Saylor Innovations Data Desk

Name: Saylor Innovations Data Desk
Price: 0.01 USDC
Availability: InStock

Reverse a 4-byte function selector or 32-byte event topic into its signature from a built-in list of 120 common token, NFT, DEX and lending signatures.

TradingLiveeip155:8453Exactvia cdp

https://saylorinnovations.com/api/chain/signature-lookup

Reverse function selectorTopic0 to event nameWhat is this selector4byte lookupDecode unknown log

Calls · 30d

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 6 snapshots so far.

$15.76

Verified settled volume

1,657 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.

Calls · 30d

Upstream's own call count for this endpoint, not ours.

Unique payers · 30d

Last called 2026-10-23 00:51Z

—

Upstream on-chain volume

Reported by the source catalog.

Paid to

0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa

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.

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:datadesk:chain-signature-",
        "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": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
      "extra": {
        "memo": "saylor:datadesk:chain-signature-",
        "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",
        "facilitatorOnly": true,
        "assetTransferMethod": "eip3009"
      },
      "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 120
    },
    {
      "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
      "extra": {
        "memo": "saylor:datadesk:chain-signature-",
        "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",
        "facilitatorOnly": true,
        "assetTransferMethod": "eip3009"
      },
      "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:42161",
      "maxTimeoutSeconds": 120
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "memo": "saylor:datadesk:chain-signature-",
        "session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpjaGFpbi1zaWduYXR1cmUtbG9va3VwIiwicmVmZXJlbmNlIjoiRXVGZW1EQkRaaXA2SnZaNFhYZ0hQM3R2QkZ0QWVCQXc2WHlFNHZkQWRHNDciLCJyZWNpcGllbnQiOiI3TFNqZnJKZjhmTnNCOFZBOXU3TjNXRW4yNXNtUUxwb2IzU3Z5VXZYYWN5NyIsIm1pbnQiOiJFUGpGV2RkNUF1ZnFTU3FlTTJxTjF4enliYXBDOEc0d0VHR2tad3lURHQxdiIsIm1pbkFtb3VudCI6MTAwMDAsImV4cCI6MTc5MjU1ODA2MDA2NH0.aoaGoN0t0-BR8rwpev733ku9J5Q6InZLZ9BR6SXUJWA",
        "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88",
        "reference": "EuFemDBDZip6JvZ4XXgHP3tvBFtAeBAw6XyE4vdAdG47"
      },
      "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
      "amount": "10000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 120
    },
    {
      "asset": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB",
      "extra": {
        "memo": "saylor:datadesk:chain-signature-",
        "session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpjaGFpbi1zaWduYXR1cmUtbG9va3VwIiwicmVmZXJlbmNlIjoiSGE2S2Zpcm5MVEVubVh0elZ1M3ZkYVU3OWNQNUw1aEJIUFR4alZlQzZzemkiLCJyZWNpcGllbnQiOiI3TFNqZnJKZjhmTnNCOFZBOXU3TjNXRW4yNXNtUUxwb2IzU3Z5VXZYYWN5NyIsIm1pbnQiOiJFczl2TUZyemFDRVJtSmZyRjRIMkZZRDRLQ29Oa1kxMU1jQ2U4QmVud05ZQiIsIm1pbkFtb3VudCI6MTAwMDAsImV4cCI6MTc5MjU1ODA2MDA2NH0.WxpP9tGSYQZU-jsi-QDeo7VS33R3R02mui9bfpWSfY8",
        "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88",
        "reference": "Ha6KfirnLTEnmXtzVu3vdaU79cP5L5hBHPTxjVeC6szi"
      },
      "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
      "amount": "10000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 120
    },
    {
      "asset": "So11111111111111111111111111111111111111112",
      "extra": {
        "memo": "saylor:datadesk:chain-signature-",
        "note": "Native SOL: send lamports with a system transfer, not an SPL transfer. Price is quoted live and this quote expires in 120s.",
        "native": true,
        "session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpjaGFpbi1zaWduYXR1cmUtbG9va3VwIiwicmVmZXJlbmNlIjoiNGtOeE5jN2tXY1NTakh3OExEZUhnTlN2NHNnVzR4SHhiMmFYSDR5UnJnZGEiLCJyZWNpcGllbnQiOiI3TFNqZnJKZjhmTnNCOFZBOXU3TjNXRW4yNXNtUUxwb2IzU3Z5VXZYYWN5NyIsIm1pbnQiOm51bGwsIm1pbkFtb3VudCI6OTE4MTIsImV4cCI6MTc5MjU1ODA2MDA2NH0.e78u_cf4GJ2oJbtQdO44DLVDXsFvwUoo2-UQvIE6N7c",
        "reference": "4kNxNc7kWcSSjHw8LDeHgNSv4sgW4xHxb2aXH4yRrgda",
        "solUsdPrice": 105.65,
        "quotedLamports": "94652"
      },
      "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
      "amount": "91812",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://saylorinnovations.com/api/chain/signature-lookup?hash=0x095ea7b3",
    "tags": [
      "reverse function selector",
      "topic0 to event name",
      "what is this selector",
      "4byte lookup",
      "decode unknown log"
    ],
    "iconUrl": "https://saylorinnovations.com/og-image.jpg",
    "mimeType": "application/json",
    "description": "Reverse a 4-byte function selector or 32-byte event topic into its signature from a built-in list of 120 common token, NFT, DEX and lending signatures.",
    "serviceName": "Saylor Innovations Data Desk"
  },
  "extensions": {
    "tags": [
      "reverse function selector",
      "topic0 to event name",
      "what is this selector",
      "4byte lookup",
      "decode unknown log"
    ],
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "hash": "0x095ea7b3"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "hash": "0x095ea7b3",
            "kind": "function selector (4 bytes)",
            "note": "Matched against a built-in list of common token, NFT, DEX, lending, proxy, Safe and ENS signatures. Several signatures can share a 4-byte selector, so confirm against the contract.",
            "found": true,
            "source": "Built-in signature list (computed locally with keccak256)",
            "matches": [
              {
                "kind": "function",
                "signature": "approve(address,uint256)"
              }
            ],
            "database_size": 120
          }
        }
      },
      "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"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "hash"
                ],
                "properties": {
                  "hash": {
                    "type": "string",
                    "description": "a 4-byte function selector (0x095ea7b3) or a 32-byte event topic0 (0xddf252ad...)"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "json"
              },
              "example": {
                "type": "object",
                "required": [
                  "hash",
                  "kind",
                  "found",
                  "matches",
                  "database_size",
                  "note",
                  "source"
                ],
                "properties": {
                  "hash": {
                    "type": "string",
                    "description": "the selector or topic looked up"
                  },
                  "kind": {
                    "type": "string",
                    "description": "function selector or event topic0"
                  },
                  "note": {
                    "type": "string",
                    "description": "plain-language reading of the result"
                  },
                  "found": {
                    "type": "boolean",
                    "description": "true when a signature matched"
                  },
                  "source": {
                    "type": "string",
                    "description": "where the data was read from or how it was computed"
                  },
                  "matches": {
                    "type": [
                      "array",
                      "null"
                    ],
                    "items": {
                      "type": "object",
                      "properties": {
                        "kind": {
                          "type": [
                            "string",
                            "null"
                          ],
                          "description": "function or event"
                        },
                        "signature": {
                          "type": [
                            "string",
                            "null"
                          ],
                          "description": "the matching signature"
                        }
                      }
                    },
                    "description": "matching signatures"
                  },
                  "database_size": {
                    "type": "number",
                    "description": "entries in the built-in list"
                  }
                }
              }
            }
          }
        }
      }
    },
    "method": "GET",
    "example": {
      "hash": "0x095ea7b3",
      "kind": "function selector (4 bytes)",
      "note": "Matched against a built-in list of common token, NFT, DEX, lending, proxy, Safe and ENS signatures. Several signatures can share a 4-byte selector, so confirm against the contract.",
      "found": true,
      "source": "Built-in signature list (computed locally with keccak256)",
      "matches": [
        {
          "kind": "function",
          "signature": "approve(address,uint256)"
        }
      ],
      "database_size": 120
    },
    "license": "LicenseRef-Saylor-Agent-Use-1.0",
    "mimeType": "application/json",
    "freshness": "fetched live (cached up to 1 hour for large reference files)",
    "tokenCount": null,
    "inputSchema": {
      "hash": "a 4-byte function selector (0x095ea7b3) or a 32-byte event topic0 (0xddf252ad...)"
    },
    "serviceName": "Saylor Innovations Data Desk",
    "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": [
        "hash",
        "kind",
        "found",
        "matches",
        "database_size",
        "note",
        "source"
      ],
      "properties": {
        "hash": {
          "type": "string",
          "description": "the selector or topic looked up"
        },
        "kind": {
          "type": "string",
          "description": "function selector or event topic0"
        },
        "note": {
          "type": "string",
          "description": "plain-language reading of the result"
        },
        "found": {
          "type": "boolean",
          "description": "true when a signature matched"
        },
        "source": {
          "type": "string",
          "description": "where the data was read from or how it was computed"
        },
        "matches": {
          "type": [
            "array",
            "null"
          ],
          "items": {
            "type": "object",
            "properties": {
              "kind": {
                "type": [
                  "string",
                  "null"
                ],
                "description": "function or event"
              },
              "signature": {
                "type": [
                  "string",
                  "null"
                ],
                "description": "the matching signature"
              }
            }
          },
          "description": "matching signatures"
        },
        "database_size": {
          "type": "number",
          "description": "entries in the built-in list"
        }
      }
    },
    "noPathTemplate": true,
    "settlementModes": [
      "facilitator-transaction",
      "self-submitted-reference"
    ],
    "typicalLatencyMs": 700
  },
  "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.

0.01USDC≈ $0.01 USD

on Base · exact scheme

Pay 0.01 USDC on Base to 0xA2A8…fc8aa. The signed payment is good for 2 minutes.

Paid to: 0xA2A8…fc8aa
USD Coin contract: 0x8335…02913
Payment window: 2 minutes
As published: 10000 smallest units

10000units

on Polygon · exact scheme