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 at `/api/v1/transactions/60` is labeled "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 x402 payment header to each request.
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/request price point. However, the specific functionality of the `/api/v1/transactions/60` endpoint is not documented beyond its "Premium API Access" label, and the crawled documentation pages returned only a wallet-connect prompt with no further detail.
Payments settle on the Base L2 network to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The endpoint accepts POST requests and returns `application/json`. The x402 challenge was successfully captured, confirming the endpoint is live.
Capabilities
Use cases
- —Programmatic access to premium API data without needing an account or API key
- —Agent-driven workflows that pay per request using USDC on Base
- —Accessing transaction-related data via a single HTTP POST call
Fit
Best for
- —Developers or agents wanting zero-signup, pay-as-you-go API access
- —Use cases requiring low-cost per-request pricing ($0.02)
- —Crypto-native applications already operating on the Base network
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Applications requiring free or subscription-based pricing models
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/60 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the specific endpoint's functionality is undocumented. No OpenAPI schema, no request/response examples, and all documentation pages returned only a wallet-connect stub. The endpoint's purpose beyond the generic 'Premium API Access' label is unknown.
Warnings
- —The exact functionality of /api/v1/transactions/60 is not documented — 'Premium API Access' is the only description available.
- —All documentation, pricing, and README pages returned only a 'Connect wallet' prompt with no usable content.
- —No OpenAPI spec, request schema, or response schema is available.
- —The platform lists many API categories (AI, finance, data, infrastructure) but none have detailed docs — actual capabilities are unverified.
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC on Base at 20000 base unitshttps://lowpaymentfee.com/api/v1/transactions/60
- —Platform lists $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and payTo is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3https://lowpaymentfee.com/api/v1/transactions/60