Ultra-Fast UK Address Autocomplete & Verification API
Query over 21.1 million property records and ordnance surveys instantly. Serve autocomplete, postcode lookups, geocoding coordinates, and UPRNs in under 15ms directly from our memory-deduplicated SQLite FTS5 index.
< 15ms
Response Latency
21.1M+
Address Directory
100%
Geocoded Coordinates
O(1) Cache
Ingestion Speed
Try Interactive Demos
Select any scenario below to see how FastAddress UK handles real-world business checkout processes, routing, and developer workflows.
🛒 E-commerce Checkout Autocomplete
Reduce cart abandonment by 20% by enabling customers to search and auto-fill checkout address fields.
Payload Output:
// Select an address to inspect API response payload
High Performance Search Engine
Engineered from the ground up for speed, reliability, and precision.
Smart Street Interpolation
Our dynamic fallback engine computes and generates address numbers on existing streets at postcode level, resolving missing property records immediately.
Geospatial Coordinates
Every suggestion returned includes precise geocoded WGS84 Latitude and Longitude coordinates, ready for maps and distance calculation.
Official OS UPRN Mapping
Expose Unique Property Reference Numbers (UPRN) for all registered addresses to map coordinates directly to Ordnance Survey maps.
Flexible Monetized Subscription Plans
Start querying for free during development and upgrade as your lookup demands scale.
BASIC
For testing and validation
- 100 free requests / month
- Overage rate: £0.20 each
- All search endpoints included
- Standard latency metrics
PRO
For production startups
- 50,000 requests / month
- Overage rate: £0.10 each
- Dedicated Edge Proxy routing
- 24/7 endpoint monitoring
MEGA
For high-traffic enterprise
- 500,000 requests / month
- Overage rate: £0.001 each
- Unlimited query throttling limits
- Priority tech developer support