regexcronsql-validator

Name: regexcronsql-validator
Author: encodi

by encodiversion 1.0.0i★ –iRuns in the cloud

Registry nameio.github.encodi/regexcronsql-validator

Install

Overview

Description from the maker (original English)

Valida regex, cron y SQL contra ejecucion real. Pago por llamada via x402/USDC.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs in the cloud
Transport: Streamable HTTP
Category: Databases & datasets

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on the maker’s server: what you ask it goes through their server.
The registry lists no key to fill in.

You need

Runs in the cloudNothing to install; it connects over the internet

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

Open Settings → Connectors
Press Add custom connector
Paste the address below and press Add
If it asks you to sign in, sign in with the maker

https://regexcronsql-validator.encodari.workers.dev/mcp

Run this in your terminal

claude mcp add --transport http regexcronsql-validator https://regexcronsql-validator.encodari.workers.dev/mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "regexcronsql-validator": {
      "url": "https://regexcronsql-validator.encodari.workers.dev/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "regexcronsql-validator": {
      "type": "http",
      "url": "https://regexcronsql-validator.encodari.workers.dev/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

ChatGPT connects only to servers on the internet:

Open ChatGPT on the web → Settings → Connectors (Apps)
Press Create or Add (some plans need Developer mode under Advanced first)
Paste the address below, give it a name and save
If it asks you to sign in, sign in with the maker

https://regexcronsql-validator.encodari.workers.dev/mcp

Menu names can differ slightly by plan and over time.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

We have not read this server’s tool list yet; we check endpoints in rotation.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account encodi, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
… Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
… Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
… Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint

Compared with others in Databases & datasetsi

More stars than 0% of the other 954 servers in this category
Published to the registry more recently than 24% of the other 954 servers in this category
Basic checks equal to or better than 100% of the other 954 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is regexcronsql-validator safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.0) reached the registry 3 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Supabase, MongoDB MCP Server, Elasticsearch MCP Server

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Supabase

by supabase

Supabase’s official server lets AI create tables, query data and review project settings in your Supabase database.

Computer or cloud★ 2,993Apache-2.0Updated yesterday

Install

MongoDB MCP Server

by mongodb-js

MongoDB Model Context Protocol Server

Runs on your computer★ 1,157Apache-2.0Updated 2 days ago

Install

Elasticsearch MCP Server

by cr7258

MCP server for interacting with Elasticsearch

Runs on your computer★ 315Apache-2.0Updated 14 months ago

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

regexcronsql-validator

Servidor MCP remoto (Cloudflare Workers, template remote-mcp-authless) con dos tools que validan contra ejecución real, no contra lo que un LLM cree que hacen:

`validar_regex` — corre el patrón con RegExp nativo de JS contra una lista de strings.
`validar_cron` — calcula las próximas ejecuciones reales de una expresión cron con cron-parser.
`validar_sql` — ejecuta una consulta SQL (dialecto Postgres) contra tablas de prueba en memoria con pg-mem y devuelve las filas reales resultantes.

Sin base de datos, sin estado persistente: cada llamada crea un McpServer nuevo (ver createServer() en src/index.ts) y es autocontenida — para validar_sql esto también aplica a las tablas de prueba: se crean desde cero en cada llamada (pg-mem en memoria) y se descartan al terminar.

Cobro (x402)

Las tres tools cobran por llamada vía x402 — pago en USDC real sobre Base mainnet, sin API key, contra el facilitator público x402.org/facilitator. El pago viaja dentro del propio JSON-RPC de MCP (_meta), no como header HTTP; ver src/payments.ts.

Tool	Precio
`validar_regex`	$0.02 USDC
`validar_cron`	$0.02 USDC
`validar_sql`	$0.04 USDC

Un tools/call sin pago devuelve isError: true con los accepts (red, monto, payTo) que el cliente necesita para pagar y reintentar — no una excepción sin explicar. Un cliente MCP x402-aware con wallet propia (ej. createX402MCPClient de @x402/mcp) firma el pago y lo adjunta automáticamente; probarlo end-to-end requiere una wallet con fondos reales en Base mainnet y su clave privada, algo que este repo no maneja ni pide.

Estructura

src/

index.ts # registra las tools en el McpServer y expone el handler HTTP MCP tools/ regex.ts # lógica pura de validar_regex (testeable sin Workers) regex.test.ts cron.ts # lógica pura de validar_cron (testeable sin Workers) cron.test.ts sql.ts # lógica pura de validar_sql (testeable sin Workers) sql.test.ts scripts/ dev-node.ts # servidor de dev que corre el handler en Node puro, sin wrangler

Correrlo local

⚠️ Nota sobre `wrangler dev`: el runtime real de Cloudflare Workers (workerd) requiere macOS 13.5+. Si tu Mac tiene una versión más vieja, wrangler dev (y npm run dev) van a fallar con Unsupported macOS version. Para ese caso este proyecto trae un shim en Node puro que corre exactamente el mismo fetch() handler sin necesitar workerd.

