Prototype · Preview: every server in the official registry, synced every 30 minutes. Reviews and accounts come in a later step.
PopNx MCPMCP servers for people who use AI · explained in plain words
Beginner mode On
ColoursSystemLightDark
LanguageไทยEnglish中文日本語한국어EspañolDeutsch
☰ MenuSettings
Beginner mode On
ColoursSystemLightDark
LanguageไทยEnglish中文日本語한국어EspañolDeutsch

PrepLayer.ai

by maximusboomerus-afkversion 0.2.1i★ –iRuns in the cloud
Registry namecom.maximusmediahouse/preplayer

Install

Overview

Description from the maker (original English)

Deterministic text prep for agents. Pay per call via x402 USDC.

PopNx MCP’s three pillars

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

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.

Install

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

Before you install

You need

Which app do you use?

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

Works in Claude on the web, desktop and mobile:

  1. Open Settings → Connectors
  2. Press Add custom connector
  3. Paste the address below and press Add
  4. If it asks you to sign in, sign in with the maker
SettingsConnectors1+ Add2https://…3
https://api.maximusmediahouse.com/mcp

Run this in your terminal

claude mcp add --transport http preplayer https://api.maximusmediahouse.com/mcp

Open in Cursor

Or copy the settings yourself

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

{
  "mcpServers": {
    "preplayer": {
      "url": "https://api.maximusmediahouse.com/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": {
    "preplayer": {
      "type": "http",
      "url": "https://api.maximusmediahouse.com/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:

  1. Open ChatGPT on the web → Settings → Connectors (Apps)
  2. Press Create or Add (some plans need Developer mode under Advanced first)
  3. Paste the address below, give it a name and save
  4. If it asks you to sign in, sign in with the maker
SettingsConnectors1+ Create2https://…3
https://api.maximusmediahouse.com/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

Tool names and descriptions exactly as the server reported them on Nov 7, 2026. The maker wrote them, not us; we show them as plain text.

  • normalize

    Deterministic text normalization: Unicode NFKC, zero-width/bidi stripping, smart-quote and dash folding, whitespace collapse, case folding. Returns a stable content hash so two texts can be compared for exact equality. $0.002 USDC per successful call (x402, client-paid); failed c

  • validate

    Validate and canonicalize one identifier: email, URL, E.164 phone, IBAN (mod-97), payment card (Luhn), UUID, SHA-256, git SHA, EVM address (EIP-55) or domain. Returns {valid, canonical, fingerprint}. $0.002 USDC per successful call (x402, client-paid); failed calls are not charge

  • extract

    Extract structured fields from unstructured text with byte offsets and normalized values: emails, URLs, IPv4, phones, money amounts, ISO dates, UUIDs, EVM addresses, SKUs, semver. $0.005 USDC per successful call (x402, client-paid); failed calls are not charged.

  • redact

    Redact PII from text before it is stored or logged. Returns redacted text plus exact byte spans and counts per class: credit_card, iban, email, private_key, evm_address, phone, ipv4, url. $0.005 USDC per successful call (x402, client-paid); failed calls are not charged.

  • classify

    Rule-based multi-label text classification over a fixed taxonomy (urgency, financial_promise, credential_request, crypto_mention, cta, legal_offer, medical_claim, seo_spam, url_shortener, press_release, question, has_contact). Deterministic - identical text always yields identica

  • dedupe

    Near-duplicate detection across a batch of documents. Exact Jaccard similarity over word-3-shingle sets decides duplication; a 64-bit SimHash is returned per document as a compact content fingerprint. Up to 200 documents per call. $0.01 USDC per successful call (x402, client-paid

  • diff

    Line-level LCS diff of two text blobs. Returns a structured edit script with insertions, deletions, unchanged line counts and per-operation metadata; with format='unified' also returns a unified-diff string. $0.005 USDC per successful call (x402, client-paid); failed calls are no

  • chunk

    Split long text into pieces for RAG retrieval. Strategies: 'sentence' packs whole sentences into a size budget and never splits mid-sentence; 'paragraph' prefers \n\n boundaries; 'fixed' is a hard char window with overlap. The highest-value endpoint for agents that build retrieva

  • extract_custom

    Pull caller-defined structured fields from text using regex patterns with deterministic type coercion. Supported types: string, bool, date, url, email, number. Returns {fields: {name: value|null}, found, missing}. Pure deterministic — no LLM call. $0.005 USDC per successful call

  • validate_json

    Deterministic JSON-Schema subset validator. Catches malformed JSON before it breaks a pipeline. Supports: type, required, properties, items, minLength, maxLength, pattern, enum, minimum, maximum, additionalProperties. No external dependencies. $0.003 USDC per successful call (x40

  • slugify

    URL-safe slug from arbitrary text. NFKD-decomposes unicode (é -> e), lowercases, replaces every non-[a-z0-9] run with a separator, strips leading/trailing separators, truncates on separator boundaries (never mid-word). $0.002 USDC per successful call (x402, client-paid); failed c

  • hash

    Content-addressable hashing for caching and dedup. Three algorithms: sha256 (via node:crypto / Web Crypto), xxhash64 and murmur3 (inline pure-JS, deterministic across runs). Returns hex digest + algorithm + byte count. $0.002 USDC per successful call (x402, client-paid); failed c

  • batch

    Run up to 10 primitive calls in one round trip for one x402 payment of $0.02 (= $0.0020 per call, below the priciest single-call route at $0.01). Each request names an `endpoint` (normalize, validate, extract, redact, classify, dedupe, diff, chunk, extract_custom, validate_json,

  • batch50

    Run up to 50 primitive calls in one round trip. One x402 payment of $0.075 (=$0.0015 per call — cheaper per call than the 10-slot batch). Same `{endpoint, input}` request shape as /v1/batch; the response carries up to 50 results in order. Built for a production buyer running a wh

  • batch100

    Run up to 100 primitive calls in one round trip. One x402 payment of $0.100 (=$0.0010 per call — the deepest rung of the batch ladder, cheaper per call than the 10- and 50-slot batches). Same `{endpoint, input}` request shape as /v1/batch. The volume mechanic for a corpus-holding

  • subscription

    Recurring tier: a PREPAID CALL BALANCE. One x402 payment of $1.00 credits 1,000 units of prepaid capacity (= $0.0010 per call), drawn down across sessions on the cheap deterministic routes (<= $0.01). The funded balance is the source of truth, queryable at GET /v1/subscription/ba

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

  • ! Caution

    Maker matches the repo

    The publisher (maximusmediahouse.com) is not the repo owner (maximusboomerus-afk); someone else may have listed it

  • … 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

  • ✓ Pass

    Endpoint responds

    Responded in 318 ms (HTTP 200)

  • – Not applicable

    Sign-in with OAuth

    No sign-in needed

  • ✓ Pass

    No hidden instructions in tool descriptions

    Read 16 tool descriptions and found no hidden instructions to the AI

Compared with others in Otheri

  • More stars than 0% of the other 18348 servers in this category
  • Published to the registry more recently than 79% of the other 18348 servers in this category
  • Basic checks equal to or better than 36% of the other 18348 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 PrepLayer.ai safe?

It passed 2 of 3 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 (0.2.1) reached the registry 11 days 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: Spec Driven Development, Remote Desktop Commander, 好縮 Short

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

Spec Driven Development

by formulahendry

MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.

Runs on your computer★ 440MITUpdated 14 months ago
Install

Remote Desktop Commander

by desktop-commander

Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.

Runs in the cloud★ 211Updated 2 days ago
Install

好縮 Short

by gooonamee

Smart URL shortener: create, tag and track short links on s.gooo.name.

Runs in the cloudUpdated today
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.

PrepLayer.ai

Twelve x402-paid deterministic text primitives for AI agents.

Pay per call in USDC. No API keys, no accounts, no signup.

Base URL: https://preplayer.maximusboomerus.workers.dev Mirror URL (production): https://api.maximusmediahouse.com MCP endpoint: https://preplayer.maximus-boomerus.workers.dev/mcp (streamable-http, POST) Service version: 0.2.0

What this is

PrepLayer is a single Cloudflare Worker exposing twelve deterministic text prep primitives behind one MCP server. Each call costs a few cents in USDC and is paid for on the wire via the x402 protocol — the agent signs a TransferWithAuthorization (EIP-3009) against USDC, the Worker verifies the signature with the Coinbase Developer Platform facilitator, and the call runs.

The primitives are the boring text work an agent has to do before it can think: normalize whitespace, validate an identifier, hash content for a cache key, dedupe a document set, redact PII before logging, chunk for RAG, diff two blobs. Each primitive is pure — identical input always produces identical output — so results are content-addressable and safe to cache.

