API Tools

whatagentsbuy.com

A marketplace intelligence tool for x402 APIs, grading sellers and helping find vetted, payable services.

x402 supported1 endpoint7 known toolsFirst detected August 18, 2026Last detected September 18, 2026

ENDPOINT 1

https://whatagentsbuy.com/mcp

No auth detected

MCP server metadata

Name: whatagentsbuy
Version: 1.1.0

Capabilities

tools

Server instructions

Independent measurements of x402 API sellers. Grades come from actually paying each service and recording what happened; nothing is sponsored. WHICH TOOL FOR WHICH JOB: need an API for a task -> find_api (every result carries its preflight verdict). About to pay one -> check_before_paying (returns CLEAR / HOLD / ABORT / UNRATED in the `verdict` field, which is the field to gate on; `light` is the same decision as a colour, for display; detail:true for the full read). Deep-dive one seller -> look_up_seller. Want a leaderboard -> rank_sellers (by revenue or real_demand). A category with a right answer (crypto/stock/fx/gas/wallet/weather) -> rank_by_accuracy. How big is x402 -> market_size. Avoid known losses -> known_payment_traps. Every verdict carries a CONFIDENCE beyond the light: verified = a payment to this seller actually SETTLED and produced a gradeable result what came back (and how recently); checked = a free probe of its 402 only, no money moved; unproven = listed, not checked. A CLEAR you can lean on is a verified one, so gate on confidence too, not just the light, for payments that matter. The one rule that overrides everything: read the payTo and amount from the live 402 and sign against those, never a listing. How every grade and verdict here is produced, with the weights, sources and tolerances: https://whatagentsbuy.com/grading. Older tool names (preflight, get_service, top_services, most_accurate, is_organic, list_traps, market_summary, market_pulse) still work.

Known tools 7

find_api

USE WHEN you need an API that does something and want payable options.

Inferred read-only

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.

Potential side effects

look_up_seller

USE WHEN you have a specific seller host and want its full track record.

Inferred read-only

rank_sellers

USE WHEN you want a ranked list of sellers across the market.

Inferred read-only

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 reseller (exchange median, chain balanceOf, ECB rates, FMP quote).

Inferred read-only

market_size

USE WHEN asked how big x402 is, whether it is growing, or what settled recently.

Inferred read-only

known_payment_traps

USE WHEN writing payment code, or before trusting an unfamiliar seller.

Potential side effects

CONNECT WITH APPROVAL

Client installation

Review this server and its permissions before adding it. Secret placeholders must be set locally.

Codex

~/.codex/config.toml

[mcp_servers.whatagentsbuy]
url = "https://whatagentsbuy.com/mcp"
enabled = true

Claude Code

.mcp.json

{
  "mcpServers": {
    "whatagentsbuy": {
      "type": "http",
      "url": "https://whatagentsbuy.com/mcp"
    }
  }
}

Claude Desktop

Settings → Connectors → Add custom connector

Name: whatagentsbuy
Remote MCP URL: https://whatagentsbuy.com/mcp

Add this remote URL as a custom connector in Claude Desktop. Availability depends on the user plan and workspace policy.

Cursor

.cursor/mcp.json

{
  "mcpServers": {
    "whatagentsbuy": {
      "url": "https://whatagentsbuy.com/mcp"
    }
  }
}

Visual Studio Code

.vscode/mcp.json

Add to Visual Studio Code

{
  "servers": {
    "whatagentsbuy": {
      "type": "http",
      "url": "https://whatagentsbuy.com/mcp"
    }
  }
}

Generic MCP

Client-specific MCP configuration

{
  "name": "whatagentsbuy",
  "transport": "streamable-http",
  "url": "https://whatagentsbuy.com/mcp"
}

MCP Inspector

Run the official MCP Inspector locally and enter the indexed Streamable HTTP endpoint.

TRUST AND VERIFICATION EVIDENCE

Trust Data Available

BuiltWith Trust API v2 evidence for whatagentsbuy.com was fetched 2026-08-23T15:42:57.544Z and is being refreshed.

Trust status Neutral

whatagentsbuy.com is assessed as Neutral: No suspicious signals found, but no strong positive signal either

Indexed

Evidence is source-attributed and does not guarantee that a third-party server is safe. Risk labels are conservative metadata heuristics.