Discover / hcrb.in

code402

■ Challenge detected

ON-CHAIN COUNTERPARTY PROOF: Audit 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.

Listed price
$0.02
Challenge detected
9 of the last 9 checks
Median response
331 ms
Last checked
16 Oct, 23:40 UTC
In our index since
3 Oct 2026

Endpoint

curl -i https://hcrb.in/v1/tools/settlement-history-check/call
# 402 Payment Required: pay with an x402 client (EURC on Base),
# then send the same request again with the payment attached.
18 listed endpoints · on x402 Bazaar

Checks and payment terms on this page refer to the endpoint above. Other listed endpoints have not been checked individually.

Base URLhttps://hcrb.in/v1/tools

  • POST/settlement-history-check/callNo price listedON-CHAIN COUNTERPARTY PROOF: Audit 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.
  • POST/batch-validate/callNo price listedRun up to 50 supported {tool, value} checks in one request. Each result states its scope. Compare the current batch quote with individual quotes; savings depend on batch size.
  • POST/token-contract-risk/callNo price listedDeterministic Base contract facts: ERC-20 metadata, proxy slots, owner(), privileged-function selectors and flags. Not a safety verdict. Result carries a signed receipt.
  • POST/block-info/callNo price listedBase block header: number, timestamp, transaction count and base fee for the latest or a given block. Result carries a signed receipt.
  • POST/instant-json-schema-verifier/callNo price listedValidate JSON data payloads against schema definitions. Preflighted for agent tool call pipelines.
  • POST/india-supplier-check/callNo price listedOne 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.
  • POST/fx-spot-price-oracle/callNo price listedReference fiat and stablecoin conversion rate from a static table, not a live feed. Returns rate and inverse; result carries a signed receipt.
  • POST/luhn-check/call$0.005Validate any 12-19 digit number by the Luhn mod-10 algorithm. Never submit real payment card numbers. Returns signed XDR-1 receipt.
  • POST/erc20-balance/callNo price listedRaw and formatted ERC-20 balanceOf for an address on Base, with decimals read from the token. Result carries a signed receipt.
  • POST/vendor-onboarding-pack/callNo price listedCheck supplied IBAN, LEI, Belgian VAT and UK company-number fields in one result. Structural checks only; no ownership, registry or fraud clearance.
  • POST/tx-activity/callNo price listedOutbound transaction count (nonce) and contract-or-EOA check for an address on Base. Result carries a signed receipt.
  • POST/context-distill/callNo price listedDeterministic 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.
  • POST/calculate-fx-savings/callNo price listedArithmetic 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.
  • POST/clean-markdown-scraper/callNo price listedFetch a public web page by URL (or take your HTML) and return Markdown plus headings. No JavaScript rendering. Result carries a signed receipt.
  • POST/balance-check/callNo price listedNative ETH and one ERC-20 balance (default USDC) for an address on Base, raw and formatted. Result carries a signed receipt.
  • POST/isbn-check/call$0.005Validate an ISBN-10 (mod-11) or ISBN-13 (1,3-weight mod-10) checksum.
  • POST/gstin-check/callNo price listedValidate an Indian GSTIN by structure (2-digit state code + PAN + entity code + 'Z') and its mod-36 cross-sum checksum.
  • POST/ifsc-check/callNo price listedCheck the 11-character Indian IFSC format, including its fifth-character zero. No bank-branch registry lookup or account verification.

A dash means the listing gives no price or method. Copy buttons copy the full URL.

Showing 18 of 18 listed endpoints.

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/hcrb.in

Recent checks

4 Oct 2026One bar per check, showing up to 20 recent checks. Coloured bars show relative response time, with a minimum visible height; full-height grey bars mean no challenge was detected. “Challenge detected” means HTTP 402 or another detected payment-challenge signal.16 Oct 2026
All 9 checks
When (UTC)ResultHTTPResponse
16 Oct, 23:40 UTCChallenge detected402605ms
15 Oct, 19:10 UTCChallenge detected402222ms
14 Oct, 14:31 UTCChallenge detected402511ms
12 Oct, 10:53 UTCChallenge detected402331ms
10 Oct, 15:44 UTCChallenge detected402166ms
9 Oct, 12:40 UTCChallenge detected402373ms
8 Oct, 09:33 UTCChallenge detected402286ms
7 Oct, 03:32 UTCChallenge detected402358ms
4 Oct, 17:05 UTCChallenge detected402165ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 16 Oct, 23:40 UTC, it returned HTTP 402 or another detected payment-challenge signal. This check did not test payment, delivery or compatibility with the Superstables client.

What price is recorded for code402?

Its listed price is $0.02.

What payment terms does code402 advertise?

The listing advertises x402, Base, EURC and USDC. It names cdp as its facilitator. Check the seller's current payment challenge and authentication requirements before paying.

Where is code402 listed?

In x402 Bazaar and x402-list.com. Superstables first indexed it on 3 Oct 2026.

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