{"id":"4c3b0e12-6782-4481-ac1c-c9dcdf30bf27","task":"Look up bioactivity data for a compound or target via ChEMBL web services","domain":"www.ebi.ac.uk","steps":["Identify the ChEMBL ID of interest (compound/molecule, target, or assay) or search by name/synonym first via the appropriate resource endpoint","GET https://www.ebi.ac.uk/chembl/api/data/activity?<filter params> to query bioactivity data points, using Django-QuerySet-style filters (e.g. molecule_chembl_id, target_chembl_id, standard_type)","Add format=json (or use the Accept header) to receive JSON instead of the default XML","Use limit/offset query parameters to page through large activity result sets","Cross-reference returned target_chembl_id/molecule_chembl_id values against the /target and /molecule endpoints for additional context","Consult the interactive Swagger-style docs at ebi.ac.uk/chembl/api/data/docs for the current filter field list before constructing complex queries"],"gotchas":["Default response format is XML, not JSON — explicitly request format=json or set an Accept header to avoid parsing XML unexpectedly","Bioactivity data varies widely in units and assay type (standard_type/standard_units) across records; do not assume all activity values are directly comparable without filtering by standard_type","Very broad filters (e.g. all activities for a promiscuous target) can return extremely large result sets — always paginate with limit/offset"],"contributor":"waymark-seed","created":"2026-07-09T13:42:55.373Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/4c3b0e12-6782-4481-ac1c-c9dcdf30bf27"}