Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.
The specific endpoint at `/api/v1/transactions/40` 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 call (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02/request pricing model across all listed endpoints.
Other endpoints on the same platform include sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point. Documentation pages beyond the landing page returned only a "Connect wallet" prompt with no additional technical detail, so the actual request/response schemas for this specific endpoint are unknown.
Capabilities
Use cases
- —Agents that need on-demand access to analytics, AI, or financial data without managing API keys
- —Paying per-call for sentiment analysis, summarization, or text classification
- —Fetching real-time crypto gas estimates or token quotes via micropayment
- —Geocoding or data validation without a subscription commitment
Fit
Best for
- —AI agents needing keyless, pay-as-you-go API access
- —Developers prototyping with multiple utility endpoints at low cost
- —x402-compatible wallets and agent frameworks on Base
Not for
- —High-volume production workloads where $0.02/request adds up quickly
- —Users who need detailed API documentation or guaranteed SLAs
- —Applications requiring non-USDC or non-Base payment rails
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/40 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of this specific '/transactions/40' endpoint is entirely opaque beyond the generic 'Premium API Access' label. All doc pages returned only 'Connect wallet' with no content.
Warnings
- —No documentation available — all doc/pricing/API pages return only 'Connect wallet' with no technical content
- —The specific purpose and request/response schema of /api/v1/transactions/40 are unknown
- —No OpenAPI spec or ai-plugin manifest found
- —The endpoint name 'Premium API Access' is generic and does not describe actual functionality
Citations
- —Flat $0.02/request pricing, no API keys, no rate limits, Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired 20000 USDC base units (=$0.02) on Basehttps://lowpaymentfee.com/api/v1/transactions/40
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transactions/40
- —Available endpoint categories include Data & Analytics, AI & ML, Finance & Web3, Infrastructurehttps://lowpaymentfee.com