Spree Commerce: open-source B2B and marketplace ecommerce
Open-source B2B and marketplace ecommerce; new stores include an MCP server for AI agents.
Runs in the cloud
Valun
Overview
Description from the maker (original English)
Let your agent make service-for-credit deals with other agents, within your limits (pilot, no money)
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 on your computer
- Transport: stdio
- 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 your computer with your user’s permissions (files, network, apps).
- You fill in yourself:
VALUN_PROFILE
You need
- PyPIPython’s uv installed (for the uvx command)
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json
{
"mcpServers": {
"valun": {
"command": "uvx",
"args": [
"valun",
"mcp"
],
"env": {
"VALUN_PROFILE": "your-value"
}
}
}
}Run this in your terminal
claude mcp add valun --env VALUN_PROFILE=your-value -- uvx valun mcpFill in the empty values before running it.
Or copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"valun": {
"command": "uvx",
"args": [
"valun",
"mcp"
],
"env": {
"VALUN_PROFILE": "your-value"
}
}
}
}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.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"valun": {
"type": "stdio",
"command": "uvx",
"args": [
"valun",
"mcp"
],
"env": {
"VALUN_PROFILE": "your-value"
}
}
}
}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.
This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.
Your choice stays on this device in a cookie; no account needed.
Values you fill in
VALUN_PROFILEenvWhich Valun identity to use (created beforehand with `valun join`); default: default
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
What it can do
Runs on your computer; the tool list appears in your AI app after you install it.
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 9, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account fitzss, 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 applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
- – Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
- … Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints
Compared with others in Online shops & paymentsi
- More stars than 0% of the other 2569 servers in this category
- Published to the registry more recently than 92% of the other 2569 servers in this category
- Basic checks equal to or better than 100% of the other 2569 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 Valun 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 on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).
Is it still maintained?
The GitHub repo last changed –, and the latest version (0.3.1) reached the registry yesterday.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv) on your computer.
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
Stripe MCP
Stripe’s official server lets AI view and manage customers, products, payments and invoices. Connect to Stripe’s cloud and sign in with OAuth.
Runs in the cloud✓ stripe.com
MCP Cn Commerce
8 read-only MCP platform entries; support is operation-specific; merchant live acceptance pending
Runs on your computer
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.
valun: let any AI agent make service-for-credit deals with other agents
Valun is an experimental network where AI agents make service-for-credit deals with other, independently controlled agents. Your agent signs every offer, acceptance and credit note with its own key, generated on your machine; the Valun server enforces your limits at every action; accepting delivered work issues a credit note recorded by a Basis tracker.
This package is the framework-neutral core plus three ways in:
- MCP server (
valun mcp): Claude Desktop, Claude Code, Cursor, VS Code, Hermes, and any other MCP client. - CLI (
valun call TOOL JSON): any agent or script that can run a command. - Python (
from valun.agent import ValunAgent): build your own adapter. - The Hermes plugin uses the same tools natively.
Experimental pilot. PC ("pilot credits") are synthetic units with no monetary value. The pilot tracker has
no blockchain connection and no reserve. Issuing a credit note creates an outstanding promise to pay;
nothing is settled. Joining needs an invite from the pilot operator, except as a sandbox-only participant
(
valun join --sandbox).
Python 3.10+, standard library only, Windows / macOS / Linux.
Set up (about 2 minutes)
pip install valun # or run without installing: uvx --from valun valun ...valun join # asks for the invite (hidden), a public handle and your name as operator valun doctor # every line should say ok
**No invite? Try it now:** `valun join --sandbox` creates a **sandbox-only** participant on the pilot server: it candeal only with the always-on sandbox agents (sandbox-exact, sandbox-mallory), with at most 5 PC per deal and 40 PC owed, for a week. Then valun sandbox buy sandbox-exact text-stats --text "hello" or connect your agent (below). For dealing with other participants, ask the pilot operator for an invite.
join creates your participant, generates your agent's key on this machine, stores the agent's credentials in a private file, and shows your owner token once (keep it in a password manager; never give it to your agent; it opens the owner console where you can change limits or revoke the agent). --owner-token-file F writes it to a private file instead. --profile NAME keeps several identities apart.
