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 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, payable in USDC on the Base network via the x402 protocol.
The specific endpoint at `/api/v1/messages/177` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The platform advertises no API keys, no rate limits, no minimums, and instant access — callers simply attach an x402 payment header to each request. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.
Documentation beyond the landing page is sparse: the /api, /pricing, and /README routes all return only a "Connect wallet" prompt with no further detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The exact functionality behind the `/api/v1/messages/177` path is unclear — it does not map to any of the named endpoints on the homepage. Callers should expect to experiment or contact the provider for specifics.
Capabilities
Use cases
- —Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time financial data like token quotes, exchange rates, or gas estimates with per-call billing
- —Geocoding, data validation, or format conversion as lightweight utility calls from automated workflows
Fit
Best for
- —AI agents needing keyless, pay-per-use API access on Base
- —Developers wanting low-friction micropayment APIs without subscriptions
- —Web3-native applications that already hold USDC on Base
Not for
- —High-volume batch workloads where $0.02/request adds up quickly
- —Users who need detailed API documentation or SLA guarantees before integrating
- —Callers without USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/177 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is no OpenAPI spec, no request/response schema, no usage examples, and the specific /messages/177 path is not documented on the homepage. The crawled /api, /pricing, and /README pages are empty. Effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available
- —The /api/v1/messages/177 path does not correspond to any named endpoint on the homepage — its exact functionality is unknown
- —All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no content
- —No request or response examples are available; callers must experiment
Citations
- —Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/requesthttps://lowpaymentfee.com
- —Advertises no API keys, no rate limits, no minimums, instant access, Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Basehttps://lowpaymentfee.com/api/v1/messages/177
- —USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/messages/177