Chainverdict

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.

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

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

Base gas price oracle: current gas cost on Base, base fee and priority fee in gwei, at a stated block height. For agents deciding whether to transact now or wait.

API uptime and reliability monitoring for any x402 endpoint: a live quality verdict covering availability, uptime, latency percentiles, 402-offer conformance, price-drift and payTo-stability flags. Deterministic and re-verifiable.

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

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

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 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 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.

The complete daily observation history of third-party x402 endpoints since first observation, with the Merkle root of each day. Each root is chained to the previous day and timestamped into Bitcoin via OpenTimestamps, so the archive can be verified as having existed on the stated dates rather than assembled later. The most recent 7 days are free at /v1/datasets/day/{day}; the manifest and verification method are free at /v1/datasets/manifest.

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.

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.

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

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.

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.

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.

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

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

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

Validate an IMO ship identification number check digit.

x402 endpoint quality rankings: a ranked directory of x402 APIs by measured uptime and reliability rather than on-chain volume. Includes score, grade, latency and pricing per endpoint.

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.

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.

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.

Token safety check for an ERC-20 on Base: is this token a scam, a honeypot, or safe to hold? Examines 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.

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 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 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.

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.

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.

Wallet risk profile for a Base address before you pay it or accept payment from 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.