iwant.fyi

iwant.fyi is a demand-side commerce service and reverse marketplace for AI agents: buyers (or agents acting for them) post structured purchase intent — a "Want" with budget, condition floor, location and per-vertical specs — and receive supply ranked across native sellers, Shopify, Klarna and live dealer inventory in one call, with the constraints enforced rather than treated as keywords. It is the reference implementation of the open, Apache-2.0 iwant.fyi demand-side protocol (v1.1), reachable over a hosted MCP server, an A2A endpoint that needs no key, a JSON HTTP fallback under /api/v1 and a legacy REST marketplace API, with six official SDKs, signed standing-want webhooks, published JSON Schemas and a conformance kit.

iwant.fyi publishes 6 API contracts indexed on the APIs.io network, including Agents API, MCP API, Wants API, and 3 more. Tagged areas include Agentic Commerce, Marketplace, AI Agents, Purchase Intent, and Shopping.

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

iwant.fyi’s developer surface includes pricing, documentation, API reference, getting-started guide, support, engineering blog, signup flow, and 27 more developer resources.

🌐 Visit website 📡 Source on GitHub
60.6/100 strong ▬ flat Agent 43/100 agent ready Front door AI 4/6 moderate Full breakdown ↓
scored 2026-10-09 · rubric v0.23.0
4 published contracts 1 MCP Servers
Agentic CommerceMarketplaceAI AgentsPurchase IntentShoppingAutomotiveMCPA2AOpen Protocolx402Agent-Native

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-09 · rubric v0.23.0
Composite quality — 60.6/100 · strong
Contract Quality 11.2 / 19
Developer Ergonomics 11.8 / 15
Access Clarity 9.9 / 15
Operational Transparency 3.6 / 10
Contract Governance 1.6 / 9
Discoverability 6.0 / 8
Regulatory Posture 4.9 / 15
Create-or-Update Ergonomics 0.0 / 10
Agent readiness — 43/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 9 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 6 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 8 / 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
Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.
Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.
The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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/iwant-fyi: 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 →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

x402
tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

APIs 6

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

iwant.fyi Demand-Side Protocol HTTP Fallback

The canonical protocol surface for agents that do not speak MCP — POST /wants, GET /wants/{id}, POST /search, POST /outcomes, GET /verticals, GET /constraints, GET /health, GET ...

iwant.fyi MCP Server

Hosted streamable-HTTP Model Context Protocol server at https://iwant.fyi/api/mcp (protocol 2025-06-18). initialize and tools/list are public, and ten demand.* tools — search, f...

iwant.fyi A2A Agent

Agent-to-Agent endpoint at https://iwant.fyi/api/a2a (JSON-RPC message/send and tasks/get) that needs no key: send plain text describing what the user wants and receive ranked m...

iwant.fyi Agents API

The Agents API from iwant.fyi — 2 operation(s) for agents.

iwant.fyi MCP API

The Mcp API from iwant.fyi — 1 operation(s) for mcp.

iwant.fyi Wants API

The Wants API from iwant.fyi — 2 operation(s) for wants.

MCP Servers 1

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

iwant.fyi MCP Server

Remote MCP server at iwant.fyi over HTTP requiring an API key; 26 tools listed.

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Iwant Fyi Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Iwant Fyi Rate Limits

0 limits

RATE LIMITS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Iwant Fyi Webhooks

ASYNCAPI

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Iwant Fyi Openapi Overlay

13 actions · documentation · iwant-fyi-openapi.yml

GENERATED

JSON Schema 4

Standalone JSON Schema definitions for this provider's data models.

MatchResponse

8 properties

JSON SCHEMA

Match

19 properties

JSON SCHEMA

OutcomeEvent

7 properties

JSON SCHEMA

Want

16 properties

JSON SCHEMA

Security Posture 2

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

Iwant Fyi Authentication

http/none · 3 schemes

SECURITY

Iwant Fyi Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Iwant Fyi Agentic Access

8 operations · 4 acting

8 operations · 4 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
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

LLMsTxt
LLMsTxt
 WellKnown
WellKnown
 AgentSkill
AgentSkill
 AgenticAccess
AgenticAccess

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Lifecycle
Lifecycle

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs
 CLI
CLI

Access & Security 2

Authentication, authorization, and security posture

Authentication
Authentication
 DomainSecurity
DomainSecurity

Operate 4

Status, limits, changes, and where to get help

RateLimits
RateLimits
 Support
Support
 Deprecation
Deprecation
 ChangeLog
ChangeLog

Commercial 4

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy
 Plans
Plans

Company 3

The organization behind the API

Website
Website
 Blog
Blog
 About
About

Other 7

Properties that don't map to a standard resource type

Overlay
Overlay
 RSS
RSS
 AgentCard
AgentCard
 RegulatoryPosture
RegulatoryPosture
 DataSubjectRequest
DataSubjectRequest
 Subprocessors
Subprocessors
 AITransparency
AITransparency

