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Evidence row 120051

Observed , by baseline/1.

Kind
listing
About
source_record x402_bazaar:https://saylorinnovations.com/api/kb/agent-retry-idempotency
Recorded
Previous row
None: the first of its kind about this subject
Body SHA-256
c1cdfcc923ad42c0631844793ae19c68143ba23e742d45add7dba65f3ffcbec6
Leaf
0x71d34c4f594995861ca0e599f26b90680e38bdb8f282c753e2b5d4fd6d2bfec5

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://saylorinnovations.com/api/kb/agent-retry-idempotency"
    ]
  ],
  "name": "Saylor Innovations Guide Library",
  "owner_address": "0xa2a8df0f7caabea4e120a2568118f141569fc8aa",
  "raw": {
    "accepts": [
      {
        "amount": "10000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "assetTransferMethod": "eip3009",
          "facilitatorOnly": true,
          "memo": "saylor:agent-retry-idempotency",
          "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"
        },
        "maxTimeoutSeconds": 120,
        "network": "eip155:8453",
        "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
        "scheme": "exact"
      },
      {
        "amount": "10000",
        "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
        "extra": {
          "assetTransferMethod": "eip3009",
          "facilitatorOnly": true,
          "memo": "saylor:agent-retry-idempotency",
          "name": "USD Coin",
          "note": "Polygon settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
          "version": "2"
        },
        "maxTimeoutSeconds": 120,
        "network": "eip155:137",
        "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
        "scheme": "exact"
      },
      {
        "amount": "10000",
        "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
        "extra": {
          "assetTransferMethod": "eip3009",
          "facilitatorOnly": true,
          "memo": "saylor:agent-retry-idempotency",
          "name": "USD Coin",
          "note": "Arbitrum settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
          "version": "2"
        },
        "maxTimeoutSeconds": 120,
        "network": "eip155:42161",
        "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
        "scheme": "exact"
      },
      {
        "amount": "10000",
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM",
          "memo": "saylor:agent-retry-idempotency",
          "reference": "5mwXfQ7NjYTT1YbCQnSxdVhjb7RML7c1m7AvNx3FwMhH",
          "session": "eyJhcnRpY2xlSWQiOiJhZ2VudC1yZXRyeS1pZGVtcG90ZW5jeSIsInJlZmVyZW5jZSI6IjVtd1hmUTdOallUVDFZYkNRblN4ZFZoamI3Uk1MN2MxbTdBdk54M0Z3TWhIIiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjoiRVBqRldkZDVBdWZxU1NxZU0ycU4xeHp5YmFwQzhHNHdFR0drWnd5VER0MXYiLCJtaW5BbW91bnQiOjEwMDAwLCJleHAiOjE3OTI0NTcxODQ4OTV9.mWolJBvx4wRSN_C_V8LmtDBrZEx9lewPYx4RhCcjaME"
        },
        "maxTimeoutSeconds": 120,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
        "scheme": "exact"
      },
      {
        "amount": "10000",
        "asset": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB",
        "extra": {
          "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM",
          "memo": "saylor:agent-retry-idempotency",
          "reference": "FZm4WcA2GY6SgME2Ba5yzRzEjadet2irBgk8wbQUjRqB",
          "session": "eyJhcnRpY2xlSWQiOiJhZ2VudC1yZXRyeS1pZGVtcG90ZW5jeSIsInJlZmVyZW5jZSI6IkZabTRXY0EyR1k2U2dNRTJCYTV5elJ6RWphZGV0MmlyQmdrOHdiUVVqUnFCIiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjoiRXM5dk1GcnphQ0VSbUpmckY0SDJGWUQ0S0NvTmtZMTFNY0NlOEJlbndOWUIiLCJtaW5BbW91bnQiOjEwMDAwLCJleHAiOjE3OTI0NTcxODQ4OTV9.6YXKTwrKlXajEKsffuDv4Fk2rq6KgB5RL41JNqagqk0"
        },
        "maxTimeoutSeconds": 120,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
        "scheme": "exact"
      },
      {
        "amount": "92618",
        "asset": "So11111111111111111111111111111111111111112",
        "extra": {
          "memo": "saylor:agent-retry-idempotency",
          "native": true,
          "note": "Native SOL: send lamports with a system transfer, not an SPL transfer. Price is quoted live and this quote expires in 120s.",
          "quotedLamports": "95483",
          "reference": "EJxiiz3d9Tet6Y2sgcRdYn9Ce44iiZVgcvxxFA68ZmAt",
          "session": "eyJhcnRpY2xlSWQiOiJhZ2VudC1yZXRyeS1pZGVtcG90ZW5jeSIsInJlZmVyZW5jZSI6IkVKeGlpejNkOVRldDZZMnNnY1JkWW45Q2U0NGlpWlZnY3Z4eEZBNjhabUF0IiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjpudWxsLCJtaW5BbW91bnQiOjkyNjE4LCJleHAiOjE3OTI0NTcxODQ4OTV9.rdjhaxC9IOoR7Dc-fbKZJ4DjvMlJ2aKZ-T6-qGk6JdI",
          "solUsdPrice": 104.73
        },
        "maxTimeoutSeconds": 120,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
        "scheme": "exact"
      }
    ],
    "description": "Prevent duplicate side effects when agents retry - idempotency keys, durable state machines and reconciliation",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "type": "http"
          },
          "output": {
            "example": {
              "body": "A procedure for preventing duplicate side effects (payments, messages, orders, files) when agents retry after timeouts: defining a stable logical-operation key scope bound to a canonical payload hash, building a durable state machine (not a boolean flag), placing the side effect inside an atomic boundary, classifying retryable vs terminal errors, and handling same-key/different-payload conflicts explicitly rather than silently.",
              "c": "AI & Agents",
              "id": "agent-retry-idempotency",
              "t": "Agent Retry and Idempotency Guide"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "body": {
                      "description": "Main body text",
                      "type": "string"
                    },
                    "c": {
                      "description": "Category of the guide",
                      "type": "string"
                    },
                    "id": {
                      "description": "Identifier of the record",
                      "type": "string"
                    },
                    "license": {
                      "description": "License identifier",
                      "type": "string"
                    },
                    "price": {
                      "description": "Price",
                      "type": [
                        "number",
                        "null"
                      ]
                    },
                    "t": {
                      "description": "Title of the guide",
                      "type": "string"
                    }
                  },
                  "required": [
                    "id",
                    "t",
                    "c",
                    "body"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "json",
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "iconUrl": "https://res.cloudinary.com/bdb-prod/image/upload/c_fill,ar_1:1,w_256,h_256,f_auto,q_auto/v1790235422/bazaar-icons/bc5e2b3d111ebbef.jpg",
    "lastUpdated": "2026-10-20T00:44:24.949Z",
    "quality": {
      "l30DaysTotalCalls": 3,
      "l30DaysUniquePayers": 3,
      "lastCalledAt": "2026-10-20T00:44:24.632Z"
    },
    "resource": "https://saylorinnovations.com/api/kb/agent-retry-idempotency",
    "serviceName": "Saylor Innovations Guide Library",
    "tags": [
      "idempotency",
      "retries",
      "distributed-systems",
      "agent-reliability",
      "payments"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Prevent duplicate side effects when agents retry - idempotency keys, durable state machines and reconciliation"
}

