Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Each call costs $0.02 in USDC on the Base network, settled on-chain with no API keys, rate limits, or subscriptions required.
The specific endpoint `/api/v1/item/17` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment scheme is "exact" and the asset is the canonical Base USDC contract (0x8335…2913). The endpoint accepts HTTP POST and returns application/json.
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/request price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show "Connect wallet"), so the actual request/response schemas for individual endpoints are unknown. Without documentation or example payloads, callers will need to experiment or inspect responses to understand the expected input and output formats.
Capabilities
Use cases
- —Accessing miscellaneous API services with per-call USDC micropayments on Base
- —Agent-driven workflows that need on-demand API access without pre-registration
- —Testing x402 payment flows against a live endpoint
Fit
Best for
- —Developers exploring x402 payment protocol integrations
- —Agents needing keyless, pay-as-you-go API access on Base
- —Low-volume callers who want no subscription or commitment
Not for
- —Production workloads requiring well-documented request/response schemas
- —High-throughput use cases where $0.02/call adds up significantly
- —Users who need fiat-only payment options
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/item/17 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but documentation is effectively nonexistent — every docs/pricing/README page just shows 'Connect wallet'. No request or response schemas are available, and the purpose of '/api/v1/item/17' specifically is unclear beyond the generic label 'Premium API Access'. The listing is essentially a stub.
Warnings
- —Documentation pages (/docs, /pricing, /README, /api) are all empty — only showing 'Connect wallet'
- —No request or response schema available for this endpoint
- —The specific function of /api/v1/item/17 is unclear; 'Premium API Access' is a generic label that doesn't describe what the endpoint actually does
- —The broader platform lists many endpoint categories but none have documented schemas
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base (scheme: exact)https://lowpaymentfee.com/api/v1/item/17
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/item/17
- —Platform pricing is $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com