x402-gated Premium API Access on Base, pay $0.02 per request 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/159` accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). Payment is settled on-chain to the payTo address with a 300-second timeout window.
The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics (metrics, reports, data export, insights), AI & ML (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per request. No API keys, no rate limits, and no minimum commitments are required; access is instant via the x402 payment protocol.
However, the specific functionality behind `/api/v1/charges/159` is not documented beyond the label "Premium API Access." There is no OpenAPI schema, no request/response examples, and the docs, pricing, and README pages all render only a "Connect wallet" prompt with no further content. Without knowing what this particular charge endpoint actually returns, callers should treat this as an opaque paid endpoint until more documentation surfaces.
Capabilities
Use cases
- —Paying per-request for API access without needing API keys or subscriptions
- —Programmatic agent-driven access to a paid endpoint using x402 USDC payments on Base
- —Testing x402 protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers exploring x402 payment protocol integration
- —Agents that need keyless, pay-as-you-go API access on Base
- —Low-cost per-call API consumption without rate limits
Not for
- —Users who need detailed documentation or guaranteed SLAs before calling
- —Anyone looking for a specific, well-documented API capability (the actual response payload is undocumented)
- —High-volume use cases where $0.02/request adds up without clear value
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/159 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation of what the endpoint actually returns, no OpenAPI schema, no request/response examples, and the docs pages are empty beyond a wallet-connect prompt. The specific purpose of /api/v1/charges/159 is unknown.
Warnings
- —No documentation exists for what this endpoint actually returns — the label 'Premium API Access' is the only description available.
- —Docs, pricing, README, and API pages all render only 'Connect wallet' with no usable content.
- —No OpenAPI or output schema provided; request body format is unknown.
- —The broader platform lists many API categories but it is unclear whether /api/v1/charges/159 maps to any of them.
Citations
- —The endpoint returns HTTP 402 with x402 version 1 challenge requiring USDC payment on Basehttps://lowpaymentfee.com/api/v1/charges/159
- —maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02https://lowpaymentfee.com/api/v1/charges/159
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Basehttps://lowpaymentfee.com
- —Docs, pricing, README, and API pages render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs