ETHGas

ETHGas is an Ethereum blockspace exchange that turns Ethereum blockspace into a tradable commodity, enabling instant transactions through preconfirmations (execution and inclusion preconfs), whole-block commitments, and base-fee futures. Its public developer platform exposes a v1 REST API and a WebSocket streaming API for market data, order placement and management, funding (collateral deposits and withdrawals), and validator/builder registration. Authentication uses an EIP-712 wallet-signature login that issues a short-lived JWT bearer token; public market-data endpoints under /api/v1/p require none. ETHGas runs on Ethereum mainnet with a Hoodi testnet environment, and backs the exchange with a Commit-Boost validator module and a modified rbuilder block builder. ETHGas is backed by Polychain.

ETHGas publishes 1 API on the APIs.io network. Tagged areas include Company, Infrastructure, Blockchain, Ethereum, and Trading.

The ETHGas catalog on APIs.io includes 1 event-driven AsyncAPI specification.

ETHGas’ developer surface includes documentation, API reference, getting-started guide, engineering blog, support, signup flow, authentication, and 17 more developer resources.

🌐 Visit website 📡 Source on GitHub

41.3/100 thin ▬ flat Agent 39/100 agent aware Full breakdown ↓
scored 2026-07-27 · rubric v0.5

AccessSelf serve

1 APIs 1 MCP Servers

CompanyInfrastructureBlockchainEthereumTradingPreconfirmationsBlockspaceMEVDeFiWeb3

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 41.3/100 · thin

Contract Quality 5.7 / 25

Developer Ergonomics 13.5 / 20

Commercial Clarity 6.8 / 20

Operational Transparency 3.8 / 13

Governance 0.0 / 12

Discoverability 9.3 / 10

Agent readiness — 39/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 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/ethgas: 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.

ETHGas API

ETHGas v1 REST + WebSocket API for market data, order placement/management, funding (collateral deposits/withdrawals), and validator/builder operations across whole-block commit...

MCP Servers 1

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

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

GettingStarted

SignUp

Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

MCPServer

MCPServer

WellKnown

WellKnown

LLMsTxt

LLMsTxt

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Webhooks

Conformance

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Support

Support

ChangeLog

ChangeLog

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: ethgas
name: ETHGas
description: ETHGas is an Ethereum blockspace exchange that turns Ethereum blockspace into a tradable commodity, enabling
  instant transactions through preconfirmations (execution and inclusion preconfs), whole-block commitments, and base-fee
  futures. Its public developer platform exposes a v1 REST API and a WebSocket streaming API for market data, order placement
  and management, funding (collateral deposits and withdrawals), and validator/builder registration. Authentication uses an
  EIP-712 wallet-signature login that issues a short-lived JWT bearer token; public market-data endpoints under /api/v1/p
  require none. ETHGas runs on Ethereum mainnet with a Hoodi testnet environment, and backs the exchange with a Commit-Boost
  validator module and a modified rbuilder block builder. ETHGas is backed by Polychain.
url: https://raw.githubusercontent.com/api-evangelist/ethgas/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: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
image: https://ethgas.com/favicon.ico
tags:
- Company
- Infrastructure
- Blockchain
- Ethereum
- Trading
- Preconfirmations
- Blockspace
- MEV
- DeFi
- Web3
apis:
- name: ETHGas API
  description: ETHGas v1 REST + WebSocket API for market data, order placement/management, funding (collateral deposits/withdrawals),
    and validator/builder operations across whole-block commitments and inclusion preconfirmations.
  humanURL: https://developers.ethgas.com
  baseURL: https://mainnet.app.ethgas.com
  tags:
  - Trading
  - Ethereum
  - Preconfirmations
  - Blockspace
  properties:
  - type: Authentication
    url: authentication/ethgas-authentication.yml
  - type: Conventions
    url: conventions/ethgas-conventions.yml
  - type: ErrorCatalog
    url: errors/ethgas-error-codes.yml
  - type: Lifecycle
    url: lifecycle/ethgas-lifecycle.yml
  - type: ChangeLog
    url: changelog/ethgas-changelog.yml
  - type: Sandbox
    url: sandbox/ethgas-sandbox.yml
  - type: Webhooks
    url: asyncapi/ethgas-websocket-webhooks.yml
  - type: MCPServer
    url: mcp/ethgas-mcp.yml
  - type: Conformance
    url: conformance/ethgas-conformance.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://ethgas.com
- type: DeveloperPortal
  url: https://developers.ethgas.com
- type: Documentation
  url: https://docs.ethgas.com
- type: APIReference
  url: https://developers.ethgas.com
- type: GettingStarted
  url: https://docs.ethgas.com/developer-resources/technical-integration
- type: Blog
  url: https://ethgas.com/blog
- type: GitHubOrganization
  url: https://github.com/ethgas-developer
- type: Support
  url: https://discord.gg/ethgas
- type: SignUp
  url: https://app.ethgas.com
- type: TermsOfService
  url: https://ethgas.com/terms-of-service
- type: PrivacyPolicy
  url: https://ethgas.com/privacy-policy
- type: Authentication
  url: authentication/ethgas-authentication.yml
- type: Conventions
  url: conventions/ethgas-conventions.yml
- type: ErrorCatalog
  url: errors/ethgas-error-codes.yml
- type: Lifecycle
  url: lifecycle/ethgas-lifecycle.yml
- type: ChangeLog
  url: changelog/ethgas-changelog.yml
- type: Sandbox
  url: sandbox/ethgas-sandbox.yml
- type: Webhooks
  url: asyncapi/ethgas-websocket-webhooks.yml
- type: MCPServer
  url: mcp/ethgas-mcp.yml
- type: Conformance
  url: conformance/ethgas-conformance.yml
- type: Packages
  url: packages/ethgas-packages.yml
- type: WellKnown
  url: well-known/ethgas-well-known.yml
- type: LLMsTxt
  url: llms/ethgas-llms.txt
- type: DomainSecurity
  url: security/ethgas-domain-security.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

ETHGas

Kin Score

APIs 1

ETHGas API

MCP Servers 1

ethgas-mcp.yml

Event Specifications 1

Ethgas Websocket Webhooks

Security Posture 2

Ethgas Authentication

Ethgas Domain Security

Resources