Pay-per-call stock quote API for COIN, settled in USDC on Base via x402.
What it does
This endpoint at lowpaymentfee.com provides stock data for the ticker COIN (Coinbase Global) via a simple POST request, paid per-call using the x402 protocol. Each request costs $0.02 in USDC on the Base network — no API keys, no rate limits, and no subscriptions required. The payment is settled on-chain to a specified wallet address.
The endpoint is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance/crypto market data, and utility services, all at the same $0.02/request price point. The specific endpoint probed here (`/api/v1/stocks/COIN`) is not listed on the homepage's catalog, but it follows the same x402 payment pattern and pricing as the other endpoints.
Documentation is extremely sparse — the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no example request/response payloads, and no description of what fields the stock data response contains. The endpoint is confirmed live (returns a valid x402 402 challenge), but without documentation or sample responses, the exact shape of the returned data is unknown.
Capabilities
Use cases
- —Fetching real-time or recent stock data for Coinbase (COIN) without needing an API key or subscription
- —Integrating stock lookups into autonomous agents that can pay per-call with USDC on Base
- —Building trading dashboards or alerts that pull COIN price data on demand
Fit
Best for
- —Agents or bots that need keyless, on-demand stock data with crypto micropayments
- —Developers prototyping financial tools who want zero-commitment API access
- —x402-compatible wallets and agent frameworks looking for pay-per-use data feeds
Not for
- —High-frequency trading requiring sub-millisecond latency and guaranteed SLAs
- —Users who need comprehensive multi-ticker stock data in bulk
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stocks/COIN \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — no OpenAPI schema, no example requests or responses, and no description of the response payload. The specific /stocks/COIN path isn't even listed on the provider's homepage catalog. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no content
- —No OpenAPI or response schema provided; the shape of the stock data response is unknown
- —The /api/v1/stocks/COIN endpoint is not listed in the provider's homepage API catalog
- —Cannot verify what data fields are returned or how current the stock data is
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units (USDC, 6 decimals = $0.02) on Base networkhttps://lowpaymentfee.com/api/v1/stocks/COIN
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Basehttps://lowpaymentfee.com