Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network. The platform uses the x402 payment protocol, meaning callers attach a payment header to each request rather than managing API keys, subscriptions, or rate limits.
The specific endpoint at `/api/v1/accounts/172` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
The broader platform advertises additional endpoints including 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 per-call price point. Documentation pages beyond the landing page returned only a "Connect wallet" prompt with no further technical detail, so the exact request/response schemas for this endpoint and others are unknown.
Capabilities
Use cases
- —Accessing premium API data without managing API keys or subscriptions
- —Making one-off paid API calls from autonomous agents via x402
- —Integrating low-cost per-request API access into workflows on Base network
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle payments via x402 on Base
- —Projects needing low-cost API calls without rate limits or signup
Not for
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —Applications requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/172 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond the landing page, no request/response examples, and the purpose of the /api/v1/accounts/172 endpoint specifically is entirely opaque. The docs, pricing, API, and README pages all returned only 'Connect wallet' with no useful content.
Warnings
- —No OpenAPI or schema documentation available for any endpoint
- —The specific purpose and expected input/output of /api/v1/accounts/172 is unknown — 'Premium API Access' is the only description
- —All documentation pages beyond the landing page returned only 'Connect wallet' with no technical content
- —The platform lists many endpoint categories (AI, finance, utils) but none could be verified for actual functionality
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limitshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/accounts/172
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com