x402-gated premium API access on Base, paid per-request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall on the Base network. The endpoint is live and returns a standard x402 challenge requiring payment in USDC (contract 0x8335…2913 on Base). The maximum amount required per call is 20,000 base units of USDC, which at 6 decimals equals $0.02 per request.
The provider's landing page advertises a broad suite of 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 with no API keys, no rate limits, and instant access. However, this specific endpoint (/api/v1/charges/283) is labeled generically as "Premium API Access" and its exact functionality is not documented beyond that label.
The endpoint accepts HTTP POST requests and returns application/json. Payment is settled via the x402 "exact" scheme to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No OpenAPI schema, detailed request/response documentation, or usage examples were found in the crawl. The docs, pricing, and API pages all rendered only a "Connect wallet" prompt with no additional content.
Capabilities
Use cases
- —Accessing a pay-per-call API without needing API keys or subscriptions
- —Making programmatic requests settled in USDC on Base L2
- —Agent-driven API consumption with automatic micropayment settlement
Fit
Best for
- —Developers wanting keyless, pay-per-use API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users who need detailed API documentation before integrating
- —Anyone without a Base-compatible USDC wallet
- —High-volume consumers who need bulk pricing or rate guarantees
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/283 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, confirming pricing ($0.02 USDC on Base) and payment details. However, there is no documentation of what the endpoint actually does, no request/response schema, no examples, and the crawled docs/pricing/API pages were empty beyond a wallet-connect prompt. The specific functionality behind 'Premium API Access' is entirely opaque.
Warnings
- —No documentation found — docs, pricing, and API pages all render only 'Connect wallet' with no content
- —The exact functionality of /api/v1/charges/283 ('Premium API Access') is undocumented and unclear
- —No OpenAPI spec, request schema, or response schema available
- —The provider lists many other endpoints on the landing page but this specific charge endpoint doesn't map to any of them
Citations
- —Endpoint returns x402 challenge with maxAmountRequired of 20000 base units USDC on Base networkhttps://lowpaymentfee.com/api/v1/charges/283
- —Provider advertises $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/charges/283
- —Provider lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com