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/transactions/177` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.
The broader platform offers endpoints across four 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 endpoints are uniformly priced at $0.02 per request.
However, the specific endpoint being listed here (`/api/v1/transactions/177`) does not clearly map to any of the documented API categories. Its description is simply "Premium API Access," and no documentation, request schema, or response schema is available for this particular path. The docs, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. Without further documentation it is unclear what data or functionality this specific transaction endpoint returns.
Capabilities
Use cases
- —Programmatic access to paid API endpoints without traditional API key registration
- —Agent-driven workflows that need to pay per call using USDC on Base
- —Testing x402 protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —AI agents that need keyless, pay-as-you-go API access
- —Low-cost per-request API consumption on Base L2
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —High-volume use cases where $0.02/request adds up significantly
- —Anyone needing clarity on what this specific endpoint actually returns
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/177 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific endpoint path '/api/v1/transactions/177' is not explained anywhere in the crawled content. The docs/pricing/README pages are all empty beyond a wallet connect prompt.
Warnings
- —No documentation available for this specific endpoint — its purpose and expected input/output are unknown
- —The path '/api/v1/transactions/177' does not match any of the documented API categories on the landing page
- —All documentation pages (docs, pricing, README) returned only 'Connect wallet' with no content
- —No OpenAPI spec, no request schema, no response schema available
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base networkhttps://lowpaymentfee.com/api/v1/transactions/177
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/transactions/177
- —Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com