SchemaFetch

Schema-constrained web extract for AI agents. Pass a URL + preset (or JSON schema), get structured JSON back with confidence and source snippets. Pay per call in USDC on Base via x402 — no API keys for buyers.

Separate product from ReceiptStamp. Reuses the same Cloudflare account, CDP facilitator keys, and Base payTo wallet; does not merge codebases.

Live (after deploy): https://schemafetch.panmediatech.workers.dev

API

Presets

saas_pricing · contact · team · product · faq

Example (after payment)

POST /x402/extract
{
  "url": "https://example.com/pricing",
  "preset": "saas_pricing"
}

{
  "data": {
    "plans": [{ "name": "Pro", "price": "$29 / mo", "period": "month", "features": [] }],
    "currency_hints": ["USD"]
  },
  "confidence": 0.7,
  "sources": [{ "field": "plans", "quote": "..." }],
  "fetched_at": "2026-07-11T00:00:00.000Z",
  "cache": "miss",
  "preset": "saas_pricing"
}

Related MCP server: x402 MCP Server

Structure

• src/extract.js — pure extract logic (heuristics + presets)

• src/worker.mjs — Hono Worker + x402 paywall (CDP facilitator)

• mcp/server.mjs — MCP bridge (free tools + paid extract via x402-fetch)

• skills/schemafetch/SKILL.md — agent skill (when/how to call; free install)

• test/ — extract + worker tests (402 without real CDP settlement)

• scripts/bootstrap-x402-payment.mjs — one-time Bazaar first-settlement pay

MCP + skill (distribution, same monetization)

Packaging only — agents still pay the Worker per call. No second price.

You (the seller) do not need to keep npm run mcp open. The product is the live Worker + marketplace listing. MCP is how other people plug SchemaFetch into Claude Desktop / Cursor.

For buyers (your audience)

Step-by-step: mcp/FOR_USERS.md

One-liner config (Claude Desktop / similar hosts):

"schemafetch": {
  "command": "npx",
  "args": ["-y", "github:Fourier18/SchemaFetch", "mcp"],
  "env": {
    "SCHEMAFETCH_BASE_URL": "https://schemafetch.panmediatech.workers.dev",
    "X402_CLIENT_PRIVATE_KEY": "0xYOUR_BASE_PRIVATE_KEY_WITH_USDC"
  }
}

Skill

skills/schemafetch/SKILL.md — instructions agents can load (when to call, presets, budget).

Marketplace (agent HTTP discovery — already live)

https://agentic.market/services/schemafetch-panmediatech-workers-dev

Local

npm install
npm test

Deploy

Same Cloudflare account as ReceiptStamp (panmediatech workers.dev).

# Secrets — file redirect only on this machine (interactive paste can corrupt)
npx wrangler secret put CDP_API_KEY_ID < secrets/cdp_id.txt
npx wrangler secret put CDP_API_KEY_SECRET < secrets/cdp_secret.txt

npx wrangler deploy

Then once, with a funded Base USDC wallet, bootstrap Bazaar indexing:

X402_CLIENT_PRIVATE_KEY=0x... node scripts/bootstrap-x402-payment.mjs

Kill criterion

Zero non-test paid calls by 2026-07-25 = stop funding this product. Listing and self-payments do not count.

Relationship to ReceiptStamp

See PLAN.md for status and deploy notes.

Built with

Human owns product decisions, wallets, and accounts. Stack details also in TOOLS.md.