Flex API changelog Every change to the Flex API, webhooks, MCP server and developer documentation. https://flexonthejob.com/changelog 2026-09-21T00:00:00Z Flex Services, LLCdevelopers@flexonthejob.com Rate-limit headers, richer OpenAPI metadata, status page https://flexonthejob.com/changelog#2026-09-21-b 2026-09-21T00:00:00Z X-RateLimit-Limit / -Remaining / -Reset on every /api/v1 and /mcp response; OpenAPI info.contact, termsOfService, license and servers[]; GET /health; status.flexonthejob.com; /changelog and /dpa published. Public sandbox and webhooks in the spec https://flexonthejob.com/changelog#2026-09-21-a 2026-09-21T00:00:00Z sandbox.flexonthejob.com with a published read-only key; outbound webhooks published as x-webhooks in /openapi/v1.json and in llms.txt. Four change-driven webhook events https://flexonthejob.com/changelog#2026-09-20 2026-09-20T00:00:00Z invoice.sent, transfer.completed, inventory.low_stock, item.updated. Public developer, security and AI pages; robots.txt and security.txt on both hosts. MCP server and webhooks https://flexonthejob.com/changelog#2026-09-07 2026-09-07T00:00:00Z Streamable-HTTP MCP server at /mcp (16 tools, 2 resources); eight signed webhook events with retry and delivery log. API v1 initial release https://flexonthejob.com/changelog#2026-09-05 2026-09-05T00:00:00Z Customers, items, invoices, jobs, schedule, schedule groups, users, modules. Per-key permissions and rate limits, cursor paging, updatedSince, ETags, Idempotency-Key, RFC 7807 errors, /docs, /openapi/v1.json, /llms.txt.