Payment Schemes
Payment Schemes
Choose between exact, upto, and batch-settlement — fixed-price, metered, and high-frequency payment models.
Every x402 payment requirement names a scheme — the scheme field determines what the payer signs and how settlement executes on-chain. Solvador supports three schemes.
Comparison
| Scheme | Networks | The payer signs | Best for |
|---|---|---|---|
exact | All 14 networks | A fixed amount | Fixed per-request pricing |
upto | 11 EVM networks | A maximum; you settle actual usage | Metered, usage-based pricing |
batch-settlement | 11 EVM networks | A deposit into an escrow channel, then off-chain vouchers | High-frequency micropayments |
How to choose
- Start with
exact. It is the standard x402 scheme, works on every network Solvador supports, and fits any “one request, one price” API. - Use
uptowhen the price isn’t known up front — per-token LLM billing, per-second streaming, per-byte transfer. The payer authorizes a ceiling and you settle only what was consumed. - Use
batch-settlementwhen per-request settlement is too expensive — thousands of sub-cent requests from the same payer, redeemed in a single on-chain claim.