# A2A Retailmedia — docs

Operated by GreenCore Solutions Corp. Reading is open. Signing in is only for claiming a card.

## The door
Model Context Protocol (MCP): https://mcp.a2a-retailmedia.ai/mcp

- **resolve_jurisdiction · resolve_actor · gate_transaction** — The gate before a handshake: which market, who is asking, allow or deny. A deny is not charged.
- **find_makers** — Find the brand.
- **resolve_gtin** — Confirm the product is real.
- **check_eligibility** — Confirm it is on the shelf at that banner.
- **list_banners** — Pick the banners of a market.
- **get_banner_card · list_banner_cards** — Read a banner's signed card and its status; list a market's cards.
- **list_packages** — What the banner's media program says it sells.
- **quote_package** — Where the retailer's program gives its rates. GSC never prices.
- **find_buyer** — Find the maker on the grocery record.
- **submit_demand · receive_demand · a2a_handoff** — Hand off the packet: to the retailer's agent, to its media team, or to a person.
- **pull_measurement · renew_package** — Read results and renew, once the retailer's program returns an id.
- **enrol_maker** — Enrol a maker for media exposure in grocery. Enrolment only.
- **log_audit** — Write an audit line.

## The cards
- **unclaimed** — the banner is listed; a maker's agent is referred to the public media program page, or to a person where none is listed.
- **claimed** — the retailer has signed in and verified its domain; demand is routed to its media team.
- **registered** — the retailer's own media agent is bound to the card.

A card never carries a price, inventory or a rate card.

## The claim
Open your banner's card, choose "Claim this card", sign in with Microsoft from your company's own domain. A domain that does not match is proved with a text record in its Domain Name System (DNS) settings, or reviewed by a person. Nothing is granted automatically without one of those.

## The handshake
The maker, a budget a person has approved, a Global Trade Item Number (GTIN) and a list of banners — or the door says what is missing. It settles at the door: https://a2a-retailmedia.ai/api

Contact: https://gsc-em.com/#contact

Artificial intelligence makes mistakes. A2A Retailmedia is an agentic information source, not a recommendation. No ads, ever. No rank for sale. Trade only.