Contract discovery

Find every contract that conforms to a token standard — "all SIP-010 tokens", "all SIP-009 NFTs" — without maintaining a list of addresses. Secondlayer keeps a registry of deployed contracts and classifies each against SIP-009 / SIP-010 / SIP-013, both by parsing declared (impl-trait …) and by statically matching the contract's ABI shape (so contracts that conform without declaring the trait are caught too).

curl https://api.secondlayer.tools/v1/contracts \
  -G -d "trait=sip-010" -d "conformance=any"

{
  "contracts": [
    {
      "contract_id": "SP3K8BC0PPEVCV7NZ6QSRWPQ2JE9E5B6N3PA0KBR9.usda-token",
      "deployer": "SP3K8BC0PPEVCV7NZ6QSRWPQ2JE9E5B6N3PA0KBR9",
      "block_height": 21000,
      "declared_traits": ["sip-010"],
      "inferred_standards": ["sip-010"],
      "abi_status": "fetched"
    }
  ],
  "next_cursor": "SP3K8BC0PPEVCV7NZ6QSRWPQ2JE9E5B6N3PA0KBR9.usda-token"
}

Reads are public. Cursor-paginate by passing the previous response's next_cursor (it's null on the last page).

The same classification powers trait-scoped Subgraph sources — point a source at a standard instead of a contract and it indexes every conforming contract, including ones deployed later:

sources: {
  tokens: { type: "ft_transfer", trait: "sip-010" }, // no contract address
}