Visa Trusted Agent Protocol
./PayOpen framework using HTTP Message Signatures (RFC 9421) so merchants can recognize and trust a legitimate agent before it transacts
OpenAPITAP
$ protocol support
[✗]MCP Server
[✓]OpenAPI Spec
[✗]Skill File
[✗]llms.txt
[✗]Structured Feed
$ payment protocols
TAPTrusted Agent ProtocolVisa · authorization
HTTP Message Signatures (RFC 9421) that let a merchant recognise a legitimate agent before it transacts
$ agent access
authNo Auth
onboardingPartial — dashboard signup, then API key
tosExplicitly welcomes bots
webhooksNo
free tierYes
billingfree
#tap#agent-identity#http-signatures#visa#protocol
https://developer.visa.com/capabilities/trusted-agent-protocol
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