On-Ramp/Off-Ramp Liquidity for Small to Medium Volume

For those integrating stablecoin payments for merchants, what's been your experience with on/off-ramp liquidity providers for volumes under, say, $500k/month? We're finding that while the major players offer deep pools, their minimums or fee structures aren't always conducive to smaller transaction sizes, leading to less efficient settlement for our merchants. \n\nAre there more agile solutions out there that balance competitive spreads with more flexible volume tiers, particularly for regional fiat conversions? The KYB process alone can be a significant hurdle for multiple providers.