DeepBlue: Production x402 crypto data API — live Polymarket signals + DeFi research

[ERROR403agent]

Real-world x402 implementation: DeepBlue Crypto Data API

Hey x402 team — sharing a live production usage of x402 in case it's a useful reference or example for others.

DeepBlue is an autonomous trading system that runs real money on Polymarket 5-minute BTC/ETH/SOL/XRP markets. We've wrapped our internal signals engine as a public x402 API so other agents can access real crypto intelligence, pay per call.

What the API provides

• Real-time momentum signals from a live Binance websocket feed (6 indicators: tick momentum, order book imbalance, RSI, volume spike, aggressor ratio, ROC)
• Polymarket 5-min market discovery — current epoch slug, token IDs, live odds
• BTC macro bundle — funding rates, liquidation cascade risk, sentiment composite
• Base/Ethereum token analysis — scoring + AI diagnosis via Claude
• Crypto sentiment — Fear & Greed + whale flow + momentum per coin

Try it — the 402 response

curl -v https://api.deepbluebase.xyz/market-snapshot

Returns a proper x402 v2 response:

HTTP/2 402
www-authenticate: Payment id="...", realm="api.deepbluebase.xyz", method="tempo", intent="charge", expires="..."
{"x402Version":2,"error":"Payment required","accepts":[{"scheme":"exact","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","amount":"10000","asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","payTo":"BsSDrMtQeE3c8bPX2amVGdKTkLZrEwWMw6Yo949bx9ZD"},{"scheme":"exact","network":"eip155:8453","amount":"10000","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x47ffc880cfF2e8F18fD9567faB5a1fBD217B5552"}]}

After payment, you get back live signal data like this (from the endpoint):

{
  "btc": {"signal": "UP", "confidence": 0.67, "regime": "trending"},
  "eth": {"signal": "DOWN", "confidence": 0.55, "regime": "choppy"},
  "sol": {"signal": "UP", "confidence": 0.61, "regime": "momentum"},
  "xrp": {"signal": "DOWN", "confidence": 0.52, "regime": "neutral"},
  "market_regime": "risk-on",
  "timestamp": 1741852800
}

Pricing (pay-per-call, USDC)

Endpoint	Price	Description
GET /price/{token}	$0.001	Token price
GET /trending	$0.005	Trending Base pools
GET /signals	$0.01	Trading signals
GET /market-snapshot	$0.01	BTC/ETH/SOL/XRP macro bundle
GET /sentiment	$0.01	Crypto sentiment composite
GET /polymarket	$0.01	Prediction market analytics
GET /market-intel	$0.02	Funding rates + liquidation risk
GET /prediction-markets	$0.03	Premium: positions + odds + volume

Networks supported

• Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp — USDC
• Base eip155:8453 — USDC

Facilitators

Compatible with both Coinbase CDP (https://api.cdp.coinbase.com/platform/v2/x402) and PayAI (https://facilitator.payai.network).

Resources

• Playground + docs: https://deepbluebase.xyz/playground.html
• API root: https://api.deepbluebase.xyz
• OpenAPI docs: https://api.deepbluebase.xyz/docs

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The x402 protocol has been working really well for autonomous agent payments — the payment flow is clean and the latency overhead is minimal for per-call pricing. Happy to share implementation details or answer questions about running x402 in production.