Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/charges/210` is labeled "Premium API Access" and requires a USDC payment of up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payments are settled on-chain to a designated wallet address, with no API keys, rate limits, or upfront commitments required.
The broader platform advertises endpoints across four 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 are listed at $0.02 per request. The x402 challenge confirms the endpoint is live and accepts POST requests returning application/json.
Note that while the landing page lists many endpoints, the specific `/api/v1/charges/210` endpoint's actual functionality is not clearly documented beyond the generic "Premium API Access" label. There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further documentation. The actual behavior of this endpoint — what data it returns or what input it expects — remains unclear from available materials.
Capabilities
Use cases
- —Accessing premium API data without creating an account or managing API keys
- —Making one-off paid API calls settled in USDC on Base
- —Agent-driven workflows that need permissionless, pay-as-you-go API access
Fit
Best for
- —Developers who want zero-signup, pay-per-use API access
- —AI agents that can autonomously pay for API calls via x402
- —Users already holding USDC on the Base network
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who need bulk pricing or subscription discounts
- —Developers who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/210 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no meaningful documentation — the docs pages all render only 'Connect wallet'. The actual functionality behind 'Premium API Access' at /api/v1/charges/210 is unknown.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —Docs, pricing, and API pages render only 'Connect wallet' with no usable content
- —The specific functionality of /api/v1/charges/210 ('Premium API Access') is not described anywhere
- —No request or response examples are available to confirm what this endpoint actually does
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/charges/210
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/charges/210
- —All endpoints listed at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com