# Momentum Brief

> Live DexScreener + CoinGecko momentum brief for any token, $0.10 USDC via x402

Use for a short, sourced snapshot of a crypto token's market momentum. POST a symbol (ETH), contract, chain:address or topic; get an 8-12 line templated brief from live DexScreener and CoinGecko data (price, 24h/7d change, mcap, liquidity, volume, buy/sell mix, trending, rule-based momentum/risk notes), each figure source- and time-tagged. Base, Solana, Ethereum and more. No-data queries return 404, not charged. $0.10 USDC on Base. Not trading advice.

Canonical: https://momentum-brief.fly.dev

## Endpoint
- POST https://momentum-brief.fly.dev/v1/brief — JSON body {"query": "<symbol | contract | chain:address | topic>"}
- Payment: x402 v2, scheme exact, $0.10 USDC (amount 100000, 6 decimals) on Base eip155:8453, asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, payTo 0xAa8b7a2fdA07F6afF946e03BC1e7A1CFc6ac302E
- Unpaid request returns 402 with requirements in the body and PAYMENT-REQUIRED header; retry with PAYMENT-SIGNATURE.
- 200: {receipt_id, query, brief, mode, transaction}; 404 no_data is not charged.

## Example (unpaid, returns 402)
```
curl -i -X POST https://momentum-brief.fly.dev/v1/brief \
  -H 'Content-Type: application/json' \
  -d '{"query":"ETH"}'
```

## Docs
- [OpenAPI](https://momentum-brief.fly.dev/openapi.json)
- [x402 manifest](https://momentum-brief.fly.dev/.well-known/x402)
- [Health](https://momentum-brief.fly.dev/health)

Public-signal only, not trading advice.