Seltz

Seltz is a San Francisco-based AI infrastructure company building the web retrieval and knowledge layer for the agentic internet. Its Web Knowledge API gives LLMs, RAG pipelines, and autonomous agents real-time, context-engineered web data through a single call: POST /v1/search returns ranked, cleaned source documents, POST /v1/answer returns a direct RAG answer with citations, and an OpenAI-compatible /v1/chat/completions endpoint serves web-grounded chat. Rather than returning raw snippets like a traditional search API, Seltz shapes web content to maximize usefulness for machine reasoning. Founded in 2025 by Antonio Mallia (Amazon, Pinecone) and backed by Speedinvest and B Capital, Seltz ships official Python and TypeScript SDKs, a hosted MCP server, and integrations for OpenAI, Anthropic, Mistral, LlamaIndex, Agno, Langroid, Dify, n8n, and Zapier.

Seltz publishes 2 APIs on the APIs.io network: answer API and search API. Tagged areas include Company, Web Search, AI Infrastructure, Retrieval, and RAG.

Seltz’s developer surface includes documentation, API reference, getting-started guide, sandbox, pricing, signup flow, engineering blog, and 17 more developer resources.

🌐 Visit website 📡 Source on GitHub

51.1/100 developing ▬ flat Agent 38/100 agent aware Full breakdown ↓
scored 2026-07-27 · rubric v0.5

AccessSelf serve

2 APIs 1 MCP Servers

CompanyWeb SearchAI InfrastructureRetrievalRAGAgentsLLMKnowledge APIDeveloper ToolsMCP

Kin Score

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

Composite quality — 51.1/100 · developing

Contract Quality 13.1 / 25

Developer Ergonomics 13.9 / 20

Commercial Clarity 12.1 / 20

Operational Transparency 2.7 / 13

Governance 0.0 / 12

Discoverability 9.3 / 10

Agent readiness — 38/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 15

MCP Server 12 / 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 5 / 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/seltz: 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 2

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

Seltz answer API

Answer operations

Seltz search API

Search operations

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

Sandbox

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

MCPServer

LLMsTxt

WellKnown

AgentSkill

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

Lifecycle

Lifecycle

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

SDKs

SDKs

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Compliance

Compliance

TrustCenter

TrustCenter

Operate 2

Status, limits, changes, and where to get help

Support

Support

ChangeLog

ChangeLog

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Blog

Blog

Source (apis.yml)

aid: seltz
name: Seltz
description: 'Seltz is a San Francisco-based AI infrastructure company building the web retrieval and knowledge layer for
  the agentic internet. Its Web Knowledge API gives LLMs, RAG pipelines, and autonomous agents real-time, context-engineered
  web data through a single call: POST /v1/search returns ranked, cleaned source documents, POST /v1/answer returns a direct
  RAG answer with citations, and an OpenAI-compatible /v1/chat/completions endpoint serves web-grounded chat. Rather than
  returning raw snippets like a traditional search API, Seltz shapes web content to maximize usefulness for machine reasoning.
  Founded in 2025 by Antonio Mallia (Amazon, Pinecone) and backed by Speedinvest and B Capital, Seltz ships official Python
  and TypeScript SDKs, a hosted MCP server, and integrations for OpenAI, Anthropic, Mistral, LlamaIndex, Agno, Langroid, Dify,
  n8n, and Zapier.'
url: https://raw.githubusercontent.com/api-evangelist/seltz/refs/heads/main/apis.yml
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
image: https://seltz.ai/favicon.ico
x-type: company
x-source: vc-portfolio
x-backed-by:
- speedinvest
- b-capital
x-tier: profiled
x-tier-reason: has-public-api
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Web Search
- AI Infrastructure
- Retrieval
- RAG
- Agents
- LLM
- Knowledge API
- Developer Tools
- MCP
apis:
- aid: seltz:seltz-answer-api
  name: Seltz answer API
  description: Answer operations
  humanURL: https://docs.seltz.ai
  baseURL: https://api.seltz.ai
  tags:
  - answer
  properties:
  - type: OpenAPI
    url: openapi/seltz-answer-api-openapi.yml
  - type: Documentation
    url: https://docs.seltz.ai
  - type: APIReference
    url: https://docs.seltz.ai/api-reference/introduction
  - type: Authentication
    url: authentication/seltz-authentication.yml
  - type: ErrorCatalog
    url: errors/seltz-problem-types.yml
  - type: Conventions
    url: conventions/seltz-conventions.yml
  - type: DataModel
    url: data-model/seltz-data-model.yml
- aid: seltz:seltz-search-api
  name: Seltz search API
  description: Search operations
  humanURL: https://docs.seltz.ai
  baseURL: https://api.seltz.ai
  tags:
  - search
  properties:
  - type: OpenAPI
    url: openapi/seltz-search-api-openapi.yml
  - type: Documentation
    url: https://docs.seltz.ai
  - type: APIReference
    url: https://docs.seltz.ai/api-reference/introduction
  - type: Authentication
    url: authentication/seltz-authentication.yml
  - type: ErrorCatalog
    url: errors/seltz-problem-types.yml
  - type: Conventions
    url: conventions/seltz-conventions.yml
  - type: DataModel
    url: data-model/seltz-data-model.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/seltz-domain-security.yml
- type: DeveloperPortal
  url: https://console.seltz.ai
- type: Documentation
  url: https://docs.seltz.ai
- type: APIReference
  url: https://docs.seltz.ai/api-reference/introduction
- type: GettingStarted
  url: https://docs.seltz.ai/quickstart
- type: Sandbox
  url: https://console.seltz.ai/playground
- type: Pricing
  url: https://seltz.ai/pricing
- type: SignUp
  url: https://console.seltz.ai
- type: TermsOfService
  url: https://seltz.ai/terms
- type: PrivacyPolicy
  url: https://seltz.ai/privacy-policy
- type: Blog
  url: https://seltz.ai/blog
- type: Support
  url: https://seltz.ai/contact
- type: GitHubOrganization
  url: https://github.com/seltz-ai
- type: Packages
  url: packages/seltz-packages.yml
- type: SDKs
  url: packages/seltz-packages.yml
- type: MCPServer
  url: mcp/seltz-mcp.yml
- type: LLMsTxt
  url: llms/seltz-llms.txt
- type: WellKnown
  url: well-known/seltz-well-known.yml
- type: Conformance
  url: conformance/seltz-conformance.yml
- type: Compliance
  url: https://trust.seltz.ai/
- type: TrustCenter
  url: security/seltz-trust-center.yml
- type: Lifecycle
  url: lifecycle/seltz-lifecycle.yml
- type: ChangeLog
  url: changelog/seltz-changelog.yml
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 18
  pass: local-v1