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 being listed here (`/api/v1/orders/10`) is described as "Premium API Access" and returns `application/json` via POST. Its on-chain challenge advertises a max amount of 20,000 base units of USDC (0x8335…on Base), which equals $0.02 given USDC's 6 decimals. This is consistent with the site-wide $0.02/request pricing.
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 — all at the same $0.02 price point. Documentation pages exist but appear to be behind a wallet-connect gate, so detailed request/response schemas are not publicly available. The endpoint is live and returning a valid 402 challenge.
Capabilities
Use cases
- —Accessing analytics metrics and reports without signing up for an account
- —Running AI inference (sentiment, summarization, classification, embeddings) on a per-call basis
- —Fetching real-time crypto token quotes and gas estimates
- —Geocoding addresses or validating data with zero setup
Fit
Best for
- —Developers who want instant API access without API key management
- —Agents that can settle payments in USDC on Base via x402
- —Low-volume or bursty workloads where per-request pricing is more economical than subscriptions
Not for
- —High-volume production workloads where bulk/subscription pricing would be cheaper
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/orders/10 \
-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 schema, no documented request/response format, and the docs pages are gated behind wallet-connect. The specific purpose of /api/v1/orders/10 ('Premium API Access') is vague and undocumented. Most details are inferred from the landing page catalog.
Warnings
- —The specific endpoint /api/v1/orders/10 has no documented request body schema or response format — its exact functionality is unclear.
- —Documentation, pricing, and README pages all appear gated behind a wallet-connect flow, providing no public content.
- —The site lists many endpoints but none have publicly visible detailed documentation or examples.
- —The relationship between /api/v1/orders/10 and the other listed endpoints (analytics, AI, finance, utils) is unclear.
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/orders/10
- —Available endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com