Stock data for ticker C via x402 micropayment on Base, $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides stock-related data for the ticker symbol "C" (Citigroup) through the x402 payment protocol. It is part of a broader platform offering data & analytics, AI/ML inference, finance, crypto, and utility APIs — all priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or subscriptions required.
The specific endpoint `/api/v1/stocks/C` accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, requesting a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals) which equals $0.02. Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
Documentation is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the stocks endpoint returns. The endpoint appears to be part of a pattern where each path is a separate x402-gated resource, but the actual data schema must be discovered by making a paid call.
Capabilities
Use cases
- —Fetching current or recent stock data for Citigroup (ticker C) without needing an API key or subscription
- —Integrating pay-per-call stock lookups into an AI agent workflow using x402
- —Prototyping financial dashboards with low-commitment, per-request pricing
Fit
Best for
- —Agents or developers who want keyless, on-demand stock data with crypto micropayments
- —Low-volume or sporadic stock data needs where subscriptions are overkill
- —x402-native applications on the Base network
Not for
- —High-frequency trading or bulk historical data retrieval (no documented batch endpoints)
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Non-crypto users who cannot pay in USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stocks/C \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is zero documentation on request parameters, response schema, or what stock data is actually returned. Docs pages are empty beyond a wallet connect prompt. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
- —No request or response schema documented; actual data fields are unknown
- —No OpenAPI spec or examples provided
- —The /api/v1/stocks/C path suggests per-ticker endpoints but the full set of supported tickers is undocumented
- —Cannot confirm what stock data (price, volume, fundamentals, etc.) is returned without making a paid request
Citations
- —Endpoint returns HTTP 402 with x402 challenge requesting 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stocks/C
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stocks/C
- —All APIs priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categorieshttps://lowpaymentfee.com