News sentiment scoring for any symbol or topic

Aggregates fresh news headlines for any stock ticker, crypto symbol, or topic, then scores sentiment -100 to +100 with bull/bear drivers and a synthesis summary. $0.03/call via x402.

$0.03 USDC / call free trial: 2/day per IP contabo

Endpoint

POST https://contabo-vps.taild7e69a.ts.net/sentiment/api/sentiment

Data source: News search aggregation + LLM sentiment analysis

Parameters

Param	Type	Description
`query`	string (body JSON)	Ticker, symbol, or topic, e.g. NVDA, BTC, 'AI agents'

Example request

curl -X POST "https://contabo-vps.taild7e69a.ts.net/sentiment/api/sentiment" \
  -H "Content-Type: application/json" \
  -d '{ "query": "NVDA" }'

Example response

{
  "query": "NVDA", "score": 62, "label": "positive", "headlineCount": 14,
  "bullDrivers": ["record datacenter revenue"], "bearDrivers": ["valuation concerns"],
  "summary": "..."
}

How payment works (x402)

Call the endpoint without any payment header → you get 402 Payment Required with the exact price, the USDC contract, the network (eip155:8453 = Base), and the pay-to address.
Pay 0.03 USDC on Base to the pay-to address — with any wallet, the Coinbase CDP x402 SDK, or any x402 client library.
Retry the same request with the X-PAYMENT header set to the base64-encoded signed payment payload → 200 with JSON.

# 1. Get the 402 payment requirements
curl -s -X POST "https://contabo-vps.taild7e69a.ts.net/sentiment/api/sentiment" -H "Content-Type: application/json" -d '{ "query": "NVDA" }'

# 2. Pay 0.03 USDC on Base, then retry with the payment proof
curl -X POST "https://contabo-vps.taild7e69a.ts.net/sentiment/api/sentiment" \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <base64-signed-payment-payload>" \
  -d '{ "query": "NVDA" }'

Facilitators: Coinbase CDP and PayAI (no API key needed for either). Scheme: x402 v2 exact. Asset: USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.

Free trial

Every IP gets 2/day free calls to this endpoint — no payment needed. Free calls run automatically when you call without an X-PAYMENT header. The X-Free-Remaining response header shows how many free calls you have left today. When the quota is exhausted, the request falls through to the normal 402 payment flow.

FAQ

What does the score mean?
-100 is extremely negative, +100 extremely positive, 0 neutral. It reflects aggregate news tone, not a trading signal.

How many headlines are analyzed?
Up to 15 fresh headlines per call.

Is this financial advice?
No. A news-mood snapshot for research, not a recommendation.

Do I need an API key?
No. This API uses x402: call the endpoint, receive a 402 Payment Required with the price, pay in USDC on Base, and retry with the X-PAYMENT header. No signup, no API key, no account.

Which facilitators are supported?
Both Coinbase CDP and PayAI facilitators are supported for x402 v2 exact payments on Base (eip155:8453).

What if my payment is too low?
The facilitator verifies the on-chain amount against the price. If underpaid, you get 402 again; pay the full amount and retry.

All 37 x402 API docs · Postman collection (download) · About this API