x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.
What it does
lowpaymentfee.com is a collection of x402-protocol pay-per-call API endpoints hosted on the Base network. The specific endpoint `/api/v1/benefits/75` is listed as "Premium API Access" and returns a 402 challenge requesting payment in USDC (contract 0x8335…2913 on Base). The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. Payment is made via the x402 exact scheme with no API keys or rate limits required.
The broader lowpaymentfee.com platform advertises endpoints 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 uniformly priced at $0.02 per request.
The `/api/v1/benefits/75` endpoint itself does not have detailed documentation beyond the title "Premium API Access." There is no OpenAPI schema, no request/response examples, and the crawled docs, pricing, and API pages all returned only a "Connect wallet" prompt with no additional content. The exact functionality behind this specific endpoint path is unclear — it may be a generic or placeholder route. Agents should be aware that the actual response payload and input parameters are undocumented.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint 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 pay-per-call protocols
- —AI agents that need keyless, on-demand API access settled in crypto
- —Low-volume or sporadic API consumers who prefer pay-as-you-go pricing
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/benefits/75 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond the endpoint title. The crawled docs/pricing/API pages are empty (wallet-connect only). The actual functionality of /api/v1/benefits/75 is entirely undocumented, making this effectively a stub listing.
Warnings
- —No documentation available for this specific endpoint — functionality is unknown
- —No OpenAPI or input/output schema provided
- —Docs, pricing, API, and README pages all render only a 'Connect wallet' prompt with no useful content
- —The endpoint path '/api/v1/benefits/75' does not match any of the advertised API categories on the homepage
Citations
- —The endpoint returns a 402 challenge requesting 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/benefits/75
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/benefits/75
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com