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, settled in USDC on the Base network.
The specific endpoint at `/api/v1/orders/43` is described as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys or rate limits required — callers simply attach an X-PAYMENT header to each request.
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 spec, no request/response schema documentation, and no examples of what the `/api/v1/orders/43` endpoint actually returns. The broader site lists many endpoints but provides no detail on input parameters or response formats for any of them.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without subscription commitments
- —Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis
- —Running data analytics queries and exporting data with pay-as-you-go pricing
- —Using utility services like geocoding and validation without API key management
Fit
Best for
- —Agents or developers who want instant, keyless API access with crypto micropayments
- —Low-volume or sporadic API consumers who don't want monthly subscriptions
- —x402-compatible agents that can settle payments in USDC on Base
Not for
- —High-volume consumers who need bulk pricing or rate guarantees
- —Users who require detailed API documentation, schemas, or SLAs before integration
- —Consumers who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/orders/43 \
-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 documentation of request/response schemas, no examples, and the specific purpose of the /api/v1/orders/43 endpoint is unclear beyond the generic label 'Premium API Access'. Most crawled pages returned only a wallet-connect prompt.
Warnings
- —No OpenAPI or schema documentation available for any endpoint
- —The specific purpose and expected input/output of /api/v1/orders/43 is undocumented
- —All non-homepage pages (docs, API, pricing, README) returned only 'Connect wallet' with no content
- —No request or response examples could be sourced
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —The x402 challenge for /api/v1/orders/43 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/orders/43
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com