Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.
What it does
lowpaymentfee.com is a pay-per-request API platform that gates access to a broad set of endpoints using the x402 payment protocol. Each call costs $0.02 in USDC on the Base network, with no API keys, no rate limits, and no subscriptions required. The specific endpoint at `/api/v1/messages/196` is labeled "Premium API Access" and follows the same x402 payment pattern.
The platform advertises four categories of APIs: 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 listed at $0.02 per request.
The probed endpoint returned a valid x402 challenge with `maxAmountRequired` of 20000 base units of USDC (0x8335… on Base), which equals $0.02 (USDC uses 6 decimals). Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The endpoint accepts POST requests and returns `application/json`. No OpenAPI schema, detailed documentation, or example responses 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 a generic pay-per-call API endpoint without needing API keys or subscriptions
- —Making micropayment-gated HTTP requests settled in USDC on Base
- —Integrating agent-driven workflows that pay per request via x402 protocol
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer crypto micropayments over traditional billing
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/196 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Example
Request
{
"url": "https://lowpaymentfee.com/api/v1/messages/196",
"body": {},
"method": "POST",
"headers": {
"X-PAYMENT": "<x402-payment-token>",
"Content-Type": "application/json"
}
}Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, no example responses, and the specific purpose of `/api/v1/messages/196` is entirely unclear. The crawled subpages (/api, /pricing, /README) returned no useful content. This is effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available for any endpoint
- —The specific purpose and expected input/output of /api/v1/messages/196 is undocumented
- —Subpages (/api, /pricing, /README) returned only 'Connect wallet' with no content
- —The broad range of advertised API categories (AI, finance, data, infrastructure) could not be verified — no response examples or detailed docs exist
- —Unknown what 'messages/196' refers to — could be a specific message resource or a generic endpoint ID
Citations
- —Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/messages/196
- —Platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com