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/273` 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 accounts required.
The broader lowpaymentfee.com platform advertises a suite of pay-per-call 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 with no rate limits or minimum commitments.
However, the specific endpoint `/api/v1/charges/273` is labeled only as "Premium API Access" with no further documentation on what data or functionality it returns. The docs, pricing, and API pages on the site all render only a "Connect wallet" prompt with no additional technical detail. Without an OpenAPI schema, example responses, or detailed documentation, it is unclear what payload this particular endpoint produces. Agents should treat this as a generic x402-gated resource until more documentation becomes available.
Capabilities
Use cases
- —Programmatic access to a pay-per-call API without needing API keys or subscriptions
- —Agent-driven workflows that settle per-request payments in 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-call usage without rate limits or commitments
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —High-volume batch processing where per-call pricing may add up
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/273 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (returns 402 with a valid x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no example request/response, and the docs pages are empty beyond a wallet-connect prompt. The specific functionality of /api/v1/charges/273 is undocumented, making this effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, and API pages only show 'Connect wallet'
- —The specific functionality of /api/v1/charges/273 ('Premium API Access') is not described anywhere
- —No OpenAPI schema or example responses provided
- —No input schema documented — unclear what POST body is expected
Citations
- —Endpoint returns 402 with x402 challenge accepting USDC on Base network at maxAmountRequired 20000 base unitshttps://lowpaymentfee.com/api/v1/charges/273
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/charges/273
- —All listed APIs priced at $0.02/request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com