# Devryno

Tiny paid web services for agents.

Website: https://volkov.evgeny.m2.fvds.ru
x402 discovery: https://volkov.evgeny.m2.fvds.ru/.well-known/x402
OpenAPI: https://volkov.evgeny.m2.fvds.ru/openapi.json
Catalog: https://volkov.evgeny.m2.fvds.ru/catalog.json
Sample merchant feed: https://volkov.evgeny.m2.fvds.ru/examples/google-merchant-feed.xml
Free merchant feed preview: https://volkov.evgeny.m2.fvds.ru/free/merchant-feed-preview?url=https://volkov.evgeny.m2.fvds.ru/examples/google-merchant-feed.xml&limit=2
Free Google Merchant feed preview landing: https://volkov.evgeny.m2.fvds.ru/use-cases/free-google-merchant-feed-preview
Free Google Merchant feed preview share kit: https://volkov.evgeny.m2.fvds.ru/share/free-google-merchant-feed-preview.txt
Sample merchant feed audit response: https://volkov.evgeny.m2.fvds.ru/examples/merchant-feed-audit.json
Merchant Feed Audit share kit: https://volkov.evgeny.m2.fvds.ru/share/merchant-feed-audit.txt
Merchant Feed Audit diagnostic order: https://volkov.evgeny.m2.fvds.ru/briefs/merchant-feed-audit-diagnostic-order.txt
Merchant Feed Audit payment checklist: https://volkov.evgeny.m2.fvds.ru/briefs/merchant-feed-audit-payment-checklist.txt
Merchant Feed Audit example cases: https://volkov.evgeny.m2.fvds.ru/briefs/merchant-feed-audit-example-cases.txt
Google Merchant price mismatch docs: https://support.google.com/merchants/answer/9773429?hl=en-GB
Google Merchant structured data docs: https://support.google.com/merchants/answer/7331077?hl=en
Sample batch response: https://volkov.evgeny.m2.fvds.ru/examples/feed-batch-match.json
Google Merchant Center price mismatch use case: https://volkov.evgeny.m2.fvds.ru/use-cases/google-merchant-center-price-mismatch
Commerce schema mismatch use case: https://volkov.evgeny.m2.fvds.ru/use-cases/commerce-schema-mismatch
Feed/page mismatch use case: https://volkov.evgeny.m2.fvds.ru/use-cases/feed-page-match
Crypto USDC tools use case: https://volkov.evgeny.m2.fvds.ru/use-cases/crypto-usdc-tools
Crypto USDC tools share kit: https://volkov.evgeny.m2.fvds.ru/share/crypto-usdc-tools.txt
Base USDC receipt use case: https://volkov.evgeny.m2.fvds.ru/use-cases/base-usdc-receipt
Free Base USDC receipt preview: https://volkov.evgeny.m2.fvds.ru/free/base-usdc-receipt-preview?subjectTx={base-transaction-hash}
Free Base USDC receipt preview landing: https://volkov.evgeny.m2.fvds.ru/use-cases/free-base-usdc-receipt-preview
Base USDC receipt share kit: https://volkov.evgeny.m2.fvds.ru/share/base-usdc-receipt.txt
Base USDC wallet statement use case: https://volkov.evgeny.m2.fvds.ru/use-cases/base-usdc-wallet-statement
Free Base USDC wallet statement preview: https://volkov.evgeny.m2.fvds.ru/free/base-usdc-wallet-statement-preview?wallet={base-wallet-address}&blocks={1-5000}
Free Base USDC wallet statement preview landing: https://volkov.evgeny.m2.fvds.ru/use-cases/free-base-usdc-wallet-statement-preview
Free Base USDC wallet statement preview share kit: https://volkov.evgeny.m2.fvds.ru/share/free-base-usdc-wallet-statement-preview.txt
Base USDC wallet statement share kit: https://volkov.evgeny.m2.fvds.ru/share/base-usdc-wallet-statement.txt
Human Base USDC checkout: https://volkov.evgeny.m2.fvds.ru/buy/merchant-feed-audit
Machine-readable Base USDC quote: https://volkov.evgeny.m2.fvds.ru/quote/merchant-feed-audit?url={public-product-feed-url}&limit={1-10}
Base USDC Receipt checkout: https://volkov.evgeny.m2.fvds.ru/buy/base-usdc-receipt
Base USDC Receipt quote: https://volkov.evgeny.m2.fvds.ru/quote/base-usdc-receipt?subjectTx={base-transaction-hash}&recipient={optional-recipient}&minAmount={optional-usdc-amount}
Base USDC Wallet Statement checkout: https://volkov.evgeny.m2.fvds.ru/buy/base-usdc-wallet-statement
Base USDC Wallet Statement quote: https://volkov.evgeny.m2.fvds.ru/quote/base-usdc-wallet-statement?wallet={base-wallet-address}&blocks={1-50000}&limit={1-100}

