Pay-per-request API platform on Base network via x402 — $0.02/call in USDC, no API keys required.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept per-call payments in USDC on the Base network. The specific endpoint `/api/v1/products/75` is listed as "Premium API Access" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per request. No API keys, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader platform advertises multiple API categories including 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 listed at the same $0.02/request price point. However, the specific endpoint being listed here (`/api/v1/products/75`) is labeled generically as "Premium API Access" and does not appear in the site's public catalog of named endpoints, so its exact functionality is unclear.
The endpoint accepts POST requests, returns `application/json`, and settles payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The x402 challenge specifies a 300-second payment timeout. Documentation pages beyond the landing page were largely empty (showing only "Connect wallet"), so detailed request/response schemas are unavailable.
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 a multi-category API platform
Fit
Best for
- —Developers or agents wanting zero-signup, pay-per-call API access
- —x402-compatible clients on the Base network
- —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 subscriptions
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/75 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/v1/products/75 is undocumented. No request/response schema, no examples, and docs pages are empty. The endpoint doesn't appear in the site's own catalog, making its purpose opaque.
Warnings
- —The endpoint /api/v1/products/75 is not listed in the site's public API catalog — its specific functionality is unknown.
- —Documentation pages (/docs, /api, /pricing, /README) returned no meaningful content beyond 'Connect wallet'.
- —No request body schema or response schema is available; callers must discover behavior empirically.
- —The platform appears to be a generic multi-category API marketplace; individual endpoint quality and data sources are unverified.
Citations
- —The x402 challenge requests maxAmountRequired of 20000 base units of USDC on Base (=$0.02)https://lowpaymentfee.com/api/v1/products/75
- —All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/products/75
- —Payment timeout is 300 secondshttps://lowpaymentfee.com/api/v1/products/75