Output

StreamingFast Substreams module outputs

Output overview

Substreams map modules support a single output. The output must be a protobuf populated by data acquired inside the map module. If the module intends to provide a basic output type of a single value, such as a String or bool, a protobuf is still required. The single value needs to be wrapped in a protobuf for use as the output value from a map module.

Note: store modules cannot define an output.

An output object has a type attribute defining the type of the output for the map module. The output definition is located in the Substreams manifest, within the module definition.

output:
  type: proto:eth.erc721.v1.Transfers