Builder ServiceResources
Changelog
Version history and notable changes to the Builder Service.
Alpha Version
The Ostium Builder Service is in Alpha. API endpoints, specifications, and builder URLs may change without notice. Use with caution in production environments.
Changelog
Track all notable changes, new features, and breaking changes to the Ostium Builder Service.
The changelog is also available via API:
# Markdown format (default)
curl https://builder.ostiscan.xyz/v1/changelog
# JSON format
curl https://builder.ostiscan.xyz/v1/changelog?format=json[1.1.0] - 2026-02-14
Changed
- Slippage removed for Limit and Stop orders — Following a protocol-level change, the
sp(slippage) parameter is now ignored forlimitandstoporder types. Slippage is hardcoded to0for these orders since they execute at predetermined prices. Market orders continue to use slippage as before (default0.25%).
Migration Notes
- If you are passing
spwhen openinglimitorstoporders, the value will be silently ignored (no breaking change). - No client-side changes are required — the service handles this automatically.
[1.0.0] - 2026-02-05
Added
- Initial release of the Builder Service.
- Exchange endpoints: Open, close, cancel, modify, and margin management.
- WebSocket support: Real-time trade actions and market data streaming.
- Delegated trading: Gasless transactions via Pimlico smart account sponsorship.
- Auth system: API key creation, verification, cancellation, and revocation.
- Rate limiting: Configurable per-IP rate limiting (default 100 req/min).
- Builder fees: Optional fee-sharing for third-party integrators.