Knowmint

KnowMint

[](LICENSE) [](https://developers.cloudflare.com/workers/)

The first knowledge marketplace where AI agents pay directly with SOL — autonomously.

Humans list tacit knowledge, experiential insights, and battle-tested solutions. AI agents (Claude Code, ElizaOS, AgentKit) autonomously discover, evaluate, and purchase via the x402 protocol — paying sellers directly via non-custodial Solana P2P transfers. No private keys held by the platform.

> Human-in-the-loop mode also available: agent searches and proposes, you approve. Same marketplace, your choice of autonomy level.

Three access layers: Web UI / CLI (km) / REST API + MCP Server

Web UI

CLI / MCP (for AI Agents)

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Why KnowMint

• First for agentic payments — AI agents autonomously pay with SOL via x402 protocol. No human required to complete a purchase
• x402 autonomous purchasing — HTTP 402 + Solana P2P direct transfer. Agent finds, pays, and accesses knowledge end-to-end
• Human-in-the-loop also available — Agent proposes, you approve. Same marketplace, your choice of autonomy level
• Human → AI knowledge supply — Sell experiential and tacit knowledge that AI cannot self-generate
• Non-custodial payments — Buyer-to-seller P2P direct transfer on Solana (no platform custody)

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For AI Agents

Getting an API Key

For AI agents (wallet-based, no web UI needed):

1. POST /api/v1/auth/challenge with { "wallet": "", "purpose": "register" }
2. Sign the returned message with your Solana wallet
3. POST /api/v1/auth/register with { "wallet", "signature", "nonce" }
4. Receive { "api_key": "km_...", "user_id", "wallet" } — ready to use

For humans (web UI):

1. Sign up at knowmint.shop (or your self-hosted instance)
2. Go to Profile → API Keys
3. Create a key with read or write permission
4. Copy the key — it is shown only once

MCP Server

Add to ~/.claude/mcp.json:

{
  "mcpServers": {
    "knowmint": {
      "command": "npx",
      "args": ["--yes", "--package", "@knowmint/mcp-server@0.1.2", "mcp-server"],
      "env": {
        "KM_BASE_URL": "https://knowmint.shop"
      }
    }
  }
}

> No API key needed for initial setup. The agent can self-register using km_register.

Self-Registration (No Prior Account Needed)

1. Prepare a Solana keypair file (e.g. ~/.config/solana/id.json)
2. Call km_register with the keypair path — the tool handles challenge, signature, and registration automatically
3. The API key is saved to ~/.km/config.json and used for all subsequent calls

km_register(keypair_path: "~/.config/solana/id.json")
  → POST /api/v1/auth/challenge (get nonce)
  → Sign message with keypair
  → POST /api/v1/auth/register (get API key)
  → Saved to ~/.km/config.json — ready to use

To re-login to an existing account: km_wallet_login(keypair_path: "...").

Tool Reference

| Tool | Description | |---|---| | km_register | Register a new account with a Solana keypair and get an API key | | km_wallet_login | Re-login to an existing account and get a new API key | | km_search | Search knowledge | | km_get_detail | Get knowledge details | | km_purchase | Purchase knowledge (Solana transfer) | | km_get_content | Get purchased content (x402 gate) | | km_get_version_history | Get version history | | km_publish | Publish knowledge |

x402 Autonomous Purchase Flow

km_get_content()
  → HTTP 402 (payment_required)
  → Solana transfer
  → Retry with payment_proof
  → Content returned

> Security: Do not place config files in public repos or synced directories. Rotate keys regularly. > - Search & read only (km_search / km_get_detail / km_get_content) → read permission key > - Purchase & publish (km_purchase / km_publish) → write permission key

CLI (km)

Standalone Node.js CLI. Config stored in ~/.km/config.json.

Self-Registration

# Register with an existing Solana keypair (creates account + saves API key)
km register --keypair ~/.config/solana/id.json

# Register with auto-generated keypair (new wallet created automatically)
km register

# Re-login to an existing account
km wallet-login --keypair ~/.config/solana/id.json

Usage

km login --base-url https://knowmint.shop   # Manual API key input (if already have one)
km search "prompt engineering"
km install  --tx-hash  --deploy-to claude
km publish prompt ./prompt.md --price 0.5SOL --tags "seo,marketing"
km my purchases

--deploy-to claude,opencode auto-deploys purchased knowledge to your tools.

See cli/README.md for full documentation.

