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/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/charges/364` is listed as "Premium API Access" and requires a maximum of 20,000 base units of USDC (i.e., $0.02, since USDC has 6 decimals) per call. The x402 challenge confirms the endpoint is live, accepts the `exact` payment scheme, and responds with `application/json`. The payment is directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a 300-second timeout.
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 — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages only show a "Connect wallet" prompt), so the actual request/response schemas for individual endpoints are unknown. Without OpenAPI specs or example payloads, integrators will need to experiment or contact the provider to understand input/output formats.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without subscriptions
- —Fetching real-time financial data like token quotes, exchange rates, and gas estimates
- —Running utility operations like geocoding, validation, and data conversion on a per-call basis
- —Exporting data or generating analytics reports with per-request billing
Fit
Best for
- —Agents or developers who want zero-commitment, pay-as-you-go API access
- —Use cases requiring low-cost micropayments per API call ($0.02)
- —Crypto-native workflows already operating on the Base network
Not for
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —High-volume use cases where per-request pricing may add up compared to subscription plans
- —Developers without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/364 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The specific purpose of the /charges/364 endpoint beyond 'Premium API Access' is unclear.
Warnings
- —No OpenAPI or schema documentation available — all doc pages return only a 'Connect wallet' prompt
- —The specific functionality of /api/v1/charges/364 ('Premium API Access') is not described anywhere
- —Request and response formats are completely undocumented; integration requires guesswork
- —The platform lists many endpoints on its landing page but none have documented input/output schemas
Citations
- —All endpoints are priced at $0.02 per request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —The x402 challenge for /api/v1/charges/364 requires maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/charges/364
- —Payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeouthttps://lowpaymentfee.com/api/v1/charges/364
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/charges/364