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, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/customers/26` is listed as "Premium API Access" and returns `application/json` via POST. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which has 6 decimals), equating to $0.02 per call. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 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 generation — all at the same $0.02 price point. However, documentation is extremely sparse: the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples available. The purpose and behavior of the `/api/v1/customers/26` endpoint specifically is unclear — it could be a demo or placeholder resource.
Capabilities
Use cases
- —Accessing premium data or customer records via a single paid API call without needing an account or API key
- —Integrating pay-per-use API endpoints into agent workflows that settle payments on Base in USDC
- —Prototyping x402 payment flows against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing keyless, pay-per-call API access on Base
- —Low-volume consumers who want no subscription commitments
Not for
- —Production workloads requiring detailed API documentation and SLAs
- —Users who need non-crypto payment methods
- —High-throughput use cases where per-request crypto settlement adds unacceptable latency
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/26 \
-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 there is zero documentation for request/response schemas, no OpenAPI spec, and the specific endpoint's purpose ('customers/26') is unexplained. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt.
Warnings
- —No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content
- —No OpenAPI or schema definition found; request and response formats are unknown
- —The specific endpoint /api/v1/customers/26 has no description beyond 'Premium API Access' — its actual functionality is unclear
- —The platform lists many endpoints on its homepage but none have documented input/output schemas
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equating to $0.02https://lowpaymentfee.com/api/v1/customers/26
- —Payment is sent to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeouthttps://lowpaymentfee.com/api/v1/customers/26
- —Platform offers endpoints across data analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com