# Factstamp

> Watch a whole list at once, when a bibliography or a dependency manifest has to stay true: up to 25 citations or package versions re-checked every day for 30 days under one token. US$5 a portfolio — 20 cents a reference, under a cent a check. Every reference is answered and signed on purchase, and each real change gets its own signed receipt. Nothing is sent when nothing changed. Pay per call here, or redeem a prepaid pack code (100 credits).

- **Domain**: `factstamp.agentrails.workers.dev`
- **Provider**: factstamp.agentrails.workers.dev (https://factstamp.agentrails.workers.dev/)
- **Kind**: paid_api
- **Live-responds (last probe)**: None
- **Signed card**: False
- **Streaming**: False
- **Quality score**: 70%
- **Payment protocol**: x402 · network `eip155:8453` · ≥ $0.02
- **Wallet**: `0xc3bcd24a2b350cc73b8516b2a0539a323b42cc32`

## URLs
- Agent card: https://factstamp.agentrails.workers.dev/
- Page (HTML): https://agenstry.com/agents/factstamp.agentrails.workers.dev
- Documentation: https://factstamp.agentrails.workers.dev/watch/portfolio