x402 Crypto Price Tracker — Revenue Swarm Paid API

Agent-payable crypto market data and revenue intelligence over HTTP 402 / x402. No API keys. Agents pay per call in USDC on Base. Free preview available.

Live Demo

Base URL: https://x402.167-172-95-184.nip.io

Free Endpoints

Paid Endpoints (HTTP 402 → USDC payment → 200)

MCP Tools

Related MCP server: 🍋 LemonCake — Billing & budgets for AI agents

Quick Start

# 1. Try the free demo
curl https://x402.167-172-95-184.nip.io/demo

# 2. Hit a paid endpoint (returns HTTP 402 with payment requirements)
curl -i https://x402.167-172-95-184.nip.io/price/btc

# 3. Browse the MCP tool catalog
curl https://x402.167-172-95-184.nip.io/mcp/tools

# 4. Call a paid MCP tool (returns 402)
curl -X POST https://x402.167-172-95-184.nip.io/mcp/call \
  -H "Content-Type: application/json" \
  -d '{"tool":"scan_revenue_surfaces","input":{"focus":"x402"}}'

Self-Host

git clone https://github.com/AmitabhainArunachala/x402-crypto-price-tracker.git
cd x402-crypto-price-tracker

python3 -m venv .venv && source .venv/bin/activate
pip install -r requirements.txt

# Configure
export PAY_TO_ADDRESS="0xYourWalletAddress"
export X402_NETWORK="base-sepolia"  # or "base" for mainnet
export X402_PUBLIC_URL="https://your-domain.com"

# Run
uvicorn server:app --host 0.0.0.0 --port 8080

Architecture

• Framework: FastAPI + uvicorn

• Payment protocol: x402 v2 (HTTP 402 + EIP-3009 USDC TransferWithAuthorization)

• Facilitator: Coinbase x402 facilitator (https://x402.org/facilitator)

• Network: Base Sepolia (testnet) / Base Mainnet

• Data source: CoinGecko free API (no API key needed)

• Discovery: Bazaar extension on all 402 responses, .well-known/x402, OpenAPI 3.0.3

Proven Revenue

• 5 settled x402 payments on Base Sepolia ($1.04 total)

• Payment log: x402_payments.jsonl in deployment

• First settled payment: 2026-06-29T14:34:41Z

• Both micro ($0.01) and standard ($1.00) price points proven

• On-chain transaction hashes verified on BaseScan

Note: Current payments are self-pay proof-of-concept on testnet. The next milestone is a third-party paid call on Base Mainnet.

Part of Revenue Swarm

This API is one component of the Revenue Swarm — a Hermes Agent business system that:

• Scouts revenue opportunities (DealWork, MYA, BountyBook)

• Exposes paid APIs (x402)

• Coordinates sibling agents (A2A/NATS)

• Requests approval-gated spending (Stripe Link/Projects)

• Records evidence tiers (R0-R5 receipt discipline)

License

MIT