# PromptLayer

**Canonical:** https://apis.io/providers/promptlayer/  
**Website:** https://www.promptlayer.com  
**APIs profiled:** 4

PromptLayer is a prompt engineering, prompt management, and LLM observability platform. Its REST API logs and tracks LLM requests, manages a versioned prompt registry with release labels, ingests OpenTelemetry-style spans and traces, and runs evaluations and datasets so teams can monitor, debug, and improve their LLM applications.

## Kin Score — 38.0 / 100 (thin)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 38.0).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 55.8 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 34.2 |
| Developer Ergonomics | 21.4 |
| Commercial Clarity | 39.5 |
| Access Clarity | 39.5 |

## Agent readiness — 19.8 (agent-aware)

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

## Access

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high).

## APIs (4)

- **PromptLayer Evaluations & Datasets API** — Create, run, and score evaluation reports against datasets.
- **PromptLayer Logging & Tracking API** — Log and track LLM requests, scores, and metadata.
- **PromptLayer Prompt Registry API** — Retrieve and publish versioned prompt templates.
- **PromptLayer Spans & Traces API** — Ingest spans and manage traces for LLM observability.

## Agentic access (1)

- **Promptlayer Agentic Access** — 16 operations · 11 acting

## Security (2)

- **Promptlayer Authentication** — apiKey · 1 scheme
- **Promptlayer Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC

## Plans (1)

- **Promptlayer Plans Pricing**

## Tags

Artificial Intelligence, LLM, Prompt Engineering, Prompt Management, Observability, Evaluation

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