XMTP

XMTP (Extensible Message Transport Protocol) is a decentralized, open messaging protocol that enables end-to-end encrypted communication between Ethereum wallet addresses and other decentralized identifiers. Built on MLS (Messaging Layer Security), XMTP provides developer SDKs and a gRPC-based network API for sending encrypted messages in decentralized applications, AI agents, and Web3 wallets without relying on centralized servers.

XMTP is listed with 7 APIs on the APIs.io network, including Network gRPC API, and 6 more. Tagged areas include Web3, Messaging, Encryption, Decentralized, and Ethereum.

XMTP’s developer surface includes GitHub presence, engineering blog, status page, and 16 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

27.2/100 thin ▬ flat Agent 16/100 agent aware Front door AI 1/6 silent Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFree

7 APIs

Web3 Messaging Encryption Decentralized Ethereum MLS Wallets Agents

Kin Score

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

Composite quality — 27.2/100 · thin

Contract Quality 5.1 / 21

Developer Ergonomics 4.5 / 17

Access Clarity 4.9 / 17

Operational Transparency 2.9 / 11

Contract Governance 0.0 / 10

Discoverability 6.7 / 9

Regulatory Posture 1.9 / 15

Agent readiness — 16/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Payments 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

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
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0

11 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 24.0 — up to +19.0 composite points
Developer Ergonomics scores 26.2 — up to +14.8 composite points
Access Clarity scores 28.9 — up to +14.2 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/xmtp/apis.yml: open an issue on github.com/api-evangelist/xmtp 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	17.2 (thin)	-	-
Matrix Protocol Ecosystem (Matrix.org Foundation directory)	standard	17.2 (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.

The Ethereum JSON-RPC Interface

prose — states compatibility; nothing published to check it against

22 core of 78 operations graded · api-commons/blockchain

OpenAPI

measured — observed by APIs.io (published)

APIs 7

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

XMTP Network gRPC API

Core gRPC-based API for the XMTP decentralized messaging network. Provides operations for sending and retrieving encrypted group messages, managing MLS key packages, publishing ...

XMTP JavaScript/TypeScript SDK

Client SDK for browsers and Node.js enabling applications to send and receive end-to-end encrypted messages via the XMTP network. Supports wallet-based authentication (EVM-compa...

XMTP Agent SDK

Node.js SDK tailored for building AI agents and bots on the XMTP network. Enables agents to participate in XMTP conversations, respond to messages, and interact with users throu...

XMTP Android SDK

Native Kotlin SDK for integrating XMTP encrypted messaging into Android applications. Supports wallet-based identity, group conversations, message streaming, and the full XMTP c...

XMTP iOS SDK

Native Swift SDK for integrating XMTP encrypted messaging into iOS applications. Provides wallet-based authentication, group conversations, real-time message streaming, and comp...

XMTP React Native SDK

Cross-platform SDK for building XMTP encrypted messaging into React Native and Expo applications. Bridges the libxmtp core library to JavaScript, enabling wallet-based messaging...

XMTP App Chain RPC API

JSON-RPC API for the XMTP Layer-3 appchain built on Arbitrum and settling to Base. Used for smart contract interactions including group management, identity updates, node regist...

Scroll for all 7

XMTP API pricing

Not yet checked against XMTP's own pricing page. Compiled by API Evangelist on 2026-06-13; confirm before you rely on a figure.

Plan	Price
Open Developer Access	—
Mainnet Usage (Pay-per-message)	—
Node Operator	—

