# ChainVerdict
> Evidence-backed checks an autonomous agent runs before a proposed payment.
> Profile a recipient address, verify a token is canonical, confirm a payment settled,
> validate an IBAN/VAT/BIC/LEI/ISIN, or check a domain's email/TLS posture — in one call, with no account.
>
> Every paid response carries a machine-readable _evidence object: checksPerformed, dataSources, freshness
> (with explicit stale-data risk), an ordinal assurance level, limitations, and whether human approval is recommended.
> Assurance is ordinal, never numeric: a number would imply a calibration that has not been performed.
> Responses carry an Ed25519 signature in an x-signature header over canonical JSON + '|' + x-signed-at;
> the public key is base64 SPKI at /.well-known/signing-key.json, which states the exact recipe. This is not
> the compact-JWS form the other services use; https://pulse.chainverdict.xyz/verify checks both forms.
> Methodology is public and free to read: https://chainverdict.xyz/v1/methodology
>
> Honest scope: these are informational signals for decision support. They are NOT regulated financial, legal or
> compliance advice, and the absence of a negative signal is never a guarantee of safety.
>
> Billing is per call in USDC on Base (x402) — no API keys, no signup, no subscription.

## Product focus
Pulse observation evidence is the active experiment: https://pulse.chainverdict.xyz/evidence.html
These generic ChainVerdict routes are maintained; they are not a demonstrated moat.
TradeRails remains available in maintenance, with retirement under review: https://trade.chainverdict.xyz/retirement.json

## Input privacy
Identifier GET routes put the submitted value in the URL. URLs can appear in browser history and intermediary logs. Do not send sensitive account details merely to try the service; prefer local validation when confidentiality is required.

## Paid endpoints (x402, USDC on Base)
- GET https://chainverdict.xyz/v1/token/verdict/{address} — token safety verdict on Base, $0.01
- GET https://chainverdict.xyz/v1/wallet/dossier/{address} — wallet profile, $0.01
- GET https://chainverdict.xyz/v1/data/gas — live Base gas oracle (base fee, priority fees, congestion), $0.002
- GET https://chainverdict.xyz/v1/data/block — latest Base block info & utilization, $0.001
- GET https://chainverdict.xyz/v1/data/supply/{token} — token supply & burn distribution on Base, $0.003
- GET https://chainverdict.xyz/v1/data/activity/{token} — recent transfer count/volume/unique wallets, $0.005
- GET https://chainverdict.xyz/v1/data/portfolio/{address} — ETH + canonical token balances, $0.004
- GET https://chainverdict.xyz/v1/security/email/{domain} — SPF/DMARC/DKIM email-spoofing posture, $0.01
- GET https://chainverdict.xyz/v1/security/tls/{domain} — live TLS certificate validity/expiry check, $0.01
- GET https://chainverdict.xyz/v1/security/typosquat/{domain} — brand look-alike/homoglyph structural check, $0.005
- POST https://chainverdict.xyz/v1/batch/validate — batch-validate up to 500 IBAN/VAT/BIC/LEI/ISIN items, $0.10
- GET https://chainverdict.xyz/v1/verify/payment/{txhash} — on-chain ERC-20 settlement verification on Base, $0.02
- GET https://chainverdict.xyz/v1/verify/token/{addressOrSymbol} — canonical token verification on Base, $0.005
- GET https://chainverdict.xyz/v1/validate/lei/{lei} — ISO 17442 LEI validation, $0.002
- GET https://chainverdict.xyz/v1/validate/isin/{isin} — ISO 6166 ISIN validation, $0.001
- GET https://chainverdict.xyz/v1/validate/iban/{iban} — IBAN mod-97 validation, $0.001
- GET https://chainverdict.xyz/v1/validate/vat/{vat} — EU VAT format+checksum validation, $0.001
- GET https://chainverdict.xyz/v1/validate/bic/{bic} — BIC/SWIFT validation, $0.001
- POST https://chainverdict.xyz/v1/doc/html-to-markdown — HTML to Markdown, $0.002
- POST https://chainverdict.xyz/v1/doc/diff — structured text diff, $0.002

## Free integration example
- https://pulse.chainverdict.xyz/evidence.html — downloadable x402 observation checker, dated example, trust limits and x401 scope. No wallet needed.
- Historical Pulse records for 56 days are mismatched; the checker excludes those and the 2 October 2026 transition day.
- x401 proof requirements are distinct from x402 payment. This portfolio does not establish credential eligibility.

## Machine-readable
- Methodology (free): https://chainverdict.xyz/v1/methodology
- OpenAPI: https://chainverdict.xyz/openapi.json
- x402 discovery: https://chainverdict.xyz/.well-known/x402.json
- Response signing key (Ed25519, all /v1/* responses signed): https://chainverdict.xyz/.well-known/signing-key.json
- Cached same-operator quality attestation (Ed25519-signed; automatic refresh is off, inspect expiry): https://pulse.chainverdict.xyz/v1/attestations/latest?url=https://chainverdict.xyz/v1/data/block