MCP Tool · x402 · early usage

Find MCP servers matching a need, ranked by semantic similarity over a curated snapshot…

Find MCP servers matching a need, ranked by semantic similarity over a curated snapshot of MCP servers. Returns name, endpoint, description, source registry and a 0-1 relevance per match. Paid POST: up to 25 matches. Try GET /discover/sample.

by x402.agentindex.world · discovered, not yet claimed by its owner · updated 2026-10-07

30d calls4

30d payers3

MethodPOST

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Tags: mcp · discovery · bazaar

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-10-07

Input example from Bazaar metadata

{
  "q": "read a PDF and give me markdown"
}

Output example

{
  "matches": 3,
  "min_similarity": 0.3,
  "q": "read a PDF and give me markdown",
  "results": [
    {
      "description": "Extract a public PDF into clean markdown text, plus metadata and a real token count.",
      "name": "PDF Extract MCP",
      "observed_at": "2026-09-02T19:07:49.374328Z",
      "registry": "registre-mcp",
      "relevance": 0.7211,
      "url": "https://example.org/mcp/"
    },
    {
      "description": "Document conversion to markdown and structured text for LLM agents.",
      "name": "Docling Server",
      "observed_at": "2026-09-10T12:00:00Z",
      "registry": "annuaire",
      "relevance": 0.6487,
      "url": null
    },
    {
      "description": "Deep code indexing for AI agents. FTS5 + embeddings + call graphs. Fully local.",
      "name": "Srclight",
      "observed_at": "2026-09-15T08:30:00Z",
      "registry": "registre-mcp",
      "relevance": 0.4102,
      "url": "https://example.com/mcp/"
    }
  ],
  "snapshot_date": "2026-09-18",
  "snapshot_rows": 10327
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/33905.json for the price and payment options.
Pay. Call GET https://x402.agentindex.world/discover. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.001 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base
Demand: 4 calls · 3 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.001	0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69d	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69d",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "properties": {
        "matches": {
          "description": "Number of servers above the threshold before the top-N cut.",
          "type": "integer"
        },
        "min_similarity": {
          "description": "The similarity threshold applied.",
          "type": "number"
        },
        "q": {
          "description": "The query that was matched."
        },
        "results": {
          "description": "Best-matching MCP servers, most relevant first.",
          "items": {
            "properties": {
              "description": {
                "description": "What the server does, as observed.",
                "type": "string"
              },
              "name": {
                "description": "Server name as observed.",
                "type": "string"
              },
              "registry": {
                "description": "Registry or listing where it was seen."
              },
              "relevance": {
                "description": "Cosine similarity between the query and this server, 0 to 1.",
                "type": "number"
              },
              "url": {
                "description": "Endpoint URL, when one was observed."
              }
            },
            "type": "object"
          },
          "type": "array"
        },
        "snapshot_date": {
          "description": "Date the underlying MCP snapshot was taken.",
          "type": "string"
        },
        "snapshot_rows": {
          "description": "Number of MCP servers in the snapshot.",
          "type": "integer"
        }
      },
      "required": [
        "q",
        "results"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {
    "matches": 0,
    "min_similarity": 0,
    "q": null,
    "results": [
      {
        "description": "string",
        "name": "string",
        "registry": null,
        "relevance": 0,
        "url": null
      }
    ],
    "snapshot_date": "string",
    "snapshot_rows": 0
  },
  "type": "string"
}

Examples

curl

curl "https://x402.agentindex.world/discover"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://x402.agentindex.world/discover");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://x402.agentindex.world/discover")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: x402.agentindex.world
Endpoint: https://x402.agentindex.world/discover
Machine-readable: /resources/33905.json