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 API contracts indexed 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 and 1 Spectral governance ruleset.

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

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40.5/100 developing ▬ flat Agent 30/100 agent ready Front door AI 1/6 silent Heartbeat 2/100 dormant Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessOpen

1 published contract 2 Agent Skills

Company Infrastructure Blockchain Consensus Cosmos Web3 JSON-RPC Node

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 40.5/100 · developing

Contract Quality 10.5 / 21

Developer Ergonomics 10.0 / 17

Access Clarity 0.0 / 17

Operational Transparency 4.9 / 11

Contract Governance 1.9 / 10

Discoverability 6.2 / 9

Regulatory Posture 3.4 / 15

Agent readiness — 30/100 · 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

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

MCP Tool Quality 6 / 6

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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

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
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)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

4 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 0.0 — up to +20.0 composite points
Contract Quality scores 49.2 — up to +12.7 composite points
Contract Governance scores 18.2 — up to +9.8 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/tendermint/apis.yml: open an issue on github.com/api-evangelist/tendermint 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Buf Schema Registry (public Protocol Buffers modules, gRPC / ConnectRPC schema publishers)	standard	26.8 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

JSON RPC

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

OpenAPI

measured — observed by APIs.io (published)

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 5

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

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

Agent Skills 2

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

Broadcast and track a transaction

AGENT SKILL

Query Tendermint chain state

AGENT SKILL

Event Specifications 1

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

Tendermint Events Webhooks

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Tendermint API Rules

56 rules · 49 errors 5 warnings 2 info

SPECTRAL

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.

Tendermint Rpc Overlay

5 actions · update · tendermint-rpc-openapi-original.yml

DERIVED

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

X-MCPServerCandidate

X-MCPServerCandidate

AgentSkill

AgentSkill

LLMsTxt

LLMsTxt

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

DataModel

Conformance

Lifecycle

Webhooks

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

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)

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.
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
  gated: none
  gated_source:
  - onboarding
  label: Open access
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  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: X-MCPServerCandidate
  url: mcp/tendermint-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: 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

Tendermint API — frequently asked questions

Does Tendermint have an API?

Yes. APIs.io lists 5 APIs from Tendermint, including Tendermint ABCI API, Tendermint Info API and Tendermint Tx API, and 2 more.

Is there an OpenAPI specification for the Tendermint API?

Yes. APIs.io indexes 5 OpenAPI specifications for Tendermint, each linked for download from this page.

How do I authenticate with the Tendermint API?

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

Is the Tendermint API ready for AI agents?

Tendermint has a Kin Score of 40.5 out of 100 (developing) and an Agent Readiness score of 30.3 (agent-ready), scored by API Evangelist on 2026-11-06.

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