What Agents Buy

Name: What Agents Buy
Author: neilkpatel

by neilkpatelversion 1.0.1i★ –iRuns in the cloud

Registry namecom.whatagentsbuy/whatagentsbuy

Install

Overview

Description from the maker (original English)

Independent measured reviews of x402 API sellers: pre-payment verdicts and accuracy grades.

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
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: 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://whatagentsbuy.com/mcp

Run this in your terminal

claude mcp add --transport http whatagentsbuy https://whatagentsbuy.com/mcp

Open in Cursor

Or copy the settings yourself

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

{
  "mcpServers": {
    "whatagentsbuy": {
      "url": "https://whatagentsbuy.com/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": {
    "whatagentsbuy": {
      "type": "http",
      "url": "https://whatagentsbuy.com/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://whatagentsbuy.com/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 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified against the domain whatagentsbuy.com (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
… 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 1745 servers in this category
Published to the registry more recently than 29% of the other 1745 servers in this category
Basic checks equal to or better than 100% of the other 1745 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 What Agents Buy 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 (1.0.1) reached the registry 3 months 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:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Spree Commerce: open-source B2B and marketplace ecommerce

by spree

Open-source B2B and marketplace ecommerce; new stores include an MCP server for AI agents.

Runs in the cloud★ 15,812BSD-3-ClauseUpdated 7 days ago

Install

Stripe MCP

by stripe

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★ 2,043MITUpdated 12 months ago

Install

MCP Cn Commerce

by TonyWang-hub

8 read-only MCP platform entries; support is operation-specific; merchant live acceptance pending

Runs on your computer★ 96MITUpdated 27 days ago

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.

What Agents Buy

Independent, measured reviews of the x402 APIs that AI agents pay for.

Live at [whatagentsbuy.com](https://whatagentsbuy.com) · MCP server at https://whatagentsbuy.com/mcp · listed in the official MCP Registry as com.whatagentsbuy/whatagentsbuy.

Most numbers quoted about agentic payments come from registries and press releases, and they are wrong by orders of magnitude. This project measures the market directly. It pays x402 endpoints with a real wallet and publishes the receipt (what was quoted, what was actually charged, whether the goods arrived), sweeps every USDC payment agents make on Base straight off the chain, and grades the number a seller returns against a primary source that cannot be a reseller. Nothing is sponsored. No service pays to appear or to be graded.

This repository is the open methodology: the measurement pipeline and the agent-facing MCP server. The accumulated settlement history and the archive of paid responses stay private; everything they produce is published on the site.

What it measures

Settlement. USDC Transfer logs on Base, addressed to the payment wallet each service declares in its own x402 challenge. Measured from the chain, not from a registry's self-reported counters, which have been wrong by 30x. (sweep.py, leaderboard.py)
Delivery. Every graded call is a paid call. A field counts as delivered only if it is actually present in the response, checked against the seller's own schema, and every short verdict is re-verified with a second independent call before it is recorded. (conform.py, receipts.py)
Accuracy. For categories with an objective ground truth (crypto price, stock quote, FX rate, gas, wallet balance, weather), the number a seller returns is graded against a primary source that cannot be a reseller: an exchange median, a professional feed, the ECB, the chain itself. (lab.py, categorize.py)
Preflight. One CLEAR / HOLD / ABORT verdict per seller, folding live price and payTo honesty versus the listing, phantom paywalls, and delivery receipts into a single signal an agent can gate a payment on. A red light fires only from hard evidence. (preflight.py)

Every harsh finding is verified before it is published. Several early accusations turned out to be measurement bugs in this code, so the pipeline runs known-good canaries before it grades anyone, treats "we could not measure it" as inconclusive rather than a negative verdict, and re-verifies every shortfall twice.

The MCP server

api/mcp.js is a stateless, dependency-free MCP server (streamable HTTP, no auth, no payment) that exposes the measurements as tools an agent calls before it pays:

preflight(url) — the one pre-payment verdict; detail:true adds the full payment-safety read.
find_api(task) — discover a payable API for a task, proven-accurate sellers ranked first.
most_accurate(category) — rank an objective category by how close each seller's returned value is to a primary source.
get_service, search_services, top_services, list_traps, market_summary.

Add it with:

claude mcp add --transport http whatagentsbuy https://whatagentsbuy.com/mcp

Pipeline

fetch_registry.py    # discover the payable endpoints

sweep.py # Base USDC settlement tape (sweep_solana.py for Solana) whatsnew.py # registry diff, first-seen tracking probe.py # free directory probe: who answers, price/payTo honesty conform.py # the paid-call chokepoint: archive raw, judge, reconcile lab.py # daily accuracy corpus vs primary sources receipts.py # content-hashed, self-verifying dispute receipts leaderboard.py # settlement to a leaderboard + Organic Demand Score preflight.py # the pre-payment verdict engine build.py # everything to a static site

The *_shootout.py scripts buy the same thing from every seller in a category (email validation, gas, WHOIS, price, weather) and publish the contrast.

Tests

python3 tests.py            # pipeline invariants, fixture-based, no network

node --test api/*.test.js # the MCP server

Both run in CI on every push, and tests.py runs at three gates locally: before every build, in the pre-commit hook, and before any script spends money.

Author

Neil K. Patel — neilkpatel.com · LinkedIn

Feedback and corrections are welcome on LinkedIn.

License

The measurements published on the site are CC BY 4.0 (attribute What Agents Buy). This code is shared for transparency and independent review of the methodology.

What Agents Buy

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

What Agents Buy

What it measures

The MCP server

Pipeline

Tests

Author

License