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PayPerByte CCTP v2 Attestation Latency Feed
x402
PayPerByte CCTP v2 Attestation Latency Feed is a paid API for AI agents from x402.payperbyte.io, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-27).
Returns signed latency distribution metrics for Circle's CCTP v2 cross-chain bridge attestation, separated by Fast and Standard settlement paths, with first-party burn polling data.
Price / call$0.01
Success—
StatusUnknown
How this service works
Measured Circle CCTP v2 attestation latency: Fast/Standard distributions (never blended), first-party burn polling. Bounded observations; percentiles withheld below sample floor. Embedded EIP-712 receipt proves who signed the bytes, not that latency holds. Full: https://x402.payperbyte.io/feeds
Output
A cryptographically signed (EIP-712) payload containing latency distribution statistics for Circle CCTP v2 attestation, broken out by settlement path (Fast and Standard are always separate, never blended). Includes first-party burn polling data, bounded observations, and percentile metrics (withheld when sample count falls below the floor). The EIP-712 receipt proves the signing identity of the data provider.
Example use cases
Optimizing cross-chain transfer routing
“I'm about to do a USDC cross-chain transfer via CCTP. Can you check the current attestation latency for the fast path on Arbitrum so I know if it's worth paying for faster settlement?”
Monitoring CCTP bridge health
“Pull the CCTP v2 attestation latency stats for both fast and standard paths across all chains — I want to see if there are any outliers or slowdowns right now, with the signed payload so I can verify the data.”
Benchmarking settlement speed by chain
“Get me the standard path CCTP v2 attestation latency distribution specifically for Optimism — I'm comparing bridge performance across chains and need the first-party signed metrics.”
Technical details
Endpoint
POSThttps://x402.payperbyte.io/feeds/cctp-attestation-latency?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need signed, verifiable CCTP v2 attestation latency data from a first-party source — particularly when you need Fast and Standard paths reported separately (not blended), or when the cryptographic provenance of the data (EIP-712 receipt) matters for your application. Prefer this over generic bridge monitoring tools when you need per-chain breakdown across Base, Arbitrum, or Optimism, or when you need audit-ready signed latency metrics for routing decisions or compliance purposes.
Side effects
- 400 error if an unrecognized 'path' value is submitted (no silent fallback)
- 400 error if an unrecognized 'chain' value is submitted (no paid empty answer)
- Percentile statistics withheld when observation count is below the sample floor
- Payment failure if USDC balance is insufficient for the $0.01/call fee
- Empty or partial distribution if no observations exist for the requested chain/path combination
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| path | string | Optional. CCTP v2 settlement path. Fast and Standard are never blended — omitting this returns both as separate distributions; an unrecognized value is a 400, not a silent fallback. |
| chain | string | Optional. Narrow to one source chain. Omit for every configured chain. An unrecognized value is a 400, not a paid empty answer. |
Output
Schema · Response
{
"type": "json",
"example": {
"_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": {
"query": {
"path": "fast",
"chain": "base"
},
"ruleset": "cctp-lat-v1",
"coverage": {
"status": "observed"
},
"distributions": {
"base/fast": {
"max_s": 7999,
"min_s": 0,
"p50_s": 1753,
"p95_s": 7265,
"p99_s": 7583,
"samples": 27753,
"measured_samples": 37,
"percentiles_reported": true,
"percentiles_withheld_because": null
}
},
"observation_count": 27753
},
"attestation": {
"domain": {
"name": "BYTE Library",
"chainId": 421614,
"version": "1"
},
"signer": "0x…",
"signature": "0x…",
"payloadHash": "0x…"
}
}
}Tags
x402
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