Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general-purpose utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no sign-up — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/messages/72` is listed as "Premium API Access" and follows the same x402 payment pattern. Its exact functionality is not documented beyond the generic title; it accepts HTTP POST and returns `application/json`. The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.
Payment is handled via the x402 "exact" scheme: the caller must pay up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout window.
Capabilities
Use cases
- —Agent-driven data retrieval without API key management
- —On-demand AI inference (sentiment, summarization, classification, embeddings) at micro-payment scale
- —Fetching real-time crypto quotes, gas estimates, and exchange rates
- —Geocoding and data validation as lightweight utility calls
- —Exporting analytics reports with per-request billing
Fit
Best for
- —AI agents that need keyless, pay-as-you-go API access
- —Developers prototyping with low-cost, no-commitment endpoints
- —Web3-native applications already holding USDC on Base
Not for
- —High-volume production workloads needing guaranteed SLAs or rate-limit documentation
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —Callers without USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/72 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, no documentation for what /api/v1/messages/72 actually does, and the crawled pages beyond the homepage returned only 'Connect wallet' with no useful content. The listing is essentially a stub with known pricing.
Warnings
- —The specific endpoint /api/v1/messages/72 has no documentation — its purpose ('Premium API Access') is a generic label with no details on expected input or output.
- —No OpenAPI spec, no request/response examples, and no detailed docs were found anywhere on the site.
- —Pages at /api, /pricing, and /README all returned only 'Connect wallet' with no substantive content.
- —The broader platform lists many endpoints but none have documented schemas or sample payloads.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/messages/72
- —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 platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/messages/72