x402-gated premium API access on Base, pay $0.02 per request in USDC.
What it does
lowpaymentfee.com hosts a collection of x402-protocol pay-per-call API endpoints on the Base network, settling payments in USDC. The specific endpoint at `/api/v1/policies/13` is listed as "Premium API Access" and returns a standard x402 challenge requiring up to 20,000 base units of USDC (i.e., $0.02) per request. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid payment proof.
The broader platform offers 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 priced at $0.02 per request.
However, the specific functionality behind `/api/v1/policies/13` is not documented beyond the label "Premium API Access." No OpenAPI schema, request/response examples, or detailed documentation were found. The docs, pricing, and API pages all returned only a "Connect wallet" prompt with no additional content. Callers should treat this as a low-information endpoint until the provider publishes more detail about what data or service is actually returned.
Capabilities
Use cases
- —Programmatic access to a premium API resource with per-call USDC micropayments
- —Agent-driven workflows that need keyless, on-demand API calls settled on Base
- —Testing x402 payment flows against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —AI agents that need keyless pay-per-call API access
- —Users who want to avoid subscriptions and pay only per request
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Anyone requiring free or fiat-only payment methods
- —Use cases needing high-throughput batch access (no documented bulk pricing)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/policies/13 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' at /policies/13 is completely undescribed. Docs pages returned only 'Connect wallet' with no content.
Warnings
- —The specific functionality of /api/v1/policies/13 ('Premium API Access') is not documented anywhere in the crawled material.
- —All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no usable content.
- —No OpenAPI spec or request/response schema is available.
- —The endpoint name is generic — it is unclear what data or service is returned after payment.
Citations
- —The endpoint returns a 402 challenge requiring up to 20,000 base units of USDC ($0.02) on Base network.https://lowpaymentfee.com/api/v1/policies/13
- —The platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network.https://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.https://lowpaymentfee.com/api/v1/policies/13
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.https://lowpaymentfee.com