Pay-per-call stock data for UNP (Union Pacific) via x402 on Base, settled in USDC.
What it does
This endpoint at lowpaymentfee.com provides stock data for the ticker UNP (Union Pacific Corporation) through a pay-per-request x402 protocol. Each call costs $0.02 in USDC on the Base network — no API keys, no rate limits, and no subscriptions required. The endpoint accepts POST requests and returns JSON.
The provider, lowpaymentfee.com, hosts a broad catalog of x402-enabled APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services, all priced uniformly at $0.02 per request. The specific endpoint `/api/v1/stocks/UNP` falls under the finance category and presumably returns stock price or quote data for Union Pacific. However, the crawled documentation is extremely thin — the docs, pricing, and API pages all resolve to a "Connect wallet" prompt with no further detail on request/response schemas, supported fields, or data freshness.
Because there is no OpenAPI spec, no example responses, and no documentation beyond the landing page listing, the exact shape of the returned data is unknown. The x402 challenge is live and well-formed (402 returned with a valid accepts block), confirming the endpoint is operational. Agents should send a POST with an `X-PAYMENT` header containing a valid x402 payment proof for 20,000 base units of USDC (0.02 USD) on Base to receive a response.
Capabilities
Use cases
- —Fetching current or recent stock data for Union Pacific (UNP) without managing API keys or subscriptions
- —Integrating stock lookups into autonomous agent workflows that settle payments on-chain
- —Building trading dashboards or alerts that pay per data request via USDC on Base
Fit
Best for
- —Agents or apps that need occasional stock lookups without subscription overhead
- —Developers experimenting with x402 pay-per-call APIs
- —On-chain-native workflows that prefer USDC micropayments over traditional billing
Not for
- —High-frequency trading requiring sub-millisecond latency and bulk data feeds
- —Users who need comprehensive historical stock data or full OHLCV candles (no evidence this is supported)
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stocks/UNP \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no example data, and the documentation pages are empty beyond a wallet-connect prompt. The actual content returned for the UNP stock endpoint is entirely unknown.
Warnings
- —No documentation available — docs, pricing, and API pages all show only a 'Connect wallet' prompt with no technical detail.
- —No request or response schema is published; the shape of the returned stock data is unknown.
- —No information on data source, freshness, or coverage for the /stocks/ endpoints.
- —The endpoint is listed generically as 'Premium API Access' with no stock-specific description from the provider.
Citations
- —Endpoint returns HTTP 402 with x402 challenge requiring 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)https://lowpaymentfee.com/api/v1/stocks/UNP
- —All APIs on lowpaymentfee.com are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The provider lists finance endpoints under 'Finance & Web3' including price feeds and exchange rateshttps://lowpaymentfee.com