Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Each call costs $0.02 in USDC on the Base network, settled on-chain with no API keys, rate limits, or upfront commitments.
The specific endpoint `/api/v1/item/16` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment scheme is "exact" and the asset contract is the canonical Base USDC address (0x8335…). The endpoint accepts HTTP POST and returns `application/json`.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 per request price point. However, documentation pages beyond the landing page returned only a "Connect wallet" prompt with no further technical detail, so request/response schemas for individual endpoints are unknown.
Capabilities
Use cases
- —Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys
- —Fetching real-time crypto token quotes or gas estimates with per-call payment
- —Geocoding or data validation as a utility service paid in USDC on Base
- —Exporting or analyzing data through analytics endpoints with no subscription
Fit
Best for
- —AI agents with Base USDC wallets needing diverse utility endpoints
- —Developers who want zero-commitment, pay-as-you-go API access
- —Workflows requiring multiple endpoint types (AI, finance, geo) from a single provider
Not for
- —Users who need detailed API documentation or guaranteed SLAs — docs are currently minimal
- —High-volume production workloads where $0.02/request adds up and bulk pricing would be preferred
- —Users without a crypto wallet or USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/item/16 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages beyond the landing page are empty ('Connect wallet' only). The purpose of `/api/v1/item/16` specifically is unclear — it is labeled generically as 'Premium API Access' with no further detail. This is effectively a stub listing.
Warnings
- —No API documentation available — all doc pages return only 'Connect wallet' with no technical content
- —The specific endpoint /api/v1/item/16 has no description beyond 'Premium API Access'; its actual functionality is unknown
- —No request or response schemas are provided for any endpoint on the platform
- —The platform lists many endpoint categories but it is unclear whether all are fully functional
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)https://lowpaymentfee.com/api/v1/item/16
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs