Stock market quote for SPGI via x402 micropayment on Base, $0.02 per request.
What it does
This endpoint provides a market quote for the ticker symbol SPGI (S&P Global Inc.) through the x402 payment protocol. It is part of a broader suite of pay-per-call APIs hosted at lowpaymentfee.com, which spans data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints on the platform share a uniform pricing model of $0.02 per request, settled in USDC on the Base network.
The specific endpoint at `/api/v1/market/quote/SPGI` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers include an `X-PAYMENT` header with a signed payment of up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals). No API keys, subscriptions, or rate limits are advertised — access is gated purely by micropayment.
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 (returns a proper 402 challenge), but the actual data source, field schema, and freshness guarantees for the quote data are unknown.
Capabilities
Use cases
- —Fetching a real-time or recent market quote for S&P Global (SPGI) from an AI agent workflow
- —Integrating pay-per-call stock data into a trading bot or portfolio tracker without managing API keys
- —Demonstrating x402 micropayment-gated data access on the Base L2 network
Fit
Best for
- —Agents or bots that need on-demand stock quotes without subscription overhead
- —Developers experimenting with x402 payment-gated APIs
- —Low-volume, pay-as-you-go market data consumers
Not for
- —High-frequency trading requiring sub-millisecond latency and guaranteed SLAs
- —Users who need bulk historical market data downloads
- —Anyone requiring documented, auditable data provenance for compliance purposes
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/market/quote/SPGI \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no example request or response, and all documentation pages are empty stubs. The actual data returned is completely undocumented, making this effectively a stub listing.
Warnings
- —No documentation available — /docs, /api, /pricing, and /README all return only a wallet-connect prompt with no content.
- —No OpenAPI or output schema provided; response format for the market quote is unknown.
- —Data source, freshness, and accuracy of the SPGI quote are undisclosed.
- —The platform lists many diverse API categories (AI, analytics, finance, utilities) all at $0.02 — unclear whether all are fully implemented or placeholders.
Citations
- —Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/market/quote/SPGI
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/market/quote/SPGI
- —Documentation pages (/docs, /api, /pricing, /README) contain only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs