A shipping API comparison should weigh billing, metered calls, carriers, and carrier accounts. EasyPost and Shippo add per-label fees past a free allowance and ShipStation API sells label-count plans; GoatLabels charges $0 Free or $40 Pro flat, with unlimited calls and USPS, UPS, FedEx, and DHL from one prepaid wallet.
USPS, UPS, FedEx, and DHL quoted in a single request from US and Singapore origins, with no carrier accounts to bring.
all quotedFund with card, Apple Pay, Google Pay, or ACH. The API and the dashboard spend the same balance.
Updated . Competitor figures checked 2026-09-26.
A shipping API comparison should cover six things: how labels are billed, whether non-purchase calls are metered, which carriers you get, whether you must bring carrier accounts, what the enterprise tier includes, and how safely the API handles retries. Feature lists look alike across vendors; these six are where the bill and the on-call pager differ.
Is the label fee per label, a monthly plan sized by label count, or a flat plan? Model your worst month, not your average one.
Does rating, tracking, or address validation cost money per call? A cart that re-quotes on every address edit multiplies that meter.
Count the carriers you actually use. Four carriers rate-shopped cover most US parcel lanes; a regional carrier outside them decides the question alone.
If you have negotiated UPS or FedEx rates you must keep, you need an API that accepts your own accounts. If you do not, provided rates remove an onboarding step.
A timeout on label purchase must not buy a second label. Check for an idempotency key, and check how webhooks are signed and replayed.
Operations still handles exceptions. Check whether a dashboard, CSV import, and store connectors spend the same balance as the API.
They differ most on billing: EasyPost and Shippo add a per-label fee after a free allowance, ShipStation API (formerly ShipEngine) sells plans sized by label count, and GoatLabels charges a flat plan with unlimited calls. The others win on carrier breadth and on accepting your own carrier accounts.
| GoatLabels | EasyPost | Shippo | ShipStation API | |
|---|---|---|---|---|
| How labels are billed | Free plan: $0 a month with 50 shipments a month. Pro: $40 a month flat, unlimited shipments, cheaper label rates. Every label debits a prepaid wallet at the quoted amount. | Wallet carriers free for the first 3,000 labels a month, then $0.08 per label (in effect since 2026-02-23). Postage is separate. | API Starter: 30 labels a month free, then 7 cents per label. API Premier is custom-priced. | Free plan with essential API access. Advanced from $75 a month for 1,000 labels, $325 for 5,000, $600 for 10,000, with per-label overage. |
| Calls other than label purchase | Unlimited API calls on every plan. Rating, re-quoting, and tracking reads are not metered. | Check the pricing page for any add-on services you plan to call. | Starter meters rating at 1 cent per rate generation, tracking at 2 cents per track, and US address validation at 2 cents. | Advanced includes rate comparison, address validation, and tracking with no separate per-transaction fee. |
| Carriers | USPS, UPS, FedEx, and DHL rate-shopped on every parcel from one account, from US and Singapore origins, plus an international network. | 100+ carrier integrations. | 40+ carriers for labels, 1,000+ for tracking. | 100+ carriers supported. |
| Bring your own carrier accounts | No. Rates come from GoatLabels' accounts, so there is no rate card to negotiate and nothing to provision before the first quote. | Yes, on the BYOCA plan: $20 a month plus per-label charges. | Not listed on the API pricing page; check Shippo's carrier account documentation. | Yes, on Advanced and Enterprise. |
| Enterprise tier | None. No SLA, no SSO, no sub-accounts, no negotiated contracts, no dedicated account manager. Support is email plus the in-app assistant. | Custom enterprise pricing. | API Premier: custom pricing, a dedicated account manager, and solutions engineering support. | Enterprise: custom pricing for 25,000+ shipments a month. All tiers list 24/7 email support. |
| Developer tooling | Live and test keys (test keys work in CI), an Idempotency-Key header on purchase, signed replayable webhooks, OpenAPI 3.1 at /api/v1/openapi.json, rate-limit headers. No official SDKs. | Not compared here. Check test mode, webhook signing, client libraries, and retry semantics in EasyPost's API reference. | Not compared here. Check test mode, webhook signing, client libraries, and retry semantics in Shippo's API reference. | Not compared here. Check sandbox, webhook signing, client libraries, and retry semantics in the ShipStation API reference. |
Sources, checked 2026-09-26:EasyPost pricing; 1TeamSoftware, EasyPost 2026 pricing change (2026-02-09); Shippo API pricing; ShipStation API pricing (formerly ShipEngine). Vendors change plans and fees; their pricing pages are the source of truth.
Want the table filled in with your own volume and lanes?
Create a free accountA high-volume or B2B team usually fits whichever API keeps the per-label cost flat as volume grows while still covering its carriers. At a few thousand labels a month, a per-label platform fee is small; at tens of thousands it becomes a line item finance asks about. GoatLabels Pro is $40 a month flat with unlimited shipments and unlimited calls, and every label lands on a dated ledger entry carrying your reference, so cost per client or per channel is an export you filter.
The same wallet backs the dashboard, bulk CSV import (up to 500 rows, with errors named by row and field), and 13 store connectors. That matters when operations has to ship orders your integration never saw. For 3PL and warehouse teams the fuller picture is on shipping software for 3PLs and high-volume labels without a subscription.
Another shipping API is the better choice when you need carriers, account types, or enterprise terms that GoatLabels does not offer. Say so early and save both sides a trial:
Create the shipment, compare USPS, UPS, FedEx, and DHL rates, and buy the label with one Bearer header. Send an Idempotency-Key and a retried purchase returns the original label. The dashboard and the API buy from the same prepaid balance.
POST /api/v1/shipments
Authorization: Bearer sk_live_…
Idempotency-Key: ord_8421
{
"to": { "name": "Joyce", "city": "Berlin", "country": "DE" },
"parcel": { "weight": 2.6, "weight_unit": "lb" },
"service": "fedex_intl_priority"
}
Free is $0 a month with 50 shipments a month. Pro is $40 a month flat with unlimited shipments and cheaper label rates. API calls are unlimited on both, and every label debits the prepaid wallet at the quoted amount.
Volume pricing
illustrativeone flat plan, unlimited shipments
$0 / forever
Everything you need to run your shop, genuinely free.
Billy AI lives in the web app on every plan, desktop or mobile, unlimited use. Pro adds Billy on Telegram.
GET /api/v1/shipments
200 OK · plan: free
Free API access on Free, still free on Pro.
Put last month's parcels through the test keys and compare the all-in label cost against what those labels cost you on
ShippoPirate ShipShipStationLabel prices are quoted live from USPS, UPS, FedEx, and DHL and shown as one number, the same number that leaves your wallet. Other vendors' plans and fees move, so compare against their current pricing page. Full pricing details
Related reading:the shipping API for developers, EasyPost vs a free shipping API, a Shippo alternative for API developers, the ShipEngine alternative, shipping software for 3PLs.
Put last month's shipments through the test keys and compare the all-in label cost against your current API bill, fees included.
No card required. No contract.