Stock market quote for AMGN via x402 micropayment on Base, $0.02 per request.
What it does
This endpoint provides a real-time market quote for AMGN (Amgen Inc.) through the x402 payment protocol. It is part of a broader API platform at lowpaymentfee.com that offers data & analytics, AI/ML inference, finance/Web3, and infrastructure endpoints — all gated behind x402 micropayments settled in USDC on the Base network.
The specific endpoint `/api/v1/market/quote/AMGN` accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, requiring a maximum of 20,000 base units of USDC (0.02 USD) per call, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. There are no API keys, no rate limits, and no signup — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI schema, no response examples, and no description of the fields returned in the quote response. The endpoint appears to be part of a family of finance endpoints (price feeds, exchange rates, token quotes, gas estimates) but the exact response schema for market quotes is unknown.
Capabilities
Use cases
- —Fetching a real-time or near-real-time market quote for Amgen (AMGN) stock
- —Integrating pay-per-call stock data into an autonomous agent workflow
- —Building trading bots or dashboards that pay per data request without API key management
Fit
Best for
- —Agents needing on-demand stock quotes without subscription commitments
- —Developers who want keyless, pay-per-use market data on Base
- —Low-volume or bursty access patterns where flat-rate subscriptions are wasteful
Not for
- —High-frequency trading requiring sub-millisecond latency and bulk data feeds
- —Users who need historical OHLCV or full order-book depth (not evidenced here)
- —Anyone without a Base-compatible USDC wallet or x402 client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/market/quote/AMGN \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The x402 challenge is live and confirms pricing and network details, but there is no OpenAPI schema, no response examples, and all documentation pages returned only a wallet-connect stub. The actual response format for the market quote is entirely unknown, making this effectively a stub listing.
Warnings
- —No OpenAPI or response schema available — response fields are unknown
- —All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no content
- —No example responses or field descriptions for the /market/quote endpoint
- —The broader platform lists many endpoints but none have documented schemas
Citations
- —Endpoint returns HTTP 402 with x402 challenge requiring 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/market/quote/AMGN
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/market/quote/AMGN
- —Platform advertises $0.02 per request, no API keys, no rate limits, Base networkhttps://lowpaymentfee.com
- —Platform offers finance endpoints including price feeds, exchange rates, token quotes, and gas estimateshttps://lowpaymentfee.com