Pay-per-call API suite 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 collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. Every endpoint is priced at $0.02 per request, 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 at `/api/v1/messages/89` is listed as "Premium API Access." Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.
The broader platform advertises additional endpoints including 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 per-call price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found in the crawl. The `/api`, `/pricing`, and `/README` pages all returned only a "Connect wallet" prompt with no substantive content.
Capabilities
Use cases
- —Accessing AI inference (sentiment, summarization, classification, embeddings) without API key signup
- —Fetching real-time crypto prices, gas estimates, and exchange rates on a per-call basis
- —Running geocoding, validation, or data conversion tasks with instant pay-per-use billing
- —Exporting data or generating analytics reports with no subscription commitment
Fit
Best for
- —Agents and bots that need frictionless, keyless API access via x402
- —Developers prototyping with multiple API categories without managing subscriptions
- —Low-volume or bursty workloads where per-call pricing is more economical than monthly plans
Not for
- —High-volume production workloads where bulk/subscription pricing would be cheaper
- —Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/89 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>" \
-d '{"message": "hello"}'Example
Request
{
"message": "hello"
}Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documentation, no example responses, and the specific purpose of /api/v1/messages/89 is unclear beyond the generic label 'Premium API Access.' The /pricing, /README, and /api pages returned no useful content.
Warnings
- —No OpenAPI or schema documentation available for any endpoint
- —The specific function of /api/v1/messages/89 is unknown — 'Premium API Access' is a generic label
- —All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content
- —No example request or response payloads are documented anywhere in the crawl
- —The breadth of advertised endpoints (AI, finance, data, utils) could not be independently verified
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/messages/89
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform advertises endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/messages/89