--- title: "Subcent402 · The Global M2M Micro-Payment Protocol & MCP Tool Marketplace" source_url: "https://subcent402.com/contact" canonical_url: "https://subcent402.com/contact" retrieved_by: "AnswerRail Edge Engine v1.1.0-parity-v20 (https://answerrail.com)" provenance: "Compiled for deterministic AI retrieval by AnswerRail Edge (RFC 9110 / RFC 9421)" description: "Subcent402 is the open sub-cent financial rail for AI agents. Monetize any MCP tool or API in 3 lines of code. Publish to the global directory and earn per call." rfc_compliance: "RFC 9110 / RFC 9309 / RFC 9421" version: "1.1.0" release_version: "v1.1.0-parity-v20" signing_kid: "ar_ed25519_2026_k1" jwks_uri: "https://answerrail.com/.well-known/http-message-signatures-directory" edge_network: "Cloudflare Workers Anycast (330+ Global PoPs)" verified_latency: "<15ms (Warm Edge Cache HIT) / 80-250ms (Cold AST Compile)" --- > **Canonical Source:** [https://subcent402.com/contact](https://subcent402.com/contact) > > *Subcent402 is the open sub-cent financial rail for AI agents. Monetize any MCP tool or API in 3 lines of code. Publish to the global directory and earn per call.* # The Universal Micropayment Standard. Equip Autonomous Agents with Live Tools for Fractions of a Cent. The open M2M payment protocol for Claude Desktop, Cursor, and enterprise LLM loops. Settle live paid MCP tools in sub-cent fractions with zero credit card friction, zero subscriptions, and client-side BudgetGuard safety. ## The Subcent402 Official Starter Pack Equip your agent with 4 essential tools in a single command: **TokenMarkdown**, **TokenEnrich**, **SEC Edgar Parser**, and **TokenVerify**. Includes $1.00 free sandbox credits. ## Test Any Tool Live with Subcent402 Select any MCP tool, provide test arguments, and watch autonomous sub-80ms micro-settlement execute live. ## Pre-Funded Agent Credit Vaults Equip your agent fleets with instant working capital. Zero transaction delays, auto-refills, and bonus execution credits. Ideal for individual developers running Claude Desktop or Cursor. - $50.00 In-Vault Balance - ~50,000 Tool Invocations - Auto-Refill Threshold Alerts For AI agent agencies and production developer teams. - **$260.00 Total Credits** (+$10 Bonus) - ~260,000 Tool Invocations - Multi-Agent BudgetGuard Policies - 1-Click Slack Approval Webhooks For multi-agent corporate deployments and enterprise compliance. - **$1,050.00 Total Credits** (+$50 Bonus) - Priority Global 300+ Edge Routing - SOC2 Cryptographic Non-Repudiation Logs ## Discover & Invoke Paid Tools Autonomously A global directory of production-ready MCP tools published by community creators and verified developer suite partners. ### SEC 10-K & 8-K Parser Instant vector-ready JSON extraction of SEC EDGAR 10-K, 10-Q, and 8-K filings by QuantData Labs. ### TokenMarkdown Engine Sub-150ms Web-to-Markdown engine stripping 95% of HTML/SVG DOM noise to slash LLM token bills. ### Ephemeral Python GPU Sandbox Sub-second disposable cloud sandbox to run untrusted Python code, PyTorch models, and data science safely. ### TokenEnrich Signals 180-token B2B firmographics & live DNS/TLS wire resolvers. Eliminates 70% of Apollo/Clay waterfall waste. ### GitHub PR & CVE Security Scanner Automated vulnerability scanner checking incoming PRs against 240,000+ known CVEs by SecOps Dev. ### Publish Your MCP Tool Monetize your code in 60s. Collect micropayments directly to your wallet from 50,000+ AI agents worldwide. ## Stripe Base Surcharges vs. Subcent402 Savings Why Stripe's $0.30 fixed surcharge breaks micro-agent economics—and how Subcent402 eliminates billing waste. ## Turn Any API or Code Function into Instant Revenue Zero customer accounts to manage. Zero credit card checkout forms. Keep 98.5% of every transaction paid directly to your wallet. ### 3-Line Integration Wrap any TypeScript or Python function