Saylor Innovations Agent Bazaar by Saylor Innovations
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mirrored listing x402 eip155:8453

Re-verify any exhibit402 proof-of-publication certificate for $0

Re-verify any exhibit402 proof-of-publication certificate for $0.02. Pass id = ERC-721 token id, Arweave tx id, or job id. The service re-downloads the permanently stored screenshot and signed manifest, recomputes every SHA-256, and checks them against the manifest and the on-chain record (immutable screenshotSha256, tokenURI, owner). Returns a machine-readable verdict with per-check detail, so an agent can confirm a certificate is genuine without trusting the issuer.

Do you run exhibit402.dylan-caponi.workers.dev? This listing was mirrored from Coinbase's public Bazaar. Claim it in 30 seconds — no account required — and it becomes verified, permanently overriding the mirrored copy.

Claim this listing
20000 (raw units)
price
3
calls / 30d
1
unique payers
2026-08-21
updated

Provider

exhibit402.dylan-caponi.workers.dev · discovered, not yet claimed by its owner

Payment (x402 accepts[])

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x16B636328745E4e6086071B8Ff9f0C1C7DF9eB21",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "20000",
    "maxTimeoutSeconds": 300
  }
]

Output schema

{
  "bazaar": {
    "info": {
      "input": {
        "method": "GET",
        "queryParams": {
          "id": "6"
        },
        "type": "http"
      },
      "output": {
        "example": {
          "checks": [
            {
              "detail": "re-downloaded 4002928 bytes; SHA-256 matches the manifest",
              "name": "screenshot_hash",
              "pass": true
            },
            {
              "detail": "contract's immutable screenshotSha256 matches the manifest",
              "name": "onchain_sha256",
              "pass": true
            }
          ],
          "note": "All stored bytes re-hashed to their recorded values.",
          "tier": "CERTIFIED",
          "token_id": "6",
          "url": "https://en.wikipedia.org/wiki/SHA-2",
          "verified": true
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "properties": {
                "id": {
                  "description": "Certificate identifier: ERC-721 token id (digits), Arweave tx id (43 chars), or exhibit402 job id (uuid)",
                  "type": "string"
                }
              },
              "required": [
                "id"
              ],
              "type": "object"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "properties": {
                "checks": {
                  "type": "array"
                },
                "note": {
                  "type": "string"
                },
                "tier": {
                  "type": "string"
                },
                "token_id": {
                  "type": "string"
                },
                "url": {
                  "type": "string"
                },
                "verified": {
                  "type": "boolean"
                }
              },
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

Use it

curl

curl "https://exhibit402.dylan-caponi.workers.dev/verify"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://exhibit402.dylan-caponi.workers.dev/verify");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://exhibit402.dylan-caponi.workers.dev/verify")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Machine-readable

Everything on this page is also available as clean JSON at /resources/13224.json, and this resource appears in /discovery/resources and /discovery/search.