x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is a collection of pay-per-call API endpoints gated by the x402 protocol, settling payments in USDC on the Base network. The specific endpoint `/api/v1/nfts/7` is listed as "Premium API Access" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader platform offers endpoints across 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 endpoints are priced at $0.02 per request.
The specific functionality of the `/api/v1/nfts/7` endpoint is not documented beyond the label "Premium API Access" and the MIME type `application/json`. There is no OpenAPI schema, no request/response examples, and the crawled documentation pages (pricing, README, API) returned only a "Connect wallet" prompt with no additional content. The endpoint is confirmed live via a valid 402 challenge, but the actual data it returns remains unknown.
Capabilities
Use cases
- —Accessing NFT-related data via a single micropayment without account registration
- —Programmatic pay-per-call access to analytics, AI, finance, or utility endpoints
- —Agent-driven API consumption where x402 payment headers replace API keys
Fit
Best for
- —Developers who want keyless, pay-as-you-go API access settled on Base
- —AI agents that can autonomously pay for API calls via x402
- —Users who need low-cost per-request pricing without subscriptions
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/7 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but there is zero documentation on what the /api/v1/nfts/7 endpoint actually returns. No OpenAPI schema, no request/response examples, and all doc pages are empty beyond a wallet-connect prompt. The listing is effectively a stub.
Warnings
- —No documentation available for /api/v1/nfts/7 — the actual request format and response payload are unknown.
- —All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no useful content.
- —No OpenAPI or schema definition is provided for any endpoint on the platform.
- —The label 'Premium API Access' is generic and does not describe the endpoint's function.
Citations
- —The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/nfts/7
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/nfts/7
- —All endpoints priced at $0.02/request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com