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 infrastructure utilities. Every endpoint is priced at $0.02 per request, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.
The specific endpoint at `/api/v1/messages/101` 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 given USDC's 6 decimals. The payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
The broader platform advertises endpoints in 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 (geocoding, validation, conversion, generation). All share the same $0.02 per-request pricing. Documentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional technical detail. No OpenAPI spec, request/response schemas, or usage examples were found.
Capabilities
Use cases
- —Agent-driven AI inference (sentiment, summarization, classification, embeddings) with per-call crypto payment
- —Fetching real-time financial data such as token quotes, exchange rates, and gas estimates without API key management
- —On-demand geocoding, data validation, or format conversion from automated pipelines
- —Exporting analytics metrics and reports via pay-as-you-go requests
Fit
Best for
- —AI agents that need low-friction, keyless API access paid in USDC on Base
- —Developers prototyping with multiple utility endpoints at a flat $0.02/call
- —Web3-native applications that prefer on-chain settlement over subscription billing
Not for
- —High-volume production workloads where $0.02/request adds up quickly without bulk discounts
- —Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/101 \
-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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documented request/response schemas, no usage examples, and the /api, /pricing, and /README pages are all blank wallet-connect prompts. The purpose of the specific /messages/101 endpoint is unclear beyond the generic 'Premium API Access' label. Effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown
- —The /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no content
- —The specific purpose of /api/v1/messages/101 is not documented; 'Premium API Access' is generic
- —Example request JSON is inferred/guessed — no actual schema was provided by the endpoint
Citations
- —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 x402 challenge for /api/v1/messages/101 advertises maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeouthttps://lowpaymentfee.com/api/v1/messages/101
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/messages/101
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com