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/88` is listed as "Premium API Access" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or rate limits are advertised; callers pay per request via the x402 protocol's X-PAYMENT header.
The 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 per-request pricing. The x402 challenge confirms the endpoint is live, accepts POST requests, and settles payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.
Note that the specific `/api/v1/inbox/88` endpoint's purpose is unclear — it does not correspond to any of the documented API categories on the landing page. No OpenAPI schema, request/response examples, or detailed documentation were found. The /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no substantive content.
Capabilities
Use cases
- —Programmatic access to a pay-per-call API without needing API keys or subscriptions
- —Agent-driven workflows that need on-demand endpoint access settled in USDC on Base
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers exploring x402 payment protocol
- —Agents needing keyless, pay-as-you-go API access on Base
- —Low-volume or sporadic API consumers who prefer per-call billing
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —High-volume consumers seeking bulk pricing or subscription discounts
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/inbox/88 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and confirms pricing and settlement details, but the specific endpoint (/api/v1/inbox/88) has no documentation, no schema, no request/response examples, and its purpose ('Premium API Access') is vague. Supporting pages returned only 'Connect wallet' with no useful content.
Warnings
- —The endpoint /api/v1/inbox/88 does not match any documented API path on the landing page; its actual functionality is unknown.
- —No OpenAPI schema, request examples, or response examples are available.
- —The /api, /pricing, and /README pages contain no documentation — only a 'Connect wallet' prompt.
- —The platform's advertised capabilities (AI, analytics, finance, etc.) could not be independently verified beyond the landing page listing.
Citations
- —The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request.https://lowpaymentfee.com
- —Pricing is $0.02 per request with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The x402 challenge shows maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base, paid to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.https://lowpaymentfee.com/api/v1/inbox/88