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/241` accepts POST requests and charges 20,000 base units of USDC (USD Coin, 6 decimals) on the Base network, which equals $0.02 per request. Payment is handled inline via the X-PAYMENT header with no API keys or accounts required.
The broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning 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 priced at $0.02 per request. However, the specific endpoint `/api/v1/charges/241` is labeled only as "Premium API Access" with no further documentation on what data or functionality it returns. The crawled docs, pricing, and README pages all rendered as empty wallet-connect prompts, so no detailed schema, request/response examples, or feature descriptions are available.
The endpoint is confirmed live: it returns a well-formed x402 challenge (HTTP 402) with version 1, scheme "exact", and a 300-second payment timeout. Settlement goes to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the canonical Base USDC contract (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`).
Capabilities
Use cases
- —Programmatic access to a premium API resource without needing API keys or subscriptions
- —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 documentation or guaranteed SLAs before integrating
- —Use cases requiring free or high-volume bulk access without per-call fees
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/241 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation on what the endpoint actually returns, no request/response schema, and the docs/pricing/README pages are all behind a wallet-connect wall rendering no useful content. The specific function of '/api/v1/charges/241' is unknown beyond the label 'Premium API Access'.
Warnings
- —No documentation available — docs, pricing, and README pages all render only a wallet-connect prompt with no content.
- —The specific functionality of /api/v1/charges/241 is undocumented; 'Premium API Access' is the only description provided.
- —No request body schema or response schema is available; callers cannot know what to send or what to expect back.
- —No OpenAPI spec, ai-plugin manifest, or agents.txt discovered.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/charges/241
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals, so 20000 base units = $0.02https://lowpaymentfee.com/api/v1/charges/241
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com