Scroll for all 7

Source (apis.yml)

apis.yml Raw ↑ 
aid: iwant-fyi
name: iwant.fyi
description: 'iwant.fyi is a demand-side commerce service and reverse marketplace for AI agents: buyers (or agents acting
  for them) post structured purchase intent — a "Want" with budget, condition floor, location and per-vertical specs — and
  receive supply ranked across native sellers, Shopify, Klarna and live dealer inventory in one call, with the constraints
  enforced rather than treated as keywords. It is the reference implementation of the open, Apache-2.0 iwant.fyi demand-side
  protocol (v1.1), reachable over a hosted MCP server, an A2A endpoint that needs no key, a JSON HTTP fallback under /api/v1
  and a legacy REST marketplace API, with six official SDKs, signed standing-want webhooks, published JSON Schemas and a conformance
  kit.'
image: https://iwant.fyi/opengraph-image?b7ff8bf143b78fce
url: https://raw.githubusercontent.com/api-evangelist/iwant-fyi/refs/heads/main/apis.yml
x-type: company
x-source: harvest:a2a-registry
x-tier: enriched
x-tier-reason: enrichment pipeline local-v3 2026-09-19
specificationVersion: '0.20'
created: '2026-09-19'
modified: '2026-09-19'
tags:
- Agentic Commerce
- Marketplace
- AI Agents
- Purchase Intent
- Shopping
- Automotive
- MCP
- A2A
- Open Protocol
- x402
- Agent-Native
tags_raw:
- Agentic Commerce
- Marketplace
- AI Agents
- Purchase Intent
- Shopping
- Automotive
- MCP
- A2A
- Open Protocol
- x402
- agent-native
apis:
- name: iwant.fyi Demand-Side Protocol HTTP Fallback
  description: The canonical protocol surface for agents that do not speak MCP — POST /wants, GET /wants/{id}, POST /search,
    POST /outcomes, GET /verticals, GET /constraints, GET /health, GET /capabilities, GET /conformance and the /watches* and
    /supply* endpoints under https://iwant.fyi/api/v1 — mirroring the demand.* MCP tools per spec section 9. Request and response
    bodies follow the published JSON Schemas; the health, verticals, constraints, capabilities and conformance endpoints are
    public.
  humanURL: https://iwant.fyi/protocol/v1
  baseURL: https://iwant.fyi/api/v1
  tags:
  - Purchase Intent
  - Matching
  - Webhook
  tags_raw:
  - Purchase Intent
  - Matching
  - Webhooks
  properties:
  - type: APIReference
    url: https://iwant.fyi/protocol/v1
  - type: JSONSchema
    url: json-schema/iwant-fyi-want.json
  - type: JSONSchema
    url: json-schema/iwant-fyi-match.json
  - type: JSONSchema
    url: json-schema/iwant-fyi-match-response.json
  - type: JSONSchema
    url: json-schema/iwant-fyi-outcome.json
  - type: Webhooks
    url: asyncapi/iwant-fyi-webhooks.yml
  - type: Conformance
    url: conformance/iwant-fyi-conformance.yml
- name: iwant.fyi MCP Server
  description: Hosted streamable-HTTP Model Context Protocol server at https://iwant.fyi/api/mcp (protocol 2025-06-18). initialize
    and tools/list are public, and ten demand.* tools — search, find_vehicle, price_check, request_introduction, introduction_status,
    ask, list_verticals, list_constraints, health, capabilities — accept tools/call with no API key at 30 calls/min per IP;
    sixteen further tools (persisting wants, standing-want watches, supply declarations, legacy marketplace writes) need a
    self-issued bearer key. Listed in the Official MCP Registry (fyi.iwant/iwant) and Smithery.
  humanURL: https://iwant.fyi/developers
  baseURL: https://iwant.fyi/api/mcp
  tags:
  - MCP
  - AI Agents
  properties:
  - type: MCPServer
    url: mcp/iwant-fyi-mcp.yml
  - type: ToolCrosswalk
    url: mcp/iwant-fyi-tool-crosswalk.yml
  - type: Documentation
    url: https://iwant.fyi/skill.md
- name: iwant.fyi A2A Agent
  description: 'Agent-to-Agent endpoint at https://iwant.fyi/api/a2a (JSON-RPC message/send and tasks/get) that needs no key:
    send plain text describing what the user wants and receive ranked matches in a data part, with at most one clarifying
    question (an A2A Task in state input-required). Sellers describe what they offer the same way and have matching wants
    forwarded to the A2A URL in their own agent card. Every exchange is published on the public agent feed.'
  humanURL: https://iwant.fyi/developers
  baseURL: https://iwant.fyi/api/a2a
  tags:
  - A2A
  - AI Agents
  properties:
  - type: Documentation
    url: https://iwant.fyi/developers
  - type: RSS
    url: https://iwant.fyi/agents/feed/rss.xml
