Syndicate

Syndicate is a web3 Transaction Cloud that abstracts blockchain transaction infrastructure for developers. Its REST APIs let teams broadcast transactions across EVM-compatible chains without managing private keys, nonces, or gas — with wallets and private keys secured inside HSM enclaves, guaranteed idempotency, managed gas, EIP-191 personal signing and EIP-712 typed-data signing and attestations, contract and function-signature authorization, IP allowlisting, and reliability-focused signed webhooks for real-time transaction status updates. Syndicate is backed by a16z crypto and ships an official Node.js SDK and a hosted MCP server for AI agents.

Syndicate publishes 4 APIs on the APIs.io network, including api-key-manager > admin API, call API, transact API, and 1 more. Tagged areas include Blockchain, Web3, Ethereum, Transactions, and Wallets.

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

Syndicate’s developer surface includes documentation, API reference, getting-started guide, quickstart, engineering blog, signup flow, authentication, and 22 more developer resources.

🌐 Visit website 📡 Source on GitHub
49.7/100 developing ▬ flat Agent 84/100 agent native Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessSelf serve
4 APIs 1 MCP Servers
BlockchainWeb3EthereumTransactionsWalletsEVMInfrastructureSigningWebhooksCryptography

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 49.7/100 · developing
Contract Quality 15.9 / 25
Developer Ergonomics 15.2 / 20
Commercial Clarity 6.8 / 20
Operational Transparency 1.7 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 84/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 15 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 9 / 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 4 / 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/syndicate: 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 4

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

Syndicate api-key-manager > admin API

The api-key-manager > admin API from Syndicate — 11 operation(s) for api-key-manager > admin.

Syndicate call API

The call API from Syndicate — 1 operation(s) for call.

Syndicate transact API

The transact API from Syndicate — 1 operation(s) for transact.

Syndicate wallet API

The wallet API from Syndicate — 11 operation(s) for wallet.

MCP Servers 1

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

syndicate-mcp.yml

MCP SERVER

Event Specifications 1

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

Syndicate Webhooks

ASYNCAPI

Security Posture 2

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

Syndicate Authentication

http · 1 scheme

SECURITY

Syndicate Domain Security

TLSv1.2 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Syndicate Agentic Access

24 operations · 14 acting

24 operations · 14 acting

AGENTIC

Resources

Get Started 6

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 Quickstart
Quickstart
 SignUp
SignUp
 Login
Login
 Sandbox
Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 MCPServer
MCPServer
 LLMsTxt
LLMsTxt
 WellKnown
WellKnown
 AgentSkill
AgentSkill