What's not in this repo

The MCP server and Worker source live in a private working tree. This repo is the public landing surface: discovery, manifest, license, security contact, and a small example showing how a payer actually executes a paid call. If you want to self-host the worker, see docs/METHODOLOGY.md for what you'd need to stand up — none of the secrets are here on purpose.

Endpoints

Every paid endpoint is POST and gated with x402. The first call without payment returns 402 Payment Required with a PAYMENT-REQUIRED header (base64 JSON) and a PAYMENT-REQUIRED JSON body describing the challenge. The second call carries a PAYMENT-SIGNATURE header (base64 JSON) and returns 200.

Twelve text primitives
EndpointPathSingle price (Base)Per call
normalize/v1/normalize$0.0022 000 atomic units
validate/v1/validate$0.0022 000 atomic units
slugify/v1/slugify$0.0022 000 atomic units
hash/v1/hash$0.0022 000 atomic units
classify/v1/classify$0.0033 000 atomic units
validate_json/v1/validate_json$0.0033 000 atomic units
extract/v1/extract$0.0055 000 atomic units
redact/v1/redact$0.0055 000 atomic units
diff/v1/diff$0.0055 000 atomic units
chunk/v1/chunk$0.0055 000 atomic units
extract_custom/v1/extract_custom$0.0055 000 atomic units
dedupe/v1/dedupe$0.0110 000 atomic units

Prices on Polygon and Arbitrum One are ×1.2; prices on Base, Base Sepolia, and Solana mainnet are ×1.0. Atomic units are 6-decimal USDC.

Three additional endpoints
EndpointPathPriceStatus
batch/v1/batch$0.40 / 10 calls ($0.04 each)real — single x402 payment, up to 10 sub-requests
subscription/v1/subscription$200 / 10 000 calls / monthspec only — returns 501; the design is documented in docs/METHODOLOGY.md, will not charge real USDC until the D1 store is in place
priority/v1/priorityn/aspec only — returns 501; we will not charge 2× for a latency SLA we cannot guarantee on a single-instance Worker
Free endpoints (never charged)
PathPurpose
/.well-known/x402x402 Bazaar service descriptor (15 resources, networks, prices)
/v1/manifest.jsonMCP tool list with full JSON-Schema and per-network pricing
/server.jsonMCP registry manifest (this file's companion)
/landingHTML landing page
/llms.txt, /llms-full.txtPlain-text references for LLM crawlers
/robots.txt, /bazaar-extension.jsonDiscovery aids

Payment flow

PrepLayer is paid through x402 — HTTP's 402 Payment Required made useful. The wire:

  1. POST an endpoint with the tool's JSON body and no payment header. The server returns 402 with a PAYMENT-REQUIRED header (base64 JSON challenge) describing the scheme, network, asset, amount, treasury address, and an EIP-712 domain.
  2. The caller signs an EIP-3009 TransferWithAuthorization message against the USDC contract on the selected network and base64-encodes the resulting PaymentPayload into a PAYMENT-SIGNATURE header.
  3. POST again with that header. The server verifies the signature with the CDP facilitator (https://api.cdp.coinbase.com/platform/v2/x402), executes the tool, and returns 200 with a PAYMENT-RESPONSE header containing the settlement receipt.

The v2 protocol on the wire:

  • Header on 402: PAYMENT-REQUIRED (base64 JSON; lowercase header name as the Worker emits it).
  • Header on 200: PAYMENT-SIGNATURE (base64 JSON; ditto).
  • Header on 200 (settle receipt): PAYMENT-RESPONSE (base64 JSON).
  • Scheme: exact. Networks: eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp, eip155:137, eip155:42161, eip155:84532 (Base Sepolia, test only).
  • Asset: USDC.
  • Treasury: 0x8cb59b1bffb39c130ab85a8177e93eae9ddbaf10.
  • Facilitator: https://api.cdp.coinbase.com/platform/v2/x402 (Coinbase Developer Platform; the path matters — /v2/x402 404s and is the wrong URL).
Example: probe-only (no payment required)

The probe below is always safe to run — it returns the 402 challenge and never spends anything. Use it to verify connectivity, the treasury address, and the per-network price.

curl -i -X POST https://preplayer.maximus-boomerus.workers.dev/v1/normalize \

-H 'content-type: application/json' \ --data '{"text":"Hello\u200b, World!"}'

The response is HTTP/2 402, with:

PAYMENT-REQUIRED: eyJ4NDAyVmVyc2lvbiI6...

