chainverdict.xyz

Screen an EVM address against the US OFAC SDN digital-currency address list at $0.001 — the cheapest sanctions lookup in the ecosystem, Ed25519-signed so you can verify it offline. Exact-list-match, refreshed daily. Screens that one list only — not EU, UN or UK/OFSI — and a non-match is not evidence the counterparty is legitimate. Not a regulated AML/KYT service and does not discharge any legal screening obligation.

Analyse a domain for brand impersonation: homoglyph substitution, character insertion and omission, TLD swaps and known-brand proximity. Returns a suspicion verdict with the specific patterns matched. Heuristic — a match is a reason to check, not proof of intent.

Which AI Act Article 50 transparency controls apply to a given obligation category, with the exemption note and the applicable date. Article 50 has applied since 2 August 2026 and was NOT deferred by the AI Omnibus, which moved only the high-risk obligations.

Check declared transparency controls against the Article 50 category they claim to satisfy, and get back precisely which ones are missing. Checks your assertions, not your system; not a conformity assessment.

Fresh probe of your endpoint plus an Ed25519-signed quality attestation (compact JWS, 24h TTL) you can embed in your 402 responses to raise buyer conversion.

Compute the GS1 check digit for a code body missing it.

Current Base gas conditions: base fee and priority fee in gwei, at a stated block height. For agents deciding whether to transact now or wait.

Structural validation of a draft Due Diligence Statement: required fields, HS-to-commodity consistency, EORI and ISO country formats, quantity units, per-plot geometry, and the deforestation-free cut-off assertion. Explicitly does NOT check deforestation against any satellite dataset and does not file anything.

Structural pre-submission check of a draft CBAM annual declaration: required fields, per-good completeness, CN scope consistency, ISO country format, EU-origin contradictions, reporting-year plausibility, de minimis cross-check. Not a submission and not a validation against the official Registry schema.

Decode a GS1 element string (POST body { data }).

Deterministic HS-code triage: ranked candidate headings with official heading text, GRI note and broker disclaimer. Not a customs ruling.

Profile of a Base address before you transact with it: EOA or contract, first and last seen, transaction and counterparty counts, contract-verification status, and any flags raised. Behavioural signals only — they describe activity, not intent.

Email-authentication posture for a domain: SPF record and policy, DMARC policy and alignment, DKIM selector presence. Use it to judge whether mail claiming to be from a counterparty can be trusted. Live DNS.

Embedded emissions and indicative certificate cost, computed line by line with every arithmetic step echoed back. RegRails supplies no default emission factors on purpose — a stale factor produces a wrong liability — so intensities and certificate price are yours. Indicative only, never a basis for a declaration.

Convert an HTML document to clean Markdown for LLM ingestion: strips scripts, styles and navigation chrome, preserves headings, lists, tables and links. Deterministic for identical input.

Latest Base block: number, timestamp and hash. The cheapest call on the service — useful as a liveness and connectivity check.

Validate a Legal Entity Identifier against ISO 17442: 20 characters, allowed character set and mod-97 check digits. Structural only — no GLEIF registry lookup, so it does not confirm the LEI is issued or active.

Live quality verdict for any x402 endpoint: availability, latency percentiles, 402-offer conformance, price-drift and payTo-stability flags. Deterministic and re-verifiable.

Live TLS probe of a hostname: certificate validity and expiry, issuer, chain completeness, protocol and cipher. Confirms an endpoint you are about to send data to is actually serving a valid certificate right now.

Verify a Base transaction actually did what a counterparty says it did: confirmation depth, success or revert, value, token, sender and recipient. Use it to confirm an inbound payment before releasing goods or data.

Native ETH and ERC-20 token balances for a Base address in one call, read live from chain at a stated block height.

Resolve a GTIN/EAN prefix to its GS1 Member Organisation (not country of origin).

The check to run immediately before an agent sends USDC to an address it did not hard-code. Composite of OFAC SDN screening and on-chain address profiling, returned as clear_to_pay / caution / do_not_pay with the evidence behind it. 'clear_to_pay' means no configured negative signal fired — it is not an endorsement or a guarantee of counterparty legitimacy.

Ranked directory of x402 endpoints by measured live quality (not by on-chain volume). Includes score, grade, latency and pricing per endpoint.

Recent transfer activity for an ERC-20 on Base: transfer count and volume over the sampled window, for judging whether a token is actually in use. Live chain read.

Router-grade bulk quality feed: every tracked endpoint with score, grade, availability, latency percentiles, price, uptime streak and freshness in one pull. Designed for routers/aggregators to ingest.

Safety verdict for an ERC-20 on Base: ownership and mint authority, proxy upgradeability, liquidity and holder concentration, transfer-restriction patterns. Returns hold/caution/avoid with a score and the signals behind it. Heuristic static analysis, not a security audit — a proxy contract can change its implementation after this check.

Is this HS code inside the EU Deforestation Regulation? Returns the commodity (cattle, cocoa, coffee, oil palm, rubber, soya, wood) and the applicable enforcement deadline tier. A simplification package was in trilogue as of the asOf date; deadlines may move.

Is this CN code inside the CBAM Carbon Border Adjustment Mechanism? Returns the sector, whether the 50-tonne de minimis applies, and the declaration deadlines. Longest-prefix match against the bundled Annex I code list — a match is strong, a non-match is weak and never proof of exclusion.

Structural check of a content-credential manifest: claim generator, assertions, the c2pa.actions history, whether a digitalSourceType actually declares trained-algorithmic media, and whether it is signed at all. Does not verify the signature or the certificate chain.

Structured diff of two text blocks: per-line additions, deletions and changes, plus an identical flag. Use it to detect whether a contract, policy or spec changed between two fetches.

Total and circulating supply for an ERC-20 on Base, read live from chain with decimals applied and the block height returned.

Track a year of import lines against the CBAM 50-tonne de minimis and catch the retroactivity trap: crossing the threshold at any point pulls every in-scope import that year into scope, not just the excess. Electricity and hydrogen never benefit from the de minimis and are excluded from the count.

Resolve a token symbol or contract address to the canonical Base contract, so an agent swapping or accepting 'USDC' gets the real one. Catches lookalike and impostor contracts sharing a symbol.

Validate a BIC/SWIFT code against ISO 9362: 8 or 11 characters, bank and country segments, location and branch codes. Structural only; does not confirm the institution is reachable.

Validate a GTIN-8/12/13/14, UPC-A or EAN-13: check digit, format, GTIN-14 normalization, packaging indicator.

Validate an SSCC-18 logistics-unit serial shipping container code.

Validate an ISO 6346 shipping container number (owner, category, serial, check digit).

Validate an IBAN structurally: country length rules, character set and the ISO 7064 mod-97 check. Deterministic. A structurally valid IBAN is not proof the account exists, is open, or belongs to the party you are paying.

Validate an ISIN against ISO 6166: country prefix, 9-character NSIN and Luhn check digit. Structural only; does not confirm the instrument exists or is tradeable.

Validate EUDR plot geolocation: coordinate bounds, ring closure, self-intersection, approximate area, and the rule that plots above 4 hectares require a polygon rather than a point. Catches the [lat, lon] versus [lon, lat] error that silently relocates a plot to the wrong continent.

Validate up to 500 identifiers in a single call — IBAN, VAT, BIC, LEI and ISIN mixed freely. One payment instead of 500, for reconciliation and onboarding runs. Same structural scope as the individual validators.

Validate an IMO ship identification number check digit.

Validate an EU VAT number's structure and per-country check digits. Format only — no VIES lookup, so it does not confirm the registration is active or belongs to the named trader.