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Use when indexing all instances of a contract across all addresses (e.g., all ERC-20 transfers on a chain). Config setup (no address), wildcard handler option, and event.srcAddress.
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Based on SOC occupation classification
Use when processing every block (or every Nth block) for time-series data, periodic snapshots, or block-level aggregations. onBlock API, interval option, and block handler context.
Use when writing or editing config.yaml. Chain/contract structure, addresses, start_block, event selection, field_selection, custom event names, env vars, address_format, schema/output paths, YAML validation, and deprecated options.
Use when making RPC calls, fetch requests, or any external I/O from handlers. Effect API with createEffect, S schema validation, context.effect(), preload optimization (handlers run twice), cache and rateLimit options.
Use when indexing contracts deployed by factory contracts at runtime. contractRegister API, dynamic contract config (no address), async registration, and same-block event coverage.
Use when filtering events by indexed parameters to reduce processing volume. eventFilters with static arrays, dynamic per-chain functions, contract address filtering, and conditional enable/disable.
Use when writing or editing event handlers. Handler registration, context API (entity CRUD, getWhere queries, chain, log), spread updates, indexer runtime API, and common pitfalls.
| name | indexing-wildcard |
| description | Use when indexing all instances of a contract across all addresses (e.g., all ERC-20 transfers on a chain). Config setup (no address), wildcard handler option, and event.srcAddress. |
Index all events matching an event signature across all contract addresses on a chain.
contracts:
- name: ERC20
events:
- event: Transfer(indexed address from, indexed address to, uint256 value)
chains:
- id: 1
contracts:
- name: ERC20
# No address = wildcard (indexes ALL matching events on the chain)
wildcard: truePass wildcard: true as the handler's 2nd argument. Use event.srcAddress to identify which contract emitted the event:
ERC20.Transfer.handler(
async ({ event, context }) => {
const tokenAddress = event.srcAddress; // The actual contract address
const id = `${event.chainId}-${event.transaction.hash}-${event.logIndex}`;
context.Transfer.set({
id,
token_id: `${event.chainId}-${tokenAddress}`,
from: event.params.from,
to: event.params.to,
value: event.params.value,
});
},
{ wildcard: true }
);
Wildcard indexing produces high event volume. Use eventFilters to reduce it — see the indexing-filters skill for array, function, and addresses forms.
ERC20.Transfer.handler(
async ({ event, context }) => { /* ... */ },
{
wildcard: true,
eventFilters: [{ from: ZERO_ADDRESS }],
}
);
Full reference: https://docs.envio.dev/docs/HyperIndex-LLM/hyperindex-complete