Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The site hosts a collection of pay-per-request APIs spanning data & analytics, 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 with no API keys, no rate limits, and no commitments required.
The specific endpoint `/api/v1/payments/156` is labeled "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what this particular endpoint returns or what input it expects beyond an HTTP POST. The site's landing page lists many API paths but does not clarify what `/api/v1/payments/156` specifically does versus the other listed endpoints. Treat this as an exploratory or demonstration endpoint until more documentation becomes available.
Capabilities
Use cases
- —Accessing premium API functionality with per-request USDC micropayments on Base
- —Testing x402 payment protocol integrations against a live endpoint
- —Agent-driven API consumption without pre-registration or API keys
Fit
Best for
- —Developers exploring x402 pay-per-request patterns
- —Agents needing keyless, on-demand API access settled in USDC on Base
- —Low-volume consumers who prefer pay-as-you-go over subscriptions
Not for
- —Users needing detailed API documentation or guaranteed SLAs
- —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/payments/156 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and documentation pages are empty beyond a wallet-connect prompt. The purpose of this specific endpoint (/api/v1/payments/156) is unclear.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or schema describing request parameters or response format.
- —The specific function of /api/v1/payments/156 is not explained; it may be a generic or demo endpoint.
- —No request or response examples are available from any source.
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.https://lowpaymentfee.com/api/v1/payments/156
- —Site lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories.https://lowpaymentfee.com