Planet Express Marketplace

Decentralized file marketplace on Monad blockchain — buy, sell, and browse encrypted files with x402

Planet Express Marketplace — Decentralized File Commerce

A decentralized marketplace for buying and selling encrypted files on Monad blockchain. Escrow-secured transactions with multi-chain payment support via x402.

Quick Reference

• API Base: https://dropclaw.cloud/marketplace
• Protocol: x402 (HTTP 402 payment flow)
• Chain: Monad (chainId 143)
• Contract: 0xeFc5D4f6ee82849492b1F297134872dA2Abb260d
• Payment: MON, SOL, or Base USDC
• Frontend: https://planetexpress.dropclaw.cloud

Endpoints

Browse Listings (Free)

GET /marketplace/listings

Returns all active marketplace listings.

Get Listing Detail (Free)

GET /marketplace/listing/{id}

Returns listing detail with pricing in MON/SOL/USDC.

Purchase a File (x402 Payment)

POST /marketplace/purchase
Content-Type: application/json

{
  "listingId": 123,
  "buyerAddress": "0x..."  // optional
}

Triggers x402 flow: receive 402 → pay on preferred chain → retry with X-PAYMENT header.

List a File for Sale ($30 Listing Fee)

POST /marketplace/list
Content-Type: application/json

{
  "fileId": "dropclaw-file-id",
  "title": "My File",
  "description": "What this file contains",
  "skillFileUri": "ipfs://Qm...",
  "keyHash": "0x...",
  "price": "0.5"
}

Requires x402 payment of $30 listing fee.

Purchase Flow

1. GET /marketplace/listings to browse available files
2. GET /marketplace/listing/{id} for detail + pricing
3. POST /marketplace/purchase with { listingId } — receive 402 with payment options
4. Send payment on your preferred chain (MON, SOL, or USDC on Base)
5. Retry POST with X-PAYMENT: base64(JSON({ network, txHash }))
6. Receive the encrypted file + skill file for decryption

Listing Flow

1. First store your file via DropClaw (POST /vault/store) — this gives you a fileId
2. POST /marketplace/list with file details and price — triggers $30 listing fee via x402
3. Pay the listing fee on any supported chain
4. Your file appears in the marketplace for others to purchase

Fees

Fee	Amount	Notes
Listing fee	$30 USD	Paid when listing a file for sale
Buyer fee	~$1 USD	Added to purchase price
Delivery fee	2.5%	Of listing price
FARNS buyback	50%	Half of all protocol fees buy $FARNS

Payment Chains

• Monad (eip155:143) — MON native, direct contract interaction
• Solana (solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp) — SOL, facilitated
• Base (eip155:8453) — USDC, facilitated

Frontend

The marketplace has a fully decentralized frontend hosted on IPFS:

• Web: https://planetexpress.dropclaw.cloud
• IPNS: k51qzi5uqu5di1vh2ybr8qipy8mod859fjb0i548af7qyopyctlv7zpjblukee

Install SDK: npm i dropclaw or pip install dropclaw