Developer Tool · x402

Canonicalizes a bounded JSON evidence package and returns an independently reproducible…

Canonicalizes a bounded JSON evidence package and returns an independently reproducible SHA-256 digest without asserting the truth of its claims.

by sandbox.weverpay.com · discovered, not yet claimed by its owner · updated 2026-08-24

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Canonicalizes a bounded JSON evidence package and returns an independently reproducible SHA-256 digest without asserting the truth of its claims.

Tags: bazaar

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/4278.json for the price and payment options.
Pay. Call GET https://sandbox.weverpay.com/api/wever-pay/sandbox/services/evidence-integrity-digest. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base Sepolia, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: see accepts
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base Sepolia
Uptime: 1 of the last 1 checks answered
Calls (30d): 5 · 2 unique payers (third-party data from the public x402 Bazaar)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base Sepolia eip155:84532	USDC	20000	0xff52824610cb82603089f2d33d44682edffa6630	60s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:84532",
    "payTo": "0xff52824610cb82603089f2d33d44682edffa6630",
    "asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
    "amount": "20000",
    "maxTimeoutSeconds": 60
  }
]

Schemas

Output schema (JSON Schema)

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "claims": {
            "buildPassed": true,
            "testCount": 195
          },
          "observedAt": "2026-08-17T00:00:00.000Z",
          "sources": [
            "https://example.test/evidence/release.json"
          ],
          "subject": "agent-service-release-2026-08-17"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "canonicalDigest": "sha256:0000000000000000000000000000000000000000000000000000000000000000",
          "canonicalization": "WEVER_CANONICAL_JSON_V1",
          "claimKeys": [
            "buildPassed",
            "testCount"
          ],
          "matchesExpected": null,
          "reportVersion": "1.0.0",
          "sourceCount": 1,
          "subject": "agent-service-release-2026-08-17",
          "verificationStatus": "DIGEST_CREATED"
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "additionalProperties": false,
              "properties": {
                "claims": {
                  "type": "object"
                },
                "expectedDigest": {
                  "pattern": "^sha256:[0-9a-f]{64}$",
                  "type": "string"
                },
                "observedAt": {
                  "maxLength": 40,
                  "minLength": 20,
                  "type": "string"
                },
                "sources": {
                  "items": {
                    "pattern": "^https://",
                    "type": "string"
                  },
                  "maxItems": 10,
                  "type": "array",
                  "uniqueItems": true
                },
                "subject": {
                  "maxLength": 200,
                  "minLength": 1,
                  "type": "string"
                }
              },
              "required": [
                "subject",
                "claims",
                "sources",
                "observedAt"
              ],
              "type": "object"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "additionalProperties": false,
              "properties": {
                "canonicalDigest": {
                  "pattern": "^sha256:[0-9a-f]{64}$",
                  "type": "string"
                },
                "canonicalization": {
                  "enum": [
                    "WEVER_CANONICAL_JSON_V1"
                  ],
                  "type": "string"
                },
                "claimKeys": {
                  "items": {
                    "type": "string"
                  },
                  "type": "array"
                },
                "matchesExpected": {
                  "type": [
                    "boolean",
                    "null"
                  ]
                },
                "reportVersion": {
                  "type": "string"
                },
                "sourceCount": {
                  "maximum": 10,
                  "minimum": 0,
                  "type": "integer"
                },
                "subject": {
                  "type": "string"
                },
                "verificationStatus": {
                  "enum": [
                    "DIGEST_CREATED",
                    "DIGEST_MATCHED",
                    "DIGEST_MISMATCH"
                  ],
                  "type": "string"
                }
              },
              "required": [
                "reportVersion",
                "verificationStatus",
                "canonicalDigest",
                "matchesExpected",
                "subject",
                "claimKeys",
                "sourceCount",
                "canonicalization"
              ],
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

Example shape — generated from the schema, not a captured live response

null

Examples

curl

curl "https://sandbox.weverpay.com/api/wever-pay/sandbox/services/evidence-integrity-digest"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://sandbox.weverpay.com/api/wever-pay/sandbox/services/evidence-integrity-digest");
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://sandbox.weverpay.com/api/wever-pay/sandbox/services/evidence-integrity-digest")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: sandbox.weverpay.com
Endpoint: https://sandbox.weverpay.com/api/wever-pay/sandbox/services/evidence-integrity-digest
Machine-readable: /resources/4278.json