ProPay:
No application needed: No
Transparent pricing: Yes
No monthly fee: No
Reasonable per-transaction percentages: Yes (2.4%)
No bad reputation: Yes
Targets micro businesses: Yes
Payment button+IPN API: Yes (https://www.propay.com/en-US/Documents/API-Docs/ProtectPay-PMI-Hosted-Payment-Page-Manual)
Can followup further transactions with https://www.propay.com/en-US/Documents/API-Docs/ProtectPay-API-Manual-REST
Local payments API: Yes (https://www.propay.com/en-US/Documents/API-Docs/ProPay-API-Manual-REST)
Reasonably modern website: Yes
Reasonably stable business: Yes
International: Yes
No bank merchant account needed: Yes
Supports subscriptions: Not really (have to use ProtectPay to charge followup transactions ourselves)
Supported by PHP Omnipay library: No