chainverdict.xyz: measured on x402, not yet graded

chainverdict.xyz

HOLDverifiedPreflight verdict before paying this host · score 80 · backed by 2 settled payments to this seller with a conclusive result · what this means

Underdelivered on 1 paid call(s): a real response missing promised fields, confirmed on two calls.

2Paid calls recorded

Grades

No purchase-based grade yet. Everything below was measured, by paying this seller or by sweeping the chain, and none of it is editorial.

Accuracy against a primary source

accurate Gas price (Base): returned 0.005, off by +0 gwei against Base chain latest block · $0.002/call · tx

Measured 2026-08-17 by paying this seller and comparing the number it returned with a source it cannot resell. A dated sample, not a live guarantee. Full corpus at /categories.

Did it deliver what it promised?

0 of 1 endpoint we paid returned everything their own published schema promised.

short missing 1 of 1 /v1/data/block · 2,474ms · 27 bonus field(s)

Real response shape

{
 "chain": "string",
 "number": "integer",
 "timestamp": "integer",
 "time_iso": "string",
 "tx_count": "integer",
 "gas_used": "string",
 "gas_limit": "string",
 "utilization_pct": "number",
 "gas_price_gwei": "number",
 "checked_at": "string",
 "_evidence": {
  "methodologyVersion": "string",
  "decision": "string",
  "semantics": {
   "assuranceIsNotAProbability": "string",
   "signatureProvesIntegrityNotTruth": "string",
   "absenceOfSignalIsNotAssurance": "string"
  },
  "subject": "string",
  "checksPerformed": {
   "array_of": "string"
  },
  "dataSources": {
   "array_of": "object"
  },
  "freshness": {
   "basis": "string",
   "observedAt": "string",
   "maxUsefulAgeSeconds": "integer",
   "guidance": "string"
  },
  "blockHeight": "integer",
  "blockHeightObservedAt": "string",
  "blockHeightAgeSeconds": "integer",
  "assurance": {
   "level": "string",
   "basis": "string"
  },
  "humanApprovalRecommended": "string",
  "limitations": {
   "array_of": "string"
  },
  "globalLimitations": {
   "array_of": "string"
  },
  "methodology": "string",
  "verifySignature": "string"
 }
}

Types only, verified from a real paid call. Values discarded.

This is a paid delivery check: we called the endpoint with its own advertised input and compared the response against its own advertised output. It is the one thing free probing cannot see.

Verifiable receipts

2 paid calls to this host are recorded as tamper-evident receipts, including 1 where it underdelivered. Each can be re-verified independently, from the archived bytes up.

underdeliveredwab_31e38fd517091cc4

chainverdict.xyz

Promised 1 fields for $0.001, charged $0.001, and underdelivered: returned 0 of 1. Missing blockNumber. Shortfall confirmed on two calls.

tx 0x3d396ee0…

✓ integrity✓ verdict✓ raw bytes

Evidence and how to verify it yourself

The real response shape, types only, values discarded:

{
 "_evidence": {
  "assurance": {
   "basis": "string",
   "level": "string"
  },
  "blockHeight": "integer",
  "blockHeightAgeSeconds": "integer",
  "blockHeightObservedAt": "string",
  "checksPerformed": {
   "array_of": "string"
  },
  "dataSources": {
   "array_of": "object"
  },
  "decision": "string",
  "freshness": {
   "basis": "string",
   "guidance": "string",
   "maxUsefulAgeSeconds": "integer",
   "observedAt": "string"
  },
  "globalLimitations": {
   "array_of": "string"
  },
  "humanApprovalRecommended": "string",
  "limitations": {
   "array_of": "string"
  },
  "methodology": "string",
  "methodologyVersion": "string",
  "semantics": {
   "absenceOfSignalIsNotAssurance": "string",
   "assuranceIsNotAProbability": "string",
   "signatureProvesIntegrityNotTruth": "string"
  },
  "subject": "string",
  "verifySignature": "string"
 },
 "chain": "string",
 "checked_at": "string",
 "gas_limit": "string",
 "gas_price_gwei": "number",
 "gas_used": "string",
 "number": "integer",
 "time_iso": "string",
 "timestamp": "integer",
 "tx_count": "integer",
 "utilization_pct": "number"
}

Three independent checks, none needing trust in this site: integrity recomputes the id as a hash of the evidence, so any edit shows; verdict re-derives the result offline; raw re-reads the untouched bytes archived at pay time and reproduces the shape.

python3 receipts.py --verify wab_31e38fd517091cc4

The full record and the format are at /receipts.

What it sells

22 endpoints listed, priced $0.0010 to $0.1000, settling on Base.

$0.0010 Latest Base block: number, timestamp and hash. The cheapest call on the service — useful as a liveness and connectivit
$0.0010 Validate an IBAN structurally: country length rules, character set and the ISO 7064 mod-97 check. Deterministic. A str
$0.0010 Validate an ISIN against ISO 6166: country prefix, 9-character NSIN and Luhn check digit. Structural only; does not co
$0.0010 Validate a BIC/SWIFT code against ISO 9362: 8 or 11 characters, bank and country segments, location and branch codes.
$0.0010 Validate an EU VAT number's structure and per-country check digits. Format only — no VIES lookup, so it does not confi
$0.0010 Validate an IBAN structurally: country length rules, character set and the ISO 7064 mod-97 check. Deterministic. A str
$0.0020 Base gas price oracle: current gas cost on Base, base fee and priority fee in gwei, at a stated block height. For agen
$0.0020 Convert an HTML document to clean Markdown for LLM ingestion: strips scripts, styles and navigation chrome, preserves
and 14 more

First seen in the registry on 2026-08-11.

Grades here come from paying this service and recording what happened, or from calling it where it is free. Settlement figures are swept daily from Base USDC Transfer logs. Nothing on this page is sponsored.

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