Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.
The specific endpoint `/api/v1/transfers/127` is listed as "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is settled on-chain to the specified payTo address, with a 300-second timeout window.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation. However, documentation pages (docs, pricing, README) returned only a "Connect wallet" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain undocumented and unverifiable from the crawl material alone.
Capabilities
Use cases
- —Accessing premium API endpoints without traditional API key registration
- —Making one-off paid API calls settled in USDC on Base
- —Integrating pay-per-use services into agent workflows via x402 protocol
Fit
Best for
- —Developers wanting frictionless API access without signup or subscriptions
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing low-cost per-request pricing with no minimum commitments
Not for
- —Users who need detailed API documentation and response schemas before integrating
- —Applications requiring high-throughput bulk access at volume-discounted rates
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/127 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, and all doc pages return only 'Connect wallet' with no content. The specific purpose of '/api/v1/transfers/127' beyond 'Premium API Access' is unknown.
Warnings
- —No documentation available — all doc/pricing/README pages return only 'Connect wallet' with no substantive content.
- —The specific functionality of /api/v1/transfers/127 is undescribed; 'Premium API Access' is a generic label.
- —No request or response schemas are documented or inferrable from the crawl material.
- —The platform lists many endpoint categories (AI, finance, analytics, etc.) but none could be verified for actual functionality.
Citations
- —Endpoint returns HTTP 402 with x402 challenge requesting 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/transfers/127
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transfers/127
- —Documentation pages return only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs