What Agents Buy is a remote MCP server that gives an AI agent 7 tools, among them check_before_paying, find_api, known_payment_traps. It answers at https://whatagentsbuy.com/mcp over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 6 of 6 times since 10 September 2026; the last check, on 19 October 2026, succeeded.
Independent measured reviews of x402 API sellers: pre-payment verdicts and accuracy grades.
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
check_before_paying | USE WHEN your agent is about to pay an x402 API and you want to know if it is safe and worth it. Returns one verdict for a URL or host in the `verdict` field (gate on that; `light` is the same decision as a colour, for display): CLEAR (noth Inputs: url, detail |
find_api | USE WHEN you need an API that does something and want payable options. Searches the whole x402 market for what you describe and returns a ranked, pre-vetted shortlist, proven-accurate sellers first, then payment-safety, then price. Covers e Inputs: task, max_price_usdc, min_reliability, limit, allowed_verdicts |
known_payment_traps | USE WHEN writing payment code, or before trusting an unfamiliar seller. The field notes: each is a specific way an agent paying an API loses money or is misled, what it cost to learn, and what to do instead. (Formerly named list_traps.) Inputs: query |
look_up_seller | USE WHEN you have a specific seller host and want its full track record. Returns every grade earned by actually paying it, what was quoted versus charged, whether goods arrived, its settlement volume, and its Organic Demand Score with the d Inputs: host |
market_size | USE WHEN asked how big x402 is, whether it is growing, or what settled recently. Returns both what actually settled on Base over the last day (from chain logs, per tracked seller) and the live market pulse (24h volume and payments with day- |
rank_by_accuracy | USE WHEN a category has an objective right answer (crypto-price, stock-price, fx-rate, gas-price, wallet-balance, weather) and you want the sellers we PAID ranked by how close their returned value was to a primary source that cannot be a re Inputs: category, limit |
rank_sellers | USE WHEN you want a ranked list of sellers across the market. by='revenue' ranks by raw USDC received (who is busy); by='real_demand' ranks by Organic Demand Score (whose money comes from many independent wallets rather than one wallet supp Inputs: by, limit |
Every block below points at https://whatagentsbuy.com/mcp. Pick your client and copy.
claude mcp add --transport http what-agents-buy https://whatagentsbuy.com/mcp
{
"mcpServers": {
"what-agents-buy": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://whatagentsbuy.com/mcp"]
}
}
}{
"mcpServers": {
"what-agents-buy": {
"url": "https://whatagentsbuy.com/mcp"
}
}
}{
"servers": {
"what-agents-buy": {
"type": "http",
"url": "https://whatagentsbuy.com/mcp"
}
}
}{
"context_servers": {
"what-agents-buy": {
"url": "https://whatagentsbuy.com/mcp"
}
}
}{
"mcpServers": {
"what-agents-buy": {
"serverUrl": "https://whatagentsbuy.com/mcp"
}
}
}{
"mcpServers": {
"what-agents-buy": {
"url": "https://whatagentsbuy.com/mcp"
}
}
}name: What Agents Buy
version: 0.0.1
schema: v1
mcpServers:
- name: What Agents Buy
type: streamable-http
url: https://whatagentsbuy.com/mcp{
"mcpServers": {
"what-agents-buy": {
"httpUrl": "https://whatagentsbuy.com/mcp"
}
}
}{
"mcpServers": {
"what-agents-buy": {
"type": "http",
"url": "https://whatagentsbuy.com/mcp"
}
}
}{
"mcpServers": {
"what-agents-buy": {
"url": "https://whatagentsbuy.com/mcp"
}
}
}goose://extension?url=https%3A%2F%2Fwhatagentsbuy.com%2Fmcp&type=streamable_http&id=what-agents-buy&name=What%20Agents%20Buy
It answered our last check on 19 October 2026 in 244 ms. Over 6 checks since 10 September 2026 it answered 6. Status here comes from Neuronto's own probes, not from the publisher.
Yes. It is published by whatagentsbuy.com and served from whatagentsbuy.com, the vendor's own domain: https://whatagentsbuy.com/mcp.
7, as returned by the server's own tools/list on 11 September 2026: check_before_paying, find_api, known_payment_traps, look_up_seller, market_size, rank_by_accuracy, rank_sellers.
It answered our last check on 19 October 2026 in 244 ms. Over 6 checks since 10 September 2026 it answered 6.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://whatagentsbuy.com/mcp. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.
It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.
Publisher: com.whatagentsbuy. Endpoint host: whatagentsbuy.com. ARD identifier: urn:air:com.whatagentsbuy:mcp:whatagentsbuy.
First indexed 10 September 2026. The tools are exactly what the server returned; nothing on this page
is inferred from its name. Ranking in Neuronto search is never for sale.