Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall on the Base network. The specific resource at `/api/v1/charges/315` accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is settled on-chain with no API keys, no rate limits, and no sign-up required.
The broader lowpaymentfee.com platform advertises a suite of x402-gated endpoints spanning 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 are listed at the same $0.02/request price point.
However, the specific endpoint `/api/v1/charges/315` is labeled only as "Premium API Access" with no further documentation on what data or functionality it returns. The docs, pricing, and API pages on the site all render only a "Connect wallet" prompt with no additional content. Without schema details or example responses, it is unclear what payload this particular endpoint produces.
Capabilities
Use cases
- —Accessing a pay-per-request API without needing API keys or subscriptions
- —Programmatic agent-driven API consumption with on-chain USDC settlement
- —Testing x402 payment protocol integrations on the Base network
Fit
Best for
- —Developers experimenting with x402 payment flows
- —Agents that need keyless, on-demand API access settled in USDC on Base
- —Low-volume, pay-as-you-go API consumption without commitments
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —High-volume use cases where $0.02/request adds up without bulk discounts
- —Anyone without a Base-compatible wallet holding USDC
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/315 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example request/response, and the docs pages are empty ('Connect wallet' only). The specific functionality behind '/api/v1/charges/315' is entirely undocumented, making this effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, and API pages all render only 'Connect wallet'
- —The specific resource /api/v1/charges/315 has no description beyond 'Premium API Access'; actual functionality is unknown
- —No OpenAPI schema, no example requests or responses provided
- —No robots.txt or agents.txt found
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/charges/315
- —All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/charges/315