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/185` is listed as "Premium API Access" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys 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 priced at $0.02 per request.
However, the specific endpoint being listed here (`/api/v1/transfers/185`) is labeled only as "Premium API Access" with no further documentation about what data or functionality it returns. The docs, pricing, and README pages on the site all render only a "Connect wallet" prompt with no additional content. Without schema details or response examples, the actual behavior of this endpoint remains unclear.
Capabilities
Use cases
- —Accessing premium API data with per-request USDC micropayments on Base
- —Agent-driven workflows that need keyless, pay-as-you-go API access
- —Programmatic transfers or data retrieval without subscription commitments
Fit
Best for
- —Developers who want to pay per request without API key management
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer crypto-native micropayment access to APIs
Not for
- —Users who need detailed API documentation or response schemas before integrating
- —High-volume use cases where per-request pricing may add up compared to subscriptions
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/185 \
-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 it accepts USDC on Base at $0.02/request. However, there is no documentation for what this specific endpoint does, no input/output schema, no example responses, and the site's docs/pricing/README pages are empty beyond a wallet-connect prompt. The endpoint name 'Premium API Access' is generic and uninformative.
Warnings
- —No documentation available for the specific endpoint /api/v1/transfers/185 — its purpose and response format are unknown
- —All documentation pages (docs, pricing, README) render only 'Connect wallet' with no content
- —No OpenAPI spec, input schema, or output schema provided
- —The endpoint path '/api/v1/transfers/185' with a numeric ID suggests it may be a specific resource rather than a general-purpose API
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/transfers/185
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transfers/185