Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transfers/82` is listed as "Premium API Access" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits 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 per request price point. Payments settle to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transfers/82` endpoint actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but the actual functionality behind the paywall is unknown.
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 with a low-cost endpoint
Fit
Best for
- —Developers exploring x402 payment protocol
- —Agents that need keyless, pay-per-call API access
- —Users who want to avoid subscriptions and pay only per request
Not for
- —Users who need detailed API documentation or schemas before purchasing
- —Anyone requiring non-crypto payment methods
- —High-volume use cases where $0.02/call adds up without volume discounts
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/82 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and no description of what the endpoint actually does beyond the generic label 'Premium API Access'. The docs pages are empty. Functionality behind the paywall is entirely unknown.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or schema describing request parameters or response format
- —The specific functionality of /api/v1/transfers/82 is unknown — 'Premium API Access' is not descriptive
- —No request or response examples available anywhere in crawled content
- —Cannot verify what data or service is actually delivered after payment
Citations
- —Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 USDC base units on Basehttps://lowpaymentfee.com/api/v1/transfers/82
- —Platform lists APIs at $0.02/request across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —No API keys, no rate limits, no commitments advertisedhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/transfers/82
- —Docs, API, pricing, and README pages render only 'Connect wallet' with no additional contenthttps://lowpaymentfee.com/docs