x402 pay-per-call API platform on Base with $0.02 USDC requests across data, AI, finance, and utility endpoints.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-call endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/nfts/40` is listed as "Premium API Access" and costs $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact-payment scheme — no API keys, accounts, or rate limits are required. Callers simply attach an X-PAYMENT header with a valid payment proof.
The broader platform advertises endpoints spanning 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 listed endpoints share the same $0.02/request pricing.
The specific functionality behind `/api/v1/nfts/40` is not documented — the path suggests NFT-related data (possibly metadata or details for NFT ID 40), but no schema, example request, or example response is available. The endpoint accepts POST requests and returns `application/json`. Payments are sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base, with a maximum timeout of 300 seconds.
Capabilities
Use cases
- —Fetching NFT-related data without needing an API key or account
- —Programmatic access to NFT information with per-call USDC micropayments
- —Agent-driven workflows that need on-demand NFT data with crypto settlement
Fit
Best for
- —Developers or agents wanting keyless, pay-as-you-go NFT data access
- —Crypto-native applications already operating on Base with USDC
- —Low-volume or sporadic API consumers who don't want subscriptions
Not for
- —High-volume consumers needing bulk NFT data at lower per-call cost
- —Users without USDC on Base or unfamiliar with x402 payment flows
- —Anyone needing detailed API documentation or guaranteed SLAs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/40 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no documentation for what /api/v1/nfts/40 actually returns, no request/response schema, no examples, and the crawled pages beyond the homepage are empty wallet-connect stubs. The specific NFT endpoint isn't even listed on the homepage catalog.
Warnings
- —No documentation exists for the /api/v1/nfts/40 endpoint — its purpose and response format are unknown
- —The endpoint path is not listed among the advertised APIs on the homepage, raising questions about its status
- —No OpenAPI spec, request schema, or response schema is available
- —Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content
Citations
- —The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/nfts/40
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/nfts/40
- —All listed endpoints cost $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 & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com