x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that exposes a variety of endpoints across four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints are pay-per-request using the x402 protocol on the Base network, accepting USDC payments with no API keys, no rate limits, and no commitments required.
The specific endpoint at `/api/v1/item/31` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. The endpoint accepts POST requests and returns application/json. However, the exact functionality behind this particular item ID is not documented — the site's landing page lists many named endpoints (metrics, reports, sentiment analysis, summarization, etc.) but `/api/v1/item/31` does not map clearly to any of them.
The broader platform advertises endpoints priced at $0.02 per request, though the 402 challenge for this specific endpoint shows a maxAmountRequired of 20,000 (in the asset's smallest unit). Documentation pages (/docs, /pricing, /README) returned only a "Connect wallet" prompt with no substantive content, so detailed request/response schemas, parameter descriptions, and usage examples are unavailable.
Capabilities
Use cases
- —Accessing premium API data without traditional API key registration
- —Making pay-per-request calls from autonomous agents via x402
- —Integrating low-friction paid endpoints into workflows on the Base network
Fit
Best for
- —Agents or developers wanting keyless, pay-per-use API access
- —x402-compatible clients on the Base network
- —Quick one-off API calls without subscription commitments
Not for
- —Users needing detailed API documentation or OpenAPI specs before integrating
- —High-volume use cases where per-request pricing may be expensive
- —Anyone requiring non-USDC or non-Base payment options
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/item/31 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid 402 challenge, but the specific functionality of /api/v1/item/31 is undocumented. All documentation pages returned only 'Connect wallet' with no content. No request/response schemas, no examples, and no clear description of what this item endpoint actually does.
Warnings
- —The exact purpose of /api/v1/item/31 is unknown — it does not correspond to any named endpoint on the landing page.
- —All documentation pages (/docs, /pricing, /README, /api) returned only a 'Connect wallet' prompt with no substantive documentation.
- —maxAmountRequired is 20000 in USDC smallest units; actual dollar cost depends on USDC decimals (likely $0.02 if 6 decimals).
- —No OpenAPI spec, no request/response schema, and no usage examples are available.
Citations
- —The landing page lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request.https://lowpaymentfee.com
- —The platform advertises no API keys, no rate limits, instant access, and Base network payments.https://lowpaymentfee.com
- —The 402 challenge for /api/v1/item/31 requests USDC on Base with maxAmountRequired of 20000 and a 300-second timeout.https://lowpaymentfee.com/api/v1/item/31
- —Documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no content.https://lowpaymentfee.com/docs