Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The specific resource `/api/v1/charges/213` accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is handled inline via the X-PAYMENT header with no API keys or rate limits required.
The broader lowpaymentfee.com platform advertises a suite of APIs 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. However, the specific endpoint being listed here (`/api/v1/charges/213`) is labeled only as "Premium API Access" without further detail on what data or functionality it returns.
The endpoint is live and returns a valid x402 challenge (HTTP 402) with version 1 of the protocol. The payment timeout is 300 seconds. Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the endpoint actually returns beyond its generic title.
Capabilities
Use cases
- —Programmatic access to a premium API resource without needing API keys or subscriptions
- —Agent-driven workflows that pay per call using USDC on Base
- —Testing x402 payment protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment flows
- —AI agents that need keyless, pay-as-you-go API access
- —Low-cost per-request API consumption settled on Base
Not for
- —Users who need detailed documentation or OpenAPI specs before integrating
- —High-volume use cases where $0.02/request adds up without bulk discounts
- —Anyone needing clarity on exactly what data the endpoint returns
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/213 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint's actual functionality beyond 'Premium API Access' is unknown. The docs pages are empty stubs. This is effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content
- —The specific functionality of /api/v1/charges/213 is unclear; 'Premium API Access' is a generic label
- —No OpenAPI schema or request/response examples are provided
- —No information on what data or service is returned after payment
Citations
- —Endpoint returns HTTP 402 with x402 version 1 challenge requiring USDC payment on Basehttps://lowpaymentfee.com/api/v1/charges/213
- —maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02https://lowpaymentfee.com/api/v1/charges/213
- —Platform lists APIs at $0.02/request across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Site advertises no API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com