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For Humans

The web UI features a retro RPG-style design (Dragon Quest inspired). Humans can:

• List knowledge with SOL pricing, previews, and tags
• Browse a marketplace of prompts, tool definitions, datasets, and APIs
• Purchase with Phantom or Solflare wallet
• Track sales, purchases, and feedback on a personal dashboard

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Quick Start

Prerequisites: Node.js 22.6+ / npm

git clone https://github.com/Sou0327/knowmint.git
cd knowmint
npm install

# Start local Supabase (applies migrations automatically)
npx supabase start

# Copy and fill environment variables
cp .env.local.example .env.local

# Start dev server
npm run dev   # http://localhost:3000

Required Environment Variables

| Variable | Description | |---|---| | NEXT_PUBLIC_SUPABASE_URL | Supabase project URL | | NEXT_PUBLIC_SUPABASE_ANON_KEY | Supabase anon key | | SUPABASE_SERVICE_ROLE_KEY | Admin client (API routes) |

Optional (Recommended for Production)

| Variable | Description | |---|---| | NEXT_PUBLIC_SOLANA_RPC_URL | Solana RPC URL | | NEXT_PUBLIC_SOLANA_NETWORK | devnet (default) / mainnet-beta | | X402_NETWORK | x402 payment network CAIP-2 identifier | | CRON_SECRET | Cron job auth key | | UPSTASH_REDIS_REST_URL | Rate limiting (Upstash Redis) | | UPSTASH_REDIS_REST_TOKEN | Rate limiting token | | WEBHOOK_SIGNING_KEY | Webhook signature verification |

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Agent Plugins

Coinbase AgentKit (packages/agentkit-plugin/)

ActionProvider plugin for AgentKit agents.

cd packages/agentkit-plugin && npm install && npm run build

5 actions: km_search / km_get_detail / km_purchase / km_get_content / km_publish

ElizaOS (packages/eliza-plugin/)

Plugin for the ElizaOS framework.

cd packages/eliza-plugin && npm install && npm run build

import { knowmintPlugin } from "@knowmint/eliza-plugin";

const character = {
  plugins: [knowmintPlugin],
  settings: {
    KM_API_KEY: "km_xxx",
    KM_BASE_URL: "https://knowmint.shop", // optional
  },
};

Actions: SEARCH_KNOWLEDGE / PURCHASE_KNOWLEDGE / GET_CONTENT Provider: trending-knowledge (top 5 injected into context)

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API Overview

Most endpoints are protected by withApiAuth (API key auth + rate limiting). Full reference: docs/openapi.yaml / docs/api-guidelines.md

Auth (No API Key Required)

| Method | Path | Description | |---|---|---| | POST | /api/v1/auth/challenge | Get a signing challenge (wallet + purpose) | | POST | /api/v1/auth/register | Register with wallet signature → receive API key | | POST | /api/v1/auth/login | Re-login with wallet signature → receive new API key |

Knowledge

| Method | Path | Description | |---|---|---| | GET | /api/v1/knowledge | List knowledge | | POST | /api/v1/knowledge | Create knowledge | | POST | /api/v1/knowledge/batch | Batch get | | GET | /api/v1/knowledge/{id} | Get details | | PATCH | /api/v1/knowledge/{id} | Update | | POST | /api/v1/knowledge/{id}/publish | Publish | | POST | /api/v1/knowledge/{id}/purchase | Purchase (Solana TX verification) | | GET | /api/v1/knowledge/{id}/content | Get content (x402 gate) | | POST | /api/v1/knowledge/{id}/feedback | Submit feedback |

User

| Method | Path | Description | |---|---|---| | GET | /api/v1/me/purchases | Purchase history | | GET | /api/v1/me/listings | My listings | | POST | /api/v1/me/wallet/challenge | SIWS challenge | | POST | /api/v1/me/wallet/verify | Wallet verification |

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Tech Stack

| Layer | Technology | |---|---| | Frontend | Next.js 16 (App Router) + React 19, TypeScript, Tailwind CSS v4 | | Backend / DB | Supabase (PostgreSQL, Auth, Storage, RLS) | | Payments | Solana (non-custodial P2P, Anchor 0.32) | | Rate Limiting | Upstash Redis | | MCP | @knowmint/mcp-server (@modelcontextprotocol/sdk) | | Deploy | Cloudflare Workers (opennextjs-cloudflare) | | Testing | Mocha/Chai (unit/integration), Vitest (components) |

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Testing

# Unit tests (202 tests, Mocha/Chai)
npm run test:unit

# Component tests (Vitest)
npm run test:components

# Staging integration tests (requires supabase start)
npm run test:staging

# E2E tests
npm run test:e2e:fake-tx        # Fake transaction rejection
npm run test:e2e:cli-flow       # CLI flow (login/search/install/publish/deploy)
npm run test:e2e:cli-purchase   # CLI purchase flow
npm run test:e2e:x402-flow      # HTTP 402 payment gate
npm run test:e2e:devnet         # Devnet SOL transfer → purchase → content

For local devnet testing with a full purchase flow, see [Local Devnet Testing Guide](docs/local-devnet-guide.md).

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Deployment

Deployed to Cloudflare Workers via opennextjs-cloudflare.

npm run build:cf    # Build + strip @vercel/og WASM
npm run deploy:cf   # Deploy to production

CI/CD (.github/workflows/deploy.yml):

• Push to main → auto-deploy to production Worker
• PR created → auto-deploy to preview Worker
• PR closed → preview Worker deleted

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Contributing

1. Fork the repository
2. Create a feature branch (git checkout -b feature/my-feature)
3. Commit your changes
4. Push to the branch and open a Pull Request

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License

[MIT](LICENSE)

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: Sou0327
• Source: Sou0327/knowmint
• License: MIT
• Homepage: https://knowmint.shop/

Install and usage instructions live in the source repository linked above.