These docs describe the reference manufacturing API at sinter.systems. A sinter.ac subscription covers the project-planning workspace; manufacturing API access is separate.

Quickstart

1. Get an API key

Dashboard → API keys → Create. The key is shown once.
A device login: the agent starts it, the user approves a code at https://sinter.systems/device, the agent receives the key.

Keep the key in the environment

export SINTER_API_KEY=sk_sinter_...
export BASE=https://sinter.systems
export AUTH="Authorization: Bearer $SINTER_API_KEY"

curl -sS "$BASE/v1/me" -H "$AUTH"

2. Upload a model

curl -sS -X POST "$BASE/v1/quotes" -H "$AUTH" \
  -H "Idempotency-Key: bracket-v3-x10" \
  -F [email protected] -F material=PETG -F quantity=10

202: status received, or quoted at once

{
  "object": "quote",
  "id": "ord_...",
  "status": "received",
  "progress": { "stage": "queued", "fraction": 0, "ahead": 0 },
  ...
}

Field	Value
`file`	STEP, STL, OBJ or 3MF, up to 50 MB. Required.
`material`	PLA+, PLA-CF, PETG, PETG-CF, ASA, ASA-CF, PC, PC-CF, TPU, TPU-CF, Nylon, Nylon-CF, PPA-CF, PPS-CF or Custom. Default PLA+.
`material_note`	Custom only: the material wanted. Required for Custom.
`quantity`	1 to 100. Default 1.
`units`	mm, cm or in. STL and OBJ only. Default mm.

3. Wait for the quote

Until status is quoted, needs_review, engineering or failed, poll every 5 to 10 seconds.

curl -sS "$BASE/v1/quotes/ord_..." -H "$AUTH"

200

{
  "object": "quote",
  "id": "ord_...",
  "status": "quoted",
  "flags": [],
  "options": [
    { "speed": "asap", "label": "Default", "days": null,
      "ship_by": 1791701999, "total_cents": 18450, "unit_cents": 1845,
      "currency": "USD", "available": true, "note": null },
    { "speed": "week", "label": "Economy", "days": null, "asap_offset_days": 7,
      "ship_by": 1792306799, "total_cents": 14760, "unit_cents": 1476,
      "currency": "USD", "available": true, "note": null }
  ],
  "review_url": "https://sinter.systems/q/...",
  ...
}

Read flags before proceeding: manufacturability findings can include warnings on a quoted part. Also check statuses and errors.

4. Price delivery

Every order needs a delivery price before it can be paid.

curl -sS -X POST "$BASE/v1/quotes/ord_.../delivery" -H "$AUTH" \
  -H "Content-Type: application/json" \
  -d '{"name": "Jane Doe", "phone": "4155550100", "street": "1 Market St",
       "city": "San Francisco", "state": "CA", "zip": "94105"}'

Response	Meaning
200	The quote, with `delivery`: `method`, `city`, `fee_cents`.
422	`carrier_shipping_available`: outside the courier area. Ask the user; if they choose carrier shipping, send the address again with `"accept_carrier": true`. Other codes: Delivery codes.

5. Accept

A purchase. Needs a key with the purchase scope, which the account owner grants by turning on Allow purchases, and the user’s approval of this purchase: price, quantity, material and ship date. See Rules for agents.

curl -sS -X POST "$BASE/v1/quotes/ord_.../accept" -H "$AUTH" \
  -H "Idempotency-Key: accept-ord_...-week" \
  -H "Content-Type: application/json" \
  -d '{"speed": "week"}'

Response	Meaning
402	`payment_required`. Every order is paid by card first. Give `checkout_url` to the user. Poll the quote every 30 s or slower until `status` is `accepted`.
200	Already paid: the order.
403	No `purchase` scope.
409	Expired, held for review, the option is no longer available, or delivery not priced. `ship_date_changed`: show the user the new `ship_by`; accept again only if they agree.
428	No `Idempotency-Key`.

6. Track

The order id is the quote id.

curl -sS "$BASE/v1/orders/ord_..." -H "$AUTH"

200

{
  "object": "order",
  "id": "ord_...",
  "status": "in_production",
  "ship_by": 1792306799,
  "parts": [ { "unit": 1, "status": "printing", "progress": 0.42 }, ... ],
  "tracking": null,
  ...
}