Open-source B2B and marketplace ecommerce; new stores include an MCP server for AI agents.
Mercoa MCP by usefulapi
Overview
Description from the maker (original English)
Query and manage Mercoa AP/AR bill-pay: entities, invoices, transactions and payment methods.
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 checksi3 of 3 passedChecked from public information; code not scanned yet
- UsageiNot measured yet★ –
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: 3 of 3 passed
- Runs on the maker’s server: what you ask it goes through their server.
- Can do 17 things (tools) mercoa_find_entities, mercoa_get_entity, mercoa_get_entity_events, mercoa_get_entity_invoice_metrics …
- 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?
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://mercoa.usefulapi.io/mcpRun this in your terminal
claude mcp add --transport http mercoa https://mercoa.usefulapi.io/mcpOr copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"mercoa": {
"url": "https://mercoa.usefulapi.io/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.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"mercoa": {
"type": "http",
"url": "https://mercoa.usefulapi.io/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://mercoa.usefulapi.io/mcpMenu 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
Tool names and descriptions exactly as the server reported them on Nov 6, 2026. The maker wrote them, not us; we show them as plain text.
mercoa_find_entitiesFind/search entities (buyers, vendors, payors, payees). Use to look up counterparties by name/email/foreignId or list all. GET /entity.
mercoa_get_entityGet a single entity by ID (or foreign ID). GET /entity/{entityId}.
mercoa_get_entity_eventsGet the event/audit log for an entity. GET /entity/{entityId}/events.
mercoa_get_entity_invoice_metricsGet aggregate invoice metrics (totals/counts, grouped by currency) for an entity's payables/receivables — for AP/AR dashboards and aging. GET /entity/{entityId}/invoice-metrics.
mercoa_list_entity_payment_methodsList an entity's payment methods (bank accounts, cards, check, etc.). GET /entity/{entityId}/paymentMethods.
mercoa_get_payment_methodGet a single payment method for an entity. GET /entity/{entityId}/paymentMethod/{paymentMethodId}.
mercoa_list_entity_usersList the users belonging to an entity (approvers, admins, etc.). GET /entity/{entityId}/users.
mercoa_find_invoicesFind/search invoices (bills) across payers and vendors. Filter by status, entity, date, approver and more. GET /invoices (plural list endpoint).
mercoa_get_invoiceGet a single invoice (bill) by ID. GET /invoice/{invoiceId}.
mercoa_get_invoice_eventsGet the event/audit log for an invoice (status changes, approvals, payments). GET /invoice/{invoiceId}/events.
mercoa_find_transactionsList/search payment transactions. Filter by entity, invoice, status, type and date. GET /transactions.
mercoa_get_transactionGet a single payment transaction by ID. GET /transaction/{transactionId}.
mercoa_get_organizationGet the caller's Mercoa organization configuration (settings, payment methods enabled, etc.). GET /organization.
mercoa_create_entityWRITE — creates a real entity (customer/vendor/payor/payee) in Mercoa. Supply role flags, accountType, and a nested `profile` object (business or individual details). POST /entity.
mercoa_create_invoiceWRITE — creates a real invoice/bill in Mercoa. Set status (DRAFT to stage, NEW to submit), amount, currency, payer/vendor, dates and line items. POST /invoice.
mercoa_update_invoiceWRITE — updates an existing invoice/bill (all fields optional). Commonly used to advance status (e.g. DRAFT→NEW→SCHEDULED) or change amounts, dates, or payment methods. POST /invoice/{invoiceId}.
mercoa_add_invoice_commentWRITE — adds a comment to an invoice (visible in its activity log). POST /invoice/{invoiceId}/comment.
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 6, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified against the domain usefulapi.io (the registry checks domain ownership)
- … 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
- ✓ Pass
Endpoint responds
Responded in 14 ms (HTTP 200)
- – Not applicable
Sign-in with OAuth
No sign-in needed
- ✓ Pass
No hidden instructions in tool descriptions
Read 17 tool descriptions and found no hidden instructions to the AI
Compared with others in Online shops & paymentsi
- More stars than 0% of the other 1743 servers in this category
- Published to the registry more recently than 91% of the other 1743 servers in this category
- Basic checks equal to or better than 100% of the other 1743 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 Mercoa MCP by usefulapi safe?
It passed 3 of 3 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 (1.35.3) reached the registry yesterday.
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:★ 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.
MCP Cn Commerce
8 read-only MCP platform entries; support is operation-specific; merchant live acceptance pending
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.
Mercoa MCP by usefulapi
Query and manage Mercoa AP/AR bill-pay — entities, invoices, transactions and payment methods — from Claude, Cursor, or any MCP client. Hosted, no local install — connect with your Mercoa API key.
Live endpoint: https://mercoa.usefulapi.io/mcp · Homepage: https://usefulapi.io/mercoa
Connect
- Claude (claude.ai, Desktop): open Customize → Connectors, click + Add → Add custom connector, and paste
https://mercoa.usefulapi.io/mcp. - Claude Code:
claude mcp add --transport http mercoa https://mercoa.usefulapi.io/mcp, then run/mcpto log in. - VS Code: Add to VS Code.
- Cursor and other clients: add the URL as a remote MCP server:
{
"mcpServers": { "mercoa": { "url": "https://mercoa.usefulapi.io/mcp" } } }
Add only the URL. Do not add an Authorization header or an API key to the client config: the server signs you in with OAuth, and the login page asks for your Mercoa credentials.
Step-by-step setup, where to find your credentials, and FAQ: https://usefulapi.io/mercoa/
On first connect you'll paste your Mercoa API key. It's validated, stored per-user, and scoped to you.
Tools
| Tool | Type | What it does |
|---|---|---|
mercoa_find_entities | read | Find entities |
mercoa_get_entity | read | Get entity |
mercoa_get_entity_events | read | Get entity events |
mercoa_get_entity_invoice_metrics | read | Get entity invoice metrics |
mercoa_list_entity_payment_methods | read | List entity payment methods |
mercoa_get_payment_method | read | Get payment method |
mercoa_list_entity_users | read | List entity users |
mercoa_find_invoices | read | Find invoices |
mercoa_get_invoice | read | Get invoice |
mercoa_get_invoice_events | read | Get invoice events |
mercoa_find_transactions | read | Find transactions |
mercoa_get_transaction | read | Get transaction |
mercoa_get_organization | read | Get organization |
mercoa_create_entity | write | Create entity |
mercoa_create_invoice | write | Create invoice |
mercoa_update_invoice | write | Update invoice |
mercoa_add_invoice_comment | write | Add invoice comment |
mercoa_usage_status | meta | Usage status (free-tier meter) |
mercoa_request_feature | meta | Request a missing feature |
mercoa_upgrade | meta | Upgrade to Pro or Pro+ |
mercoa_cancel_subscription | meta | Cancel the Pro subscription |
read tools are read-only; write tools mutate data (clients should confirm them); meta tools report usage, manage your subscription or send a feature request.
Pricing
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Pro | $9/mo or $90/yr (2 months free) | Unlimited* |
\*Pro has a fair use limit of 10,000 tool calls a month on this server. For more, write to support@usefulapi.io.
Pro covers this server only. Subscribe with mercoa_upgrade (it returns a Stripe Checkout link). Cancel any time with mercoa_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running mercoa_upgrade before then undoes the cancel. Or write to support@usefulapi.io.
License
MIT — see LICENSE. Documentation only; the server is hosted.