Pay-per-call stock quote API for COST (Costco) via x402 on Base, settled in USDC.
What it does
This endpoint at lowpaymentfee.com provides stock data for the ticker COST (Costco Wholesale) through an x402 payment-gated API. Each request 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 broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/crypto market data, and utility services, all priced at $0.02 per request. The specific `/api/v1/stocks/COST` endpoint is not listed on the homepage catalog but follows the same x402 payment pattern and pricing tier as the other endpoints. Because there is no published OpenAPI schema, request body format, or example response, the exact fields returned (e.g., current price, volume, historical data) are unknown and must be discovered by making a paid call.
Payment is handled via the x402 protocol: the endpoint returns a 402 challenge advertising USDC (contract 0x8335…2913) on Base with a maxAmountRequired of 20000 base units (i.e., $0.02). Callers attach an X-PAYMENT header with a signed payment proof to receive the response. Timeout for payment settlement is 300 seconds.
Capabilities
Use cases
- —Fetching current or recent stock data for Costco (COST) in an automated trading or research pipeline
- —Integrating stock quotes into an AI agent workflow without managing API keys or subscriptions
- —Paying for individual stock data requests using USDC on Base without a traditional billing account
Fit
Best for
- —Agents or bots that need on-demand stock data without subscription overhead
- —Developers experimenting with x402 payment-gated APIs
- —Crypto-native applications that want to pay for data in USDC on Base
Not for
- —High-frequency trading requiring sub-millisecond latency and bulk data feeds
- —Users who need comprehensive historical stock data or full market coverage across many tickers
- —Anyone without a Base-compatible wallet or USDC balance
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stocks/COST \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-proof>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response format, no example payloads, and the /stocks/COST path is not listed on the provider's own homepage catalog. Effectively a stub with verified liveness.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The /api/v1/stocks/COST path is not listed on the provider's homepage — it may be undocumented or experimental
- —Request body format and response fields are completely unknown; no examples exist in crawled material
- —Docs, pricing, API, and README pages all returned only 'Connect wallet' with no useful content
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC on Base, maxAmountRequired 20000 base unitshttps://lowpaymentfee.com/api/v1/stocks/COST
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stocks/COST
- —Provider advertises $0.02/request, no API keys, no rate limits, Base networkhttps://lowpaymentfee.com
- —Provider catalog includes finance, AI, data analytics, and utility endpoints all at $0.02https://lowpaymentfee.com