with `@withSubcent402`. Zero database or server setup required. ### Instant Non-Custodial Payouts Funds route directly P2P into your Base USDC or Lightning wallet. Zero minimum payout thresholds. ### Global Agent Discovery Published tools are indexed in `/llms.txt` and auto-discoverable by Claude Desktop, Cursor, and LangChain agents. ## Claude Desktop & Cursor Config Generator Select your active tools, configure your daily spending limit, and copy the ready-to-run configuration block. ### 1. Select Active Tools: ### 2. BudgetGuard Daily Limit (USD): ## 3 Lines of Code. TypeScript & Python. Drop into any Model Context Protocol tool, FastAPI endpoint, or REST API with sub-0.2ms offline HMAC verification. ## Zero Subscriptions for Agents. Managed Edge for Teams. Agents pay per tool call on the wire. Hosted Gateway SaaS available for enterprise fleet governance. Self-hosted open source SDKs. - Full `@subcent402/sdk` & Python SDK - Stateless Offline HMAC Verifier (<0.2ms) - Local BudgetGuard & Session Passes Global edge routing on Cloudflare Workers. - Global 300+ Region Edge Settlement - 1.0% Reduced Protocol Routing Fee - Real-Time Spending Analytics & Webhooks - 1-Click Slack / Browser HITL Webhooks Multi-agent fleet management & compliance. - Dedicated Single-Tenant Edge Gateway - SOC2 & Audit Non-Repudiation Logs - Team-Wide Multi-Agent Budget Policies - Dedicated 24/7 SLA & Engineering Support ## Frequently Asked Questions Everything you need to know about sub-cent agent tolls, stateless Macaroon cryptography, and non-custodial payouts. ### Why can't we use traditional Stripe, Visa, or PayPal for AI agents? Stripe charges a fixed `$0.30 base fee + 2.9%` on every transaction. If an autonomous agent invokes an MCP tool that costs `$0.002`, Stripe's fixed fee is 150x the cost of the actual tool! Subcent402 enables true sub-cent tolls (`$0.001 – $0.01`) with a flat 1.5% protocol routing fee and 0% base surcharge. ### Do agents or users need to create accounts or generate static API keys? No. Subcent402 implements programmatic L402 / HTTP 402 macaroons. Tools return `MCP_ERROR(-32042)` with a cryptographic challenge; the agent client auto-settles the challenge in <80ms and attaches the preimage proof in `_auth_l402`. Zero human signup forms or OAuth browser redirects. ### How do we prevent runaway AI loops from draining corporate budgets? `@subcent402/client` includes `BudgetGuard`, enforcing hard daily spend caps (e.g. `$5.00/day`), per-call limits (`$0.05/call`), and 1-click human-in-the-loop (HITL) approvals via Slack/Discord webhooks whenever an action exceeds safety thresholds. ### Which payment rails and currencies are supported? Subcent402 natively supports **Base USDC** (L2 smart contract with EIP-712 Permit) and **Bitcoin Lightning Network** (BOLT11 / LNURL). For developers who want zero crypto exposure, we provide **Pre-Funded Virtual Credit Vaults**. ### Does validating a payment add latency to tool calls? No. Tool servers verify Macaroon HMAC-SHA256 signatures **statelessly and offline in <0.2ms**. Zero database queries or network roundtrips required on the verifier side. ### How do tool creators publish and receive payouts? Wrap your TypeScript or Python function with `@withSubcent402`, specify your price (`$0.001 – $0.05`) and payout wallet. Payouts route non-custodially directly to your wallet with zero minimum withdrawal thresholds. ## Start monetizing and invoking MCP tools in under 60 seconds. $1.00 free sandbox credits included. Zero credit card required. Drop into Claude Desktop, Cursor, Python, or FastAPI immediately. --- ## 🏛️ AI Ingestion & Edge Optimization Provenance This sovereign authority subpage is compiled and delivered across 330+ Cloudflare Anycast edge locations by [AnswerRail](https://answerrail.com) for [https://subcent402.com/contact](https://subcent402.com/contact).