x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.
What it does
lowpaymentfee.com offers a suite of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/accounts/110` is labeled "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader platform advertises 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 listed endpoints share the same $0.02/request pricing.
However, the specific functionality behind `/api/v1/accounts/110` is not documented beyond its "Premium API Access" label. There is no OpenAPI spec, no request/response schema, and the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content. The endpoint is confirmed live (returns a well-formed 402 challenge), but what data or service it actually returns upon successful payment is unknown.
Capabilities
Use cases
- —Programmatic access to a premium API resource without needing API key registration
- —Agent-driven workflows that pay per call using USDC on Base
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that can settle USDC payments on Base L2
- —Use cases requiring keyless, pay-as-you-go API access
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Applications requiring free or fiat-only payment methods
- —Anyone needing to understand the exact response schema before paying
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/110 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but there is zero documentation on what the endpoint actually returns. No OpenAPI spec, no request/response examples, and the docs pages are empty beyond a wallet-connect prompt. The actual functionality of /api/v1/accounts/110 is completely opaque.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content
- —The specific functionality of /api/v1/accounts/110 ('Premium API Access') is undocumented; it is unclear what data or service is returned upon payment
- —No OpenAPI spec or request/response schema is provided
- —No robots.txt or agents.txt found
Citations
- —The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/accounts/110
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/110
- —All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com