Cypherium

Cypherium is a permissionless Layer-1 blockchain built to bridge centralized (CeFi) and decentralized (DeFi) finance and bring real-world assets on-chain at scale. It runs CypherBFT, a hybrid consensus that pairs GPU proof-of-work committee election with HotStuff Byzantine Fault Tolerance for near-instant finality, and is EVM/Solidity compatible (EVM chain ID 16166). Products include CypherLink (cross-ledger notary), Cypherium Connect (bank integration plugin, marketed as ISO 20022 compliant), the Cypherium Validator, and Cypherium ID (decentralized identity). Developers integrate through an Ethereum-style JSON-RPC node API (eth/web3/net/ personal/miner/txpool/admin namespaces over HTTP, WS and IPC) and a Coinbase Rosetta API implementation for exchange and wallet integration. Surfaced as a portfolio company of Pantera Capital and enriched into the API Evangelist network.

Cypherium publishes 2 APIs on the APIs.io network. Tagged areas include Company, Crypto, Blockchain, Layer 1, and JSON-RPC.

Cypherium’s developer surface includes documentation, engineering blog, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

12.9/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-21 · rubric v0.4

2 APIs 0 Features

CompanyCryptoBlockchainLayer 1JSON-RPCEVMDeFiRosettaConsensus

API Rating

API Evangelist Rating How this is scored →
scored 2026-07-21 · rubric v0.4

Composite quality — 12.9/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 3.5 / 20

Commercial Clarity 0.0 / 20

Operational Transparency 0.7 / 13

Governance 0.0 / 12

Discoverability 8.8 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

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 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 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/cypherium: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

SDKs

SDKs

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: cypherium
name: Cypherium
description: Cypherium is a permissionless Layer-1 blockchain built to bridge centralized (CeFi) and decentralized (DeFi)
  finance and bring real-world assets on-chain at scale. It runs CypherBFT, a hybrid consensus that pairs GPU proof-of-work
  committee election with HotStuff Byzantine Fault Tolerance for near-instant finality, and is EVM/Solidity compatible (EVM
  chain ID 16166). Products include CypherLink (cross-ledger notary), Cypherium Connect (bank integration plugin, marketed
  as ISO 20022 compliant), the Cypherium Validator, and Cypherium ID (decentralized identity). Developers integrate through
  an Ethereum-style JSON-RPC node API (eth/web3/net/ personal/miner/txpool/admin namespaces over HTTP, WS and IPC) and a Coinbase
  Rosetta API implementation for exchange and wallet integration. Surfaced as a portfolio company of Pantera Capital and enriched
  into the API Evangelist network.
url: https://raw.githubusercontent.com/api-evangelist/cypherium/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- pantera-capital
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Crypto
- Blockchain
- Layer 1
- JSON-RPC
- EVM
- DeFi
- Rosetta
- Consensus
apis:
- name: Cypherium JSON-RPC API
  description: Ethereum-compatible JSON-RPC node API for the Cypherium Layer-1 mainnet — eth, web3, net, personal, miner,
    txpool and admin namespaces over HTTP, WebSocket and IPC. EVM chain ID 16166, native currency CPH.
  humanURL: https://github.com/cypherium/cypher
  baseURL: https://pubnodes.cypherium.io/rpc
  tags:
  - JSON-RPC
  - EVM
  - Blockchain
  properties:
  - type: Documentation
    url: https://github.com/cypherium/cypher
  - type: BlockExplorer
    url: https://cypherium.tryethernal.com/
- name: Rosetta Cypherium API
  description: Coinbase Rosetta API (Data + Construction) reference implementation for Cypherium, enabling standardized blockchain
    data access and stateless offline transaction construction for exchanges and wallets.
  humanURL: https://github.com/cypherium/rosetta-cypherium
  baseURL: https://github.com/cypherium/rosetta-cypherium
  tags:
  - Rosetta
  - Blockchain
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.cypherium.io/
- type: GitHubOrganization
  url: https://github.com/cypherium
- type: Documentation
  url: https://github.com/cypherium/cypher
- type: Blog
  url: https://www.cypherium.io/blog
- type: Packages
  url: packages/cypherium-packages.yml
- type: SDKs
  url: packages/cypherium-packages.yml
- type: Conformance
  url: conformance/cypherium-conformance.yml
- type: DomainSecurity
  url: security/cypherium-domain-security.yml
- type: LLMsTxt
  url: llms/cypherium-llms.txt
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

Cypherium

API Rating

APIs

Cypherium JSON-RPC API

Rosetta Cypherium API

Resources