Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to gate access to a variety of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Each call costs $0.02 in USDC on the Base network, with no API keys, rate limits, or upfront commitments required. Payment is handled inline via the x402 payment header.
The specific endpoint at `/api/v1/products/72` is listed as "Premium API Access" and returns `application/json`. The x402 challenge confirms it accepts POST requests and charges a maximum of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads are available from the crawled pages. The docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. The exact functionality behind the `/api/v1/products/72` path is unclear beyond its title.
Capabilities
Use cases
- —Accessing premium API data with per-request USDC micropayments on Base
- —Agent-driven API consumption without pre-registration or API keys
- —Programmatic pay-as-you-go access to various data and utility endpoints
Fit
Best for
- —Developers or agents wanting zero-signup, pay-per-call API access
- —x402-compatible wallets and agent frameworks on Base
- —Low-volume or sporadic API consumers who prefer no subscriptions
Not for
- —Users needing detailed API documentation or guaranteed SLAs
- —High-volume consumers who would benefit from bulk pricing or rate-limit guarantees
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/72 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI schema, no documentation beyond a landing page listing, no example request/response payloads, and the specific functionality of /api/v1/products/72 is undocumented. The docs/pricing/README pages are all empty (wallet-connect only).
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The exact functionality of /api/v1/products/72 ('Premium API Access') is not described anywhere in the crawled content
- —All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no useful content
- —No example request or response payloads are available
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/products/72
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/products/72
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com