For Developers

Treat prompts like code
without polluting your codebase

Stop scattering prompts across config files, environment variables, and source code. Get versioning, testing, and observability without the mess.

View API docsSee example code

Your pain points, solved

❌

The Old Way

  • •Prompts scattered across code and config files
  • •No safe way to test or roll back changes
  • •Limited visibility into cost, latency, failures
  • •Fragile integrations when prompts change shape

With Endprompt

  • Prompts as first-class, versioned entities
  • Strongly-typed input/output schemas
  • Automatic caching to reduce redundant LLM calls
  • Beautiful, searchable logs with replay
  • Cost and token tracking per endpoint
  • Liquid templating for dynamic prompt logic

Core developer features

Version Control

Every prompt change is versioned automatically. Roll back instantly without redeploying.

v2.3.1 → v2.3.2
git-style diffs included

Strong Contracts

Define input and output schemas. Get TypeScript types and OpenAPI specs automatically.

interface Input {
text: string;
}

Full Observability

Every request logged with prompt hash, model, tokens, cost, and latency. Replay any request.

Tokens: 1,247 → 312
Cost: $0.0234
Latency: 1.8s

Smart Caching

Configurable caching prevents redundant LLM calls for repeated inputs. Reduce costs without adding complexity.

cache_ttl: 3600
Cache hit: $0.00
67% cost savings

Liquid Templating

Advanced prompts with conditional logic, loops, and filters. More powerful than simple variable substitution.

{% if premium %}
Use advanced model
{% endif %}

Reusable Snippets

Define prompt snippets once and reference them across multiple prompts for consistency and maintainability.

{% include "tone" %}
// Shared snippet
Be professional...

Simple HTTP API

API Examples

curl -X POST \
  https://api.endprompt.ai/api/v1/summarize \
  -H "x-api-key: your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "website": "Endprompt.ai",
    "company_name": "Endprompt"
  }'

Strongly-typed response

{
  "output": {
    "company_description": "Endprompt lets teams
    design, version, and run LLM prompts behind
    stable, observable APIs—so domain experts
    define behaviour and developers integrate
    once."
  },
  "executionLogId": "00fb29bd-1fc4-49b8-8e57-d3783ec1dc95",
  "latencyMs": 1247,
  "inputTokens": 234,
  "outputTokens": 89,
  "cost": 0.0234,
  "cacheHit": false,
  "metadata": {
    "promptId": "b5415d63-4390-40ec-8c2b-33a2db2f5c67",
    "promptName": "summarize company",
    "promptVersion": 3,
    "model": "gpt-5.2"
  }
}

Integrate once, iterate forever

Your code stays clean. Domain experts can refine prompts, change models, and test variations without touching your application code.

Stop managing prompts in code

Get the observability and safety you need without the mess.

Read the docs