# Neuraforage

- **Event:** [Meta Global AI Developer Hackathon](https://cerebralvalley.ai/e/meta-ai-developer-hackathon)
- **When:** Oct 26, 12:00 PM – Nov 4, 9:00 PM (EST)
- **Where:** Online
- **Team:** [Manasa L Hegde](https://cerebralvalley.ai/u/manasalshegde)
- **GitHub:** https://github.com/Manasa-L-Hegde/billback
- **Demo video:** https://youtu.be/fIcUf14Jjds
- **Gallery:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/752

BillBack: An agent that acts, and knows when it can't.

Small businesses and kirana stores lose money to billing discrepancies because the real agreement lives in a WhatsApp chat or voice note, proof of delivery is a paper challan, and the invoice is a photo. With no enterprise ERP, checking bills requires cross-referencing three messy sources by hand, and owners rarely have the time to calculate compounding tax errors or negotiate settlements.

BillBack is an autonomous agent that:
1. Multimodal Ingestion: Reads invoices, delivery challans, and WhatsApp rate screenshots using Meta's muse-spark-1.3 vision model.
2. Zero-Hallucination Audit: Overcharge calculations, line math (qty × rate), and 5% tax-on-overcharge are evaluated strictly by deterministic Python—eliminating any risk of LLM arithmetic hallucinations.
3. Multi-Round Autonomous Negotiation: Drafts itemized dispute emails with arithmetic proof and conducts up to 3 rounds of simulated negotiation. It enforces an 80% recovery floor: if vendor offers fall short, it safely escalates to human decision (Recovered: ₹0.00).
4. Refusal Guardrail: If given an unpriced document (e.g. a shipping label like hck.jpeg), the Extraction Guard detects missing rates and halts into an amber "needs_review" card—never certifying a bill it cannot read reliably.

## More from Meta Global AI Developer Hackathon

- [SMAJ Ecosystem](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/749)
- [Beyonder](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/750)
- [binaryEXE](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/751)
- [AIBOSSPRO](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/753)
- [Watson](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/754)
- [StarVijay](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/755)

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Markdown version of https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/752. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt