Stock market quote for BRK.B via x402 micropayment on Base, $0.02 per request.
What it does
This endpoint provides a real-time market quote for Berkshire Hathaway Class B (BRK.B) stock, accessible via the x402 payment protocol. It is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-call APIs spanning finance, AI/ML, data analytics, and utility services. Each request costs $0.02, settled in USDC on the Base network — no API keys, no rate limits, and no subscriptions required.
The specific endpoint `/api/v1/market/quote/BRK.B` accepts POST requests and returns JSON. The x402 challenge was successfully captured, confirming the endpoint is live. Payment is made via the x402 "exact" scheme to a specified wallet address, with a maximum timeout of 300 seconds per payment session. The asset used for payment is USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base).
Documentation beyond the landing page is sparse — the /docs, /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no response schema, and no example responses available. The exact fields returned in the quote response are unknown and must be discovered by making a paid call.
Capabilities
Use cases
- —Fetching a real-time BRK.B stock quote from an AI agent without needing API keys
- —Integrating pay-per-call stock data into automated trading or portfolio monitoring workflows
- —Demonstrating x402 micropayment protocol usage for financial data access
Fit
Best for
- —Agents or bots that need on-demand stock quotes without subscription overhead
- —Developers experimenting with x402 payment-gated APIs
- —Low-volume or sporadic stock price lookups where $0.02/call is economical
Not for
- —High-frequency trading requiring sub-second latency and bulk data
- —Users who need historical price data, charts, or full market depth
- —Anyone without a Base-network USDC wallet to make x402 payments
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/market/quote/BRK.B \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI spec, no documented request/response schema, no example responses, and all documentation pages return only a wallet-connect prompt. The actual data returned by this endpoint is unknown.
Warnings
- —No OpenAPI or response schema available — the structure of the quote response is undocumented
- —All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no content
- —The endpoint path suggests BRK.B specifically; it is unclear whether other ticker symbols are supported at similar paths
- —No example responses are available to verify data quality or field coverage
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/market/quote/BRK.B
- —Price is $0.02 per request (maxAmountRequired 20000 base units of USDC with 6 decimals)https://lowpaymentfee.com/api/v1/market/quote/BRK.B
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/market/quote/BRK.B