In short
Prepaid tokens meter billable API actions such as validation, account linking, publish legs, and webhooks so cost tracks real publishing volume instead of forcing a large fixed subscription before traffic exists.
Social publishing volume is uneven: a new product may publish a handful of posts while testing, then ramp as customers connect accounts.
Token metering maps cleanly to discrete actions—validate payload, complete a connection, publish one network leg, register a webhook—so platforms can predict cost from product metrics.
Social Relay publishes a rate card for those actions and maintains a token ledger per platform account. Operators can credit balances during early access until self-serve checkout is available.
Tokens are usage credits for the service, not cash deposits or investment instruments.