Ithaca

Ithaca is a crypto-infrastructure company (backed by Paradigm) building open-source developer tooling to accelerate the crypto frontier. Its flagship product, Porto, is a TypeScript SDK for passwordless authentication and payments on the web — letting applications and wallets create, manage, and interact with next-generation Ethereum accounts (keychains with passkeys, permissions, subscriptions, and native cross-chain interoperability) without passwords, extensions, seed phrases, or API keys. The stack also includes the Account smart contracts (Solidity), the Relay cross-chain transaction router and RPC server (Rust) for EIP-7702 accounts, and Odyssey, an experimental open-source Layer 2 testnet. The Ithaca team has since joined Tempo (tempo.xyz), and the Porto product is sunsetting on 2026-07-24 with users moving to porto.sh.

Ithaca is profiled on the APIs.io network. Tagged areas include Company, Crypto Infrastructure, Ethereum, Authentication, and Payments.

Ithaca’s developer surface includes documentation, getting-started guide, engineering blog, changelog, and 10 more developer resources.

🌐 Visit website 📡 Source on GitHub

19.4/100 emerging ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

CompanyCrypto InfrastructureEthereumAuthenticationPaymentsAccount AbstractionSmart ContractsWeb3SDKCross-Chain

Kin Score

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

Composite quality — 19.4/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 7.4 / 20

Commercial Clarity 0.0 / 20

Operational Transparency 4.1 / 13

Governance 0.0 / 12

Discoverability 6.8 / 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/ithaca: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

SDKs

SDKs

Packages

Packages

Access & Security 3

Authentication, authorization, and security posture

Security

Security

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

ChangeLog

ChangeLog

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: ithaca
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/ithaca.png
name: Ithaca
description: Ithaca is a crypto-infrastructure company (backed by Paradigm) building open-source developer tooling to accelerate
  the crypto frontier. Its flagship product, Porto, is a TypeScript SDK for passwordless authentication and payments on the
  web — letting applications and wallets create, manage, and interact with next-generation Ethereum accounts (keychains with
  passkeys, permissions, subscriptions, and native cross-chain interoperability) without passwords, extensions, seed phrases,
  or API keys. The stack also includes the Account smart contracts (Solidity), the Relay cross-chain transaction router and
  RPC server (Rust) for EIP-7702 accounts, and Odyssey, an experimental open-source Layer 2 testnet. The Ithaca team has since
  joined Tempo (tempo.xyz), and the Porto product is sunsetting on 2026-07-24 with users moving to porto.sh.
url: https://raw.githubusercontent.com/api-evangelist/ithaca/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- paradigm
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Crypto Infrastructure
- Ethereum
- Authentication
- Payments
- Account Abstraction
- Smart Contracts
- Web3
- SDK
- Cross-Chain
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.ithaca.xyz
- type: DeveloperPortal
  url: https://porto.sh
- type: Documentation
  url: https://porto.sh/sdk
- type: GettingStarted
  url: https://porto.sh/sdk
- type: Blog
  url: https://ithaca.xyz/updates
- type: ChangeLog
  url: https://porto.sh/changelog
- type: GitHubOrganization
  url: https://github.com/ithacaxyz
- type: SDKs
  url: packages/ithaca-packages.yml
- type: Packages
  url: packages/ithaca-packages.yml
- type: LLMsTxt
  url: llms/ithaca-llms.txt
- type: ChangeLog
  name: Changelog artifact
  url: changelog/ithaca-changelog.yml
- type: Security
  url: https://porto.sh/contracts/security-and-bug-bounty
- type: VulnerabilityDisclosure
  url: security/ithaca-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/ithaca-domain-security.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence