=nil; Foundation

=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. Read methods require no authentication; state changes are authorized by signed raw transactions.

GitHub

Documentation

📖
Documentation
https://docs.nil.foundation/nil/references/json-rpc-api/
📖
Authentication
https://raw.githubusercontent.com/api-evangelist/nil-foundation/refs/heads/main/authentication/nil-foundation-authentication.yml

Other Resources

🔗
Conventions
https://raw.githubusercontent.com/api-evangelist/nil-foundation/refs/heads/main/conventions/nil-foundation-conventions.yml
🔗
Idempotency
https://raw.githubusercontent.com/api-evangelist/nil-foundation/refs/heads/main/conventions/nil-foundation-conventions.yml
🔗
ErrorCatalog
https://raw.githubusercontent.com/api-evangelist/nil-foundation/refs/heads/main/errors/nil-foundation-error-codes.yml
🔗
Conformance
https://raw.githubusercontent.com/api-evangelist/nil-foundation/refs/heads/main/conformance/nil-foundation-conformance.yml
🔗
X-MCPServerCandidate
https://raw.githubusercontent.com/api-evangelist/nil-foundation/refs/heads/main/mcp/nil-foundation-mcp.yml
🔗
APIsJSON
https://raw.githubusercontent.com/api-evangelist/nil-foundation/refs/heads/main/apis.yml

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API entry from apis.yml

apis.yml Raw ↑ 
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: X-MCPServerCandidate
  url: mcp/nil-foundation-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate
    — a tool list derived from the published API contracts, not an existing server. The scorer already
    read the manifest and reported mcp_server correctly; the MCPServer type was crediting the artifact-type
    surfaces with a server that does not exist.'