Pay-per-call stock market quote for AMD via x402 on Base, settled in USDC.
What it does
This x402 endpoint at lowpaymentfee.com provides a market quote for AMD (Advanced Micro Devices) stock. It is part of a broader suite of pay-per-request APIs offered by the same provider, spanning finance, AI/ML, data analytics, and utility categories. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) at $0.02 per request (20,000 base units with 6 decimals).
The provider advertises a simple pricing model: $0.02 per request across all endpoints, with no API keys, no rate limits, no minimums, and instant access. The x402 challenge was successfully captured, confirming the endpoint is live and responds with a valid 402 payment challenge. However, documentation is extremely thin — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no example request/response payloads, and no description of the response schema for the AMD quote endpoint specifically.
Because of the lack of documentation, the exact fields returned in the market quote response are unknown. It is reasonable to infer that the response contains price and possibly volume/change data for AMD stock, but this cannot be confirmed from the available material.
Capabilities
Use cases
- —Fetching real-time or recent AMD stock quote data for trading bots or dashboards
- —Integrating AMD market data into an AI agent workflow without managing API keys
- —On-demand stock price lookups settled with USDC on Base
Fit
Best for
- —Agents or apps needing quick AMD stock quotes without subscription commitments
- —Developers wanting keyless, crypto-settled market data access
- —Low-volume or sporadic stock price lookups at $0.02 per call
Not for
- —High-frequency trading requiring sub-millisecond latency and bulk data
- —Users needing comprehensive historical OHLCV data or full market depth
- —Anyone without a Base-network USDC wallet for payment
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/market/quote/AMD \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI spec, no documented request/response schema, no example payloads, and all documentation pages are empty beyond a wallet-connect prompt. The actual data returned is entirely unknown.
Warnings
- —No OpenAPI or schema documentation available — response format for AMD quote is unknown
- —All doc/pricing/README pages render only 'Connect wallet' with no technical content
- —Cannot confirm whether this returns real-time, delayed, or historical quote data
- —Provider appears to be a generic multi-category API platform; quality and reliability of underlying data sources is unclear
Citations
- —Endpoint returns 402 with x402 challenge requiring USDC on Base network at 20000 base units ($0.02)https://lowpaymentfee.com/api/v1/market/quote/AMD
- —Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/market/quote/AMD