# PayPerByte CCTP v2 Attestation Latency Feed

> 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 2026-09-15).

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.

## Facts

- Endpoint: POST https://x402.payperbyte.io/feeds/cctp-attestation-latency
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/payperbyte-cctp-v2-attestation-latency-feed-07487334
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Qi67V2htak_FRGVEzjNVE

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability payperbyte-cctp-v2-attestation-latency-feed-07487334 -d '<json body>'
```

Example prompt: Pull me the current CCTP v2 attestation latency distributions for both fast and standard paths on Base — I need the signed breakdown to see which settlement route is performing better right now.

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "path": {
   "enum": [
    "fast",
    "standard"
   ],
   "type": "string",
   "description": "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": {
   "enum": [
    "base",
    "arbitrum",
    "optimism"
   ],
   "type": "string",
   "description": "Optional. Narrow to one source chain. Omit for every configured chain. An unrecognized value is a 400, not a paid empty answer."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/payperbyte-cctp-v2-attestation-latency-feed-07487334/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.payperbyte.io](https://www.zero.xyz/host/x402.payperbyte.io/llms.txt)