Primary paid endpoint:
- Merchant Feed Audit: GET https://volkov.evgeny.m2.fvds.ru/pay/merchant-feed-audit?url={public-product-feed-url}&limit={1-10} - $0.250 USDC on Base. Fetches a public Google Merchant/RSS/Atom/CSV/TSV product feed, parses rows, then checks feed values against each public product page.
- Free Merchant Feed Preview: GET https://volkov.evgeny.m2.fvds.ru/free/merchant-feed-preview?url={public-product-feed-url}&limit={1-3} - free lead-in. Fetches a public product feed and previews parsed rows only; it does not compare product pages.
- Free Base USDC Receipt Preview: GET https://volkov.evgeny.m2.fvds.ru/free/base-usdc-receipt-preview?subjectTx={base-transaction-hash}&recipient={optional-recipient}&minAmount={optional-usdc-amount} - free lead-in. Confirms whether a subject Base transaction contains matching USDC transfer logs, then points to the paid 0.10 USDC receipt checkout.
- Free Base USDC Wallet Statement Preview: GET https://volkov.evgeny.m2.fvds.ru/free/base-usdc-wallet-statement-preview?wallet={base-wallet-address}&blocks={1-5000}&limit={1-3} - free lead-in. Scans a small recent Base block window for wallet USDC activity, then points to the paid 0.25 USDC wallet statement checkout.
- Non-x402 Merchant Feed Audit claim: GET https://volkov.evgeny.m2.fvds.ru/claim/merchant-feed-audit?url={public-product-feed-url}&limit={1-10}&tx={base-transaction-hash} - send 0.25 USDC on Base to 0xdD1729943bf7C408456cef52886ad12B05B57dC2, then paste the transaction hash as receipt.
- Non-x402 Merchant Feed Audit quote: GET https://volkov.evgeny.m2.fvds.ru/quote/merchant-feed-audit?url={public-product-feed-url}&limit={1-10} - returns exact Base USDC payment instructions, wallet payment URI, checkout URL, and claim URL template.
- Base USDC Receipt claim: GET https://volkov.evgeny.m2.fvds.ru/claim/base-usdc-receipt?subjectTx={base-transaction-hash}&recipient={optional-recipient}&minAmount={optional-usdc-amount}&tx={devryno-payment-transaction-hash} - send 0.10 USDC on Base to 0xdD1729943bf7C408456cef52886ad12B05B57dC2, then paste the payment transaction hash to turn the subject transaction into a clean JSON receipt.
- Base USDC Receipt quote: GET https://volkov.evgeny.m2.fvds.ru/quote/base-usdc-receipt?subjectTx={base-transaction-hash}&recipient={optional-recipient}&minAmount={optional-usdc-amount} - returns exact Base USDC payment instructions and claim URL template for the receipt service.
- Base USDC Wallet Statement claim: GET https://volkov.evgeny.m2.fvds.ru/claim/base-usdc-wallet-statement?wallet={base-wallet-address}&blocks={1-50000}&limit={1-100}&tx={devryno-payment-transaction-hash} - send 0.25 USDC on Base to 0xdD1729943bf7C408456cef52886ad12B05B57dC2, then paste the payment hash to receive recent incoming/outgoing USDC totals and transfer rows for the wallet.
- Base USDC Wallet Statement quote: GET https://volkov.evgeny.m2.fvds.ru/quote/base-usdc-wallet-statement?wallet={base-wallet-address}&blocks={1-50000}&limit={1-100} - returns exact Base USDC payment instructions and claim URL template for the statement service.
- Feed Batch Match: GET https://volkov.evgeny.m2.fvds.ru/pay/feed-batch-match?items={url-encoded-json-array-up-to-10-feed-rows} - $0.100 USDC on Base. Compares up to 10 submitted feed rows with public product-page signals and returns per-row evidence plus an overall verdict.
- Feed Page Match: GET https://volkov.evgeny.m2.fvds.ru/pay/feed-page-match?url={public-product-url}&price={feed-price}&currency={feed-currency}&availability={optional-feed-availability} - $0.025 USDC on Base. Compares submitted feed values with public product-page signals from JSON-LD, Open Graph, microdata and visible text.
- Commerce Page Audit: GET https://volkov.evgeny.m2.fvds.ru/pay/commerce-page-audit?url={public-product-url} - $0.025 USDC on Base. Audits Product/Offer JSON-LD, Open Graph and microdata price signals, visible price, availability, canonical URL, robots reachability, and noindex.
- Commerce Schema Fix: GET https://volkov.evgeny.m2.fvds.ru/pay/commerce-schema-fix?url={public-product-url} - $0.050 USDC on Base. Generates a repair plan plus draft schema.org Product/Offer JSON-LD and price meta tags after checking page signals.
- Offer Proof: GET https://volkov.evgeny.m2.fvds.ru/pay/offer-proof?url={public-product-url} - $0.010 USDC on Base. Extracts Product/Offer JSON-LD and compares it with a visible price candidate.

Other endpoints include HTML to markdown, Open Graph extraction, DNS lookup, HTTP headers, RSS parsing, sitemap parsing, JSON-LD extraction, Base gas, ERC-20 metadata, and SHA-256 hashing.