=nil; Foundation

=nil; Foundation is the developer of =nil;, an Ethereum Layer 2 blockchain powered by zkSharding that delivers horizontal scalability with built-in cross-shard communication and zero-knowledge proofs. On =nil; all accounts are smart contracts (no EOAs), state is partitioned across execution shards, and correctness is verified with zk proofs while Ethereum provides data availability and consensus. Developers build with Solidity smart contracts and interact with the cluster through an Ethereum-style JSON-RPC 2.0 API, the @nilfoundation/niljs TypeScript client library, the =nil; CLI, and a Hardhat plugin. =nil; Foundation also develops zkLLVM (a zero-knowledge proof circuit compiler) and the Placeholder proof system with an in-EVM verifier. The company is a portfolio company of Polychain Capital.

=nil; Foundation publishes 1 API on the APIs.io network. Tagged areas include Company, Zk Infrastructure, Blockchain, Layer 2, and Ethereum.

=nil; Foundation’s developer surface includes documentation, API reference, getting-started guide, engineering blog, CLI, authentication, changelog, and 15 more developer resources.

🌐 Visit website 📡 Source on GitHub
29.0/100 emerging ▬ flat Agent 38/100 agent aware Full breakdown ↓
scored 2026-07-27 · rubric v0.5
1 APIs 1 MCP Servers
CompanyZk InfrastructureBlockchainLayer 2EthereumZero Knowledge ProofszkShardingJSON-RPCSmart ContractsDeveloper Tools

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 29.0/100 · emerging
Contract Quality 0.0 / 25
Developer Ergonomics 13.9 / 20
Commercial Clarity 2.1 / 20
Operational Transparency 3.8 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 38/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 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 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/nil-foundation: 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 1

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

=nil; JSON-RPC API

Ethereum-style JSON-RPC 2.0 API exposing the =nil; cluster — blocks, transactions (messages), accounts, contract calls, gas pricing, shard enumeration, tokens, and event filters...

MCP Servers 1

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

nil-foundation-mcp.yml

MCP SERVER

Security Posture 2

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

Nil Foundation Authentication

none/signature · 2 schemes

SECURITY

Nil Foundation Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 LLMsTxt
LLMsTxt

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 Idempotency
Idempotency
 ErrorCatalog
ErrorCatalog
 Conformance
Conformance
 Lifecycle
Lifecycle

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 SDKs
SDKs
 Packages
Packages
 CLI
CLI

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 2

Status, limits, changes, and where to get help

Deprecation
Deprecation
 ChangeLog
ChangeLog

Commercial 1

Pricing, plans, and the legal terms of use

PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: nil-foundation
name: =nil; Foundation
description: =nil; Foundation is the developer of =nil;, an Ethereum Layer 2 blockchain powered by zkSharding that delivers
  horizontal scalability with built-in cross-shard communication and zero-knowledge proofs. On =nil; all accounts are smart
  contracts (no EOAs), state is partitioned across execution shards, and correctness is verified with zk proofs while Ethereum
  provides data availability and consensus. Developers build with Solidity smart contracts and interact with the cluster through
  an Ethereum-style JSON-RPC 2.0 API, the @nilfoundation/niljs TypeScript client library, the =nil; CLI, and a Hardhat plugin.
  =nil; Foundation also develops zkLLVM (a zero-knowledge proof circuit compiler) and the Placeholder proof system with an
  in-EVM verifier. The company is a portfolio company of Polychain Capital.
url: https://raw.githubusercontent.com/api-evangelist/nil-foundation/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- polychain
x-tier: stub
x-tier-reason: portfolio-lead
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
image: https://nil.foundation/favicon.ico
tags:
- Company
- Zk Infrastructure
- Blockchain
- Layer 2
- Ethereum
- Zero Knowledge Proofs
- zkSharding
- JSON-RPC
- Smart Contracts
- Developer Tools
apis:
- name: =nil; JSON-RPC API
  description: Ethereum-style JSON-RPC 2.0 API exposing the =nil; cluster — blocks, transactions (messages), accounts, contract
    calls, gas pricing, shard enumeration, tokens, and event filters. Read methods require no authentication; state changes
    are authorized by signed raw transactions.
  humanURL: https://docs.nil.foundation/nil/references/json-rpc-api/
  baseURL: https://api.devnet.nil.foundation
  tags:
  - JSON-RPC
  - Blockchain
  - Layer 2
  properties:
  - type: Documentation
    url: https://docs.nil.foundation/nil/references/json-rpc-api/
  - type: Authentication
    url: authentication/nil-foundation-authentication.yml
  - type: Conventions
    url: conventions/nil-foundation-conventions.yml
  - type: Idempotency
    url: conventions/nil-foundation-conventions.yml
  - type: ErrorCatalog
    url: errors/nil-foundation-error-codes.yml
  - type: Conformance
    url: conformance/nil-foundation-conformance.yml
  - type: MCPServer
    url: mcp/nil-foundation-mcp.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/nil-foundation-domain-security.yml
- type: Website
  url: https://nil.foundation
- type: DeveloperPortal
  url: https://docs.nil.foundation/
- type: Documentation
  url: https://docs.nil.foundation/
- type: APIReference
  url: https://docs.nil.foundation/nil/references/json-rpc-api/
- type: GettingStarted
  url: https://docs.nil.foundation/nil/getting-started/prerequisites/
- type: Blog
  url: https://nil.foundation/blog
- type: GitHubOrganization
  url: https://github.com/NilFoundation
- type: PrivacyPolicy
  url: https://nil.foundation/pages/privacy-policy
- type: SDKs
  url: packages/nil-foundation-packages.yml
- type: Packages
  url: packages/nil-foundation-packages.yml
- type: CLI
  url: cli/nil-foundation-cli.yml
- type: MCPServer
  url: mcp/nil-foundation-mcp.yml
- type: LLMsTxt
  url: llms/nil-foundation-llms.txt
- type: Authentication
  url: authentication/nil-foundation-authentication.yml
- type: Conventions
  url: conventions/nil-foundation-conventions.yml
- type: Idempotency
  url: conventions/nil-foundation-conventions.yml
- type: ErrorCatalog
  url: errors/nil-foundation-error-codes.yml
- type: Conformance
  url: conformance/nil-foundation-conformance.yml
- type: Lifecycle
  url: lifecycle/nil-foundation-lifecycle.yml
- type: Deprecation
  url: https://docs.nil.foundation/nil/migration-guides/
- type: ChangeLog
  url: changelog/nil-foundation-changelog.yml
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 11
  pass: local-v1