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, Transaction, 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 23 more developer resources.

🌐 Visit website 📡 Source on GitHub

47.3/100 developing ▬ flat Agent 47/100 agent native Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0

AccessSelf serve

4 APIs 1 MCP Servers

BlockchainWeb3EthereumTransactionWalletsEVMInfrastructureSigningWebhookCryptography

Kin Score

Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0

Composite quality — 47.3/100 · developing

Contract Quality 13.2 / 21

Developer Ergonomics 11.6 / 17

Access Clarity 4.7 / 17

Operational Transparency 1.2 / 11

Contract Governance 1.7 / 10

Discoverability 6.9 / 9

Regulatory Posture 5.9 / 15

Agent readiness — 47/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

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 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

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.

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/.

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.

MCP Servers 1

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

Get Started 6

Portal, sign-up, and the first successful call

DeveloperPortal

GettingStarted

Quickstart

SignUp

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

MCPServer

LLMsTxt

WellKnown

AgentSkill

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conformance

ErrorCatalog

Lifecycle

Conventions

Idempotency

DataModel

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

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

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: '0.23'
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
- Transaction
- Wallets
- EVM
- Infrastructure
- Signing
- Webhook
- Cryptography
tags_raw:
- 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
  tags_raw:
  - 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:
  - Wallets
  tags_raw:
  - 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: Overlay
  url: overlays/syndicate-transaction-cloud-overlay.yaml
- 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

Syndicate

Kin Score

APIs 4

Syndicate api-key-manager > admin API

Syndicate call API

Syndicate transact API

Syndicate wallet API

Open Collections 5

API Collection

api-key-manager > admin API

api-key-manager > admin call API

api-key-manager > admin transact API

api-key-manager > admin wallet API

MCP Servers 1

Syndicate MCP Server

Event Specifications 1

Syndicate Webhooks

Security Posture 2

Syndicate Authentication

Syndicate Domain Security

Agentic Access 1

Syndicate Agentic Access

Resources