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 set of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.
The specific endpoint at `/api/v1/customers/13` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The platform's landing page confirms a uniform $0.02/request pricing across all listed endpoints.
Other endpoints on the same platform include sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation. Documentation pages were largely empty (showing only a "Connect wallet" prompt), so detailed request/response schemas for this specific endpoint are not available. The endpoint is live and returns a proper 402 challenge.
Capabilities
Use cases
- —Accessing premium customer data on a per-request basis without subscriptions
- —Agent-driven workflows that need on-demand API calls settled in USDC
- —Prototyping integrations without managing API keys or rate limits
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing low-cost per-call pricing ($0.02) without signup
Not for
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —High-volume consumers who would benefit from bulk/subscription pricing
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/13 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, documentation pages are effectively empty, there is no OpenAPI schema, no request/response examples, and the purpose of the `/api/v1/customers/13` endpoint is unclear beyond the generic label "Premium API Access."
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) all return only a 'Connect wallet' prompt with no actual content.
- —No OpenAPI or request/response schema available — the exact input format and response structure for /api/v1/customers/13 are unknown.
- —The purpose of the 'customers/13' endpoint is ambiguous; it may be a demo or placeholder resource.
Citations
- —Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limitshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)https://lowpaymentfee.com/api/v1/customers/13
- —Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com