Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/products/22` is listed as "Premium API Access" and returns `application/json`. 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 endpoint accepts POST requests and is discoverable.
The broader platform advertises categories including: metrics and reports APIs, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation utilities. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages just show "Connect wallet"), so the actual behavior, request schemas, and response formats for each endpoint are unknown. The platform's value proposition centers on extremely low per-call pricing with zero onboarding friction.
Capabilities
Use cases
- —Accessing various utility and data APIs without creating an account or managing API keys
- —Making low-cost per-request API calls settled on-chain via USDC on Base
- —Integrating pay-as-you-go AI inference (sentiment, summarization, classification, embeddings) into agent workflows
Fit
Best for
- —Developers wanting zero-onboarding API access with crypto micropayments
- —AI agents that need frictionless, key-free API consumption via x402
- —Projects needing low-cost, on-demand API calls without subscription commitments
Not for
- —Users who need detailed API documentation and well-defined request/response schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscription plans
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/22 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, and all doc pages are empty stubs. The specific purpose of /api/v1/products/22 ('Premium API Access') is entirely opaque — there's no way to know what it returns without paying.
Warnings
- —No API documentation available — all doc, pricing, and API pages return only 'Connect wallet' with no content.
- —The purpose and response format of /api/v1/products/22 ('Premium API Access') is undocumented; it is unclear what data or service this endpoint provides.
- —No OpenAPI or schema definition is available for any endpoint on the platform.
- —The broad catalog of advertised endpoints (AI, finance, utils, etc.) cannot be verified from the crawl — they may be stubs or placeholders.
Citations
- —All endpoints are priced at $0.02 per request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —The x402 challenge for /api/v1/products/22 advertises maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/products/22
- —Platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages (/docs, /api, /pricing, /README) contain no substantive contenthttps://lowpaymentfee.com/docs