Products

x402 Paid API Starter Kit — $79

Express middleware that charges AI agents per API call in USDC using the x402 payment flow.

• Issues HTTP 402 challenges with base64-encoded, machine-readable payment requirements.
• HMAC development verifier plus a facilitator verifier that POSTs to a customer-supplied x402 facilitator.
• Append-only JSONL payment ledger and a /.well-known/x402 manifest endpoint.
• 9/9 end-to-end tests pass (402 → payment → 200; tampered payments rejected).

Non-custodial: the kit verifies payment; it never holds keys or funds and never executes trades.

Buy on Gumroad — $79

MCP Monetization Kit v1.0.1 — $69

Per-tool-call payments for MCP servers.

• createPaidToolRegistry(): registerTool / callTool / listTools with per-call payment enforcement and free quotas.
• Paid tools return machine-readable payment requirements until the caller pays; free tools stay free.
• JSONL usage ledger; adapter for the official @modelcontextprotocol/sdk Server, integration-tested over stdio with a real SDK client.
• Working paid-server and paying-client examples included.

Buy on Gumroad — $69

StableLedger — $49

Offline, zero-dependency Python CLI that organizes stablecoin transaction CSV exports into clean records.

• Parses exchange CSV exports (tested against Kraken-format files), strips X/Z asset prefixes.
• Computes realized profit/loss with simplified average-cost and records fees.
• Fully offline: Python 3 only, no network, no accounts.

Data-organization software. It does not calculate taxes, does not give tax advice, and is not a financial product.

Buy on Gumroad — $49

x402 + MCP Bundle — $119

The x402 Paid API Starter Kit (v1.0.0) and the MCP Monetization Kit (v1.0.1) together — charge per API call and per MCP tool call from one purchase.

Buy on Gumroad — $119

AI Search Readiness Audit — $59

Chrome extension (Manifest V3) that audits the page you are viewing for AI-search readiness.

• Raw-HTML coverage: measures how much visible content exists in the raw HTML (AI crawlers fetch without running JavaScript).
• AI Overviews eligibility: checks meta robots, X-Robots-Tag, and data-nosnippet against Google's documented directives.
• AI-crawler robots.txt matrix: parses the site's live robots.txt against known AI crawlers.
• Dead schema detector: flags retired JSON-LD types such as HowTo and FAQ rich results.
• Export findings to CSV or a print-ready report. 18/18 unit tests pass.

100% client-side. No account, no server, no analytics, no tracking. It reports what your page declares — measurements, not predictions; not SEO advice.

See a real sample report — generated by the actual extension against payloadhq.github.io.

Inside the download: the Chrome extension (Manifest V3), 18/18 passing unit tests, README with install steps, MIT-licensed sample code.

Buy on Gumroad — $59

CRM Dedup & Migration Cleanup Kit — $149

Fully offline deduplication and normalization for CRM data before migration.

• Normalization: emails, E.164 phones, domains, company suffixes, nickname canonicalization.
• Fuzzy matching with confidence tiers, union-find clustering, dry-run merge plans you review before anything changes.
• Import-ready CSV export plus machine-readable change logs (JSON + CSV) with before/after values.
• Ships as a single-file Linux binary, a local web UI, and a CLI. 54/54 tests pass.

Buy on Gumroad — $149

n8n Production AI Agent Reliability Kit v1.0.1 — $99

A production-readiness system for n8n AI agents.

• 10 importable n8n workflow templates covering documented agent failure classes (timeouts, empty results, malformed output, rate limits, runaway loops).
• Node.js eval harness: injects 6 fault classes into your agent model, validates schemas, tests declared fallbacks, scores readiness, and renders JSON/Markdown/HTML reports.
• 37-page production playbook with remediation guidance.

The harness evaluates a JavaScript model of your agent that you write from the documented shape; it does not connect to a live n8n instance. Token-cost figures are simulated estimates, not measured spend.

Buy on Gumroad — $99

MCP Launch Readiness Audit v1.0.1 — $79

A launch-readiness audit system for MCP servers: scanner, fixes, hardened templates, stress tests, CI wiring, report.

• Zero-dependency CLI scanner with 48 detection rules across tool poisoning, hardcoded credentials, server exposure, over-privileged tools, SSRF, and missing auth/hardening.
• Every finding ships with a concrete remediation (code snippet or config change), not just a hint.
• Hardened server templates, a reliability harness that stress-tests under hostile traffic, a deployment readiness verifier, and a branded audit report.

This is an audit, not a certification: it reduces risk but cannot prove the absence of vulnerabilities. Not penetration testing.

Buy on Gumroad — $79