A2A Retailmedia — the agentic retail-media hub for grocery

Name: A2A Retailmedia — the agentic retail-media hub for grocery
Author: greencore-solutions

by greencore-solutionsversion 1.0.2i★ –iRuns in the cloud

Registry nameio.github.greencore-solutions/a2a-retailmedia

Install

Overview

Description from the maker (original English)

Connecting grocery retail to 350k makers for media buys.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiVery new★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs in the cloud
Transport: Streamable HTTP
Category: Online shops & payments

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on the maker’s server: what you ask it goes through their server.
The registry lists no key to fill in.

You need

Runs in the cloudNothing to install; it connects over the internet

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

Open Settings → Connectors
Press Add custom connector
Paste the address below and press Add
If it asks you to sign in, sign in with the maker

https://mcp.a2a-retailmedia.ai/mcp

Run this in your terminal

claude mcp add --transport http a2a-retailmedia https://mcp.a2a-retailmedia.ai/mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "a2a-retailmedia": {
      "url": "https://mcp.a2a-retailmedia.ai/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "a2a-retailmedia": {
      "type": "http",
      "url": "https://mcp.a2a-retailmedia.ai/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

ChatGPT connects only to servers on the internet:

Open ChatGPT on the web → Settings → Connectors (Apps)
Press Create or Add (some plans need Developer mode under Advanced first)
Paste the address below, give it a name and save
If it asks you to sign in, sign in with the maker

https://mcp.a2a-retailmedia.ai/mcp

Menu names can differ slightly by plan and over time.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

We have not read this server’s tool list yet; we check endpoints in rotation.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 8, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account greencore-solutions, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
… Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
… Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
… Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint

Compared with others in Online shops & paymentsi

More stars than 0% of the other 2546 servers in this category
Published to the registry more recently than 46% of the other 2546 servers in this category
Basic checks equal to or better than 100% of the other 2546 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is A2A Retailmedia — the agentic retail-media hub for grocery safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.2) reached the registry 34 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Spree Commerce: open-source B2B and marketplace ecommerce, Stripe MCP, MCP Cn Commerce

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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Install

Stripe MCP

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by stripeGrowing★ 2KUpdated 12 months ago

Runs in the cloud✓ stripe.com

Install

MCP Cn Commerce

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by TonyWang-hubEarly↓ 73/wk★ 96Updated 29 days ago

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Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

A2A Retailmedia — the agentic retail-media hub for grocery

Connecting grocery retail to 350k makers for media buys. Not a broker, not AdWords, not a commission — the B2B agentic hub for grocery media with x402.

Connecting grocery retail to 350k makers for media buys. Not a broker, not AdWords, not a commission — the B2B agentic hub for grocery media with x402. A2A Retailmedia is operated by GreenCore Solutions Corp.: an Agent-to-Agent (A2A) hub with a Model Context Protocol (MCP) door for grocery retail media. The retailer is the seller of media and the maker's agent is the buyer. Every grocery banner in 20 markets has a signed card with a status — unclaimed, claimed or registered — that carries only what the banner itself publishes about its media program. GreenCore Solutions Corp. owns no inventory, runs no auction, makes no creative and quotes no price. Reads are open. Call resolve_jurisdiction, then resolve_actor, then gate_transaction before the handshake tools. submit_demand needs the maker, a budget a person has approved, a Global Trade Item Number (GTIN) and a list of banners, or it returns a gap. Artificial intelligence makes mistakes. A2A Retailmedia is an agentic information source, not a recommendation. No ads, ever. No rank for sale. Trade only.

A2A Retailmedia is built and run by GreenCore Solutions Corp. (github.com/greencore-solutions). This is the public connect kit, MIT.

The door

streamable-HTTP, stateless, server name a2a-retailmedia, door version 1.0.2, 19 tools (read from the wire)

Endpoint: https://mcp.a2a-retailmedia.ai/mcp — any client that speaks streamable-HTTP: { "url": "https://mcp.a2a-retailmedia.ai/mcp", "transport": "streamable-http" }
Agent Card: https://a2a-retailmedia.ai/.well-known/agent-card.json (EdDSA, kid a2arm-2026-10; keyring /.well-known/jwks.json)
Docs: https://a2a-retailmedia.ai/docs · Text for agents: https://a2a-retailmedia.ai/llms.txt
Official MCP Registry: io.github.greencore-solutions/a2a-retailmedia (server.json in this repo)

The cards

Every grocery banner on the record has a signed card: https://a2a-retailmedia.ai/agents/{market}/{banner}.json, with a page at the same address without .json. The signed index is https://a2a-retailmedia.ai/agents/index.json.

unclaimed — the banner is listed; a maker's agent is referred to the banner's public media program page, or to a person where none is listed.
claimed — the retailer has signed in with Microsoft 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 carries the media program, the operator, what it sells and the public program page — each only as the banner's own page states it. Never a price, inventory or a rate card. Retailers claim a card from its page.

The twenty markets

Europe: France, Germany, Italy, Spain, Poland, UK, Netherlands, Belgium, Switzerland. Americas: United States, Canada, Mexico, Brazil. Asia-Pacific: Japan, South Korea, India, Vietnam, Thailand, Singapore, Australia.

The tools

Gate — resolve_jurisdiction, resolve_actor, gate_transaction
Find — find_makers, resolve_gtin, check_eligibility, list_banners
Cards — get_banner_card, list_banner_cards
Packages — list_packages, quote_package, find_buyer
Handshake — submit_demand, receive_demand, a2a_handoff
After — pull_measurement, renew_package, log_audit
Makers — enrol_maker

Reads are open. Three calls come before the handshake tools: resolve_jurisdiction → resolve_actor → gate_transaction. submit_demand takes the packet — the maker, a budget a person has approved, one or more Global Trade Item Numbers (GTIN), a market and a list of banners — or returns a gap naming what is missing.

Two worked prompts

Maker side — "Which grocery banners in the UK list a retail media program, and what does each say it sells?"

Retailer side — "Show me the card for my banner in France and tell me how to claim it."

Examples

Stock clients, no adapter: examples/aws_strands.py · examples/azure_semantic_kernel.py · examples/google_genai.py · examples/generic_mcp_client.py.

Settle on it

The handshake settles at the door: https://a2a-retailmedia.ai/api (x402, two accept entries; a refused handoff is not settled and not charged). GreenCore Solutions Corp. quotes no price for media.

Search words

retail media · grocery · retail media network · advertiser · maker · brand · banner · media program · agent card · claim · handshake · GTIN · x402 · AI agent · agent-to-agent · 20 markets · A2A Retailmedia · agentic hub

Contact

https://gsc-em.com/#contact — a person at GreenCore Solutions Corp. reads it.

Built and run by GreenCore Solutions Corp.. Artificial intelligence makes mistakes. A2A Retailmedia is an agentic information source, not a recommendation. No ads, ever. No rank for sale. Trade only.

A2A Retailmedia — the agentic retail-media hub for grocery

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Online shops & paymentsi

Common questions

Alternatives

Spree Commerce: open-source B2B and marketplace ecommerce

Stripe MCP

MCP Cn Commerce

README from the maker

A2A Retailmedia — the agentic retail-media hub for grocery

The door

The cards

The twenty markets

The tools

Two worked prompts

Examples

Settle on it

Search words

Contact