A privacy-oriented context API. Store encrypted facts, prove properties without revealing them, and share verifiable answers between agents — through a single endpoint.
The cryptographic and operational primitives behind a trustworthy AI system: encryption at rest, signed proof envelopes, tenant-scoped search, audit logs, and an end-to-end-encrypted path where the operator never sees plaintext.
Prove a property of a private fact (yes / no) with an HMAC-signed envelope. Verifiable by anyone holding the verifier secret, without ever exposing the underlying value.
AES-GCM at rest, pgvector with the IVFFlat index, and tenant-scoped queries. Server-sealed facts are searchable; client-sealed facts stay opaque to the server.
Run small allow-listed actions inside an isolated VM sandbox with signed attestation metadata. Designed to swap in a real TEE provider without changing the client contract.
Share context across tools, sessions, and agent swarms without surfacing raw values to downstream systems. Single-use share tokens are bound to a recipient and expiry.
Hashed API keys, deny-all RLS, audit logs, request-id propagation, sliding-window rate limits, and instant key revocation. The technical hooks compliance regimes ask for.
store, prove, share, search, verify_proof, and sandbox — all through a single POST. OpenAPI 3.1 spec is checked into the repo.
Freemium + usage-based overages. Included ops reset monthly; beyond that, metered billing typically lands between $0.005–$0.02 per operation (volume discounts on Stripe).
Enterprise
Custom
Unlimited + SLA
Unlimited ops (contract) · SLA · Dedicated sandbox / custom integrations · SOC 2 alignment support
ContactStore encrypted facts, generate proofs, share with other agents, run semantic search, verify proof envelopes, and execute in an isolated sandbox. All through a single API.
curl -X POST https://zkshare.io/api/v1/context \
-H "x-api-key: your_api_key" \
-H "Content-Type: application/json" \
-d '{
"operation": "prove",
"user_id": "user_123",
"fact_key": "vacation_preference",
"query": "does the user prefer beach vacations?"
}'{
"success": true,
"operation": "prove",
"data": { "answer": "yes", "commitment": "0x7f3a9c..." },
"proof": "base64url-proof-payload...",
"verified": true,
"timestamp": "2026-04-28T12:00:00Z",
"usage": { "calls": 42, "limit": 1000 }
}storeEncrypt and embed facts
proveSigned yes / no envelopes
shareTime-bound share tokens
searchSemantic vector search
verify_proofValidate without plaintext
sandboxIsolated execution
Get your API key and ship privacy-preserving features in minutes. Free tier includes 1,000 operations per month.