- aid: iwant-fyi:iwant-fyi-agents-api
  name: iwant.fyi Agents API
  description: The Agents API from iwant.fyi — 2 operation(s) for agents.
  humanURL: https://iwant.fyi/developers
  baseURL: https://iwant.fyi/api
  tags:
  - Agents
  properties:
  - type: OpenAPI
    url: openapi/iwant-fyi-agents-api-openapi.yml
  - type: Documentation
    url: https://iwant.fyi/agent.md
  - type: Conventions
    url: conventions/iwant-fyi-conventions.yml
  - type: Idempotency
    url: conventions/iwant-fyi-conventions.yml
  - type: ErrorCatalog
    url: errors/iwant-fyi-problem-types.yml
  - type: DataModel
    url: data-model/iwant-fyi-data-model.yml
  - type: RateLimits
    url: rate-limits/iwant-fyi-rate-limits.yml
- aid: iwant-fyi:iwant-fyi-mcp-api
  name: iwant.fyi MCP API
  description: The Mcp API from iwant.fyi — 1 operation(s) for mcp.
  humanURL: https://iwant.fyi/developers
  baseURL: https://iwant.fyi/api
  tags:
  - MCP
  tags_raw:
  - Mcp
  properties:
  - type: OpenAPI
    url: openapi/iwant-fyi-mcp-api-openapi.yml
  - type: Documentation
    url: https://iwant.fyi/agent.md
  - type: Conventions
    url: conventions/iwant-fyi-conventions.yml
  - type: Idempotency
    url: conventions/iwant-fyi-conventions.yml
  - type: ErrorCatalog
    url: errors/iwant-fyi-problem-types.yml
  - type: DataModel
    url: data-model/iwant-fyi-data-model.yml
  - type: RateLimits
    url: rate-limits/iwant-fyi-rate-limits.yml
- aid: iwant-fyi:iwant-fyi-wants-api
  name: iwant.fyi Wants API
  description: The Wants API from iwant.fyi — 2 operation(s) for wants.
  humanURL: https://iwant.fyi/developers
  baseURL: https://iwant.fyi/api
  tags:
  - Wants
  properties:
  - type: OpenAPI
    url: openapi/iwant-fyi-wants-api-openapi.yml
  - type: Documentation
    url: https://iwant.fyi/agent.md
  - type: Conventions
    url: conventions/iwant-fyi-conventions.yml
  - type: Idempotency
    url: conventions/iwant-fyi-conventions.yml
  - type: ErrorCatalog
    url: errors/iwant-fyi-problem-types.yml
  - type: DataModel
    url: data-model/iwant-fyi-data-model.yml
  - type: RateLimits
    url: rate-limits/iwant-fyi-rate-limits.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: RateLimits
  url: rate-limits/iwant-fyi-rate-limits.yml
- type: Pricing
  url: https://iwant.fyi/terms
- type: Overlay
  url: overlays/iwant-fyi-openapi-overlay.yaml
- type: Website
  url: https://iwant.fyi/
- type: DeveloperPortal
  url: https://iwant.fyi/developers
- type: Documentation
  url: https://iwant.fyi/agent.md
- type: APIReference
  url: https://iwant.fyi/protocol/v1
- type: GettingStarted
  url: https://iwant.fyi/skill.md
- type: Support
  url: https://github.com/staugs/iwantfyi-spec/issues
- type: Blog
  url: https://iwant.fyi/blog
- type: RSS
  url: https://iwant.fyi/rss.xml
- type: GitHubOrganization
  url: https://github.com/staugs
- type: SignUp
  url: https://iwant.fyi/auth/login
- type: TermsOfService
  url: https://iwant.fyi/terms
- type: PrivacyPolicy
  url: https://iwant.fyi/privacy
- type: About
  url: https://iwant.fyi/about
- type: LLMsTxt
  url: llms/iwant-fyi-llms.txt
- type: AgentCard
  url: a2a/iwant-fyi-a2a.yml
- type: WellKnown
  url: well-known/iwant-fyi-well-known.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Packages
  url: packages/iwant-fyi-packages.yml
- type: SDKs
  url: packages/iwant-fyi-packages.yml
- type: CLI
  url: cli/iwant-fyi-cli.yml
- type: Authentication
  url: authentication/iwant-fyi-authentication.yml
- type: Lifecycle
  url: lifecycle/iwant-fyi-lifecycle.yml
- type: Deprecation
  url: lifecycle/iwant-fyi-lifecycle.yml
- type: ChangeLog
  url: changelog/iwant-fyi-changelog.yml
- type: Plans
  url: plans/iwant-fyi-plans-pricing.yml
- type: DomainSecurity
  url: security/iwant-fyi-domain-security.yml
- type: AgenticAccess
  url: agentic-access/iwant-fyi-agentic-access.yml
- type: RegulatoryPosture
  url: regulatory/iwant-fyi-regulatory-posture.yml
- type: DataSubjectRequest
  url: https://iwant.fyi/privacy
- type: Subprocessors
  url: https://iwant.fyi/privacy
- type: AITransparency
  url: https://iwant.fyi/agent.md
x-enrichment:
  date: '2026-09-19'
  status: enriched
  artifacts_added: 33
  pass: local-v3
x-a2a:
  verified: true
  probed: '2026-09-26'
  url: https://iwant.fyi/.well-known/agent-card.json
  grade: conformant
  protocol_version: 0.3.0
  control: 404

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