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/73` is listed as "Premium API Access" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader platform advertises multiple API categories including 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. However, the specific functionality behind the `/api/v1/policies/73` endpoint is not documented beyond its "Premium API Access" label, so the exact data or service it returns is unclear.
The endpoint is live and returns a proper 402 challenge with x402 version 1. It accepts POST requests and returns `application/json`. Payment is settled in USDC (contract `0x8335...2913`) on Base to address `0x1A2B...85F3` with a 300-second timeout. Documentation pages beyond the landing page appear to require wallet connection and provide no additional content.
Capabilities
Use cases
- —Accessing premium API data with per-request USDC micropayments on Base
- —Agent-driven API consumption without pre-registration or API keys
- —Programmatic pay-as-you-go access to various data and utility endpoints
Fit
Best for
- —Developers wanting zero-commitment, per-call API pricing
- —AI agents that can settle x402 payments autonomously
- —Users already holding USDC on the Base network
Not for
- —Users needing detailed documentation or OpenAPI specs before integrating
- —Anyone without USDC on Base or an x402-compatible payment client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/policies/73 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but the actual functionality behind /api/v1/policies/73 is undocumented. No OpenAPI spec, no request/response schema, and all docs pages beyond the landing page are empty (wallet-gated). The listing is essentially a stub with pricing info only.
Warnings
- —The specific functionality of /api/v1/policies/73 ('Premium API Access') is not documented — it is unclear what data or service it returns.
- —All documentation pages (/docs, /api, /pricing, /README) appear to require wallet connection and contain no readable content.
- —No OpenAPI spec or request/response schema is available.
- —No example responses are available to verify what the endpoint actually returns.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/policies/73
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/policies/73