1. Instalar dependencias

npm install

2. Correr los tests unitarios

npm test

3a. Si tu wrangler dev funciona (macOS 13.5+, Linux, Windows)

npm run dev

Levanta en http://localhost:8787/mcp.

3b. Si `wrangler dev` falla por versión de macOS

npm run dev:node

Levanta el mismo handler en http://localhost:8787/mcp pero corriendo en Node directo (usa tsx, con watch mode). Ver el comentario en scripts/dev-node.ts para el detalle de por qué esto es seguro (el handler no usa bindings de Cloudflare como KV o Durable Objects).

4. Probar con curl

El transporte es MCP "Streamable HTTP": todo entra por POST a /mcp como JSON-RPC.

# 1) initialize (obligatorio primero en la mayoría de los clientes)

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 — ver el JSON Schema real que expone cada tool

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 — validar_regex

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":"validar_regex","arguments":{"pattern":"^[0-9]{3}-[0-9]{4}$","test_strings":["555-1234","abc-1234"]}}}'

4) tools/call — validar_cron

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":4,"method":"tools/call","params":{"name":"validar_cron","arguments":{"cron_expression":"0 9 * * 1-5","from_date":"2026-08-07T00:00:00Z","count":5}}}'

5) tools/call — validar_sql

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":5,"method":"tools/call","params":{"name":"validar_sql","arguments":{"query":"SELECT nombre, monto FROM ventas WHERE monto > 100 ORDER BY monto DESC","tables":[{"name":"ventas","rows":[{"id":1,"nombre":"Ana","monto":150.5},{"id":2,"nombre":"Luis","monto":42}]}]}}}'

Las respuestas vienen como Server-Sent Events (una línea event: message + data: {...}); el data: es la respuesta JSON-RPC de siempre.

5. Probar con MCP Inspector (más cómodo que curl)

npx @modelcontextprotocol/inspector

Abre una UI en el navegador. Ahí:

Transport type: Streamable HTTP.
URL: http://localhost:8787/mcp.
Connect → pestaña Tools → List Tools → deberías ver validar_regex, validar_cron y validar_sql con sus schemas.
Elegí una tool, completá los inputs y Run Tool para ver el resultado real.

Deploy y listados

Desplegado en https://regexcronsql-validator.encodari.workers.dev/mcp (Cloudflare Workers). Publicado en el registry oficial de MCP, Smithery, mcp.so y con PR abierto a awesome-mcp-servers.

La mayoría de los cambios de código son solo npm run deploy — no hace falta re-publicar en los listados salvo que cambie el precio, la descripción, o la URL del servidor. Ver ROADMAP.md para el detalle y el plan de mejoras a futuro.

Cómo ver si se está usando

Pagos reales: balance de USDC de la wallet de cobro en BaseScan — cada pago liquidado por x402 aparece ahí.
Tráfico (pagado o no): dashboard de Cloudflare → Workers & Pages → regexcronsql-validator → Metrics.
Smithery: tiene su propia página de stats por servidor.

Qué NO hace (todavía)

Cobra en Base mainnet con dinero real. Para volver a testnet (Base Sepolia, eip155:84532) durante desarrollo, cambiá NETWORK en src/payments.ts.
No tiene base de datos ni estado persistente entre llamadas (más allá de la config de cobro, cacheada en memoria por isolate — ver src/payments.ts).

regexcronsql-validator

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Databases & datasetsi

Common questions

Alternatives

Supabase

MongoDB MCP Server

Elasticsearch MCP Server

README from the maker

regexcronsql-validator

Cobro (x402)

Estructura

Correrlo local

1. Instalar dependencias

2. Correr los tests unitarios

3a. Si tu wrangler dev funciona (macOS 13.5+, Linux, Windows)

3b. Si wrangler dev falla por versión de macOS

4. Probar con curl

2) tools/list — ver el JSON Schema real que expone cada tool

3) tools/call — validar_regex

4) tools/call — validar_cron

5) tools/call — validar_sql

5. Probar con MCP Inspector (más cómodo que curl)

Deploy y listados

Cómo ver si se está usando

Qué NO hace (todavía)

3b. Si `wrangler dev` falla por versión de macOS