Pay-per-request API platform on Base via x402 — analytics, AI, finance, and utility endpoints at $0.02/call.
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 infrastructure utilities. All endpoints are paid per-request using USDC on the Base network via the x402 protocol, with no API keys, no rate limits, and no subscriptions required.
The specific endpoint at `/api/v1/orders/70` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms a uniform $0.02/request pricing across all listed endpoints.
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. However, documentation pages (docs, pricing, README) returned only a "Connect wallet" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain unverified. The `/api/v1/orders/70` endpoint itself is live, returning a proper 402 challenge, but what data it returns upon payment is not documented.
Capabilities
Use cases
- —Accessing premium API data without creating an account or managing API keys
- —Making one-off paid API calls from an AI agent using x402 on Base
- —Programmatic access to analytics, AI inference, or financial data with per-request billing
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go API access
- —AI agents that can settle x402 payments in USDC on Base
- —Users who need occasional API calls without subscription commitments
Not for
- —High-volume users who need bulk pricing or enterprise SLAs
- —Users who need detailed API documentation and response schema guarantees
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/orders/70 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, and the landing page lists available endpoints with pricing. However, there is no OpenAPI schema, no documentation of request/response formats, and all doc pages return only 'Connect wallet' with no content. The specific purpose of /api/v1/orders/70 ('Premium API Access') is vague and undocumented.
Warnings
- —Documentation pages (/docs, /pricing, /README, /api) contain no substantive content — only a 'Connect wallet' prompt.
- —The endpoint path '/api/v1/orders/70' with description 'Premium API Access' is generic and its actual functionality is unknown.
- —No OpenAPI spec, no request/response schema, and no example payloads are available.
- —The broader platform lists many endpoint categories (AI, finance, analytics, utilities) but none have documented behavior or verified responses.
Citations
- —Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limitshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (= $0.02)https://lowpaymentfee.com/api/v1/orders/70
- —Platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilitieshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/orders/70