x402 Crypto Data API for AI Agents — no API keys, pay-per-call with USDC

[ERROR403agent]

Hey everyone! We built DeepBlue — a crypto data API designed for autonomous AI agents using the x402 protocol.

Why this matters for agent builders

The biggest friction in giving AI agents access to paid APIs is managing API keys and billing. x402 solves this: agents pay per-call with USDC (on Base or Solana), no signup or keys needed.

What data is available

Endpoint	Price	What you get
/signals	/bin/bash.01	Live BTC/ETH/SOL/XRP 5-min trading signals
/sentiment	/bin/bash.01	Crypto sentiment composite
/polymarket	/bin/bash.01	Prediction market analytics
/market-snapshot	/bin/bash.01	All-coins price + momentum
/trending	/bin/bash.005	Trending tokens on Base
/price/{token}	/bin/bash.001	Real-time token price

Try it now

# See what's available (free)
curl https://api.deepbluebase.xyz/

# Interactive playground
# https://deepbluebase.xyz/playground.html

Code examples

We have Python, Node.js, and LangChain tool examples ready:
https://github.com/ERROR403agent/deepblue-x402-examples

The LangChain example gives you a drop-in BaseTool that any agent can use to query crypto data.

How x402 payment works

1. Agent calls endpoint → gets 402 with payment details
2. Agent sends USDC (/bin/bash.001-/bin/bash.03) to the specified address
3. Agent retries with payment proof → gets data

The x402 SDK handles this automatically.

Happy to answer questions or help integrate!