x402 pay-per-call API platform on Base with $0.02 USDC requests — no keys, no rate limits.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-call endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility/infrastructure services. Every request costs $0.02 in USDC on the Base network, settled via the x402 exact-payment scheme. No API keys or accounts are required; callers simply attach an X-PAYMENT header with a valid payment proof.
The specific endpoint `/api/v1/nfts/62` is listed as "Premium API Access." Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. Beyond the generic label, no further documentation describes what data this particular NFT endpoint returns — it may serve NFT metadata, ownership info, or related analytics, but this is unconfirmed.
The broader platform advertises categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. The site emphasizes simplicity: no API keys, no rate limits, no minimums, and instant access via the Base network.
Capabilities
Use cases
- —Fetching NFT-related data without needing an API key or account
- —Programmatic access to various data/analytics endpoints with per-call crypto payments
- —Agent-driven workflows that need instant, keyless API access settled on Base
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing low-cost ($0.02) per-request data endpoints
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone unable to pay with USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/62 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no documentation for what /api/v1/nfts/62 actually returns, no OpenAPI schema, no example request/response, and the crawled pages beyond the homepage are empty. The endpoint's purpose is essentially unknown beyond the generic 'Premium API Access' label.
Warnings
- —No documentation exists for the /api/v1/nfts/62 endpoint — its actual response payload is unknown.
- —No OpenAPI spec or schema is available for any endpoint on the platform.
- —The 'Premium API Access' label is generic and does not describe the endpoint's function.
- —Most crawled pages (api, pricing, README) returned only a 'Connect wallet' prompt with no useful content.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/nfts/62
- —All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com