{"name":"Dueback","description":"Outcome-based bill negotiation. Give Dueback bill facts; it negotiates with the provider and returns verified savings. Free to try — the user pays only a share of verified savings, and nothing happens without their explicit approval.","url":"https://api.dueback.co/a2a","version":"1.0.0","protocolVersion":"1.0","capabilities":{"streaming":true,"pushNotifications":false,"stateTransitionHistory":false},"defaultInputModes":["text"],"defaultOutputModes":["text"],"skills":[{"id":"negotiate-bill","name":"Negotiate a bill","description":"Detect whether a bill is negotiable and open a negotiation case. Input: bill description, provider, amounts. Output: case status and verified savings.","tags":["bills","negotiation","savings","personal-finance"],"examples":["Negotiate my $120 cable bill","My electricity bill went up 30%, can you lower it?"]}],"authentication":{"schemes":["bearer"],"description":"Per-user Dueback API key as an HTTP Authorization: Bearer <redacted> header, or `api_key` inside the JSON-RPC request metadata."}}