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

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

Scroll for all 7

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

DomainSecurity
DomainSecurity
 Authentication
Authentication

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Blog
Blog
 Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: syndicate
name: Syndicate
description: Syndicate is a web3 Transaction Cloud that abstracts blockchain transaction infrastructure for developers. Its
  REST APIs let teams broadcast transactions across EVM-compatible chains without managing private keys, nonces, or gas —
  with wallets and private keys secured inside HSM enclaves, guaranteed idempotency, managed gas, EIP-191 personal signing
  and EIP-712 typed-data signing and attestations, contract and function-signature authorization, IP allowlisting, and reliability-focused
  signed webhooks for real-time transaction status updates. Syndicate is backed by a16z crypto and ships an official Node.js
  SDK and a hosted MCP server for AI agents.
url: https://raw.githubusercontent.com/api-evangelist/syndicate/refs/heads/main/apis.yml
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://avatars.githubusercontent.com/u/76978866?s=200&v=4
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
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: 21
  pass: local-v1
tags:
- Blockchain
- Web3
- Ethereum
- Transactions
- Wallets
- EVM
- Infrastructure
- Signing
- Webhooks
- Cryptography
apis:
- aid: syndicate:syndicate-api-key-manager-admin-api
  name: Syndicate api-key-manager > admin API
  description: The api-key-manager > admin API from Syndicate — 11 operation(s) for api-key-manager > admin.
  humanURL: https://tc.docs.syndicate.io/infrastructure/overview
  baseURL: https://api.syndicate.io
  tags:
  - api-key-manager > admin
  properties:
  - type: OpenAPI
    url: openapi/syndicate-api-key-manager-admin-api-openapi.yml
  - type: Documentation
    url: https://tc.docs.syndicate.io/infrastructure/overview
- aid: syndicate:syndicate-call-api
  name: Syndicate call API
  description: The call API from Syndicate — 1 operation(s) for call.
  humanURL: https://tc.docs.syndicate.io/infrastructure/overview
  baseURL: https://api.syndicate.io
  tags:
  - call
  properties:
  - type: OpenAPI
    url: openapi/syndicate-call-api-openapi.yml
  - type: Documentation
    url: https://tc.docs.syndicate.io/infrastructure/overview
- aid: syndicate:syndicate-transact-api
  name: Syndicate transact API
  description: The transact API from Syndicate — 1 operation(s) for transact.
  humanURL: https://tc.docs.syndicate.io/infrastructure/overview
  baseURL: https://api.syndicate.io
  tags:
  - transact
  properties:
  - type: OpenAPI
    url: openapi/syndicate-transact-api-openapi.yml
  - type: Documentation
    url: https://tc.docs.syndicate.io/infrastructure/overview
- aid: syndicate:syndicate-wallet-api
  name: Syndicate wallet API
  description: The wallet API from Syndicate — 11 operation(s) for wallet.
  humanURL: https://tc.docs.syndicate.io/infrastructure/overview
  baseURL: https://api.syndicate.io
  tags:
  - wallet
  properties:
  - type: OpenAPI
    url: openapi/syndicate-wallet-api-openapi.yml
  - type: Documentation
    url: https://tc.docs.syndicate.io/infrastructure/overview
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/syndicate-domain-security.yml
- type: DeveloperPortal
  url: https://docs.syndicate.io
- type: Documentation
  url: https://tc.docs.syndicate.io
- type: APIReference
  url: https://tc.docs.syndicate.io/api/transactions/send-transaction
- type: GettingStarted
  url: https://tc.docs.syndicate.io/get-started/quickstart
- type: Quickstart
  url: https://tc.docs.syndicate.io/get-started/quickstart
- type: Blog
  url: https://syndicate.io/blog
- type: GitHubOrganization
  url: https://github.com/SyndicateProtocol
- type: SignUp
  url: https://dashboard.syndicate.io/signup
- type: Login
  url: https://dashboard.syndicate.io
- type: TermsOfService
  url: https://syndicate.io/terms
- type: PrivacyPolicy
  url: https://syndicate.io/privacy-policy
- type: Website
  url: https://syndicate.io
- type: AgenticAccess
  url: agentic-access/syndicate-agentic-access.yml
- type: Authentication
  url: authentication/syndicate-authentication.yml
- type: Packages
  url: packages/syndicate-packages.yml
- type: SDKs
  url: packages/syndicate-packages.yml
- type: MCPServer
  url: mcp/syndicate-mcp.yml
- type: LLMsTxt
  url: llms/syndicate-llms.txt
- type: WellKnown
  url: well-known/syndicate-well-known.yml
- type: Conformance
  url: conformance/syndicate-conformance.yml
- type: ErrorCatalog
  url: errors/syndicate-problem-types.yml
- type: Lifecycle
  url: lifecycle/syndicate-lifecycle.yml
- type: Conventions
  url: conventions/syndicate-conventions.yml
- type: Idempotency
  url: conventions/syndicate-conventions.yml
- type: Sandbox
  url: sandbox/syndicate-sandbox.yml
- type: DataModel
  url: data-model/syndicate-data-model.yml
- type: Webhooks
  url: asyncapi/syndicate-webhooks.yml
- type: AgentSkill
  url: skills/_index.yml