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Documentation Index

Fetch the complete documentation index at: https://docs.strandai.com/llms.txt

Use this file to discover all available pages before exploring further.

Strand AI bills predictions in credits. The credits model is intentionally simple so you can predict cost exactly before submitting a job.

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How credits work

The platform tiles each slide into fixed 224×224-pixel patches and runs inference per patch, per marker. One credit pays for one (patch × marker) prediction.
1 credit = 1 patch × 1 marker. Patch size is fixed at 224 px today; the credit-to-patch mapping lives in platform/src/lib/credits/pricing.ts.
For a slide that’s W × H pixels: 
patches  = ceil(W / 224) × ceil(H / 224)
credits  = patches × markers_requested
That’s it. There is no separate inference fee, surcharge, or per-job overhead. A 50 000 × 40 000 px H&E with 5 markers is 224 × 179 × 5 = 200 480 credits.

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Estimating before you submit

The /predict/estimate endpoint (and its SDK wrappers) compute the exact cost from slide dimensions, with no reservation: 
est = client.predict.estimate(upload.id, markers=["CD8", "PanCK", "Ki67"])
print(est.patch_count, est.marker_count, est.estimated_credits)
print("balance:", est.org_balance, "pending:", est.org_pending)

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Reservation and refunds

When you call POST /predict, the platform atomically reserves the estimated credits against your org balance. The reservation is recorded on the job (reservedCredits) so:
  • In-flight jobs are price-locked. If we change CREDITS_PER_PATCH_MARKER or PATCH_PX later, jobs already submitted keep their reserved price.
  • Failed jobs refund automatically. If a job terminates with status failed, the reservation is released back to the org balance.
  • Insufficient balance returns 402. The error body carries the required field so you know how much to top up.

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Buying credits

Credits are sold in prepaid tiers. Today, top-ups are handled by the team. Email support@strandai.com with the volume you need and we’ll provision them.
Self-serve top-up via Stripe is in progress and will be surfaced under Settings → Billing when it ships.

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See also