Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four categories: 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, paid in USDC on the Base network via the x402 protocol.
The specific endpoint at `/api/v1/orders/79` is listed as "Premium API Access" and advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made by including an X-PAYMENT header with each request — no API keys, accounts, or rate limits are required. The x402 challenge specifies the "exact" payment scheme with a 300-second timeout.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The actual functionality behind the "Premium API Access" label on `/api/v1/orders/79` is unclear — it may be a generic order resource or a demonstration endpoint. Without documentation, the precise input format and response structure cannot be confirmed.
Capabilities
Use cases
- —Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys
- —Fetching real-time financial data like token quotes, gas estimates, and exchange rates with per-call payment
- —Running geocoding, validation, or data conversion tasks with no subscription commitment
- —Programmatic data export and analytics without account setup
Fit
Best for
- —AI agents needing keyless, pay-per-use API access on Base
- —Developers who want to avoid subscription commitments for occasional API calls
- —Web3-native applications that can settle payments in USDC on Base
Not for
- —High-volume production workloads where per-request pricing at $0.02 adds up quickly
- —Users who need detailed API documentation, SLAs, or guaranteed uptime
- —Applications that cannot handle x402 payment flows or USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/orders/79 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The specific purpose of /api/v1/orders/79 ('Premium API Access') is vague and undocumented.
Warnings
- —No API documentation available — all doc pages return only 'Connect wallet' with no content
- —No OpenAPI or JSON schema provided for any endpoint
- —The specific function of /api/v1/orders/79 is unclear; 'Premium API Access' is a generic label
- —No request or response examples available to verify actual endpoint behavior
- —The breadth of advertised capabilities (AI, finance, geocoding, etc.) cannot be verified without documentation
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, on Base networkhttps://lowpaymentfee.com
- —Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/orders/79
- —Payment scheme is 'exact' with 300-second timeouthttps://lowpaymentfee.com/api/v1/orders/79