Trust Your Data with PureStamp by STELR AI

Secure your AI and human content with cryptographic provenance. PureStamp issues and verifies invisible stamps to ensure only trusted data powers your RAG and pipelines.

Try Demo API Quickstart

Integrates with AWS S3, API Gateway, Pinecone, Weaviate, and more.

Live Preview

Issue invisible stamps to your files; verify inbound content before it reaches your vector DB.

Trusted by Industry Leaders

Why Choose PureStamp

Built for a world of AI and human content, ensuring trust at every step.

Issue at Source

Add cryptographic stamps to your content, marking authorship (Human, AI, or Unknown) for downstream trust.

Verify on Ingestion

Gate untrusted content before it enters your RAG, S3 pipelines, or vector DBs with automated verification.

Auditable Provenance

Track every file with receipts storing who, when, and what, accessible via API for audits and dashboards.

How PureStamp Works

Seamlessly integrate trust into your data pipelines in three steps.

1
Issue Stamps: Upload files or text to /purestamp/issue. Receive watermarked content with a cryptographic receipt.
2
Verify Content: Check incoming files via /purestamp/verify to confirm trust and authorship before processing.
3
Automate Trust: Integrate with S3 events, Lambda, or RAG workflows to enforce provenance at scale.

Built on AWS with API Gateway, Lambda, KMS, and optional Marketplace metering.

Quickstart (cURL)

BASE=https://qer7w7y40c.execute-api.us-east-1.amazonaws.com/prod
KEY=<your-api-key>

# Get upload URL
curl -X POST "$BASE/upload-url" \
  -H "x-api-key: $KEY" -H "Content-Type: application/json" \
  -d '{"filename":"doc.pdf","contentType":"application/pdf"}'

# Issue stamp
curl -X POST "$BASE/purestamp/issue" \
  -H "x-api-key: $KEY" -H "Content-Type: application/json" \
  -d '{"s3_uri":"s3://bucket/key","mime_type":"application/pdf","who":"Human","model":"None"}'

# Verify content
curl -X POST "$BASE/purestamp/verify" \
  -H "x-api-key: $KEY" -H "Content-Type: application/json" \
  -d '{"s3_uri":"s3://bucket/key","mime_type":"application/pdf"}'

Full API Documentation

Simple, Transparent Pricing

Start for free, scale with confidence. Aligned with your API usage needs.

Free

Perfect for developers and small projects

$0 /month

1,000 requests/month
Community support
Basic analytics

Start Free

Pro

For production-grade applications

$49 /month + usage

100,000 requests/month
Overage at $0.001/request
Priority email support
Advanced analytics

Get Pro

Enterprise

Custom solutions for large-scale needs

Custom

Unlimited requests
SOC 2 compliance
Dedicated support
Custom integrations

Contact Sales

Frequently Asked Questions

Everything you need to know about PureStamp.

What file types are supported?

PDF, DOCX, TXT, JSON, PNG, and JPEG. More formats coming soon.

Does it support AI-generated content?

Yes, you can mark content as Human, AI (specifying the model), or Unknown. Verification returns authorship details.

How is PureStamp deployed?

Serverless on AWS with API Gateway, Lambda, S3, and KMS. Optional AWS Marketplace metering available.

How secure is the watermarking?

PureStamp uses AWS KMS for cryptographic HMAC signatures, ensuring tamper-proof provenance. Text uses invisible zero-width characters; files use S3 metadata.