validar-semver
Resolves real semver range satisfaction (^1.2.3, ~2.0) against a version. Paid via x402/USDC.
Open source Repository Open in the app JSON README (API)
About
Resolves real semver range satisfaction (^1.2.3, ~2.0) against a version. Paid via x402/USDC.
Details
- Kind
- MCP servers
- Topic
- Finance & crypto
- Publisher
- encodi
- Origin
- official
- Category
- ferramentas
- Transport
- http
- Version
- 1.0.1
- Last push
- 2026-08-11T17:29:39Z
- Repository state
- ativo
- Language
- TypeScript
- License
- MIT
- Added
- 2026-08-29 03:02:45
- Updated
- 2026-08-29 03:02:45
- Origin id
io.github.encodi/validar-semver
README
# validar-semver
[](https://glama.ai/mcp/servers/encodi/validar-semver)
Remote MCP server (Cloudflare Workers) with one tool that resolves real semver range satisfaction:
- **`validate_semver`** — evaluates a version (e.g. `1.2.3`) against a list of ranges (`^1.2.3`, `~2.0`, `2.x`, `>=1.0.0 <2.0.0`, ...) using the same semver engine npm uses ([`semver`](https://www.npmjs.com/package/semver)), not a model guess about what should match.
No database, no persistent state: each call builds a fresh `McpServer` (see `createServer()` in `src/index.ts`) and is self-contained.
## Billing (x402)
Charges per call via [x402](https://x402.org) — real USDC payment on **Base mainnet**, against the Coinbase Developer Platform (CDP) facilitator. The payment travels inside the MCP JSON-RPC itself (`_meta`), not as an HTTP header; see `src/payments.ts`.
| Tool | Price |
|---|---|
| `validate_semver` | $0.01 USDC |
An unpaid `tools/call` returns `isError: true` with the `accepts` (network, amount, `payTo`) the client needs to pay and retry — not an unexplained exception.
## Structure
```
src/
index.ts # registers the tool in the McpServer and exposes the MCP HTTP handler
payments.ts # x402 billing on Base mainnet via the CDP facilitator
tools/
semver.ts # pure logic for validate_semver (testable without Workers)
semver.test.ts
scripts/
dev-node.ts # dev server that runs the handler in plain Node, no wrangler
```
## Running it locally
⚠️ **Note on `wrangler dev`**: the real Cloudflare Workers runtime (`workerd`) requires **macOS 13.5+**. If your Mac has an older version, `wrangler dev` (and `npm run dev`) will fail. This project includes a plain-Node shim that runs the exact same `fetch()` handler without needing `workerd`.
### 1. Install dependencies
```bash
npm install
```
### 2. Run the unit tests
```bash
npm test
```
### 3a. If your wrangler dev works (macOS 13.5+, Linux, Windows)
```bash
npm run dev
```
### 3b. If `wrangler dev` fails because of the macOS version
```bash
npm run dev:node
```
Starts at `http://localhost:8787/mcp`, reading CDP credentials from `~/.mcp-tools-factory-credentials.env` (shared across all tools in this factory).
### 4. Test with curl
```bash
# 1) initialize
curl -s -X POST http://localhost:8787/mcp \
-H "Content-Type: application/json" \
-H "Accept: application/json, text/event-stream" \
-d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"curl-test","version":"0.0.1"}}}'
# 2) tools/list
curl -s -X POST http://localhost:8787/mcp \
-H "Content-Type: application/json" \
-H "Accept: application/json, text/event-stream" \
-d '{"jsonrpc":"2.0","id":2,"method":"tools/list","params":{}}'
# 3) tools/call — validate_semver
curl -s -X POST http://localhost:8787/mcp \
-H "Content-Type: application/json" \
-H "Accept: application/json, text/event-stream" \
-d '{"jsonrpc":"2.0","id":3,"method":"tools/call","params":{"name":"validate_semver","arguments":{"version":"1.2.3","ranges":["^1.2.3","^1.3.0","~1.2.0","2.x"]}}}'
```
Responses come as Server-Sent Events (`event: message` + `data: {...}`); the `data:` line is the usual JSON-RPC response.
## Deploy and listings
Deployed at `https://validar-semver.encodari.workers.dev/mcp` (Cloudflare Workers). Published on the [official MCP registry](https://registry.modelcontextprotocol.io), [Smithery](https://smithery.ai), [mcp.so](https://mcp.so), and with an open PR to [awesome-mcp-servers](https://github.com/punkpeye/awesome-mcp-servers).
## What it doesn't do (yet)
- Charges on Base mainnet with real money. To switch back to testnet (Base Sepolia, `eip155:84532`) during development, change `NETWORK` in `src/payments.ts`.
- No database or persistent state between calls (beyond the billing config, cached in memory per isolate — see `src/payments.ts`).