Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/transactions/241` is listed as "Premium API Access" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which is 6 decimals = $0.02). Payment is handled via the x402 protocol — no API keys, no subscriptions, just an X-PAYMENT header with each request.
The platform advertises four endpoint categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints appear to share the same $0.02/request pricing. The x402 challenge confirms the endpoint is live, accepts POST requests, and settles payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.
Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no actual content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the `/api/v1/transactions/241` endpoint actually returns. The endpoint name "Premium API Access" is generic and does not clarify its function. Without documentation, it is unclear what input this specific endpoint expects or what data it returns.
Capabilities
Use cases
- —Programmatic access to data/analytics endpoints without subscription commitments
- —Agent-driven API consumption with per-call crypto micropayments
- —Accessing financial data or utility services via x402 protocol
Fit
Best for
- —Developers wanting zero-friction API access without API key management
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer pay-as-you-go pricing at $0.02 per request
Not for
- —Users needing detailed API documentation or schemas before integration
- —High-volume consumers who would benefit from bulk/subscription pricing
- —Anyone unable to transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/241 \
-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 zero documentation for this specific endpoint — no input schema, no output schema, no examples. The endpoint name 'Premium API Access' is generic and uninformative. All doc pages return only 'Connect wallet' with no content.
Warnings
- —No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no actual content
- —No OpenAPI spec or request/response schema provided for any endpoint
- —The specific function of /api/v1/transactions/241 ('Premium API Access') is unclear — it could be anything
- —Cannot verify what data or service this endpoint actually provides
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/transactions/241
- —All listed endpoints are priced at $0.02 per request with no API keys, no rate limitshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/transactions/241
- —Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com