# Purserhouse

> Purserhouse is for US small and mid-size importers of goods made in China, and the customs brokers who serve them. Send a CBP Form 7501 and learn which entries and Chapter 99 lines fall inside the IEEPA refund window, the duty printed on them, and the tariff layers for the next shipment with their status. Send a demurrage and detention (D&D) invoice and learn whether it was computed right against the carrier's published US tariff, the real last free day, the basis for a dispute, and a draft letter. Every number has a cited source (CBP, Federal Register, eCFR, USTR, DHS, the carrier's own tariff); the language model only reads documents and never makes a number. Missing data is "not checked", never guessed. The calculators and lookups are free and need no key.

What Purserhouse does not do:

- It is not a customs broker or a law firm; answers are not legal advice.
- It does not file in CAPE, file an ISF or entry, or send disputes to carriers: it drafts the letter, you send it.
- It does not republish carrier or port tariff rates; it applies them to your own documents and links the source.
- It is not a general US tariff or landed-cost calculator: it lists duty layers with their status, not a total, and does not compute refund interest.

Links are relative to https://purserhouse.com. Most pages also exist as Markdown at the page URL plus `index.md` (e.g. /en/ieepa-refund/calculator/index.md).

## Questions people ask, and where the answer is

### IEEPA tariff refund

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- [IEEPA tariff refund guide](/en/ieepa-refund/): what CBP's CAPE process accepts, who can file, how long it takes, interest, and which entries the current phase excludes (liquidation).
- [IEEPA refund calculator](/en/ieepa-refund/calculator/): entry date, origin and the 7501's Chapter 99 lines in; each line inside the window, outside, or not checked, and the sum of duty printed.
- [IEEPA refund HTS codes](/en/ieepa-refund/hts-codes/): the 9903 headings for IEEPA duties on goods from China, Hong Kong and Macau, with entry dates, status and CBP source.

### Tariff stacking and duty on goods from China

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- [Tariff stacking order and lookup](/en/tariff/stacking/): the order CBP wants Chapter 99 numbers on the entry summary, and the layers in force for an HTS code, origin and date, each with status and source. No total.
- Chinese: "美国301关税查询", "一文读懂美国的301 232 201 338 122关税条款" → /zh/tariff/stacking/

### Section 232 and Section 301

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- [Section 232 by product group](/en/tariff/section-232/hts-list/): generated from our us_s232 list: status, Chapter 99 headings, rate as stated, value basis (full value or metal content), HTS prefixes per group, CSV download at /files/section-232-hts.csv.
- [Section 232 vs IEEPA](/en/tariff/section-232-vs-ieepa/): legal basis, stacking, USMCA, and why refunds cover IEEPA only.
- [Section 301 China exclusions](/en/tariff/section-301/exclusions/): which exclusions are in force and until when, their 9903 headings, and where USTR's product list is.

### HTS code by description, CROSS and binding rulings

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- [HTS code lookup](/en/hs/): a product description or an HTS number (6+ digits) in; up to 3 suggested codes to check, the schedule's heading text and the newest CBP CROSS rulings out; and how to get from a description to a code (GRI, CROSS, binding ruling).
- [Binding ruling request](/en/hs/binding-ruling/): who may ask CBP (19 CFR part 177), what to include, how to submit, CBP's stated timing and fee, a template.

### Last free day and free time

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- [Last free day calculator](/en/demurrage/last-free-day/): carrier, US port and discharge date in; the last free day under the carrier's published US tariff out, with free days, calendar or working days, and the dates not counted.
- Carrier US tariff pages: [Maersk](/en/demurrage/maersk/us/), [MSC](/en/demurrage/msc/us/), [Hapag-Lloyd](/en/demurrage/hapag-lloyd/us/), [ZIM](/en/demurrage/zim/us/), [ONE](/en/demurrage/one/us/), [Evergreen](/en/demurrage/evergreen/us/), [CMA CGM](/en/demurrage/cma-cgm/us/), [COSCO](/en/demurrage/cosco/us/), [Yang Ming](/en/demurrage/yang-ming/us/), [HMM](/en/demurrage/hmm/us/), [OOCL](/en/demurrage/oocl/us/) (its tariff is not in our data); overview /en/demurrage/.
- Chinese: "滞箱费是怎么产生的" → /zh/demurrage/, /zh/demurrage/last-free-day/

### Demurrage vs detention, and who pays

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- [Demurrage vs detention vs per diem vs storage](/en/demurrage/vs/): what each charge means, who charges it, when the clock runs, who is billed; also wharfage and quay rent.
- [Who pays demurrage](/en/demurrage/who-pays/): Incoterms (DAP, CIF, CFR, FOB, DDP) against who the carrier actually bills, and what the FMC billing rule requires.

### Demurrage disputes and letters, by carrier

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- [Dispute letter tool](/en/demurrage/letter/): invoice figures in; checked against each other and the carrier's tariff where we hold it; a draft dispute or waiver letter out, for you to send.
- What a US D&D invoice must show (46 CFR 541.6) and the carrier's own dispute instructions: [Hapag-Lloyd](/en/demurrage/hapag-lloyd/dispute/), [Maersk](/en/demurrage/maersk/dispute/), [MSC](/en/demurrage/msc/dispute/), [ZIM](/en/demurrage/zim/dispute/), [ONE](/en/demurrage/one/dispute/), [Evergreen](/en/demurrage/evergreen/dispute/), [CMA CGM](/en/demurrage/cma-cgm/dispute/), [COSCO](/en/demurrage/cosco/dispute/), [Yang Ming](/en/demurrage/yang-ming/dispute/), [HMM](/en/demurrage/hmm/dispute/), [OOCL](/en/demurrage/oocl/dispute/). Carrier overviews: /en/demurrage/evergreen/, /en/demurrage/cma-cgm/, /en/demurrage/cosco/, /en/demurrage/yang-ming/, /en/demurrage/hmm/, /en/demurrage/oocl/ (OOCL: its tariff is not in our data).

### Ports, rail and FMC rules

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- Port pages (terminals, where each publishes its tariff; no rates copied): [Los Angeles/Long Beach](/en/demurrage/los-angeles-long-beach/), [Houston](/en/demurrage/houston/), [Savannah](/en/demurrage/savannah/), [New York/New Jersey](/en/demurrage/new-york-new-jersey/).
- [Rail intermodal storage](/en/demurrage/rail/): how ramp storage differs from ocean demurrage, and where [BNSF](/en/demurrage/rail/bnsf/), [Union Pacific](/en/demurrage/rail/up/) and [Norfolk Southern](/en/demurrage/rail/ns/) publish their rules. Not in the calculator.
- [FMC demurrage and detention rules](/en/fmc/): the reasonableness rule, the 46 CFR part 541 billing requirements, which section a court set aside, and charge complaints.

### ISF (10+2)

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- [ISF filing requirements](/en/isf/): who files, the ten importer elements, when, and what is not covered (air cargo is not an ISF filing).
- [ISF checklist and template](/en/isf/checklist/): the ten elements, who usually holds each, and a spreadsheet [template](/files/isf-template.xlsx).
- [ISF late filing penalty](/en/isf/late-penalty/): late or inaccurate filings, the bond claim, CBP's mitigation, holds, petitions.
- [ISF bond](/en/isf/bond/): which bonds secure an ISF, the stand-alone ISF bond, who is exempt.
- [ISF status codes](/en/isf/status-codes/): accepted, rejected, no bill on file, bill match codes and holds, and what to do.
- Chinese: "isf申报需要哪些信息", "isf申报时间", "isf申报模板" → /zh/isf/, /zh/isf/checklist/

### UFLPA

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- [UFLPA for importers](/en/uflpa/): the rebuttable presumption, the Entity List, detentions.
- [UFLPA Entity List](/en/uflpa/entity-list/): the DHS list as a filterable table, section of the Act and effective date, newest first.
- [UFLPA detention](/en/uflpa/detention/): the 19 CFR 151.16 timelines, the three paths (export, applicability review, exception request), the documents CBP lists.
- [UFLPA supplier check](/en/uflpa/check/): a supplier name against the Entity List and our screening lists. A match is a lead; no match is not a clearance.

### Amazon FBA from China

"fba international shipping customs charge", "shipping from china to amazon fba", "shipping directly to amazon fba from china", "alibaba ship to fba"

- [Shipping from China to Amazon FBA](/en/fba/shipping-from-china/): importer of record, ISF, duty layers, the de minimis suspension, demurrage. Purserhouse is not a forwarder.

## Free tools (no key)

JSON, nothing stored, no model called (except `hs` with `q`: the model proposes codes only), same rules as a customer case. 30 requests per 10 minutes per address (`screen`: 10). Every answer has `sources` and `test_mode`; `null`, `not_checked` or `computed: false` means not calculated.

