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/259` 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, the specific endpoint being listed here (`/api/v1/charges/259`) is labeled only as "Premium API Access" with no further documentation on what data or functionality it returns.
The endpoint is confirmed live: it returns a proper 402 challenge with x402 version 1, specifying the "exact" payment scheme, a 300-second timeout, and payment to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. Without further documentation or example responses, it is unclear what payload this specific endpoint returns upon successful payment.
Capabilities
Use cases
- —Programmatic access to premium API data without requiring account signup or API keys
- —Agent-driven workflows that need on-demand paid API calls settled in USDC on Base
- —Testing x402 payment protocol integrations with a low-cost live endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —AI agents that need keyless, pay-per-use API access
- —Low-cost micropayment API consumption on Base L2
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Anyone requiring non-crypto payment methods (no fiat option available)
- —Use cases needing high-throughput batch access at volume discounts
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/259 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example request/response, and the specific functionality behind '/api/v1/charges/259' is entirely undocumented. The docs, API, pricing, and README pages are all empty beyond a wallet-connect prompt.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content
- —The specific functionality of /api/v1/charges/259 ('Premium API Access') is not described anywhere
- —No request or response schema is provided; callers cannot know what to send or what to expect back
- —The platform lists many endpoint categories (AI, analytics, finance, infrastructure) but none are documented
Citations
- —Endpoint returns 402 with x402 version 1 challenge, maxAmountRequired 20000 USDC on Basehttps://lowpaymentfee.com/api/v1/charges/259
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/charges/259
- —All endpoints listed at $0.02/request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com