# Bem Function Accuracy API

**Canonical:** https://apis.io/apis/bem/bem-function-accuracy-api/  
**Provider:** Bem — https://apis.io/providers/bem/  
**Base URL:** https://api.bem.ai  
**Documentation:** https://docs.bem.ai

Bem Function Accuracy API is one of 22 APIs that [Bem](https://apis.io/providers/bem/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Function Accuracy. The published artifact set on APIs.io includes an OpenAPI specification.

Monitor, evaluate, and iterate on the quality of every function in your environment. Function Accuracy bundles two complementary loops: ## Evaluations (`/v3/eval`) Trigger and retrieve per-transformation evaluations. Evaluations run asynchronously and score each transformation's output against the function's schema for confidence, per-field hallucination detection, and relevance. Supported for `extract`, `transform`, `analyze`, and `join` events. 1. **Trigger** — `POST /v3/eval` queues jobs for a batch of transformation IDs. 2. **Poll** — `GET /v3/eval/results` returns the current state of each requested ID, partitioned into `results`, `pending`, and `failed`. Accepts either `eventIDs` (preferred) or `transformationIDs` as a comma-separated query parameter, and always keys the response by event KSUID. Up to 100 IDs may be submitted per request. ## Metrics, review, regression (`/v3/functions/{metrics,review,regression,compare}`) Roll evaluation results and user corrections up into actionable function-level signal: - **`GET /v3/functions/metrics`** — aggregate accuracy, precision, recall, F1, and confusion-matrix counts per function. - **`POST /v3/functions/review`** — sample-size estimation, confidence-bucketed distribution, PR-AUC, and per-threshold confidence intervals (Wald or Wilson) for picking review cutoffs. - **`POST /v3/functions/regression`** — replay corrected historical inputs against a new function version, producing a labeled regression dataset. - **`POST /v3/functions/regression/corrections`** — propagate baseline corrections onto the regression dataset so it can be scored. - **`POST /v3/functions/compare`** — compute aggregate and field-level lift between any two versions, optionally scoped to the regression dataset. All five endpoints support `extract` end-to-end on both the vision and OCR paths, alongside the legacy `transform` / `analyze` / `join` types.

## Machine-readable artifacts (1)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/bem/refs/heads/main/openapi/bem-function-accuracy-api-openapi.yml

## Other Bem APIs (12)

- [Bem Buckets API](https://apis.io/apis/bem/bem-buckets-api/)
- [Bem Calls API](https://apis.io/apis/bem/bem-calls-api/)
- [Bem Collections API](https://apis.io/apis/bem/bem-collections-api/)
- [Bem Connectors API](https://apis.io/apis/bem/bem-connectors-api/)
- [Bem Entity Bulk Seed API](https://apis.io/apis/bem/bem-entity-bulk-seed-api/)
- [Bem Entity Curation API](https://apis.io/apis/bem/bem-entity-curation-api/)
- [Bem Entity Synonyms API](https://apis.io/apis/bem/bem-entity-synonyms-api/)
- [Bem Entity Type Reviewers API](https://apis.io/apis/bem/bem-entity-type-reviewers-api/)
- [Bem Entity Types API](https://apis.io/apis/bem/bem-entity-types-api/)
- [Bem Errors API](https://apis.io/apis/bem/bem-errors-api/)
- [Bem Feedback API](https://apis.io/apis/bem/bem-feedback-api/)
- [Bem File System API](https://apis.io/apis/bem/bem-file-system-api/)

## Tags

Function Accuracy

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/bem/bem-function-accuracy-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/bem/.