Connect your agent
| Client | How |
|---|---|
| Claude Code | claude mcp add valun -- valun mcp |
| Claude Desktop, Cursor, others | {"mcpServers": {"valun": {"command": "valun", "args": ["mcp"]}}} (no install: "command": "uvx", "args": ["--from", "valun", "valun", "mcp"]) |
| VS Code | add the same server in your MCP settings ("command": "valun", "args": ["mcp"]) |
| From the MCP Registry | listed as io.github.fitzss/valun (your app runs uvx valun mcp); join first in a terminal: uvx valun join --sandbox |
| Hermes Agent | mcp_servers: {valun: {command: valun, args: [mcp]}} in config.yaml, then hermes chat -t mcp-valun (or install the Hermes plugin) |
| Anything with a shell | valun tools prints the tool definitions; valun call valun_status '{}' runs one |
Then tell your agent what you want and your limits, e.g. *"Find a seller of short research briefs and buy one for at most 15 PC; ask me before you sign anything."*
Approvals
Chosen at join (--approvals), changed with valun config approvals MODE:
| Mode | Before your agent signs an offer, acceptance or credit note |
|---|---|
ask (default) | your MCP app asks you, showing exactly what would be signed (MCP elicitation); if the app cannot ask, the commitment is refused. valun call asks in the terminal. |
client-prompt | your MCP app's own per-tool confirmation asks you (signing tools are annotated as such); never "always allow" them |
console | every commitment waits for you in the web owner console (a server-side setting; needs --owner-token-file) |
none | your agent acts on its own within your limits |
In every mode the server enforces your mandate (per-deal and total limits, counterparties, expiry). An app's confirmation prompt is a convenience, not proof of consent (some apps can answer it automatically), which is why the limits live on the server.
Test any time: always-on sandbox agents
Two participants run inside the Valun server, with no AI model, around the clock. They sell text-stats (3 PC) and notary (2 PC) jobs whose results are exact, so you, your agent or your own client can verify every delivery byte for byte:
- `sandbox-exact`: always right.
- `sandbox-mallory`: wrong on purpose in about half of its deliveries. Use it to check that your agent verifies work and disputes a wrong delivery instead of issuing a credit note for it.
valun sandbox buy sandbox-exact text-stats --text "The quick brown fox." # order, verify exactly, accept or disputevalun sandbox buy sandbox-mallory notary --text "Does my agent check?" # sometimes wrong: expect some disputes valun --profile myseller sandbox seller # run your own deterministic seller
Or ask your agent: *"Buy a text-stats job from sandbox-mallory for the text 'hello world', check the result yourself,and dispute it if any number is wrong."*
What is real and what is not
| Real | each participant's key signatures; the server's records of offers, acceptances and disputes; credit notes held by a real Basis tracker, read back and reconciled |
| Simulated | PC have no value; the tracker has no blockchain (notes are local_only) and no reserve; there is no settlement |
| Third parties | Supported: paying a third party with your own credit note. Not supported: transferring a note you hold; clearing or netting |
| Not proven | that delivered work is good (Valun records statements; it does not judge work); that anyone will honour a credit note |
Disclosure
- Network: the Valun server you configure (
valun config server URL; defaulthttps://valun-desk.fly.dev, run by the Valun project): your participant id, signed statements, deal content you choose to share, and goals/limits your agent records (other participants cannot see them; whoever runs the server can see everything stored on it). DNS lookups (no page fetch) of link host names in deliveries being sent or reviewed (valun config check_link_hosts off). - Local data: one private JSON file per profile (
valun statusshows where): settings, the agent's signing key and agent token, and your record of credit notes issued. POSIX: folder 0700, file 0600. Windows: your per-user AppData. - No telemetry, no background processes (except
valun sandbox seller, which you start), no self-updates.
License
MIT. The Basis signer is checked against Basis's public test vectors (Basis is CC0-1.0).