# Sapien

**Canonical:** https://apis.io/providers/sapien/  
**Website:** https://www.sapien.io  
**APIs profiled:** 5

Sapien is the company behind Proof of Quality (PoQ), an open protocol and consensus/attestation system for verifiable quality signals on AI data and subjective expert outputs. A panel of independent, collateral-backed validators reviews each item against a customer-defined rubric (a poq.toml spec), consensus collapses their scores into one rating per datapoint, and the result is sealed as a permanent onchain attestation (a PoQ Report) — while the underlying data never leaves the customer's systems. Use cases span training-data labeling, fine-tuning and evaluation gates, audit/compliance review, and production safety verification. Sapien ships a live Developer API (/developer/v1) and an MCP server, both authenticated with poq_live_ API keys, and runs on Base Mainnet with a $SAPIEN staking/slashing token. Backed by General Catalyst.

## Kin Score — 40.0 / 100 (developing)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.0 from 40.0).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 50.2 |
| Governance | 16.7 |
| Contract Governance | 16.7 |
| Operational Transparency | 7.9 |
| Developer Ergonomics | 47.0 |
| Commercial Clarity | 34.2 |
| Access Clarity | 34.2 |

## Agent readiness — 44.7 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | verified |
| Auth Clarity | yes |
| Idempotency | documented |
| Error Semantics | documented |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | derived |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## APIs (5)

- **Sapien Datapoints API** — The Datapoints API from Sapien — 1 operation(s) for datapoints.
- **Sapien Projects API** — The Projects API from Sapien — 2 operation(s) for projects.
- **Sapien System API** — The System API from Sapien — 1 operation(s) for system.
- **Sapien Upload Sessions API** — The Upload Sessions API from Sapien — 6 operation(s) for upload sessions.
- **Sapien Validators API** — The Validators API from Sapien — 9 operation(s) for validators.

## MCP servers (1)

- **Sapien MCP Server**

## Agentic access (1)

- **Sapien Agentic Access** — 22 operations · 12 acting · 1 human-in-the-loop

## Security (2)

- **Sapien Authentication** — http · 1 scheme
- **Sapien Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC

## Tags

Company, Artificial Intelligence, Data Quality, Data Labeling, Machine-Learning, Human-in-the-Loop, Attestation, Blockchain, Consensus, MCP

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/sapien/). Scores are computed from the provider's own public artifacts under a published rubric.