Sound.xyz

Sound.xyz was a web3 music platform and suite of on-chain tools that let artists release music as digital collectibles and host listening parties for new releases, building direct economic relationships with their communities. The consumer platform went offline on 2026-01-16 (with a successor project, Vault.fm), but Sound.xyz's first-party developer surface remains publicly published: the open-source Sound protocol (a permissionless Solidity smart-contract framework for music collectibles) and the official @soundxyz npm SDK ecosystem (@soundxyz/sdk, sdk-viem, legacy-sdk) for on-chain development, alongside GraphQL and caching infrastructure libraries. Added to the API Evangelist network as an a16z portfolio company; this profile now reflects the enrichment pipeline's findings.

Sound.xyz is profiled on the APIs.io network. Tagged areas include Company, Music, Web3, Blockchain, and NFT.

Sound.xyz’s developer surface includes documentation and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

11.3/100 emerging ▬ flat Agent 0/100 human only self hosted · MIT Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

0 APIs

Company Music Web3 Blockchain NFT Smart Contracts Creator Economy SDK Ethereum Digital Collectibles

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 11.3/100 · emerging

Contract Quality 0.0 / 23

Developer Ergonomics 2.1 / 18

Access Clarity 0.0 / 18

Operational Transparency 2.2 / 12

Contract Governance 0.0 / 11

Discoverability 4.5 / 9

Open Source Surface 2.5 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

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

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 90 points between them, because the conditional facet above carries the other 10. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 90% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/soundxyz: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Security Posture 1

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

Soundxyz Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

SourceCode

Packages

SDKs

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

IssueTracker

IssueTracker

Releases

Releases

Commercial 1

Pricing, plans, and the legal terms of use

License

License

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: soundxyz
name: Sound.xyz
description: 'Sound.xyz was a web3 music platform and suite of on-chain tools that let artists release music as digital collectibles
  and host listening parties for new releases, building direct economic relationships with their communities. The consumer
  platform went offline on 2026-01-16 (with a successor project, Vault.fm), but Sound.xyz''s first-party developer surface
  remains publicly published: the open-source Sound protocol (a permissionless Solidity smart-contract framework for music
  collectibles) and the official @soundxyz npm SDK ecosystem (@soundxyz/sdk, sdk-viem, legacy-sdk) for on-chain development,
  alongside GraphQL and caching infrastructure libraries. Added to the API Evangelist network as an a16z portfolio company;
  this profile now reflects the enrichment pipeline''s findings.'
deliveryModel:
  model: self-hosted
  license: MIT
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  generated: '2026-08-28'
  method: derived
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://avatars.githubusercontent.com/u/87795154?s=200&v=4
url: https://raw.githubusercontent.com/api-evangelist/soundxyz/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
x-tier: stub
x-tier-reason: portfolio-lead
x-status: platform-offline
x-status-note: Consumer platform and hosted GraphQL API (api.sound.xyz) went offline 2026-01-16; docs.sound.xyz returns HTTP
  402. On-chain protocol and npm SDKs remain published.
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Music
- Web3
- Blockchain
- NFT
- Smart Contracts
- Creator Economy
- SDK
- Ethereum
- Digital Collectibles
apis: []
common:
- type: IssueTracker
  url: https://github.com/soundxyz/sound-protocol/issues
- type: Releases
  url: https://github.com/soundxyz/sound-protocol/releases
- type: License
  name: MIT
  url: https://github.com/soundxyz/sound-protocol/blob/main/LICENSE
- type: GitHubOrganization
  url: https://github.com/soundxyz
- type: Website
  url: https://www.sound.xyz
- type: Documentation
  url: https://docs.sound.xyz
- type: SourceCode
  url: https://github.com/soundxyz/sound-protocol
- type: Packages
  url: packages/soundxyz-packages.yml
- type: SDKs
  url: packages/soundxyz-packages.yml
- type: DomainSecurity
  url: security/soundxyz-domain-security.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 2
  pass: local-v1

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