# Cleveland-Cliffs > Cleveland-Cliffs Inc. (NYSE: CLF) is North America's largest flat-rolled steel producer and the > largest supplier of steel to the automotive industry, operating an integrated business from iron > ore mining and pelletizing through steelmaking, finishing, tooling and stamping. Cleveland-Cliffs > publishes no developer portal, no public API and no OpenAPI/AsyncAPI/GraphQL contract. Its > documented machine-to-machine surface is batch EDI - ANSI ASC X12 version 4010 over SFTP or an > IBM Sterling VAN - with 23 implementation guidelines published publicly as PDFs. Its transactional > portals (Outside Processors, iSupplier, Customer Service Center, Vendor Inquiry) are login-gated. > This file was generated by API Evangelist from a third-party profile; Cleveland-Cliffs does not > serve an llms.txt of its own (probed 2026-09-05, HTTP 404). ## Integration surface - [EDI specifications for outside processors](https://www.clevelandcliffs.com/doing-business/for-outside-processors): ANSI ASC X12 v4010 for Burns Harbor, Cleveland, Indiana Harbor and Kote. SFTP preferred, VAN via IBM Sterling Supply Chain Business Network Hub. 18 inbound and 5 outbound transaction guidelines plus a testing template. - [Supplier information](https://www.clevelandcliffs.com/doing-business/for-suppliers): iSupplier portal, vendor inquiry, invoice submission routes, supplier quality manual and purchase order terms. - [Customer information](https://www.clevelandcliffs.com/doing-business/for-customers): price book, monthly surcharge tables, claims policies and terms and conditions of sale. - [Product compliance and certification](https://www.clevelandcliffs.com/doing-business/product-compliance): IATF 16949, ISO 9001, ISO/IEC 17025 (A2LA), PED and ABS certificates as dated PDFs. ## Gated applications (sign-in required, no public contract) - [Outside Processors Portal](https://op.cliffssteel.com) - [iSupplier Portal](https://isupplier.cliffssteel.com) - [Customer Service Center - mill test certificates](https://cert.cliffssteel.com) - [Vendor Inquiry - accounts payable and invoice status](https://www.clevelandcliffs.us/vendor_inquiry/) - [FPT supplier portal](https://portal.fptscrap.com/) (Ferrous Processing and Trading, a Cleveland-Cliffs subsidiary) ## Machine-readable documents Cleveland-Cliffs actually serves - [OpenID Connect discovery](https://login.clevelandcliffs.com/.well-known/openid-configuration): the company's Okta tenant on its own vanity domain, issuer https://login.clevelandcliffs.com. - [OAuth 2.0 authorization server metadata (RFC 8414)](https://login.clevelandcliffs.com/.well-known/oauth-authorization-server) - [security.txt](https://www.clevelandcliffs.com/security.txt) - served at the document root, not /.well-known/, and expired. - [News releases RSS](https://www.clevelandcliffs.com/news/news-releases/rss) ## API Evangelist profile artifacts - [apis.yml](https://raw.githubusercontent.com/api-evangelist/cleveland-cliffs/refs/heads/main/apis.yml): the APIs.json index for this profile. - [Integration conventions](https://raw.githubusercontent.com/api-evangelist/cleveland-cliffs/refs/heads/main/conventions/cleveland-cliffs-conventions.yml): the full X12 transaction catalog, transport, idempotency and reversibility findings. - [Conformance](https://raw.githubusercontent.com/api-evangelist/cleveland-cliffs/refs/heads/main/conformance/cleveland-cliffs-conformance.yml) - [Authentication](https://raw.githubusercontent.com/api-evangelist/cleveland-cliffs/refs/heads/main/authentication/cleveland-cliffs-authentication.yml) - [OAuth scopes](https://raw.githubusercontent.com/api-evangelist/cleveland-cliffs/refs/heads/main/scopes/cleveland-cliffs-scopes.yml) - [Well-known probe](https://raw.githubusercontent.com/api-evangelist/cleveland-cliffs/refs/heads/main/well-known/cleveland-cliffs-well-known.yml) - [Domain security](https://raw.githubusercontent.com/api-evangelist/cleveland-cliffs/refs/heads/main/security/cleveland-cliffs-domain-security.yml) - [Vulnerability disclosure](https://raw.githubusercontent.com/api-evangelist/cleveland-cliffs/refs/heads/main/security/cleveland-cliffs-vulnerability-disclosure.yml) - [Sandbox and test path](https://raw.githubusercontent.com/api-evangelist/cleveland-cliffs/refs/heads/main/sandbox/cleveland-cliffs-sandbox.yml) - [Lifecycle](https://raw.githubusercontent.com/api-evangelist/cleveland-cliffs/refs/heads/main/lifecycle/cleveland-cliffs-lifecycle.yml) - [Plans and pricing](https://raw.githubusercontent.com/api-evangelist/cleveland-cliffs/refs/heads/main/plans/cleveland-cliffs-plans-pricing.yml) - [Rate limits](https://raw.githubusercontent.com/api-evangelist/cleveland-cliffs/refs/heads/main/rate-limits/cleveland-cliffs-rate-limits.yml) - [Packages](https://raw.githubusercontent.com/api-evangelist/cleveland-cliffs/refs/heads/main/packages/cleveland-cliffs-packages.yml) ## Corporate - [Cleveland-Cliffs](https://www.clevelandcliffs.com) - [Investor relations](https://www.clevelandcliffs.com/investors) - [Newsroom](https://www.clevelandcliffs.com/news) - [Sustainability](https://www.clevelandcliffs.com/sustainability) - [Contact](https://www.clevelandcliffs.com/contact) - [Privacy policy](https://www.clevelandcliffs.com/privacy-policy) - [Disclaimer / terms of use](https://www.clevelandcliffs.com/disclaimer) ## Not available - No OpenAPI, Swagger, AsyncAPI, GraphQL, gRPC/Protobuf or WSDL contract (probed nine hosts, 2026-09-05). - No MCP server, A2A agent card, agent skills or llms.txt published by the company. - No SDKs, CLI, Postman collection, changelog, status page, roadmap or public developer portal.