"Understanding File Usage" matching MCP servers:

Pay-per-call USDC payment proxy for AI agents. Issue scoped Pay Tokens with hard spending caps and auto-journal every charge to freee / Money Forward / QuickBooks.

A local, read-only stdio MCP server that lets a Grok Build CLI agent check how much of its weekly SuperGrok / Grok Build usage pool is left, when the period resets, and its Extra Usage cap via tools like get_budget. It reads the existing grok login session and returns per-product figures as JSON, mirroring the TUI /usage screen, so agents can pause before expensive work when quota runs low.

Enables querying OpenCode Go subscription quota (rolling, weekly, and monthly usage) and Zen prepaid balance as MCP tools.

Quote, book, and track real LTL, FTL, cargo van, and box-truck freight through the Warp network - 20 tools, in-chat login, Stripe-charged bookings, and real carrier dispatch. Quoting is keyless; booking needs a free Warp account with a card on file.

Enables AI agents to call x402-gated APIs using a central credit balance, abstracting away blockchain complexity and payment proofs. It provides tools to fetch data from payment-required endpoints, check usage balances, and simulate transaction costs.

Integrates usage-based billing into AI coding tools, enabling meter usage, signal verification, and billing management via the ClockNext API.

Enables AI agents to query Paraguayan SIFEN electronic documents, download KuDE PDFs, look up taxpayers by RUC or cédula, check plan usage, and calculate totals with official SET rounding, plus optionally issue invoices, credit and debit notes, and register cancellation, annulment, or nomination events when write mode is explicitly enabled. Runs locally over stdio with the user's own API key and is read-only by default.

Enables agents to price, send, and track encrypted file transfers, with files chunked, encrypted, and hashed locally before any network relay, and to retrieve signed collection receipts. It supports prepaid credit pools and gives agents a privacy-first transfer capability within their own trust domain.

Live market intelligence for AI agents, paid per call in USDC on Base via x402 — no API key or signup. SEC insider trades and insider cluster buying, Polymarket and Kalshi prediction-market odds and 24h movers, 24 US macro indicators with an economic release calendar, and analytics on the x402 agent economy (service rankings, trends, pricing, and a usage-ranked search for paid APIs). Data refreshe

eSIM data plans for 200+ countries: search wholesale plans, check balance and usage, diagnose eSIM connectivity from live network data, and (opt-in) order and top up eSIMs with a confirmation step.

Stateless HTTP MCP service that exposes the Pax8 Partner API as tools for AI assistants to query companies, subscriptions, invoices, orders, products, and usage data.

Enables AI assistants to issue and manage virtual cards, check balances, pull transactions, file disputes, and start KYC via the CardOS API.

Connects MCP-compatible clients and CI pipelines to a hosted endpoint exposing tools for SaaS revenue-leak audits, ghost-usage evaluation, EU VAT validation, B2B net-terms reconciliation, webhook signature verification and replay simulation, dispute-evidence staging/linting, and ROI calculation.

Universal billing gateway for MCP servers. Add Stripe subscription billing to any MCP server with one line of code. Supports tiered plans, usage tracking, and automatic access control.

Connects AI agents to Revenium for cost tracking, alerting, and usage-based billing, enabling AI assistants to manage costs, set alerts, and handle billing operations.

Plans, services, usage, invoices, endpoints and connection checks for your TrueProxies account

Enables AI agents to look up and manage a company's phone lines, usage, invoices, employees, cost centers, and assets, including actions such as blocking lines, changing plans, and porting numbers. Billable actions return a quote and require confirmation before being charged.

Enables AI agents to manage subscriptions, usage-based billing, payments, refunds, tax compliance, and invoicing to drive revenue growth.

An MCP server that acts as a secure, multi-tenant proxy to the InvoiceShelf API, enabling AI assistants to manage invoices, estimates, customers, payments, expenses, and more with 109 tools and TOON compression for efficient token usage.

Enables MCP-capable clients to act as a Salt agent identity to discover and create agents, delegate or consult, chat with humans, post interactive cards, sell products, send invoices, meter usage, manage wallets, and transact on the Salt network via local stdio credentials or hosted OAuth keyless access.

Enables pay-per-call access control for AI agents using HTTP 402 and on-chain settlement, allowing microtransactions for API usage.

MCP server for AI agent billing. Preflight spend checks before agent runs. Post-execution usage billing via two MCP tools: preflight() and record_event().

Deploy and monetize agent-built apps from one MCP. Ship a full-stack app (login, database, usage billing) with one command, then charge the signed-in end user per API call via X-Settle-Payer (end-user-pays: cost times markup, app owner earns the markup).

Enables authenticated remote MCP clients to manage Google Play apps through the Google Play Developer API, with 117 original tools for publishing releases, editing listings, managing testers, and replying to reviews. Adds remote file uploads and persistent background jobs via Google OAuth sign-in and an allowlist.

A production-ready template for building monetized MCP servers that require per-call payments via the Mainlayer infrastructure. It provides a structured payment gate that ensures AI agents pay for tool usage before accessing server logic or data.

Enables users to discover and query multiple AI models, request second opinions or bulk completions, inspect balance and usage, manage referrals and wallet-based keys, and generate configuration for various coding tools.

Enables AI agents to generate, validate, decode, and verify Swiss QR payment slips, with all file writes confined to a specified output directory.

Template for creating MCP servers with a server-side paywall gate, enabling free local usage and premium hosted tier with Stripe and x402 payment lanes.

Enables AI assistants to run a Gumroad store through the API v2, covering product creation, publishing and archiving, file and image management, sales listing and refunds, receipts, subscribers, license keys, offer codes, custom fields, stock, and webhooks. It also scans the public Gumroad storefront by keyword to size a niche (product count, price spread, top sellers) before you launch into it.

Enables AI agents to use paid MCP tools within a human-approved budget by holding a PayPal sandbox authorization, checking each call against policy, recording usage in a durable ledger, and capturing or voiding the authorization at session close.