Correios vs Pixela

Correios exposes a REST API suite covering package tracking (Rastro), address lookup (Busca CEP), shipping cost (Preço), and delivery-time estimates (Prazo) for Brazil's national postal service. Access is gated behind a commercial shipping contract rather than public self-serve signup, with keys issued and validated through the CWS (Correios Web Services) portal under a Meu Correios login. A 2026 security tightening now restricts tracking queries to parcels tied to the querying contract, closing off third-party lookups of packages a caller didn't send.

Pixela is a single-developer, open-source habit- and effort-tracking service: every action goes through its REST API, turning daily counts, weight logs, or commit streaks into a GitHub-contribution-style graph. Callers register with a self-chosen token via `/v1/users`, then post daily values that render back as an embeddable SVG graph or badge — no dashboard beyond the API itself. Nearly every feature is free; a handful of extras (logo placement, priority support) are reserved for Patreon backers.