Roundhouse

PayPerByte

A curated library of live data feeds and oracles for AI agents — pay per call in USDC over x402, settled on Base mainnet. First-party, verifiable, no token. Every paid response carries an EIP-712 X-BYTE-Attestation receipt the agent verifies before acting.

DataLiveeip155:8453Exactvia cdp
https://x402.payperbyte.io/feeds/cctp-attestation-latency
PayperbyteCctpAttestation-latencyCircleSigned-measurement
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far.
$9.01
Verified settled volume
283 settlements proven x402 by their on-chain EIP-3009 marker.
$0.010
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-08-25 18:37Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xffFf4B8Da8C165B556326453446F6940C8AFE0DB

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.01USDC≈ $0.01 USD
on Base · exact scheme

Pay 0.01 USDC on Base to 0xffFf…FE0DB. The signed payment is good for 5 minutes.

Paid to
0xffFf…FE0DB
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
10000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xffFf4B8Da8C165B556326453446F6940C8AFE0DB",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "path": "fast",
          "chain": "base"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "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…"
          }
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "properties": {
            "body": {
              "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."
                }
              }
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  },
  "payperbyte-service-metadata": {
    "tags": [
      "payperbyte",
      "cctp",
      "attestation-latency",
      "circle",
      "signed-measurement"
    ],
    "serviceName": "PayPerByte"
  }
}

Provenance

Seen in the source catalog
2026-08-25 18:37Z
Last indexed by Roundhouse
2026-09-24 10:40Z
Last enriched (probe, favicon, geo)
2026-09-10 23:15Z
x402 version
2
Max timeout
300s
Liveness probe
HTTP 405
Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md
Show the prompt
Using Roundhouse, look up the x402 service PayPerByte and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=PayPerByte'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://x402.payperbyte.io/feeds/cctp-attestation-latency, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402,
or use an organization key from https://roundhouseai.io/dashboard/team.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.