Decoded, the body is a JSON object describing the accepted (scheme, network, amount, asset, payTo). See examples/probe.mjs for a runnable version that decodes the base64 challenge and prints it.

Example: a paid call (Node.js, viem + @x402/core/evm)

The real paid flow needs a wallet — there is no honest way to do it with bare curl. examples/paid-call.mjs shows the verified-working pattern (EIP-3009 signing via @x402/evm/exact/client, header encoding via @x402/core/client's x402HTTPClient.encodePaymentSignatureHeader). To run it:

npm install viem @x402/core @x402/evm

PAYER_PRIVATE_KEY=0x<64 hex chars> node examples/paid-call.mjs

The script signs a single call to /v1/dedupe, prints the first 18 chars of the EIP-712 signature (never the key, never the full signature), and prints the PAYMENT-RESPONSE settlement receipt on success. The same machinery handles the other 11 primitives and batch.

Never commit, log, or paste your `PAYER_PRIVATE_KEY`. A leaked private key is unrecoverable loss of USDC.

MCP install

Any MCP client that supports streamable-http can drive PrepLayer by pointing at:

https://preplayer.maximus-boomerus.workers.dev/mcp

The server returns the full tool list (normalize, validate, extract, redact, classify, dedupe, diff, chunk, extract_custom, validate_json, slugify, hash, batch, subscription, priority) on tools/list. Each tool call goes through x402 like any other HTTP call — the MCP layer is a thin transport.

If you are writing your own MCP client: the initialize handshake is JSON-RPC 2.0 over HTTP POST with Content-Type: application/json and Accept: application/json, text/event-stream. tools/call is a paid request that returns the same 402 / PAYMENT-SIGNATURE round-trip as the bare HTTP path.

Known limitations (read this)

This service is honest about what it is and what it isn't.

1. The character-fidelity ceiling is approximately 6.5 out of 10

normalize, slugify, and extract do Unicode folding to a fixed ASCII surface. That's the whole point — content hashes stay stable across whitespace, smart-quote, and accent variants — but it means we strip diacritics, we don't preserve them round-trip. "naïve café" becomes "naive cafe". If you need Unicode-preserving normalization (e.g. NFKC without NFKD), this is the wrong tool.

2. Two tiers are spec-only, not live

subscription ($200 / 10 000 calls / month) and priority (X-Priority: high, no published price) both return 501 Not Implemented today. The manifest advertises them so x402 directories render the full tier ladder, but the Worker has no D1 store backing subscriptions and no SLA behind the priority tier. Do not pay into either yet — the server will refuse the call regardless of whether the signature is valid.

3. Single-instance Worker, no SLA

One Cloudflare Worker, no Durable-Object-backed request queueing. Latency P99 is unmeasured but the Worker can be cold-started after a deploy, and a single misbehaving caller can pin a CPU slot for several seconds on extract_custom with a malicious regex (we have a static guard and a 10 KB subject cap, but no economic rate limit beyond that). Treat this as a beta: useful for research workloads, not yet a fit for time-sensitive production pipelines.

4. CDP facilitator dependency

Settlement goes through Coinbase Developer Platform's x402 endpoint. If the CDP facilitator is down, every paid call will 503 regardless of how good the signature is. We have no in-process fallback. Mirror status: https://status.coinbase.com/.

5. No replay window other than the per-payload nonce

A successfully-paid call cannot be replayed against the same endpoint (the Worker uses a Durable Object keyed by payment nonce, exactly-once under concurrency), but the same signed payment can be replayed once per Worker instance across different endpoints if the JSON body changes to fit. If you fork this for production, add a per-tool-keyed replay set on top of the per-payload nonce.

6. Receipt contents have changed once and may change again

Between 0.1.0 and 0.2.0 the receipt field list moved (the facilitator field used to read "mock-cdp" during Phase 1; it now reads the real facilitator URL). Anything that scrapes receipts and pins the field names needs an update if the settlement envelope changes in a future minor version.

Discovery

These URLs never charge and never rate-limit:

Status

The Worker is in 0.2.0. It was red-teamed (preplayer_redteam_2026-10-19.md in the project notes) before paid real USDC was accepted; the payment bypass, replay, ReDoS, and price-tier findings are closed. Two P3 items (HEAD → 404 not 405, duplicate 402 in MCP structuredContent) remain open. The Worker has been serving real EIP-3009-signed USDC calls against the CDP facilitator since Phase 2.

License

MIT — see LICENSE. Service source is private; this repo and the endpoints it documents are MIT.

Ask PopNx