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/56` 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. Documentation pages exist but appear gated behind a wallet connection, so detailed request/response schemas are not publicly available. The endpoint is confirmed live (402 challenge captured successfully).
Capabilities
Use cases
- —Accessing customer data records on a per-call basis without subscription commitments
- —Agent-driven workflows that need low-friction, keyless API access settled in crypto
- —Programmatic data retrieval where traditional API key management is undesirable
Fit
Best for
- —Developers or agents wanting instant, keyless API access via x402
- —Crypto-native applications that can pay per request in USDC on Base
- —Low-volume or bursty workloads where flat $0.02/call pricing is economical
Not for
- —High-volume production use cases where bulk pricing would be more cost-effective
- —Users who cannot transact in USDC on the Base network
- —Applications requiring detailed OpenAPI schemas or comprehensive documentation upfront
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/56 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 challenge and clear pricing. However, there is no OpenAPI schema, no documented request/response format, no examples, and the docs pages are gated behind wallet connection. The purpose of the '/customers/56' endpoint specifically is unclear beyond the generic 'Premium API Access' label.
Warnings
- —No OpenAPI or request/response schema available — the exact input format and response structure for /api/v1/customers/56 are unknown.
- —Documentation, pricing, and README pages all appear gated behind wallet connection and contain no useful content.
- —The specific purpose of the '/customers/56' endpoint is unclear; the name 'Premium API Access' is generic and may be a placeholder or demo endpoint.
- —The broader platform lists many endpoint categories but none have publicly visible documentation.
Citations
- —All endpoints 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/56
- —Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeouthttps://lowpaymentfee.com/api/v1/customers/56
- —Platform offers endpoints across data analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com