Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The specific resource at `/api/v1/charges/173` accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is handled entirely through the x402 header mechanism — no API keys, accounts, or rate limits are required.
The broader lowpaymentfee.com platform advertises a suite of 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 listed at $0.02 per request. However, this specific listing is for the `/api/v1/charges/173` resource, whose exact functionality beyond "Premium API Access" is not documented in the crawled material.
The endpoint is live and returns a valid x402 challenge (HTTP 402) with version 1 of the protocol. The payment timeout is 300 seconds, and the payee address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. Documentation pages on the site (docs, pricing, README) all resolve but contain only a "Connect wallet" prompt with no further technical detail, so the actual request/response schema for this specific charge endpoint is unknown.
Capabilities
Use cases
- —Programmatic access to a premium API resource without needing an API key or subscription
- —Agent-driven workflows that pay per call using USDC on Base
- —Testing x402 payment protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers exploring x402 payment-gated APIs
- —AI agents that need keyless, pay-as-you-go API access
- —Low-cost per-request API consumption settled on Base L2
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —Use cases requiring known, well-documented request/response schemas
- —High-volume workloads where $0.02/request adds up significantly
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/173 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but the actual functionality behind 'Premium API Access' at /api/v1/charges/173 is completely undocumented. No request/response schema, no examples, and all documentation pages are empty beyond a wallet-connect prompt. The listing is effectively a stub.
Warnings
- —The exact functionality of /api/v1/charges/173 ('Premium API Access') is not documented anywhere in the crawled material.
- —All documentation pages (/docs, /pricing, /README, /api) return only a 'Connect wallet' prompt with no technical content.
- —No request body schema or response schema is available — callers cannot know what to send or what to expect back.
- —The relationship between this specific charge endpoint and the broader suite of advertised APIs (analytics, AI, finance, utils) is unclear.
Citations
- —Endpoint returns HTTP 402 with x402 version 1 challenge requiring USDC payment on Basehttps://lowpaymentfee.com/api/v1/charges/173
- —maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02https://lowpaymentfee.com/api/v1/charges/173
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com