Pay-per-call market quote for RTX via x402 on Base, settled in USDC at $0.02/request.
What it does
This endpoint at lowpaymentfee.com provides a market quote for "RTX" (likely an NVIDIA RTX GPU or related asset ticker) via a simple POST request. It is part of a broader platform offering data, analytics, AI, finance, and utility APIs, all priced at $0.02 per request with no API keys, no rate limits, and no commitments required.
Payment is handled through the x402 protocol on the Base network. The endpoint accepts USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a max amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The payment scheme is "exact," meaning the caller pays a fixed amount per request. The response MIME type is application/json. The x402 challenge was successfully captured, confirming the endpoint is live.
Documentation is extremely sparse — the /docs, /pricing, /api, and /README pages all returned 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 RTX quote response contains. The specific meaning of "RTX" in this context (stock ticker, GPU pricing, crypto token, etc.) is not documented anywhere on the site.
Capabilities
Use cases
- —Fetching a real-time market quote for RTX on demand
- —Integrating pay-per-call market data into an agent workflow
- —Programmatic price lookups without managing API keys or subscriptions
Fit
Best for
- —Agents needing on-demand market quotes with no subscription overhead
- —Developers experimenting with x402 micropayment-gated APIs
- —Low-volume or sporadic market data consumers who prefer pay-per-use
Not for
- —High-frequency trading requiring sub-millisecond latency and bulk pricing
- —Users who need detailed documentation or guaranteed SLAs
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/market/quote/RTX \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The meaning of 'RTX' is undocumented, and all doc pages return only 'Connect wallet'.
Warnings
- —No OpenAPI or schema documentation available
- —No request or response examples provided anywhere on the site
- —The meaning of 'RTX' (stock ticker, GPU, crypto token, etc.) is not documented
- —All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no content
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/market/quote/RTX
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/market/quote/RTX