x402 pay-per-call API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of pay-per-call 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, settled in USDC on the Base network.
The specific endpoint `/api/v1/nfts/10` is listed as "Premium API Access" but its exact functionality is not documented on the landing page. Based on the URL path, it likely returns NFT-related data (possibly for token ID 10), but this is inferred rather than confirmed. The x402 challenge for this endpoint shows a maxAmountRequired of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 — consistent with the site's uniform pricing.
The platform emphasizes simplicity: no API keys, no rate limits, no commitments, and instant access. Payment is handled via the x402 protocol with an "exact" scheme, meaning each request requires a one-time micropayment. The endpoint accepts POST requests and returns application/json. 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 metadata or data without needing an API key or subscription
- —Programmatic access to various data, AI, and finance endpoints via micropayments
- —Agent-driven workflows that need on-demand API access with per-call billing
Fit
Best for
- —Developers who want zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing low-cost API calls without rate limits or signup
Not for
- —High-volume use cases where $0.02/request adds up significantly compared to subscription APIs
- —Users who need detailed API documentation, SDKs, or OpenAPI specs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/10 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <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 documentation for the /api/v1/nfts/10 endpoint specifically — no request/response schema, no examples, and the landing page doesn't even list this NFT endpoint among its available APIs. The broader platform lists many endpoints but provides no OpenAPI spec or detailed docs.
Warnings
- —The /api/v1/nfts/10 endpoint is not listed among the available APIs on the landing page — its exact functionality is unknown.
- —No OpenAPI spec, request schema, or response schema is available for any endpoint.
- —The /api, /pricing, and /README pages all return only a wallet-connect prompt with no useful documentation.
- —The platform lists many endpoints (AI, analytics, finance, utils) but none have documented input/output schemas — actual functionality is 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/10 shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.https://lowpaymentfee.com/api/v1/nfts/10
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.https://lowpaymentfee.com