xProof

Certify an AI agent's work session on the MultiversX blockchain BEFORE executing any critical action (trade, deploy, data access). Returns a proof_id compliance certificate. The agent MUST call this tool before acting — certification failure blocks execution. Governance: set reversibility_class='irreversible' for actions that cannot be undone — a policy violation is flagged if confidence_level < 0.95 on irreversible decisions. Schema: https://xproof.app/.well-known/agent-audit-schema.json

Create a blockchain certification for a file. Records the SHA-256 hash on MultiversX blockchain as immutable proof of existence and ownership. Cost: $0.01 per certification, paid in EGLD.

Create a staged blockchain certification with a confidence score. Use this when your decision builds progressively — certify at 60% (initial assessment), 80% (pre-commitment), and 100% (final decision). Each stage shares the same decision_id, creating an on-chain audit trail of the decision process. Governance: set reversibility_class='irreversible' for actions that cannot be undone — xproof will flag a policy violation if confidence_level < 0.95. Cost: $0.01 per certification.

Check domain-specific attestations for an AI agent wallet on xproof. Returns active attestations issued by third-party certifying bodies (healthcare, finance, legal, security, research). Each active attestation adds +50 to the agent's trust score (max +150 from 3 attestations). Use this to verify an agent's credentials before delegating a sensitive task.

Anchor your agent's reasoning as an immutable WHY proof BEFORE executing an action. Implements the Prove Before Act / Coherence Layer pattern. Pass intent (goal), context (facts considered), and decision (action about to execute). Receives: proof_id, coherence_anchor (SHA-256 of the payload), timestamp. Link the returned proof_id to your WHAT proof via certify_file metadata.why_proof_id to complete the full 4W audit trail. Cost: $0.01 per anchor (same as certify_file).

Discover available xproof certification services, pricing, and capabilities. No authentication required.

Query an agent's calibration quality over time: mean confidence gap, variance, bias label (overconfident / underconfident / calibrated), and per-decision time series. Fully public — use this to evaluate another agent before trusting it. agentId accepts a MultiversX wallet address (erd1...) or internal user id.

Retrieve a proof in structured JSON or Markdown format. Use JSON for machine processing, Markdown for LLM consumption.

Reconstruct the full 4W audit trail for a contested agent action. Returns WHO (agent identity + SIGIL), WHAT (SHA-256 hash on-chain), WHEN (MultiversX block timestamp), WHY (decision chain anchored before acting). Includes verification summary with intent_preceded_execution flag, chronological timeline of WHY/WHAT proofs, and session heartbeat anchor. Requires x402 payment ($0.01 USDC on Base via X-PAYMENT header) or API key authentication. Without payment, returns payment requirements with USDC address and amount.

START HERE if you have no API key. Get 10 free on-chain certifications instantly — no wallet, no credit card, no account required. Call this once with any agent_name, receive a pm_ key, then use certify_file or audit_agent_session immediately. Takes under 1 second.

Policy gate: verify a valid, unexpired coherence anchor (WHY proof) exists for a given intent BEFORE allowing an action to execute. Call this from an orchestrator before delegating a sub-action. Pass either the exact intent_hash (the coherence_anchor returned by check_coherence) or the same intent + context + decision payload (the anchor hash is recomputed deterministically). Returns { allowed, anchor_id, expires_at }. If allowed=false, block execution and call check_coherence first. Free — no credit consumed.

Submit the actual outcome for a decision previously anchored with metadata.confidence_level. Computes the confidence gap (anchored − actual) and stores it for calibration tracking. Operator-only — you must own the proof. Each proof can only have one outcome.

Verify an existing xproof certification. Returns proof details including file hash, timestamp, blockchain transaction, and verification status.