# Enrichment waterfall: verified work email

10,000 records. Rates from estimated match rates (independence assumed). Verification on (0.004 per found value).

**Recommended order: provider-c > provider-a > provider-b**: 78.1% usable fill, total 1748.23, 0.224 per usable record (cheapest setup that reaches the 70% usable fill target).

| Step | Provider | Lookups | Found | Usable | Step cost | Cost per extra usable | Cumulative fill |
| ---: | --- | ---: | ---: | ---: | ---: | ---: | ---: |
| 1 | provider-c | 10000 | 2500 | 2000 | 310 | 0.155 | 20.0% |
| 2 | provider-a | 8000 | 3600 | 3312 | 654.4 | 0.198 | 53.1% |
| 3 | provider-b | 4688 | 2578 | 2501 | 783.83 | 0.313 | 78.1% |

## Best setup by number of providers

| Providers | Order | Usable fill | Total cost | Per usable |
| ---: | --- | ---: | ---: | ---: |
| 1 | provider-b | 53.3% | 1672 | 0.313 |
| 2 | provider-a > provider-b | 72.7% | 1797.79 | 0.247 |
| 3 | provider-a > provider-b > provider-d | 82.1% | 2280.01 | 0.278 |
| 4 | provider-c > provider-a > provider-b > provider-d | 85.7% | 2134.01 | 0.249 |

Estimates, not guarantees. Re-test on a fresh sample before committing spend.