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 suite of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every request is paid per-call at $0.02 USDC on the Base network, with no API keys, no rate limits, and no subscription commitments. Payment is handled via the x402 protocol: callers attach an X-PAYMENT header with a signed USDC payment to the payTo address, and the endpoint returns the result.
The specific endpoint `/api/v1/nfts/3` is listed as "Premium API Access" and returns `application/json`. 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. No detailed input/output schema beyond the x402 challenge envelope is published, so the exact request body format and response structure for this NFT-related endpoint are unknown.
The broader platform advertises endpoints in 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 (geocoding, validation, conversion, generation). All share the same $0.02/request pricing model. Documentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional content.
Capabilities
Use cases
- —Fetching NFT-related data on a per-call basis without managing API keys
- —Agent-driven workflows that need on-demand paid API access settled in USDC on Base
- —Prototyping integrations against a low-cost, no-commitment API platform
Fit
Best for
- —Developers or agents wanting zero-setup, pay-as-you-go API access
- —x402-compatible wallets and agent frameworks on Base
- —Low-volume or bursty workloads where subscription pricing is wasteful
Not for
- —High-volume production workloads needing SLAs or guaranteed uptime documentation
- —Users who need detailed API documentation, schemas, or SDKs before integrating
- —Non-crypto users who cannot send USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/3 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no published OpenAPI schema, no request/response examples, and no documentation beyond a landing page. The specific purpose of /api/v1/nfts/3 is undocumented. This is effectively a stub listing.
Warnings
- —No API documentation available — /api, /pricing, and /README all return only a wallet-connect prompt with no content.
- —No input or output schema published for /api/v1/nfts/3; request body format is unknown.
- —The endpoint path suggests NFT data but the listing title is generic ('Premium API Access') with no further detail.
- —Platform appears to be a demonstration or early-stage project; reliability and data quality are unverified.
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The x402 challenge for /api/v1/nfts/3 shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.https://lowpaymentfee.com/api/v1/nfts/3
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com