saylorinnovations.com

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "Payment required to access this resource.",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "memo": "saylor:audit:x402",
        "name": "USD Coin",
        "note": "Base settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
        "version": "2",
        "facilitatorOnly": true,
        "assetTransferMethod": "eip3009"
      },
      "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "memo": "saylor:audit:x402",
        "session": "eyJhcnRpY2xlSWQiOiJhdWRpdDp4NDAyIiwicmVmZXJlbmNlIjoiQTJOZ2dBQ1NmejY4a1JFejVmcVcxOFFuNXRuYktES2Vjem4zVFhtRkF3TjkiLCJyZWNpcGllbnQiOiI3TFNqZnJKZjhmTnNCOFZBOXU3TjNXRW4yNXNtUUxwb2IzU3Z5VXZYYWN5NyIsIm1pbnQiOiJFUGpGV2RkNUF1ZnFTU3FlTTJxTjF4enliYXBDOEc0d0VHR2tad3lURHQxdiIsIm1pbkFtb3VudCI6MTAwMDAsImV4cCI6MTc5MjA3NzQyOTYyMH0.BqgCbWRMgxVU550YNkgM4Q_hcXtStAjZsL9OKNkIZx8",
        "feePayer": "BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP",
        "reference": "A2NggACSfz68kREz5fqW18Qn5tnbKDKeczn3TXmFAwN9"
      },
      "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
      "amount": "10000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://saylorinnovations.com/api/audit/x402?url=https%3A%2F%2Fsaylorinnovations.com%2Fapi%2Fx402%2Fping",
    "tags": [
      "x402",
      "trust report",
      "endpoint reliability",
      "bazaar",
      "preflight"
    ],
    "iconUrl": "https://saylorinnovations.com/og-image.jpg",
    "mimeType": "application/json",
    "description": "x402 endpoint trust report - repeated 402 probes, price stability, latency and Coinbase Bazaar usage",
    "serviceName": "Saylor Innovations Audits"
  },
  "extensions": {
    "tags": [
      "x402",
      "trust report",
      "endpoint reliability",
      "bazaar",
      "preflight"
    ],
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "url": "https://saylorinnovations.com/api/x402/ping"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "url": "https://saylorinnovations.com/api/x402/ping",
            "flags": [],
            "scope": "three unpaid probes plus the public Coinbase discovery record; it does not pay the endpoint, so delivery after payment is not verified",
            "score": 100,
            "bazaar": {
              "listed": true,
              "checked": true,
              "calls_30d": 12,
              "unique_payers_30d": 3,
              "merchant_resources": 480
            },
            "checks": {
              "reachable": "3/3 probes answered",
              "returns_402": "3/3 returned a parseable 402 challenge",
              "bazaar_discovery_extension": true,
              "terms_stable_across_probes": true
            },
            "verdict": "healthy",
            "latency_ms": {
              "max": 260,
              "min": 180,
              "median": 210,
              "probes": [
                180,
                210,
                260
              ]
            }
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET",
                  "POST",
                  "PUT",
                  "PATCH",
                  "DELETE",
                  "HEAD"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "url"
                ],
                "properties": {
                  "url": {
                    "type": "string",
                    "examples": [
                      "https://saylorinnovations.com/api/x402/ping"
                    ],
                    "maxLength": 2000,
                    "description": "Full URL of the x402-paid resource to check (GET or POST-only); probed three times without payment"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "json"
              },
              "example": {
                "type": "object",
                "required": [
                  "url",
                  "verdict",
                  "score",
                  "flags"
                ],
                "properties": {
                  "url": {
                    "type": "string",
                    "description": "URL that was probed"
                  },
                  "flags": {
                    "type": "array",
                    "items": {
                      "type": "string"
                    },
                    "description": "Specific problems found; empty when none"
                  },
                  "scope": {
                    "type": [
                      "string",
                      "null"
                    ],
                    "description": "Scope the result covers"
                  },
                  "score": {
                    "type": "number",
                    "description": "Trust score from 0 to 100"
                  },
                  "bazaar": {
                    "type": "object",
                    "description": "Coinbase Bazaar record: listed flag, 30-day calls, unique payers and last call"
                  },
                  "checks": {
                    "type": "object",
                    "description": "Individual check outcomes"
                  },
                  "verdict": {
                    "enum": [
                      "healthy",
                      "caution",
                      "unreliable"
                    ],
                    "type": "string",
                    "description": "healthy, caution or unreliable"
                  },
                  "challenge": {},
