How do I install What Agents Buy?

Copy the http config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.

Does What Agents Buy need an API key?

No required environment variable is listed on this record.

What transport does What Agents Buy use?

What Agents Buy is reached over HTTP.

When was What Agents Buy last checked?

Last checked 2026-11-08. Independent measured reviews of x402 API sellers: pre-payment verdicts and accuracy grades.

What Agents Buy MCP server

Power your agent

Add this server

The publisher's own URL. Not a PlugMCP endpoint.

Add to Cursor Add in Claude Add to VS Code Run on PlugMCP

Host a copy with our keys and logs.

Server URL

https://whatagentsbuy.com/mcp

The Claude button above opens Claude with the name and URL filled in. You still confirm it there.

shClaude Code

1claude mcp add --transport http com.whatagentsbuy-whatagentsbuy https://whatagentsbuy.com/mcp

Run in a terminal.

jsonClaude Desktop

1{2  "mcpServers": {3    "com.whatagentsbuy-whatagentsbuy": {4      "command": "npx",5      "args": [6        "-y",7        "mcp-remote",8        "https://whatagentsbuy.com/mcp"9      ]10    }11  }12}

claude_desktop_config.json

Remote · HTTPPublisher installStep-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Launch

Server facts

Remote

Transport: http
Version: 1.0.1
Last checked

Tools

No tool list yet. Remote servers get one after the first health check.

FAQ

Questions

What Agents Buy

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

Live at 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.

Add this server

Host a copy with our keys and logs.

Server facts

Tools

Questions

How do I install What Agents Buy?

Does What Agents Buy need an API key?

What transport does What Agents Buy use?

When was What Agents Buy last checked?

Documentation

What Agents Buy

What it measures

The MCP server

Pipeline

Tests

Author

License