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iwant.fyi - demand-side commerce

staugs/iwantfyi-spec
authHTTPregistry active
Summary

This is the reference server for a new demand-side commerce protocol that lets agents post structured purchase intent and get back ranked matches from multiple suppliers. It exposes tools to create and manage "wants" (one-time or standing), fetch ranked match results, and report outcomes. Unlike supply-side protocols (ACP, UCP) that handle checkout flows, this sits upstream: you express what your user needs, the server coordinates matching and fulfillment across sources, and you get back actionable offers. Ships with a conformance test kit, JSON schemas at a well-known URL, and SDKs for TypeScript, LangChain, Composio, and CrewAI. Reach for it when you're building shopping or procurement agents that need to aggregate supply without hardcoding merchant integrations.

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Categories
Finance & Commerce
Registryactive
TransportHTTP
AuthRequired
UpdatedJun 9, 2026
View on GitHub

iwant.fyi demand-side protocol

The iwant.fyi demand-side protocol defines how AI agents express structured purchase intent on behalf of users, receive matched supply across multiple sources, and report outcomes back. It is MCP-native, transport-flexible, and intentionally agnostic about who matches the demand, who fulfills it, and how money moves.

Why

Existing agentic commerce protocols are supply-side: ACP and UCP define how an agent completes a purchase at a merchant; AP2 handles payment authorization; MCP is general tool/data access. None of them defines how an agent expresses what its user wants in a structured, machine-matchable form, or how that demand persists across sessions and gets fulfilled across multiple sources.

The iwant.fyi demand-side protocol fills that gap.

Spec

  • v1.1 (Draft) — Current. Additive, backward-compatible with v1.0: signed webhooks for Standing Wants (§16), partial-result transparency (§6.1), retryable error taxonomy (§11.2), idempotency keys (§8.4), capability discovery (§8.2), deterministic ordering + cursor (§6.3).

Read it rendered with anchors at iwant.fyi/protocol/v1.

JSON Schema for the core objects: schemas/1.1/ (also served live at https://iwant.fyi/.well-known/iwantfyi/schemas/1.1/).

Conformance

A test kit verifies any implementation against spec §15:

npx @iwantfyi/conformance-kit --mcp https://iwant.fyi/api/mcp --http https://iwant.fyi/api/v1 --api-key <key>

Source: conformance-kit/ · npm: @iwantfyi/conformance-kit (Apache-2.0). The reference implementation also self-reports at /api/v1/conformance.

Reference implementation

iwant.fyi — https://iwant.fyi/api/mcp

The iwant.fyi MCP server is the reference implementation. It advertises spec conformance and is the canonical surface to test against.

Official SDKs (all Apache 2.0)

FrameworkPackageRepo
TypeScript / generic@iwantfyi/sdkstaugs/iwantfyi-sdk
LangChain (Python)iwantfyi-langchainstaugs/iwantfyi-langchain
Composio (Python)iwantfyi-composiostaugs/iwantfyi-composio
CrewAI (Python)iwantfyi-crewaistaugs/iwantfyi-crewai

Three open-source example agents at staugs/iwantfyi-examples.

Status

v1.1 is published as a draft for public comment. Feedback, issues, and proposed extensions are welcome via GitHub issues or directly to hi@iwant.fyi.

License

The specification is published under the Apache License 2.0. Implementations are not required to be open source.

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