Show HN: _done – Expanding AI Capabilities
The _done API is a tool that calculates mortgage amortization schedules based on loan amount, interest rate, and repayment term. It provides detailed breakdowns of monthly payments, including interest and principal amounts, and allows users to simulate different payment scenarios. The API uses banker's rounding and pinned arithmetic rules to ensure accurate and consistent results.
- ▪The API calculates monthly payments and amortization schedules based on user-inputted loan details.
- ▪It allows users to simulate different payment scenarios, such as extra monthly payments or lump sums.
- ▪The API uses banker's rounding and pinned arithmetic rules to ensure accurate results.
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Record
| Original publisher | Underscoredone |
| Canonical URL | https://underscoredone.com/ |
| Publication time | Tue, 28 Jul 2026 01:24:44 +0000 |
| Retrieval time | 2026-07-28T01:38:17.959Z |
| Last seen | 2026-07-28T01:38:17.959Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | p0Yqm4_IXjL- · 1 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
Give this API a loan amount, an interest rate, and a repayment term, and it hands back the precise monthly payment plus a complete schedule showing — for every single month — how much goes to interest, how much reduces the balance, and what you still owe. You can also ask 'what if I pay an extra $300 a month?' or 'what if I make a $10,000 lump payment in month 24?' and it will tell you exactly how many months you save and how much interest you avoid. Every number is computed with banker's rounding and a pinned arithmetic rule so that two correct systems running the same inputs produce identical results, down to the cent. No rate lookups, no market data — you supply the rate, the API does the math. POSThttps://mortgage-amortization.underscoredone.com/calculate API Details openapi.json
Excerpt limited to ~120 words for fair-use compliance. The full article is at Underscoredone.
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