Pay-per-call financial price feeds via x402 on Base for $0.02/request in USDC.
What it does
The `/api/v1/finance/prices` endpoint on lowpaymentfee.com provides financial price feed data accessible through the x402 payment protocol. Each request costs $0.02, paid in USDC on the Base network, with no API keys, rate limits, or subscriptions required. The endpoint accepts POST requests and returns JSON responses.
This endpoint is part of a broader platform offering 16+ pay-per-call APIs spanning finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), AI/ML (sentiment analysis, summarization, classification, embeddings), data analytics (metrics, reports, insights, data export), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing model.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what parameters the price feeds endpoint accepts or what data it returns. The x402 challenge confirms the endpoint is live and accepting payment, but the actual capabilities and data format remain unclear.
Capabilities
Use cases
- —Fetching real-time financial price data without API key registration
- —Agent-driven market data retrieval with per-call micropayments
- —Integrating price feeds into Web3 applications using on-chain payment
Fit
Best for
- —Developers wanting instant access to price data without signup
- —AI agents that need pay-as-you-go financial data
- —Web3 applications already operating on Base network
Not for
- —High-frequency trading requiring sub-cent per-call costs or bulk pricing
- —Users needing well-documented APIs with clear request/response schemas
- —Applications requiring guaranteed SLAs or support contracts
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/finance/prices \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base), but documentation is effectively nonexistent — no request/response schema, no parameter descriptions, no examples. The actual data returned by the price feeds endpoint is unknown.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content
- —No OpenAPI schema or request/response examples available
- —Unclear what financial instruments or data the price feeds endpoint covers
- —No information on data sources, freshness, or accuracy guarantees
Citations
- —Endpoint returns 402 with x402 challenge accepting USDC on Base networkhttps://lowpaymentfee.com/api/v1/finance/prices
- —Price is $0.02 per request (maxAmountRequired 20000 in USDC base units = 0.02 USDC)https://lowpaymentfee.com
- —Platform advertises no API keys, no rate limits, instant accesshttps://lowpaymentfee.com
- —The /api/v1/finance/prices endpoint is listed under Finance & Web3 as 'Price Feeds'https://lowpaymentfee.com