- `POST /api/public/refund-check` — `entry_date`, `origin`, `lines[].hts` (optional `duty`; up to 50 lines) → per line `in_refund_window` / `not_in_window` / `not_checked` with rate, refund condition, phase, legal reference, source URL; `total_in_window`. Page: /en/ieepa-refund/calculator/
- `GET /api/public/last-free-day` — `carrier` (SCAC or name), `port` (US UN/LOCODE), `arrival`; optional `container` (20/40/45) → `last_free_day`, `free_days`, `day_basis`, `skipped_dates`, tariff section, source URL, or `computed: false` with the reason. Page: /en/demurrage/last-free-day/
- `GET /api/public/tariff-stack` — `hts`, `origin`; optional `date` → base rate and layers in force with status, legal reference, source URL, and CBP's reporting order. No total. Page: /en/tariff/stacking/
- tariff-stack lists Section 232 layers with heading and value_basis; a number our list does not cover is "not checked", never "not subject".
- `POST /api/public/screen` — `name`; optional `country` → possible matches on the lists we carry. Page: /en/uflpa/check/
- HS lookup: `GET /api/public/hs?q=<product description>` (or `?code=`) — up to 3 suggested HTS codes to check (model proposes codes only, checked against the tariff tables), up to 5 matches of the schedule's wording, heading text and CBP CROSS rulings; suggestions, not a classification. MCP: `lanebrief_hs_rulings` (`query`). Page: /en/hs/
- `POST /api/public/dd-letter` — `carrier`, `port`, `arrival_date`, `charge_kind` (demurrage/detention/combined/storage), `amount`, `currency` → findings and draft dispute, extension or waiver letters. Page: /en/demurrage/letter/
- `POST /api/public/isf-check` (MCP `lanebrief_isf_check`): which of the ten importer ISF elements of 19 CFR 149.3(a) are given or missing, and whether each HTSUS number has six digits and is in the HTS; JSON or the filled template /files/isf-template.xlsx (multipart field `file`, 1 MB). Presence and format, not truth. Page: /en/isf/checklist/

```bash
curl -s -X POST https://purserhouse.com/api/public/refund-check -H 'Content-Type: application/json' \
  -d '{"entry_date":"2025-12-01","origin":"CN","lines":[{"hts":"9903.01.24","duty":"1250.00"}]}'
curl -s 'https://purserhouse.com/api/public/last-free-day?carrier=MAEU&port=USLAX&arrival=2026-11-20&container=40'
```

## For agents

- MCP: Streamable HTTP (JSON-RPC 2.0) at `POST /mcp`; server card /.well-known/mcp.json.
- No key: `lanebrief_refund_check`, `lanebrief_last_free_day`, `lanebrief_tariff_stack`, `lanebrief_screen`, `lanebrief_hs_rulings`, `lanebrief_dd_letter`, `lanebrief_isf_check`, `lanebrief_market_snapshot`, `lanebrief_coverage`, `lanebrief_request_access`.
- Key (`Bearer lb_live_...`, issued after a person approves an access request): `lanebrief_grant_consent`, `lanebrief_submit_documents`, `lanebrief_get_result`, `lanebrief_get_details`, `lanebrief_account`; REST mirror under `/api/v1`.
- [Purserhouse for AI agents](/en/agents/) · [OpenAPI](/openapi.yaml)

## Send a document

- Send a document (no account; emailed link to the result; files deleted after 7 days): [/en/send/](/en/send/) , [/zh/send/](/zh/send/)
- Back from a 7501: each Chapter 99 line against the refund window, duty printed, what to check in ACE (liquidation status), next-shipment layers. From a D&D invoice: the last free day (carrier tariff, US federal holidays), each charge band re-checked, the dispute basis, a draft letter.

## Languages

- English (`/en/`): everything above.
- Chinese (`/zh/`): IEEPA refund guide, calculator and HTS codes; demurrage overview and last free day calculator; ISF requirements and checklist; tariff layers and stacking; send a document; data, privacy, request.
- Arabic (`/ar/`) exists but is no longer updated.

## Optional

- [Data and sources](/en/data/): each source, its publisher, update cadence and licence status.
- [Privacy](/en/privacy/)
- [Full guide for agents](/llms-full.txt)
- [Sitemap](/sitemap.xml)