                  "checked_at": {
                    "type": [
                      "string",
                      "null"
                    ],
                    "description": "Time the check was run (UTC)"
                  },
                  "latency_ms": {
                    "type": "object",
                    "description": "Probe latency: min, median, max and each probe"
                  },
                  "method_probed": {
                    "type": [
                      "string",
                      "null"
                    ],
                    "description": "Method probed"
                  }
                }
              }
            }
          }
        }
      }
    },
    "method": "GET",
    "example": {
      "url": "https://saylorinnovations.com/api/x402/ping",
      "flags": [],
      "scope": "three unpaid probes plus the public Coinbase discovery record; it does not pay the endpoint, so delivery after payment is not verified",
      "score": 100,
      "bazaar": {
        "listed": true,
        "checked": true,
        "calls_30d": 12,
        "unique_payers_30d": 3,
        "merchant_resources": 480
      },
      "checks": {
        "reachable": "3/3 probes answered",
        "returns_402": "3/3 returned a parseable 402 challenge",
        "bazaar_discovery_extension": true,
        "terms_stable_across_probes": true
      },
      "verdict": "healthy",
      "latency_ms": {
        "max": 260,
        "min": 180,
        "median": 210,
        "probes": [
          180,
          210,
          260
        ]
      }
    },
    "license": "LicenseRef-Saylor-Agent-Use-1.0",
    "mimeType": "application/json",
    "freshness": "fetched live on every request; nothing is stored",
    "freeSample": "https://saylorinnovations.com/api/audit/x402/free",
    "tokenCount": null,
    "inputSchema": {
      "url": {
        "examples": [
          "https://saylorinnovations.com/api/x402/ping"
        ],
        "maxLength": 2000,
        "description": "Full URL of the x402-paid resource to check (GET or POST-only); probed three times without payment"
      }
    },
    "serviceName": "Saylor Innovations Audits",
    "instructions": "STANDARD PATH (works with stock x402 clients): send payload.transaction — a base64 partially-signed Solana transaction — and we route verify/settle through an x402 facilitator that sponsors the fee and submits it. Include the chosen accepts entry as \"accepted\" so we can match terms. ALTERNATIVE PATH (no facilitator): Pick ONE entry from accepts and use the reference and session from THAT entry — each asset has its own. USDC or USDT: send an SPL transfer of the exact amount. Native SOL (asset=So11111111111111111111111111111111111111112, extra.native=true): send that many lamports with a system transfer. Either way include extra.reference as a read-only account (Solana Pay style), then retry with PAYMENT-SIGNATURE: base64({x402Version:2, payload:{session, reference}}). If your client cannot attach a reference, send payload.signature instead (USDC only). SOL amounts are quoted live and expire in 120s; stablecoins do not move. The facilitator path verifies and settles in this request. Only the alternative self-submitted Solana path needs retries while the transfer is indexed (typically 3-4 attempts over 10-20s). On that path, a 402 saying \"payment not found on-chain yet\" means keep retrying.",
    "outputSchema": {
      "type": "object",
      "required": [
        "url",
        "verdict",
        "score",
        "flags"
      ],
      "properties": {
        "url": {
          "type": "string",
          "description": "URL that was probed"
        },
        "flags": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Specific problems found; empty when none"
        },
        "score": {
          "type": "number",
          "description": "Trust score from 0 to 100"
        },
        "bazaar": {
          "type": "object",
          "description": "Coinbase Bazaar record: listed flag, 30-day calls, unique payers and last call"
        },
        "checks": {
          "type": "object",
          "description": "Individual check outcomes"
        },
        "verdict": {
          "enum": [
            "healthy",
            "caution",
            "unreliable"
          ],
          "type": "string",
          "description": "healthy, caution or unreliable"
        },
        "latency_ms": {
          "type": "object",
          "description": "Probe latency: min, median, max and each probe"
        }
      }
    },
    "noPathTemplate": true,
    "settlementModes": [
      "facilitator-transaction",
      "self-submitted-reference"
    ],
    "typicalLatencyMs": 1500
  },
  "x402Version": 2
}

Accepts

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

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://saylorinnovations.com/api/audit/x402",
    "description": "",
    "maxAmountRequired": "10000",
    "maxTimeoutSeconds": 120
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "mimeType": "application/json",
    "resource": "https://saylorinnovations.com/api/audit/x402",
    "description": "",
    "maxAmountRequired": "10000",
    "maxTimeoutSeconds": 120
  }
]

Provenance

Seen in the source catalog

2026-10-16 00:48Z

Last indexed by Roundhouse

2026-10-25 17:47Z

Last enriched (probe, favicon, geo)

2026-10-15 15:15Z

x402 version

1

Max timeout

120s

Liveness probe

HTTP 402