What the leaf hashes

{"body":"c1cdfcc923ad42c0631844793ae19c68143ba23e742d45add7dba65f3ffcbec6","id":120051,"kind":"listing","method":"baseline/1","observed_us":1793025617146113,"prev":null,"subject":"x402_bazaar:https://saylorinnovations.com/api/kb/agent-retry-idempotency","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of (296695 rows).

  1. 0x71d36d397a68f171f1b5954899d151a68144b29dbbefaba9963a8b138edbc9ff
  2. 0x3923658942f7ab7cff1464405ac6bee6a0f9e7835a0c9feb239733bc0f165077
  3. 0xf544d600a5106e9c4ede7c75cbd5a21eb4e5c913260b0aab70c5229a12a12028
  4. 0xcf38a1a444d66861878e9b426b5545b74bb4d1b8cbe5e57a5862f124e055c710
  5. 0xe79c7f47b2c66b82f4b7ef5e8a8417c0147d38905eef67c42a853eb0762b64e6
  6. 0xcd8e2c95b5f9eaa600e151c0484f2ebef21358e732ec8120cb8c7fd8b43e4cc5
  7. 0xb33e3aaa8792e5fc0d3108a3f459ce8dfc12019eb169c7462e2678a1c065230f
  8. 0x18937b05d4b19c36c44460164ffcb340602513e85a48bdbb7cf529e6632f012e
  9. 0xc83e62c51931518b564a7c217d1d80749e64bb26c810f85455006a8f04d5e3c3
  10. 0x7556bb3d28817b67074efa685b0f147185fdbaf6243b748a3e743db60711cd56
  11. 0x170ddfc94752b8644bb33b281e6fa15e2037a7340325b12b704591a5bd5381b4
  12. 0xef1802ec08c5a2efaca6aadccc58edcebeb620a019383dc0785f198c677a9427
  13. 0x06064dc1eb2363bec8c2a752e0a28aafc4bf0cb21d1b1b755821c1575bb77a96
  14. 0xc4fe2177880ea1b0e82b6fe4c270090fd0fbe5af3a42a8cbf6a6ba2fa35625f6
  15. 0x15039087bf60ae9b06b756ec3cbc299760e59923a438bbd91e34d105186db0ed
  16. 0x2b6e23e3624a1b66e1d2298cfbce99a93ce6b13d24a58112a71802d79c5f7a76
  17. 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
  18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
  19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
Day root
0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
Chained
0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
Published
On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae

How to check it · This row as JSON