Doesnt Bitpay have the same service as your project? They also dont like offchain solutions and have made sure that everything stays onchain by adding BCH in their accepted coins because its more scalable.
What would be your technical advantage over Bitpay?
Yeah BitPay is on-chain solution but it's for ordinary payment transactions, not for instant transactions. Online merchants using BitPay need to be sure their incoming transactions are confirmed thats because buyers can double-spend their unconfirmed payments.
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https://support.bitpay.com/hc/en-us/articles/115002990823-How-do-I-prevent-double-spend-fraud-on-unconfirmed-payments-BitPay is for online merchants not for physical merchants this is done so when you make a bitcoin payment for e-commerce with BitPay it does not matter when your transaction will be mined. Let say you bought something online through BitPay and your transaction is confirmed 3 hours later, once its confirmed then online merchant post your order. In the contrast way in terms of physical commerce it's essential to make instant payments because nobody would wait for 10 minute to buy a cup of coffee from a local store. That's why bitcoin is only used for a store of value and investment tool rather than used for daily payments.