What is a tontine?
In Francophone West Africa, a tontine is a rotating savings association: members — very often market women — contribute on a fixed rhythm and take the pool in turns. The word needs disambiguation: the historical European tontine was a 17th-century survivorship annuity (named after Lorenzo de Tonti) in which the income of deceased subscribers accrued to survivors — a different instrument that shares only the name.
Also known as: natt (Wolof, Senegal) · njangi / djanggi (Cameroon) · tontine enchère (auction tontine). It is one of 70+ regional forms of the ROSCA — rotating savings and credit association — used by an estimated 2+ billion people worldwide.
How a tontine works
- A group with an existing bond — a market, a church, a hometown association — agrees on contributions and rhythm, from daily to monthly.
- The pool rotates by agreed order; in Cameroon, auction variants (tontine enchère) let members bid for early turns, and many tontines run a parallel solidarity fund for emergencies.
- A respected member keeps the book; meetings double as social and business gatherings.
Role and reach
Tontines dominate informal finance across Francophone West Africa — studies of markets in Dakar or Douala routinely find that a majority of traders participate in at least one. Cameroon’s tontine culture is especially elaborate: multi-level associations with rotating pools, loan funds and insurance-like solidarity pots operating side by side.
The European namesake matters mainly as a warning label: survivorship tontines were banned or heavily restricted in US and UK insurance a century ago, so English-language readers sometimes assume "tontine" implies something illegal. The African institution is a plain ROSCA — legal, widespread and, in several countries, acknowledged in microfinance policy.
How it differs from other ROSCAs
- Frequently layered: rotating pool + loan fund + solidarity fund in one association, where a classic ROSCA is the pool alone.
- Auction variants exist (tontine enchère) — like Indian chit funds, proof that pricing the payout order is a natural evolution.
- The name collides with an unrelated European annuity, which confuses search results and reputations.
The digital version
ROSCASH is closest to the tontine enchère: the payout order is auctioned each round — but with the book kept on a public blockchain instead of by one trusted treasurer.
The mechanics are documented in the circle guide, and the honest questions — custody, "is this a pyramid?", where returns come from — in the FAQ.
See how ROSCASH circles work →