PayPerByte · Feeds Cctp Attestation Latency

import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPay = wrapFetchWithPayment(fetch, account);

const res = await fetchWithPay("https://x402.payperbyte.io/feeds/cctp-attestation-latency", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "chain": "base",
    "path": "fast"
  }),
});
const data = await res.json();

curl -X POST \
  "https://x402.payperbyte.io/feeds/cctp-attestation-latency" \
  -H "Content-Type: application/json" \
  -d '{"chain":"base","path":"fast"}' \
  -H "X-PAYMENT: <signed x402 payment>"

{
  "_note": "Excerpt of a real answer (live service, 2026-08-25, post FD HIGH-2 clamp fix); hash/signature elided, other buckets trimmed. Every figure is a BOUNDED observation (burn -> first poll seeing complete), never an exact measurement — min_s is floored at 0 (a bounded observation cannot precede the burn it bounds; an earlier example briefly shipped an unclamped negative value from L2-clock-skew artifacts, fixed 2026-08-25). Percentiles are withheld below an 8-measured-sample floor. Fast and Standard are separate settlement paths and are never blended into one percentile. The embedded EIP-712 receipt (domain chainId 421614 = Arbitrum Sepolia, a frozen signing namespace, not a settlement rail) proves who signed these exact bytes — not that the measured latency will hold for your own transfer.",
  "answer": {
    "coverage": {
      "status": "observed"
    },
    "distributions": {
      "base/fast": {
        "max_s": 7999,
        "measured_samples": 37,
        "min_s": 0,
        "p50_s": 1753,
        "p95_s": 7265,
        "p99_s": 7583,
        "percentiles_reported": true,
        "percentiles_withheld_because": null,
        "samples": 27753
      }
    },
    "observation_count": 27753,
    "query": {
      "chain": "base",
      "path": "fast"
    },
    "ruleset": "cctp-lat-v1"
  },
  "attestation": {
    "domain": {
      "chainId": 421614,
      "name": "BYTE Library",
      "version": "1"
    },
    "payloadHash": "0x…",
    "signature": "0x…",
    "signer": "0x…"
  }
}