Coal

Coal - Commerce Infrastructure for the Agent Economy on 0G

Coal is the commerce platform for the agent economy on 0G.

It provides:

• A full merchant commerce stack - products, hosted checkout, payment links, subscriptions, paywalls, and automated revenue splits

• Autonomous wallet-based purchasing for AI agents via x402 on the same rails as humans

Pitch Deck: https://www.usecoal.xyz/coal-pitch-deck.pdf

The Problem

Today, merchants must choose between:

• Stripe

  • No crypto support

  • No autonomous agent purchasing

• Raw x402

  • Only a bare HTTP 402 handshake

  • No products, checkout, subscriptions, receipts, or dashboards

There is no complete commerce layer for the agent economy.

Coal fills this gap - and ties every payment to 0G for full verifiability.

Who Uses Coal

1. Human Shoppers

• Pay via hosted checkout links

• Use MetaMask or any Base-compatible wallet

• Receive a public receipt verification page with a 3-step proof trail

2. AI Agents

• Discover merchants via /api/agent/discover

• Programmatically create checkout sessions

• Sign ERC-3009 USDC transfers off-chain

• Receive the same 3-step proof trail as humans

Key detail:
Agents are gasless — Coal’s operator wallet submits signed transactions on their behalf.

0G Integrations - 5 Components (All on Mainnet)

1. 0G Storage (Log Layer)

• Stores payment receipts as immutable, content-addressed JSON

• Holds:

  • Encrypted merchant memory (AES-256-GCM)

  • x402 paywall manifests

• Deduplicated via payload hash

2. 0G Chain

• Contract: CoalReceiptAnchor V2

• Address: 0x24a80A3Bb16d26D4063Ecd4B2fD64C6856E25E8b

Functionality:

• Anchors SHA-256 hash of every receipt

• Uses DASigners precompile (epochNumber)

• Stamps DA epoch into each anchor event

3. 0G Compute

• Runs AI commerce queries:

  • Merchant memory lookup

  • Policy evaluation

  • Product routing

• Provides TEE attestation via:

  • broker.inference.verifyService

4. 0G KV

• Mutable mirror layer

• Keeps:

  • Merchant profiles

  • Memory pointers

• Ensures real-time freshness for agent discovery

5. 0G DA

• Streams payment events via gRPC (Singapore sidecar)

Event types:

• payment_confirmed

• subscription_created

• subscription_renewed

• webhook_delivered

• paywall_access_granted

• receipt_anchored

The Proof Trail

Every payment (human or agent) generates a 3-step verifiable proof trail:

1. Base transaction confirmed

   • USDC settled (~2s finality)

2. Receipt stored on 0G Storage

   • Immutable and content-addressed

3. Receipt hash anchored on 0G Chain

   • SHA-256 → tamper-proof

Public verification:
usecoal.xyz/verify/{session-id}

Live Today

• usecoal.xyz → Merchant console + landing

• api.usecoal.xyz → Backend (OpenAPI 3.0.3)

• coal-agent.vercel.app → Agent sandbox (autonomous purchasing)

• coal-react-checkout.vercel.app → Checkout widget demo

0G Health Check:
api.usecoal.xyz/api/0g/health
→ Returns "ok" with all 5 components operational

Previous Wins

• 🥇 1st Place - MNEE Hackathon - Devpost (https://devpost.com/software/coal-programmable-commerce)
  (Best Commerce & Creator Tooling)

Coal is now evolving into full-stack commerce infrastructure for the agent economy through the 0G APAC Hackathon.

From Checkout → Full Agent Commerce Infrastructure

Coal started as a crypto checkout platform that won 🥇 1st Place at the MNEE Hackathon.

During the 0G APAC Hackathon, it evolved into full-stack commerce infrastructure for the agent economy.

Below is exactly what shipped during the hackathon period:

New 0G Integrations (All on Mainnet)

1. 0G Chain — Receipt Anchoring (V2 Upgrade)

• Deployed CoalReceiptAnchor V2
  Address: 0x24a80A3Bb16d26D4063Ecd4B2fD64C6856E25E8b

• Upgrade details:

  • Calls DASigners precompile via epochNumber()

  • Embeds DA epoch into every anchored event

• Anchor functions:

  • anchorReceipt

  • anchorEntitlement

  • anchorProfile

2. 0G Compute — Verifiable AI Execution

• Implemented per-response TEE attestation

• Verified via:

  • broker.inference.verifyService

• Response metadata includes:

  • verificationStatus: sealed_tee

  • Provider + timestamp

3. 0G KV — Real-Time State Layer

• Merchant profile → merchant:profile:latest

• Memory pointer → merchant:memory:latest

• Paywall manifests → paywall:{id}:manifest:latest

Ensures fresh, queryable state for agents at all times

4. 0G DA — Event Streaming Pipeline

• gRPC-based streaming system with:

  • Custom .proto definitions

  • 6 event types

  • Blob dispersal + confirmation polling (≤ 5 retries)

  • Fire-and-forget non-blocking architecture

• Infrastructure:

  • Dedicated sidecar (Singapore EC2)

  • Endpoint: 54.179.237.217:51001

5. 0G Storage — Immutable Data Layer

• Published:

  • Merchant profiles

  • Encrypted memory snapshots

• Features:

  • Content-addressed storage

  • Payload hash deduplication

Agent-Native Features

Agent Discovery

• GET /api/agent/discover

• Returns:

  • Active merchants

  • Products + paywalls

  • 0G Storage roots (verifiable on-chain)

Autonomous Agent Sandbox

• Live at: coal-agent.vercel.app

Features:

• Auto-created Privy wallets per user

• Local persistence via localStorage

• MetaMask funding flow

• Balance polling (every 10s)

• Full loop:
  discover → checkout → pay → verify

Gasless Payments (ERC-3009)

• Uses transferWithAuthorization

• Flow:

  1. Agent signs USDC transfer (off-chain)

  2. Coal operator submits transaction

  3. Gas (~$0.001) covered by platform

• Result:

  • Agents never need native ETH

x402 Paywalls

• Implements full HTTP 402 flow:

  • 402 Payment Required + X-PAYMENT header

  • On-chain verification via ERC-20 event decoding

  • 200 OK content access after payment

Double-Spend Protection

• Built into execute_payment tool:

  • Verifies session existence before transfer

  • Prevents retry abuse with new sessions

Human Commerce Features

Public Receipt Verification

• Endpoint: usecoal.xyz/verify/{id}

Includes:

• 3-step proof trail

• Live badges:

  • Base transaction

  • 0G Storage

  • 0G Chain

• Direct explorer links

0G Monitoring Panel

• Real-time health across all 5 components

• Activity feed

• Manual publish-to-0G trigger

Merchant Console

• Products

• Payment links

• Paywalls

• Subscriptions

• Team management

• Transactions

• Analytics

Payment Infrastructure

• Verification cron:

  • Minimum 2-block confirmations

  • Sanctions screening

  • Atomic transaction upserts

  • Optimistic session locking

• Async anchoring:

  • Retries failed writes from backlog

Security (7 Passes)

• Timing-safe authentication

• Sanctions screening

• SSRF protection

• RBAC for financial operations

• Block confirmation enforcement

• TOCTOU protections

• Atomic verification guarantees

Developer Experience

• Full OpenAPI 3.0.3 spec

  • api.usecoal.xyz/api/docs/ui

• Public documentation:

  • Architecture

  • 0G integrations

• Example apps:

  • coal-react-checkout

  • coal-agent

  • demo-store

Current State (Live on Mainnet)

All 5/5 0G components are fully integrated and live.

• Health check:
  https://api.usecoal.xyz/api/0g/health
  → Returns "ok" with:

  • storage ✅

  • chain ✅

  • compute ✅

  • kv ✅

  • da ✅

Live Usage

• Active merchant: “Saint”

  • Real products (with images)

  • Published 0G Storage profile

    • Root: 0x37b6fefa828f5e5c53097207ee682a1c2ff2a49ee43223f6ce173f1afdb66465

• Proven in production:

  • Real autonomous agent purchases executed on Base

Funding & Outlook

Coal is currently self-funded.

• No venture capital raised

• Funded through prize winnings from the MNEE Hackathon

  • 🥇 1st Place - Best Commerce & Creator Tooling

Partnerships & Opportunities

Open to conversations with:

• Ecosystem funds

• Grant programs

• Strategic partners

Specifically those aligned with:

• Agent economy infrastructure

• On-chain commerce

• AI × crypto integrations

Go-To-Market Direction

The 0G APAC Hackathon submission serves as the foundation for public launch.

Focus:

• Crypto-native merchants

• Developers building agent-driven applications

Core value:

• A single payment infrastructure that works for:

  • Humans

  • Autonomous AI agents

• Both operating on the same rails