↑ 
aid: tendermint
name: Tendermint
description: Tendermint is a core contributor to the Cosmos Network and the original developer of Tendermint Core, a best-in-class
  Byzantine Fault Tolerant (BFT) consensus engine for state-machine replication, alongside the Cosmos SDK blockchain application
  framework and the IBC inter-blockchain communication protocol. Its primary developer-facing API is the Tendermint RPC —
  a JSONRPC 2.0 interface (also exposed as a REST-URI form and over websockets) for querying chain state, blocks, transactions
  and validators, and broadcasting transactions to a node. Tendermint Core has since been renamed to CometBFT, which is the
  actively maintained successor.
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://raw.githubusercontent.com/api-evangelist/tendermint/main/apis.yml
url: https://raw.githubusercontent.com/api-evangelist/tendermint/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- polychain
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 20
  pass: local-v1
tags:
- Company
- Infrastructure
- Blockchain
- Consensus
- Cosmos
- Web3
- JSON-RPC
- Node
apis:
- aid: tendermint:tendermint-abci-api
  name: Tendermint ABCI API
  description: ABCI APIs
  humanURL: https://docs.tendermint.com/master/rpc/
  baseURL: https://rpc.cosmos.network
  tags:
  - ABCI
  properties:
  - type: OpenAPI
    url: openapi/tendermint-abci-api-openapi.yml
- aid: tendermint:tendermint-info-api
  name: Tendermint Info API
  description: Informations about the node APIs
  humanURL: https://docs.tendermint.com/master/rpc/
  baseURL: https://rpc.cosmos.network
  tags:
  - Info
  properties:
  - type: OpenAPI
    url: openapi/tendermint-info-api-openapi.yml
- aid: tendermint:tendermint-tx-api
  name: Tendermint Tx API
  description: Transactions broadcast APIs
  humanURL: https://docs.tendermint.com/master/rpc/
  baseURL: https://rpc.cosmos.network
  tags:
  - Tx
  properties:
  - type: OpenAPI
    url: openapi/tendermint-tx-api-openapi.yml
- aid: tendermint:tendermint-unsafe-api
  name: Tendermint Unsafe API
  description: Unsafe APIs
  humanURL: https://docs.tendermint.com/master/rpc/
  baseURL: https://rpc.cosmos.network
  tags:
  - Unsafe
  properties:
  - type: OpenAPI
    url: openapi/tendermint-unsafe-api-openapi.yml
- aid: tendermint:tendermint-websocket-api
  name: Tendermint Websocket API
  description: Subscribe/unsubscribe are reserved for websocket events.
  humanURL: https://docs.tendermint.com/master/rpc/
  baseURL: https://rpc.cosmos.network
  tags:
  - WebSocket
  tags_raw:
  - Websocket
  properties:
  - type: OpenAPI
    url: openapi/tendermint-websocket-api-openapi.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Overlay
  url: overlays/tendermint-rpc-overlay.yaml
- type: DomainSecurity
  url: security/tendermint-domain-security.yml
- type: Website
  url: https://tendermint.com
- type: Documentation
  url: https://docs.tendermint.com/
- type: APIReference
  url: https://docs.tendermint.com/master/rpc/
- type: GettingStarted
  url: https://docs.tendermint.com/master/introduction/quick-start.html
- type: GitHubOrganization
  url: https://github.com/tendermint
- type: Blog
  url: https://medium.com/tendermint
- type: Support
  url: https://forum.cosmos.network/c/tendermint
- type: Packages
  url: packages/tendermint-packages.yml
- type: SDKs
  url: packages/tendermint-packages.yml
- type: CLI
  url: cli/tendermint-cli.yml
- type: MCPServer
  url: mcp/tendermint-mcp.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/tendermint-llms.txt
- type: Authentication
  url: authentication/tendermint-authentication.yml
- type: Conventions
  url: conventions/tendermint-conventions.yml
- type: ErrorCatalog
  url: errors/tendermint-problem-types.yml
- type: DataModel
  url: data-model/tendermint-data-model.yml
- type: Conformance
  url: conformance/tendermint-conformance.yml
- type: Lifecycle
  url: lifecycle/tendermint-lifecycle.yml
- type: Deprecation
  url: lifecycle/tendermint-lifecycle.yml
- type: ChangeLog
  url: changelog/tendermint-changelog.yml
- type: Webhooks
  url: asyncapi/tendermint-events-webhooks.yml
- type: Protobuf
  url: grpc/tendermint-abci.proto
- type: VulnerabilityDisclosure
  url: security/tendermint-vulnerability-disclosure.yml
- type: Security
  url: https://github.com/tendermint/tendermint/blob/main/SECURITY.md