Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. 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/orders/31` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equates to $0.02 per call, consistent with the site's advertised flat pricing. 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 technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The exact functionality behind this particular `/api/v1/orders/31` endpoint is unclear beyond its "Premium API Access" label.
Capabilities
Use cases
- —Accessing premium API data without creating an account or managing API keys
- —Making one-off API calls with instant USDC micropayments on Base
- —Integrating pay-as-you-go analytics, AI, or finance endpoints into agent workflows
Fit
Best for
- —Developers wanting zero-friction, keyless API access
- —AI agents that can settle x402 payments autonomously on Base
- —Low-volume or sporadic API consumers who prefer per-call pricing over subscriptions
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscription plans
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/orders/31 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of this specific endpoint (/api/v1/orders/31) is unclear. The listing is essentially a stub with confirmed liveness and pricing.
Warnings
- —No OpenAPI spec or request/response schema available
- —Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no technical content
- —The exact functionality of /api/v1/orders/31 ('Premium API Access') is undocumented — it is unclear what data or service it provides
- —The broad catalog of endpoints listed on the homepage cannot be verified for actual functionality
Citations
- —All endpoints are priced at $0.02 per request with no API keys, rate limits, or commitmentshttps://lowpaymentfee.com
- —The x402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equating to $0.02https://lowpaymentfee.com/api/v1/orders/31
- —Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeouthttps://lowpaymentfee.com/api/v1/orders/31
- —The platform advertises endpoints for analytics, AI/ML, finance, and utility serviceshttps://lowpaymentfee.com