asin-check/README.md

# asin-check

Amazon product analysis and lead finder agent. Reads product leads from a CSV/XLSX file, enriches them with Keepa pricing and sales data, caches results in Redis, and runs each product through a local LLM to get an FBA/FBM/SKIP verdict.

## Requirements

- [Bun](https://bun.com) runtime
- Redis (local or Docker)
- [LM Studio](https://lmstudio.ai) running locally with a model loaded
- Keepa API key ([keepa.com](https://keepa.com))
- Amazon SP-API private app credentials (LWA + refresh token + IAM)

## Setup

```bash
bun install
cp .env.example .env
# Edit .env and set your KEEPA_API_KEY and SP-API credentials
```

## Usage

```bash
bun run src/index.ts <input.csv|xlsx> [--out results.csv]
```

Examples:

```bash
bun run src/index.ts leads.xlsx
bun run src/index.ts leads.csv --out results.xlsx
```

Quick SP-API connectivity test:

```bash
bun run src/sp-test.ts
bun run src/sp-test.ts B07SN9BHVV
bun run src/sp-test.ts --sellability B07SN9BHVV
```

## Input file format

Accepts `.csv` or `.xlsx` files. Column names are matched case-insensitively. Required column:

| Column | Aliases |
| ------ | ------- |
| ASIN   | —       |

Optional but recommended:

| Column          | Aliases                      |
| --------------- | ---------------------------- |
| Product Name    | Name, Title                  |
| Unit Cost       | Cost, Price, Buy Cost        |
| Brand           | —                            |
| Category        | —                            |
| Amazon Rank     | Amazon Rank, BSR, Sales Rank |
| FBA NET         | —                            |
| Gross Profit $  | Gross Profit                 |
| Gross Profit %  | —                            |
| MOQ             | Min Order Qty                |
| MOQ Cost        | —                            |
| Total Qty Avail | Qty Available                |
| Link            | URL, Source                  |

Lead-list format aliases (supported):

| Column            | Aliases                                    |
| ----------------- | ------------------------------------------ |
| Name              | Product Name, Title, Product Title         |
| ASIN Link         | ASIN URL, Amazon Link                      |
| Source URL        | Source Link, Supplier URL                  |
| 90 Day Average    | 90-day Average, Avg Price 90d, 90d Average |
| Cost              | Unit Cost, Buy Cost, Price                 |
| Selling Price     | Sale Price, Sell Price                     |
| Net Profit        | Gross Profit                               |
| ROI               | Gross Profit %, Return on Investment       |
| Supplier          | Vendor                                     |
| Promo/Coupon Code | Promo Code, Coupon Code                    |
| Notes             | Note                                       |
| Date              | Lead Date                                  |

Numeric parsing accepts plain numbers as well as formatted values like `$12.50`, `1,209.60`, and `27.5%`.

## Pipeline

1. **Read** — parse input file, validate ASINs
2. **Cache check** — look up each ASIN in Redis (24h TTL by default)
3. **Keepa fetch** — batch all uncached ASINs in a single API call (up to 100 per request)
4. **Enrich** — combine Keepa data with spreadsheet data and SP-API fee estimates
5. **LLM analysis** — send batches of 5 products to LM Studio for FBA/FBM/SKIP verdict
6. **Output** — print results table to console, optionally write CSV/XLSX

## Output columns

ASIN, Name, Brand, Category, Unit Cost, Current Price, Avg Price 90d, Sales Rank, Rank Avg 90d, Sellers, Monthly Sold, Rank Drops 30d, Rank Drops 90d, FBA Net (sheet), Gross Profit $, Gross Profit %, MOQ, MOQ Cost, Qty Available, FBA Fee, FBM Fee, Referral %, Verdict, Confidence, Reasoning

## Environment variables

| Variable                | Default                    | Description                                                             |
| ----------------------- | -------------------------- | ----------------------------------------------------------------------- |
| `KEEPA_API_KEY`         | —                          | **Required.** Keepa API key                                             |
| `SP_API_CLIENT_ID`      | —                          | LWA app client id from Solution Provider Portal                         |
| `SP_API_CLIENT_SECRET`  | —                          | LWA app client secret from Solution Provider Portal                     |
| `SP_API_REFRESH_TOKEN`  | —                          | Refresh token from self-authorization                                   |
| `SP_API_REGION`         | `na`                       | SP-API endpoint region (`na`, `eu`, `fe`; `us` is accepted as `na`)     |
| `SP_API_MARKETPLACE_ID` | `ATVPDKIKX0DER`            | Marketplace id used for pricing and fee calls (default: US)             |
| `SP_API_SELLER_ID`      | —                          | Seller ID used for listing restrictions eligibility checks              |
| `SP_API_USE_SANDBOX`    | `false`                    | Enable SP-API sandbox mode (`true`/`false`)                             |
| `AWS_ACCESS_KEY_ID`     | —                          | AWS credentials for SigV4 signing (required in most private app setups) |
| `AWS_SECRET_ACCESS_KEY` | —                          | AWS credentials for SigV4 signing                                       |
| `AWS_SESSION_TOKEN`     | —                          | Optional session token when using STS credentials                       |
| `REDIS_URL`             | `redis://localhost:6379`   | Redis connection URL                                                    |
| `LLM_URL`               | `http://localhost:1234/v1` | LM Studio API base URL                                                  |
| `LLM_MODEL`             | `default`                  | Model name to pass to LM Studio                                         |
| `CACHE_TTL`             | `86400`                    | Redis cache TTL in seconds                                              |

## Notes

- **Keepa rate limiting**: The client reads `tokensLeft` and `refillRate` from each API response and waits automatically when tokens are exhausted. With a Pro subscription (1 token/min), all 100 ASINs in a batch cost 1 token.
- **Redis is optional**: If Redis is unavailable the tool runs without caching — every run re-fetches from Keepa.
- **SP-API**: `src/sp-api.ts` now uses `amazon-sp-api` to fetch offer pricing and FBA/FBM fee estimates. If SP-API credentials are missing or a call fails, the tool falls back to conservative fee defaults and keeps processing.
- **Sandbox vs production**: When `SP_API_USE_SANDBOX=true`, production ASIN calls can be denied. Use sandbox-compatible test data or set it to `false` for live marketplace connectivity.