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

43.0/100 developing ▬ flat Agent 35/100 agent ready saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs 1 MCP Servers

Blockchain Web3 Ethereum Transaction Wallets EVM Infrastructure Signing Webhook Cryptography

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 43.0/100 · developing

Contract Quality 10.5 / 19

Developer Ergonomics 10.3 / 15

Access Clarity 4.1 / 15

Operational Transparency 1.0 / 10

Contract Governance 0.4 / 9

Discoverability 5.7 / 8

Regulatory Posture 5.9 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 35/100 · agent ready

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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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/. 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 github.com/api-evangelist/syndicate: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

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.

Open Collections 5

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

API Collection

OPEN COLLECTION

api-key-manager > admin API

OPEN COLLECTION

api-key-manager > admin call API

OPEN COLLECTION

api-key-manager > admin transact API

OPEN COLLECTION

api-key-manager > admin wallet API

OPEN COLLECTION

MCP Servers 1

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

Syndicate MCP Server

Official hosted MCP server published by Syndicate for AI client integration (Claude Code, Cursor, etc.). Serves the Syndicate documentation surface — including the Transaction C...

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

AGENTIC

Resources

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
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  - sandbox
  generated: '2026-09-03'
  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

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