Contact

support@prop-line.com

Support questions, sales and Enterprise enquiries, billing problems, data-accuracy reports and security disclosures all go to this address. It is a replyable human inbox, not a no-reply alias. Typical response is within one business day.

Bug reports are genuinely useful — several customer reports have turned into same-day fixes. If a price, a graded result or a book looks wrong, send the sport, the event id, the book and roughly when you saw it, and it can be reproduced against the archive.

• Get an API key: sign up free on the home page — 1,000 requests/day, no credit card. The key is emailed to the address you verify.
• Lost your key: sign up again with the same email and it is re-sent, or rotate it from the dashboard.
• Billing and cancellation: self-service through the Stripe customer portal, linked from the dashboard.
• Is the API up? Status (monitored externally) and freshness (per-book staleness, live, no key needed).
• How do I call it? Docs, recipes, or developer resources for SDKs, the OpenAPI spec and the MCP server.

Report suspected vulnerabilities to support@prop-line.com with enough detail to reproduce. Please do not run automated scanning or load testing against the production API; ask first and it can be arranged against a key sized for it. Reports are acknowledged and, where they are real, fixed and confirmed back to you.

PropLine is an independent product operated from the United States. Correspondence is by email; there is no phone line or walk-in office, which keeps one person answering questions instead of routing them.

See about for who runs it and how the data is produced.