DropClaw Store

Store and retrieve encrypted files permanently on Monad blockchain via DropClaw x402 gateway

DropClaw Store — Permanent Encrypted File Storage

Store any file permanently on-chain using AES-256-GCM client-side encryption and the x402 payment protocol. Zero-knowledge: the server never sees your encryption key.

Quick Reference

• API Base: https://dropclaw.cloud
• Protocol: x402 (HTTP 402 payment flow)
• Storage chain: Monad (chainId 143)
• Payment: MON, SOL, or Base USDC
• Cost: ~$30 USD + gas to store. Free to retrieve.

How to Store a File

1. Read the file into a buffer
2. Compute SHA-256 hash of the original
3. Compress with zlib deflate
4. Generate random 32-byte AES key + 12-byte IV
5. Encrypt with AES-256-GCM → output: [IV:12][AuthTag:16][Ciphertext]
6. POST /vault/store with the encrypted blob as multipart form data (field: file)
7. You will get a 402 response with payment options — pick a chain and send payment
8. Retry the POST with header X-PAYMENT: base64(JSON({ network, txHash }))
9. CRITICAL: Save BOTH the returned skill file AND your encryption key locally

How to Retrieve a File

1. POST /vault/retrieve/{fileId} with the skill file JSON in the body
2. Receive encrypted blob
3. Extract IV (first 12 bytes), AuthTag (next 16 bytes), then ciphertext
4. Decrypt with AES-256-GCM using your saved key
5. Decompress with zlib inflate
6. Verify SHA-256 matches

Endpoints

Method	Path	Auth	Description
POST	/vault/store	x402	Store encrypted file
POST	/vault/retrieve/{fileId}	none	Retrieve encrypted file
GET	/vault/pricing?size={bytes}	none	Get pricing for file size
GET	/.well-known/x402	none	x402 discovery manifest
GET	/dropclaw-skill.json	none	Full skill spec (JSON)
GET	/claude-tools.json	none	Claude tool definitions
GET	/openai-tools.json	none	OpenAI tool definitions

MCP Server

For Claude Desktop / Claude Code integration:

claude mcp add dropclaw -- node /path/to/mcp/index.js

Install SDK: npm i dropclaw or pip install dropclaw

Payment Chains

• Monad (eip155:143) — MON native
• Solana (solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp) — SOL native
• Base (eip155:8453) — USDC

Important

• The encryption key is generated client-side and NEVER sent to the server
• Without your key, files cannot be decrypted by anyone
• 50% of all fees go to FARNS token buyback