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Plans

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Rate Limits

2 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

XMTP

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Finops

FINOPS

Security Posture 1

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

Xmtp Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Build 2

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

GitHub

GitHub

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 7

Status, limits, changes, and where to get help

RateLimits

IssueTracker

Releases

Community

Status

DecentralizationRoadmap

DecentralizationRoadmap

Contact

Contact

Scroll for all 7

Commercial 4

Pricing, plans, and the legal terms of use

Plans

FinOps

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

ImprovementProposals

ImprovementProposals

FeeCalculator

FeeCalculator

Source (apis.yml)

name: XMTP
description: XMTP (Extensible Message Transport Protocol) is a decentralized, open messaging protocol that enables end-to-end
  encrypted communication between Ethereum wallet addresses and other decentralized identifiers. Built on MLS (Messaging Layer
  Security), XMTP provides developer SDKs and a gRPC-based network API for sending encrypted messages in decentralized applications,
  AI agents, and Web3 wallets without relying on centralized servers.
deliveryModel:
  model: saas
  license_evidence:
    not_product:
    - xmtp/agent-sdk-starter
    - xmtp/xmtp-android
    - xmtp/xmtp-ios
    - xmtp/xmtp-js
    - xmtp/xmtp-react-native
  open_source: unknown
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: low
  source:
  - pricing
  - repository-not-product
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: free
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Free
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://xmtp.org/img/xmtp-icon.png
tags:
- Web3
- Messaging
- Encryption
- Decentralized
- Ethereum
- MLS
- Wallets
- Agents
url: https://xmtp.org
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.23'
apis:
- name: XMTP Network gRPC API
  description: Core gRPC-based API for the XMTP decentralized messaging network. Provides operations for sending and retrieving
    encrypted group messages, managing MLS key packages, publishing identity updates, and streaming real-time message events.
    All messages are end-to-end encrypted using the MLS protocol standard. Node operators expose this API over TLS-secured
    public DNS endpoints.
  image: https://xmtp.org/img/xmtp-icon.png
  humanURL: https://docs.xmtp.org
  baseURL: grpc://grpc.xmtp.network
  tags:
  - gRPC
  - Messaging
  - Encryption
  - MLS
  - Web3
  properties:
  - type: Documentation
    url: https://docs.xmtp.org
  - type: OpenAPI
    url: https://github.com/xmtp/proto
  - type: ProtocolBuffers
    url: https://github.com/xmtp/proto
  - type: GettingStarted
    url: https://docs.xmtp.org/chat-apps/intro/get-started
  - type: LibXMTPDocs
    url: https://xmtp-libxmtp.mintlify.app/api/xmtp-api
  - type: NodeImplementation
    url: https://github.com/xmtp/xmtpd
  - type: NetworkStatus
    url: https://status.xmtp.org
  - type: Plans
    url: https://xmtp.org/xmtp/plans.yml
  - type: RateLimits
    url: https://xmtp.org/xmtp/rate-limits.yml
  - type: FinOps
    url: https://xmtp.org/xmtp/finops.yml
  contact:
  - FN: XMTP Support
    email: contact@xmtp.org
    url: https://community.xmtp.org
- name: XMTP JavaScript/TypeScript SDK
  description: Client SDK for browsers and Node.js enabling applications to send and receive end-to-end encrypted messages
    via the XMTP network. Supports wallet-based authentication (EVM-compatible wallets using ECDSA signing), group conversations,
    message streaming, consent management, and rich content types including text, attachments, reactions, and read receipts.
