SMKlog Checkout API lets software prepare a payment session that a person then completes on smklog.com. It belongs to the SMKlog Quote API family at quote-api.smklog.com, published by SMKlog (SMKLOG-2022 LLC, Berkeley Heights, New Jersey), an independent US parcel shipping calculator and label seller.
Who it suits: developers and teams building shopping assistants, shipping tools or agent workflows. The agent prices a shipment and prepares checkout. A human always finishes payment on smklog.com. SMKlog's engine returns live USPS, UPS, FedEx and DHL Express rates from a US origin to the US, Canada, the UK, Germany or Australia.
What is published for it: OpenAPI, Documentation, API Reference, Getting Started, Tool Crosswalk, Authentication, OAuth Scopes, Conventions, Error Catalog, Lifecycle, Conformance, Rate Limits, Plans, Data Model, Change Log, Examples, Playground, Postman, JSON Schema, JSON-LD, Vocabulary, Spectral Rules, Status Page, SDK, CLI and APIs.json.
Kin Score: 86.1 (exemplar band). Agent Readiness: 54.2 (agent-ready band, scored 2026-10-17).
Pricing: set by the provider.
Condition: a live hosted API listed in the APIs.io catalog.
Notice: this listing is posted by the APIs.io catalog. APIs.io does not own or sell this API. You get access from the provider.
Catalog listing: https://apis.io/apis/smklog-com/smklog-com-checkout-api/ Provider: https://smklog.com/