# x402 MCP Starter (remote · x402-mcp-starter.kadopi.workers.dev)

Free self-hosted x402 USDC billing for Cloudflare MCP servers, with a Base Sepolia test endpoint.

- Trust score: 68/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-21

## Components

- remote · `x402-mcp-starter.kadopi.workers.dev`: 68/100 (this document), [markdown](https://verifymcp.io/servers/kadopi-x402-mcp-starter/x402-mcp-starter.md), [page](https://verifymcp.io/servers/kadopi-x402-mcp-starter/x402-mcp-starter)

## Channel facts

- Endpoint: `https://x402-mcp-starter.kadopi.workers.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.2.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-09-21.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 60/100
  - AI-judged instruction clarity (fair).
  - Tool/resource definitions use about 117 tokens (~58/item across 2 items; 2 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 50/100
  - Stability observed for 15 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 67/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 0% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 2 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 2 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the x402 MCP Starter server?

x402 MCP Starter is a hosted endpoint at https://x402-mcp-starter.kadopi.workers.dev/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http kadopi-x402-mcp-starter 'https://x402-mcp-starter.kadopi.workers.dev/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "kadopi-x402-mcp-starter": {
      "url": "https://x402-mcp-starter.kadopi.workers.dev/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "kadopi-x402-mcp-starter": {
      "type": "http",
      "url": "https://x402-mcp-starter.kadopi.workers.dev/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.kadopi-x402-mcp-starter]
url = "https://x402-mcp-starter.kadopi.workers.dev/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "kadopi-x402-mcp-starter": {
      "type": "remote",
      "url": "https://x402-mcp-starter.kadopi.workers.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add kadopi-x402-mcp-starter --url 'https://x402-mcp-starter.kadopi.workers.dev/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  kadopi-x402-mcp-starter:
    url: "https://x402-mcp-starter.kadopi.workers.dev/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "kadopi-x402-mcp-starter": {
      "Transport": "http",
      "Url": "https://x402-mcp-starter.kadopi.workers.dev/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add kadopi-x402-mcp-starter -t streamable-http -u 'https://x402-mcp-starter.kadopi.workers.dev/mcp'
```

### Other

```json
{
  "mcpServers": {
    "kadopi-x402-mcp-starter": {
      "type": "http",
      "url": "https://x402-mcp-starter.kadopi.workers.dev/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-20 (score 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-17 (score 67, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-15 (score 66, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-13 (score 65, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-11 (score 64, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-09 (score 63, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-07 (score 62, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-09-06 (score 61)

First indexed and scored.

## MCP tools (2)

### `validate_x402_config` (~81 tokens)

Validate x402 payment configuration

Free: checks Base USDC, price, amount, recipient, and facilitator settings before you deploy an x402-paid MCP tool.

Input parameters:

- `amount` (string, required)
- `asset` (string, required)
- `facilitatorUrl` (string, required)
- `network` (string, required)
- `payTo` (string, required)
- `priceUsd` (number, required)

### `get_paid_sample` (~36 tokens)

Get a paid sample result

Fixed-price reference path: confirms that an x402-aware MCP client can pay and receive a receipt.

Input parameters:

- `option` (string, required)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/kadopi-x402-mcp-starter/x402-mcp-starter#diagnostics

## Score history

- 2026-09-21: 68
- 2026-09-20: 68
- 2026-09-19: 67
- 2026-09-18: 67
- 2026-09-17: 67
- 2026-09-16: 66
- 2026-09-15: 66
- 2026-09-14: 65
- 2026-09-13: 65
- 2026-09-12: 64
- 2026-09-11: 64
- 2026-09-10: 63
- 2026-09-09: 63
- 2026-09-08: 62
- 2026-09-07: 62
- 2026-09-06: 61

## Common questions

### What is the x402 MCP Starter server?

x402 MCP Starter is listed in the public MCP registry as io.github.kadopi/x402-mcp-starter. Free self-hosted x402 USDC billing for Cloudflare MCP servers, with a Base Sepolia test endpoint. This page covers its hosted endpoint (https://x402-mcp-starter.kadopi.workers.dev/mcp).

### Is the x402 MCP Starter server safe to use?

x402 MCP Starter scores 68 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the x402 MCP Starter server expose?

x402 MCP Starter exposes 2 tools: validate_x402_config, get_paid_sample. Their descriptions and schemas cost roughly 117 tokens of context every time the server is loaded.

### Does the x402 MCP Starter server require authentication?

No. We connected to x402 MCP Starter without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the x402 MCP Starter server still maintained?

x402 MCP Starter is still listed as active in the MCP registry. We last reached this channel on 21 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://x402-mcp-starter.kadopi.workers.dev/mcp
- Repository: https://github.com/kadopi/x402-mcp-starter
- Changelog RSS feed: https://verifymcp.io/servers/kadopi-x402-mcp-starter/x402-mcp-starter.xml
- Changelog JSON feed: https://verifymcp.io/servers/kadopi-x402-mcp-starter/x402-mcp-starter.json
- HTML version of this page: https://verifymcp.io/servers/kadopi-x402-mcp-starter/x402-mcp-starter