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 endpoint `/api/v1/charges/165` is one of many offered by the provider, which hosts a broad catalog of pay-per-call APIs spanning data & analytics, 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).
Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. The x402 challenge advertises a maxAmountRequired of 20000 base units, which at 6 decimals equals $0.02 per request — consistent with the site's stated flat pricing of $0.02/request across all endpoints. The provider advertises no API keys, no rate limits, and instant access.
However, the specific functionality of the `/api/v1/charges/165` endpoint is unclear. The description is simply "Premium API Access" with no further documentation, input schema, or output schema beyond the x402 challenge metadata. The docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no substantive content. Without knowing what this particular charge ID returns, agents should treat this as an opaque paid endpoint whose actual payload is unknown.
Capabilities
Use cases
- —Paying per-call for API access without needing an API key or subscription
- —Programmatic access to a premium endpoint settled in USDC on Base
- —Agent-driven API consumption with x402 payment protocol
Fit
Best for
- —Developers or agents wanting key-free, pay-per-use API access
- —x402-compatible clients on the Base network
- —Low-cost micropayment API calls at $0.02 each
Not for
- —Users who need detailed documentation or guaranteed SLAs before calling
- —Anyone without a Base-compatible USDC wallet
- —Use cases requiring known, well-documented input/output schemas
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/165 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, and the specific functionality of /api/v1/charges/165 is completely undocumented. The docs pages returned only wallet-connect prompts with no content.
Warnings
- —The specific functionality of /api/v1/charges/165 is unknown — 'Premium API Access' is the only description provided.
- —All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no substantive content.
- —No input or output schema is available; callers cannot know what to send or what to expect back.
- —The endpoint path '/api/v1/charges/165' does not match any of the advertised API paths on the homepage, so its purpose is unclear.
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/charges/165
- —The provider advertises $0.02/request flat pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/charges/165
- —The provider offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com