# Practical Automation Lab — paid commerce-data tools

Base URL: https://pal-nano-catalog-audit.onrender.com
Payment: x402 v2 exact on Base mainnet (eip155:8453), USDC
Seller wallet: 0x02d1DAe81eAdDdeD344eeE43c6f31A8E166432bF
OpenAPI: https://pal-nano-catalog-audit.onrender.com/openapi.json
x402 manifest: https://pal-nano-catalog-audit.onrender.com/.well-known/x402

## Paid tools

### PAL Catalog Feed Identifier Audit
POST https://pal-nano-catalog-audit.onrender.com/v1/usdc/catalog-audit
Price: $0.01 USDC per successful call
Input: {"records":[...]} with 1-100 product records.
Use for deterministic checks of duplicate IDs, GTIN format/checksum, URL shape, price formatting, availability, brand/MPN consistency.

### PAL Single GTIN Check
GET https://pal-nano-catalog-audit.onrender.com/v1/usdc/gtin-check-one?gtin=4006381333931
Price: $0.01 USDC per successful call
Input: one GTIN/UPC/EAN identifier in the gtin query parameter.
Returns normalized identifier, length, expected/actual check digit and validity.

### PAL GTIN Check
POST https://pal-nano-catalog-audit.onrender.com/v1/usdc/gtin-check
Price: $0.01 USDC per successful call
Input: {"gtins":[...]} with 1-100 GTIN/UPC/EAN values.
Returns normalized identifier, supported length, expected/actual check digit and validity.

### PAL Feed Diff
POST https://pal-nano-catalog-audit.onrender.com/v1/usdc/feed-diff
Price: $0.01 USDC per successful call
Input: {"before":[...],"after":[...]} with up to 100 rows per snapshot.
Returns added IDs, removed IDs and structured field-level changes.

### PAL x402 Declaration Validator
POST https://pal-nano-catalog-audit.onrender.com/v1/usdc/x402-validate
Price: $0.05 USDC per successful call
Input: an x402 v2 PaymentRequired object directly, or wrap it as {"declaration":{...}} or {"payment_required":{...}}.
Returns deterministic protocol-shape findings, Base/EVM readiness, amount/address/asset checks, duplicate accepts, and warnings. It never fetches or pays the declared resource.

### PAL Batch Catalog Remediation
POST https://pal-nano-catalog-audit.onrender.com/v1/usdc/catalog-remediation-batch
Price: $5.00 USDC per successful call
Input: {"records":[...]} with 1-500 product records.
Use for larger catalogs when a buyer wants one prioritized Merchant Center/product-feed remediation plan in a single paid call.

### PAL Catalog Remediation Plan
POST https://pal-nano-catalog-audit.onrender.com/v1/usdc/catalog-remediation
Price: $1.00 USDC per successful call
Input: {"records":[...]} with 1-100 product records.
Returns the base audit plus a prioritized Merchant Center/product-feed remediation plan, grouped by issue code and business impact, with concrete corrective actions and affected product IDs.

## Buyer flow
1. POST valid JSON without payment.
2. Read HTTP 402 and PAYMENT-REQUIRED.
3. Satisfy one exact Base-USDC requirement.
4. Retry the identical request with PAYMENT-SIGNATURE.
5. Read the JSON result and PAYMENT-RESPONSE.

These are deterministic commerce-data utilities. They do not modify stores, require merchant credentials, or use an LLM.