Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/policies/91` is listed as "Premium API Access" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC, which is 6-decimal, equaling $0.02). No API keys, rate limits, or subscriptions are required — each call is paid individually via an X-PAYMENT header.
The broader 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 listed at the same $0.02 per request price point and settle payments in USDC on the Base L2 network.
The specific functionality behind `/api/v1/policies/91` is not documented beyond the label "Premium API Access." The docs, pricing, and API pages all returned only a "Connect wallet" prompt with no further technical documentation, OpenAPI schema, or usage examples. Without additional documentation it is unclear what data or service this particular endpoint returns when a valid payment is submitted.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint with per-request USDC micropayments
- —Agent-driven workflows that need keyless, pay-as-you-go API access on Base
- —Exploring x402 protocol integration for crypto-native API consumption
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that can settle USDC on Base for per-call API access
- —Low-volume consumers who prefer pay-per-use over subscriptions
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/policies/91 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' is completely undocumented. The docs/pricing/API pages all render only a wallet-connect prompt with no useful content.
Warnings
- —The specific functionality of /api/v1/policies/91 ('Premium API Access') is entirely undocumented — it is unclear what data or service it provides.
- —All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no technical content.
- —No OpenAPI schema, request format, or response examples are available.
- —The platform lists many endpoint categories (AI, finance, analytics, infrastructure) but none have visible documentation to verify actual functionality.
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/policies/91
- —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
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/policies/91