Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that provides a broad collection of endpoints across four categories: Data & Analytics (metrics, reports, 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, payable in USDC on the Base network via the x402 protocol.
The specific endpoint `/api/v1/messages/188` is listed as "Premium API Access" and carries a maximum charge of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). Payment is made by including an X-PAYMENT header; no API keys, rate limits, or upfront commitments are required. The x402 challenge confirms the endpoint is live, accepts POST requests, and settles payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base.
Documentation is minimal — the crawled pages beyond the landing page returned only "Connect wallet" prompts with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the `/messages/188` endpoint actually returns. The landing page lists many endpoints but provides no detailed descriptions of input parameters or output formats for any of them. Prospective users should be aware that the actual functionality behind this specific endpoint is unclear from available materials.
Capabilities
Use cases
- —Accessing premium API content with per-request USDC micropayments on Base
- —Agent-driven workflows that need keyless, pay-as-you-go API access
- —Exploring x402 protocol integrations for automated crypto payments
Fit
Best for
- —Developers experimenting with x402 pay-per-call patterns
- —Agents that need keyless API access settled in USDC on Base
- —Low-volume consumers who prefer no subscriptions or commitments
Not for
- —Users who need detailed API documentation or guaranteed SLAs before purchasing
- —High-volume consumers who would benefit from bulk pricing or subscription plans
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/188 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"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 request/response schema, no documentation of what /messages/188 actually does, and no examples. The listing is effectively a stub with only the x402 challenge and a landing page to go on.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The actual functionality of /api/v1/messages/188 is undocumented — 'Premium API Access' is the only description
- —No request body schema or response format documented anywhere in crawled materials
- —All non-landing crawled pages returned only 'Connect wallet' with no useful content
Citations
- —All endpoints priced at $0.02 per request with no API keys, rate limits, or commitmentshttps://lowpaymentfee.com
- —Endpoint accepts POST, charges max 20000 base units USDC (0.02 USD) on Base network via x402https://lowpaymentfee.com/api/v1/messages/188
- —Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, asset is USDC at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/messages/188
- —Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com