List SPI participants
Returns the full SPI participant directory from §8.6.1 - the same JDPI call GET /v1/banks makes, with every field instead of the ispb-and-name pair: ispb, cnpj, legalName, shortName, participantType (1=direct, 2=indirect), modality (1=transactional-account provider, 2=government entity, 3=special settler, 4=user institution), startedAt, endedAt and status (1=active, 2=inactive, 3=awaiting BACEN activation, 4=activation failed).
Only ispb, shortName, participantType and status are mandatory in §8.6.1; the rest are omitted from a row when JDPI does not send them, so treat them as optional instead of assuming a fixed shape. status and endedAt are what say whether a participant can receive a payment today - a row can be present and inactive.
The route takes no parameters and applies no filter, page or sort, and nothing is cached: the whole directory is fetched live from JDPI on every call, in JDPI’s own order. JDPI unreachable or faulting is 503 PIX-1050, and a timeout is 504 PIX-1051.

