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 at `/api/v1/charges/70` is one of many endpoints offered by the provider, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.
The x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base). The `maxAmountRequired` is 20000 base units, which at 6 decimals equals $0.02. The payment scheme is "exact," meaning the caller pays the precise amount per request. Timeout is 300 seconds.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. The specific functionality behind `/api/v1/charges/70` is not documented; it is labeled only as "Premium API Access" without details on input parameters, expected output, or what data or service it returns. The broader site lists endpoints for metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation, but none of these map directly to the `/charges/70` path. Prospective users should be aware that the actual behavior of this specific endpoint is unclear.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint without subscription or API key management
- —Agent-driven workflows that need on-demand, pay-as-you-go API calls settled in USDC on Base
- —Testing x402 payment protocol integrations with a low-cost live endpoint
Fit
Best for
- —Developers exploring x402 payment-gated APIs
- —AI agents that can settle USDC payments on Base per-call
- —Users who want zero-commitment, no-signup API access
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Anyone without a Base-compatible USDC wallet
- —High-volume use cases where $0.02/request adds up without bulk discounts
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/70 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation on what the endpoint actually does, no input/output schema, no examples, and the docs pages are empty. The specific path /api/v1/charges/70 does not correspond to any documented endpoint on the site.
Warnings
- —The specific endpoint /api/v1/charges/70 is not listed among the provider's documented APIs — its actual functionality is unknown.
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content.
- —No input parameters or output schema are documented for this endpoint.
- —No OpenAPI spec or machine-readable schema is available.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/charges/70
- —All endpoints are priced at $0.02 per request with no API keys, rate limits, or commitmentshttps://lowpaymentfee.com
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/charges/70
- —The provider lists endpoints for analytics, AI, finance, and infrastructure categorieshttps://lowpaymentfee.com