Pay-per-call stock quote API for AXP (American Express) via x402 on Base, settled in USDC.
What it does
This endpoint at lowpaymentfee.com provides stock data for AXP (American Express) through a simple POST request, paid per call using the x402 protocol. Each request costs $0.02 in USDC on the Base network — no API keys, no rate limits, and no subscriptions required. The payment is settled on-chain to a specified wallet address.
The provider operates a broader platform offering dozens of pay-per-call endpoints across categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all at the same $0.02/request price point. The specific endpoint probed here (`/api/v1/stocks/AXP`) appears to be a stock-specific route, likely returning quote or price data for the American Express (AXP) ticker symbol.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no example request/response payloads, and no description of the response format beyond the MIME type `application/json`. The endpoint is confirmed live via a valid x402 402 challenge.
Capabilities
Use cases
- —Fetching real-time or recent stock data for American Express (AXP) without needing an API key or subscription
- —Integrating stock lookups into autonomous AI agents that can pay per call via x402
- —Building lightweight financial dashboards that pay only for the data they consume
Fit
Best for
- —Agents or bots that need on-demand stock quotes without managing API credentials
- —Developers experimenting with x402 pay-per-call patterns for financial data
- —Low-volume stock data consumers who want to avoid subscription commitments
Not for
- —High-frequency trading or bulk historical data retrieval (no documented batch endpoints)
- —Users who need comprehensive documentation or guaranteed SLAs
- —Anyone without a Base-network USDC wallet for payment
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stocks/AXP \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no example request/response, and all documentation pages returned only a wallet-connect prompt. The actual response format and data fields are entirely unknown.
Warnings
- —No documentation available — all doc pages return only a 'Connect wallet' prompt
- —No OpenAPI or output schema describing the response payload
- —No example requests or responses available; response structure is unknown
- —The /api/v1/stocks/AXP path is not listed on the provider's homepage among their advertised endpoints, so its availability and behavior are uncertain
Citations
- —The endpoint returns a 402 x402 challenge requesting $0.02 USDC on Base networkhttps://lowpaymentfee.com/api/v1/stocks/AXP
- —The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stocks/AXP
- —Documentation, API, pricing, and README pages all show only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs