Question 1

What is Xache?

Accepted Answer

Xache is agent cognition infrastructure for AI agents. It provides ephemeral context (session-scoped working memory with 6 named slots), verifiable long-term memory with on-chain blockchain receipts, a privacy-preserving knowledge graph, LLM-powered memory extraction, a collective intelligence marketplace, and portable reputation — all with pay-per-operation pricing and no subscriptions.

Question 2

How does Xache's ephemeral context work?

Accepted Answer

Ephemeral context provides session-scoped working memory with 6 named slots: conversation, facts, tasks, cache, scratch, and handoff. Sessions auto-expire (default 1-hour TTL), support up to 5 renewals, and can be promoted to persistent long-term memory in one call. Session create/renew costs $0.005, slot read/write is free, and promotion costs $0.05.

Question 3

How does Xache verify memories on-chain?

Accepted Answer

Every memory operation generates a cryptographic receipt. Receipts are batched into Merkle trees hourly and anchored to both Base (EVM) and Solana blockchains daily (included free). Opt-in immediate anchoring with 5-minute batching is available at +$0.005 per receipt. Merkle proofs are verifiable on-chain forever.

Question 4

What is Xache's Cognition (memory probe)?

Accepted Answer

Cognition is zero-knowledge semantic search. Agents generate cognitive fingerprints client-side (SHA-256 topic hashes + PCA-compressed 64-dimensional embeddings) and the server matches them without decrypting content — using cosine similarity on compressed embeddings and topic hash intersection. Memory probe is free and rate-limited to 10 requests per minute per DID.

Question 5

How much does Xache cost?

Accepted Answer

Xache uses pay-per-operation pricing via the x402 micropayment protocol (USDC). Memory store: $0.0021 ($0.0009/item batch), retrieve: $0.0031 ($0.0016/item batch), extraction: $0.002 (BYO-LLM) or $0.011 (managed). Memory probe is free. No subscriptions, no minimums. 10,000 memories (store + retrieve) costs $25 total.

Question 6

What SDKs and integrations does Xache support?

Accepted Answer

Xache provides TypeScript SDK (@xache/sdk on npm), Python SDK (xache on PyPI), MCP Server for Claude Desktop and Cursor, LangChain integrations (TypeScript and Python), CrewAI, AutoGen, and OpenClaw integrations. All include ephemeral context tools and signer abstraction for external wallet support.

Question 7

What is ERC-8004 portable reputation?

Accepted Answer

ERC-8004 is Xache's on-chain reputation standard deployed on Base mainnet. It provides reputation scores (0-100) across 7 dimensions: memory quality, contribution success, economic value, network influence, reliability, specialization, and weighted overall. Reputation is exportable via EIP-712 signing, making it portable across platforms.

Question 8

How does Xache protect privacy?

Accepted Answer

Xache uses client-side encryption (XSalsa20-Poly1305) — the server never sees plaintext data. The knowledge graph uses HMAC-SHA512/256 derived keys so the server only sees encrypted identifiers. Multi-tenant isolation uses HMAC-derived subject keys with zero PII exposure. GDPR-ready deletion supports soft-delete, hard delete with cryptographic key destruction, and on-chain deletion receipts for compliance.