> ## Documentation Index > Fetch the complete documentation index at: https://docs.errorbar.ai/llms.txt > Use this file to discover all available pages before exploring further. # Get a calibration certificate > Returns the signed judge certificate for a criterion — what was proven (confusion matrix, TPR/TNR/kappa with intervals, trust verdict), on which population, what voids it, and what enforcement refused involving it — for audits, evidence bundles, or proving a judge's calibration to a third party. Free (no judging). 404 if the criterion is not in the workspace. Response is Cache-Control: no-store. Hand the WHOLE JSON object to POST /v1/verify to check the signature later. An uncalibrated judge still returns a certificate that honestly says nothing is measured (calibration.measured=false, trust.trust='unmeasured'). enforcement counts refusal-ledger rows from the last 90 days whose subject is this criterion or whose reason names it. ## OpenAPI ````yaml /openapi.json get /v1/criteria/{id}/certificate openapi: 3.1.0 info: title: errorbar Management API description: >- The management API behind the improvement loop: capture and setup, request logs and datasets, grades (labels), judges (criteria), evals and deploy gates, fine-tuning and reinforcement learning, dedicated GPU endpoints, and model aliases and versions. Authenticated with a workspace API key (sk_sovereign_...). The inference API (chat, embeddings, rerank, responses) is OpenAI-compatible and documented separately. Responses are snake_case, list endpoints on the loop products use the {"object": "list", "data": [...]} envelope, and refusals use the same nested error shape the gateway emits: {"error": {"message", "type", "code"}}. Request bodies on the loop products (logs, labels, criteria, evals, datasets, aliases) are snake_case; the training and infrastructure products (fine-tuning, GRPO, environment tools, dedicated, model-version adoption) validate camelCase bodies, and each schema below says which it is. Endpoints that spend money require a key minted by a workspace owner or admin and return 403 otherwise. version: 1.0.0 servers: - url: https://gateway.errorbar.ai description: Production - url: https://www.errorbar.ai/api description: Control plane (also served at this base URL) security: - bearerAuth: [] paths: /v1/criteria/{id}/certificate: get: tags: - Criteria summary: Get a calibration certificate description: >- Returns the signed judge certificate for a criterion — what was proven (confusion matrix, TPR/TNR/kappa with intervals, trust verdict), on which population, what voids it, and what enforcement refused involving it — for audits, evidence bundles, or proving a judge's calibration to a third party. Free (no judging). 404 if the criterion is not in the workspace. Response is Cache-Control: no-store. Hand the WHOLE JSON object to POST /v1/verify to check the signature later. An uncalibrated judge still returns a certificate that honestly says nothing is measured (calibration.measured=false, trust.trust='unmeasured'). enforcement counts refusal-ledger rows from the last 90 days whose subject is this criterion or whose reason names it. operationId: getCriterionCertificate parameters: - name: id in: path required: true schema: type: string description: Identifier. responses: '200': description: >- A JSON document whose keys are camelCase (NOT snake_case — it is emitted verbatim so its signature can be re-derived): signature: {alg:'HS256', key_id, value} | null (with unsigned: true when no signing secret is configured), criterionId, name, question (the judge prompt), unit ('request'|'trace'), judgeModel, issuedAt, calibration: {measured, matrix: {tp,fp,tn,fn}|null, metrics: {n, tpr, tprCi, tnr, tnrCi, kappa}|null, labels, holdoutActive (labels >= 80), alignedAt, goldenSet: {id, name, size, membershipHash, frozenAt, humanKappa, humanAgreement, humanKappaN, raterCount}|null}, trust: {trust: 'trustworthy'|'misaligned'|'under-measured'|'borderline'|'unmeasured', failGradesNeeded, passGradesNeeded, tprCi, tnrCi} (or just {trust:'unmeasured'}), population: {tag, segment, unit, statement}, validity: {driftStatus: 'ok'|'flagged', driftReason, driftCheckedAt, voidedBy: string[]}, enforcement: {windowDays: 90, refusalsInvolvingJudge, lastReason}. content: application/json: schema: type: object '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '404': $ref: '#/components/responses/NotFound' components: responses: BadRequest: description: Malformed request or invalid field. content: application/json: schema: $ref: '#/components/schemas/Error' Unauthorized: description: Missing, malformed, or revoked API key. content: application/json: schema: $ref: '#/components/schemas/Error' example: error: message: Invalid API key type: invalid_request_error code: invalid_api_key NotFound: description: The resource does not exist in your workspace. content: application/json: schema: $ref: '#/components/schemas/Error' schemas: Error: type: object properties: error: type: object properties: message: type: string type: type: string description: >- invalid_request_error, insufficient_quota, rate_limit_error, or api_error. code: type: string description: >- Machine-stable cause, e.g. invalid_api_key, not_found, insufficient_permissions, precondition_failed. required: - message - type - code description: >- Every refusal — gateway and management API alike — uses this one envelope. securitySchemes: bearerAuth: type: http scheme: bearer description: >- Your workspace API key, e.g. `sk_sovereign_...`, sent as `Authorization: Bearer `. ````