hcrb.in x402 offerings

Offline deterministic checks (no ML, no scraping) for business identifiers and rental due-diligence, paid per call via x402 (gasless EIP-3009 USDC on Base). Checksum-verifiable (IBAN, LEI, VAT, ABA, ISBN, SEDOL…) vs format-only (EIN, IFSC, SWIFT/BIC…) — every response returns a scope field. Non-custodial, signed receipts. First 3 calls/day free.

Offline deterministic checks (no ML, no scraping) for business identifiers and rental due-diligence, paid per call via x402 (gasless EIP-3009 USDC on Base). Checksum-verifiable (IBAN, LEI, VAT, ABA, ISBN, SEDOL…) vs format-only (EIN, IFSC, SWIFT/BIC…) — every response returns a scope field. Non-custodial, signed receipts. First 3 calls/day free.

Outbound transaction count (nonce) and contract-or-EOA check for an address on Base. Result carries a signed receipt.

Validate JSON data payloads against schema definitions. Preflighted for agent tool call pipelines.

Check the 11-character Indian IFSC format, including its fifth-character zero. No bank-branch registry lookup or account verification.

Validate an Indian GSTIN by structure (2-digit state code + PAN + entity code + 'Z') and its mod-36 cross-sum checksum.

Raw and formatted ERC-20 balanceOf for an address on Base, with decimals read from the token. Result carries a signed receipt.

Deterministic text digest: word count, top-5 most frequent meaningful words (stop words excluded), first sentence, and a keccak-256 content hash. Pure function — no external calls, no ML.

Arithmetic comparison of a USDC settlement against comparator percentages YOU supply (bank_fee_pct, custodial_fee_pct) across 14 global fiat currencies. The comparators are assumptions, not measurements of any bank or provider; no protocol fee is deducted on this rail.

Native ETH and one ERC-20 balance (default USDC) for an address on Base, raw and formatted. Result carries a signed receipt.

Reference fiat and stablecoin conversion rate from a static table, not a live feed. Returns rate and inverse; result carries a signed receipt.

Base chain (8453) block header data: block number, timestamp, transaction count and base fee for any block. Result carries a signed receipt.

Validate any 12-19 digit number by the Luhn mod-10 algorithm. Never submit real payment card numbers. Returns signed XDR-1 receipt.

Validate a book or publication ISBN-10 (mod-11) or ISBN-13 (1,3-weight mod-10) check digit and barcode identifier format.

One call, one receipt: GSTIN + PAN + UPI VPA + IFSC for an Indian counterparty. Four deterministic structural checks, each stating its own scope. Built for cross-border procurement where the buyer is an agent that cannot open an INR account.

Check supplied IBAN, LEI, Belgian VAT and UK company-number fields in one result. Structural checks only; no ownership, registry or fraud clearance.

Validate up to 50 tax, bank and legal-entity identifiers (IBAN, LEI, VAT, SWIFT/BIC, ABA routing, EIN, IFSC, ABN, GSTIN, ISIN, SEDOL, EAN-13, ISBN, E.164 or Luhn checks) in one batch request. Each result states its scope. Compare the current batch quote with individual quotes; savings depend on batch size.

Fetch a public web page by URL (or take your HTML) and return Markdown plus headings. No JavaScript rendering. Result carries a signed receipt.

Deterministic Base contract facts: ERC-20 metadata, proxy slots, owner(), privileged-function selectors and flags. Not a safety verdict. Result carries a signed receipt.

ON-CHAIN COUNTERPARTY PROOF: Review USDC transfers sent and received by any EVM address over the last ~48h of Base blocks. Preflighted so you never pay during an RPC outage.

code402 iban-check

Outbound transaction count (nonce) and contract-or-EOA check for an address on Base. Result carries a signed receipt.

Validate JSON data payloads against schema definitions. Preflighted for agent tool call pipelines.

Check the 11-character Indian IFSC format, including its fifth-character zero. No bank-branch registry lookup or account verification.