Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/169` is listed as "Premium API Access" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers attach an X-PAYMENT header with a signed USDC payment on Base.
The broader platform advertises four endpoint 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 listed endpoints share the same $0.02/request pricing.
Important caveat: the `/api/v1/inbox/169` path does not clearly map to any of the named endpoints on the landing page. Its actual functionality is unknown — the description is simply "Premium API Access" with no further documentation, input schema, or example responses available. The platform's documentation pages (/api, /pricing, /README) all returned only a "Connect wallet" prompt with no substantive content. Prospective callers should test the endpoint to determine what it actually returns before relying on it in production.
Capabilities
Use cases
- —Programmatic access to paid API endpoints without account registration
- —Agent-driven API consumption with per-call USDC micropayments on Base
- —Testing x402 protocol integrations against a live endpoint
Fit
Best for
- —Developers or agents wanting zero-signup, pay-as-you-go API access
- —x402 protocol experimentation and integration testing
- —Low-volume callers who prefer per-request billing over subscriptions
Not for
- —Users needing detailed API documentation or guaranteed SLAs before purchasing
- —High-volume production workloads where $0.02/request adds up significantly
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/inbox/169 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, no examples, and the endpoint path '/api/v1/inbox/169' does not correspond to any named service on the landing page. Functionality is entirely unknown.
Warnings
- —The endpoint path /api/v1/inbox/169 does not match any documented API on the landing page — its actual functionality is unknown.
- —No input schema, output schema, or example responses are available.
- —All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no content.
- —The platform lists many endpoint categories but provides no technical documentation for any of them.
Citations
- —The endpoint returns a 402 x402 challenge requesting up to 20,000 base units of USDC (asset 0x8335…) on Base network.https://lowpaymentfee.com/api/v1/inbox/169
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —Four endpoint categories are listed: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.https://lowpaymentfee.com
- —Documentation pages /api, /pricing, and /README returned only a 'Connect wallet' prompt.https://lowpaymentfee.com/api