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 19 more developer resources.

🌐 Visit website 📡 Source on GitHub
45.6/100 developing ▬ flat Agent 57/100 agent ready Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessOpen
5 APIs 1 MCP Servers
CompanyInfrastructureBlockchainConsensusCosmosWeb3JSON-RPCNode

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 45.6/100 · developing
Contract Quality 15.1 / 25
Developer Ergonomics 14.3 / 20
Commercial Clarity 0.0 / 20
Operational Transparency 6.2 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 57/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 15
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 6 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
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.

MCP Servers 1

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

tendermint-mcp.yml

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 1

Properties that don't map to a standard resource type

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: '0.20'
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
  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: 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