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 across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Every request costs $0.02 in USDC on the Base network, settled on-chain with no API keys, no rate limits, and no upfront commitments.
The specific endpoint `/api/v1/nfts/48` is listed as "Premium API Access." Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is "exact" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.
The platform also exposes endpoints for 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. No OpenAPI schema or detailed documentation was found beyond the landing page catalog, so the exact request/response shapes for `/api/v1/nfts/48` are unknown.
Capabilities
Use cases
- —Agents that need on-demand NFT or crypto data without managing API keys
- —Programmatic access to AI inference (sentiment, summarization, classification) paid per call via USDC
- —Fetching real-time exchange rates or gas estimates with micropayments
- —Infrastructure utilities like geocoding or data validation without subscription overhead
Fit
Best for
- —AI agents and bots that can settle x402 payments autonomously
- —Developers who want zero-commitment, pay-as-you-go API access
- —Web3-native applications already operating on Base with USDC
Not for
- —High-volume production workloads where $0.02/request adds up significantly
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —Applications that cannot handle on-chain USDC payments on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/48 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation for request/response formats, and the purpose of /api/v1/nfts/48 specifically is entirely opaque beyond the generic label 'Premium API Access.' The crawled pages beyond the landing page returned only 'Connect wallet' with no useful content.
Warnings
- —No OpenAPI or schema documentation available for any endpoint
- —The specific purpose and expected input/output of /api/v1/nfts/48 is unknown — 'Premium API Access' is not descriptive
- —Crawled /api, /pricing, and /README pages returned no useful content (only 'Connect wallet')
- —The broad catalog of endpoints (AI, finance, analytics, etc.) all at identical $0.02 pricing with no documentation raises questions about actual functionality
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/nfts/48
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/nfts/48
- —All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com