  image: https://xmtp.org/img/xmtp-icon.png
  humanURL: https://github.com/xmtp/xmtp-js
  baseURL: https://xmtp.network
  tags:
  - JavaScript
  - TypeScript
  - SDK
  - Browser
  - Node.js
  - Messaging
  properties:
  - type: Documentation
    url: https://docs.xmtp.org/chat-apps/intro/get-started
  - type: GitHubRepository
    url: https://github.com/xmtp/xmtp-js
  - type: GettingStarted
    url: https://docs.xmtp.org/chat-apps/intro/get-started
  - type: Plans
    url: https://xmtp.org/xmtp/plans.yml
  - type: RateLimits
    url: https://xmtp.org/xmtp/rate-limits.yml
  - type: FinOps
    url: https://xmtp.org/xmtp/finops.yml
  contact:
  - FN: XMTP Support
    email: contact@xmtp.org
    url: https://community.xmtp.org
- name: XMTP Agent SDK
  description: Node.js SDK tailored for building AI agents and bots on the XMTP network. Enables agents to participate in
    XMTP conversations, respond to messages, and interact with users through encrypted decentralized messaging channels. Designed
    for autonomous agent deployments that need secure, censorship- resistant communication without centralized infrastructure
    dependencies.
  image: https://xmtp.org/img/xmtp-icon.png
  humanURL: https://docs.xmtp.org
  baseURL: https://xmtp.network
  tags:
  - Agents
  - Artificial Intelligence
  - Node.js
  - SDK
  - Automation
  tags_raw:
  - Agents
  - AI
  - Node.js
  - SDK
  - Automation
  properties:
  - type: Documentation
    url: https://docs.xmtp.org
  - type: GitHubRepository
    url: https://github.com/xmtp/agent-sdk-starter
  - type: GettingStarted
    url: https://docs.xmtp.org
  - type: Plans
    url: https://xmtp.org/xmtp/plans.yml
  - type: RateLimits
    url: https://xmtp.org/xmtp/rate-limits.yml
  - type: FinOps
    url: https://xmtp.org/xmtp/finops.yml
  contact:
  - FN: XMTP Support
    email: contact@xmtp.org
    url: https://community.xmtp.org
- name: XMTP Android SDK
  description: Native Kotlin SDK for integrating XMTP encrypted messaging into Android applications. Supports wallet-based
    identity, group conversations, message streaming, and the full XMTP content type system for rich media and transactional
    messages in mobile apps.
  image: https://xmtp.org/img/xmtp-icon.png
  humanURL: https://github.com/xmtp/xmtp-android
  baseURL: https://xmtp.network
  tags:
  - Android
  - Kotlin
  - Mobile
  - SDK
  - Messaging
  properties:
  - type: Documentation
    url: https://docs.xmtp.org
  - type: GitHubRepository
    url: https://github.com/xmtp/xmtp-android
  - type: Plans
    url: https://xmtp.org/xmtp/plans.yml
  - type: RateLimits
    url: https://xmtp.org/xmtp/rate-limits.yml
  - type: FinOps
    url: https://xmtp.org/xmtp/finops.yml
  contact:
  - FN: XMTP Support
    email: contact@xmtp.org
    url: https://community.xmtp.org
- name: XMTP iOS SDK
  description: Native Swift SDK for integrating XMTP encrypted messaging into iOS applications. Provides wallet-based authentication,
    group conversations, real-time message streaming, and comprehensive content type support for building secure, decentralized
    messaging features in iOS and macOS apps.
  image: https://xmtp.org/img/xmtp-icon.png
  humanURL: https://github.com/xmtp/xmtp-ios
  baseURL: https://xmtp.network
  tags:
  - iOS
  - Swift
  - Mobile
  - SDK
  - Messaging
  properties:
  - type: Documentation
    url: https://docs.xmtp.org
  - type: GitHubRepository
    url: https://github.com/xmtp/xmtp-ios
  - type: Plans
    url: https://xmtp.org/xmtp/plans.yml
  - type: RateLimits
    url: https://xmtp.org/xmtp/rate-limits.yml
  - type: FinOps
    url: https://xmtp.org/xmtp/finops.yml
  contact:
  - FN: XMTP Support
    email: contact@xmtp.org
    url: https://community.xmtp.org
- name: XMTP React Native SDK
  description: Cross-platform SDK for building XMTP encrypted messaging into React Native and Expo applications. Bridges the
    libxmtp core library to JavaScript, enabling wallet-based messaging, group chats, streaming, and rich content types in
    cross-platform mobile applications targeting both iOS and Android.
  image: https://xmtp.org/img/xmtp-icon.png
  humanURL: https://github.com/xmtp/xmtp-react-native
  baseURL: https://xmtp.network
  tags:
  - React Native
  - Expo
  - Mobile
  - SDK
  - Cross-Platform
  properties:
  - type: Documentation
    url: https://docs.xmtp.org
  - type: GitHubRepository
    url: https://github.com/xmtp/xmtp-react-native
  - type: Plans
    url: https://xmtp.org/xmtp/plans.yml
  - type: RateLimits
    url: https://xmtp.org/xmtp/rate-limits.yml
  - type: FinOps
    url: https://xmtp.org/xmtp/finops.yml
  contact:
  - FN: XMTP Support
    email: contact@xmtp.org
    url: https://community.xmtp.org
- name: XMTP App Chain RPC API
  description: JSON-RPC API for the XMTP Layer-3 appchain built on Arbitrum and settling to Base. Used for smart contract
    interactions including group management, identity updates, node registration, and fee payments in USDC. Compatible with
    standard Ethereum JSON-RPC tooling via providers like Alchemy. Chain ID 2020 with ETH as native currency.
  image: https://xmtp.org/img/xmtp-icon.png
  humanURL: https://www.alchemy.com/docs/reference/xmtp-api-quickstart
  baseURL: https://xmtp-mainnet.g.alchemy.com/v2
  tags:
  - JSON-RPC
  - Blockchain
  - Ethereum
  - Layer-3
  - Smart Contracts
  properties:
  - type: Documentation
    url: https://www.alchemy.com/docs/reference/xmtp-api-quickstart
  - type: GettingStarted
    url: https://www.alchemy.com/docs/reference/xmtp-api-quickstart
  - type: Plans
    url: https://xmtp.org/xmtp/plans.yml
  - type: RateLimits
    url: https://xmtp.org/xmtp/rate-limits.yml
  - type: FinOps
    url: https://xmtp.org/xmtp/finops.yml
  contact:
  - FN: XMTP Support
    email: contact@xmtp.org
    url: https://community.xmtp.org
common:
- type: Plans
  url: plans/plans.yml
- type: RateLimits
  url: rate-limits/rate-limits.yml
- type: FinOps
  url: finops/finops.yml
- type: Website
  url: https://www.xmtp.org/
- type: IssueTracker
  url: https://github.com/xmtp/xmtp-js/issues
- type: Releases
  url: https://github.com/xmtp/xmtp-js/releases
- type: CodeOfConduct
  url: https://github.com/xmtp/xmtp-js/blob/main/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/xmtp/xmtp-js/blob/main/CONTRIBUTING.md
- type: DomainSecurity
  url: security/xmtp-domain-security.yml
- type: GitHub
  url: https://github.com/xmtp
- type: Blog
  url: https://blog.xmtp.org
- type: Community
  url: https://community.xmtp.org
- type: Status
  url: https://status.xmtp.org
- type: ImprovementProposals
  url: https://github.com/xmtp/XIPs
- type: DecentralizationRoadmap
  url: https://xmtp.org/decentralization
- type: FeeCalculator
  url: https://docs.xmtp.org/fund-agents-apps/calculate-fees
- type: TermsOfService
  url: https://xmtp.org/terms
- type: PrivacyPolicy
  url: https://xmtp.org/privacy
- type: Contact
  url: https://community.xmtp.org
maintainers:
- FN: XMTP Labs
  email: contact@xmtp.org
  url: https://xmtp.org

XMTP API — frequently asked questions

Does XMTP have an API?

Yes. APIs.io lists 7 APIs from XMTP, including XMTP Network gRPC API, XMTP JavaScript/TypeScript SDK and XMTP Agent SDK, and 4 more.

Is there an OpenAPI specification for the XMTP API?

Yes. APIs.io indexes 1 OpenAPI specification for XMTP, each linked for download from this page.

How much does the XMTP API cost?

APIs.io lists 3 pricing plans for XMTP, with each plan's price, limits and inclusions under Pricing on this page.

Is the XMTP API ready for AI agents?

XMTP has a Kin Score of 27.2 out of 100 (thin) and an Agent Readiness score of 15.5 (agent-aware), scored by API Evangelist on 2026-11-06.

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