x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-protocol API platform that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/accounts/86` is listed as "Premium API Access" and accepts POST requests with payment via the x402 exact scheme. The 402 challenge indicates a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request given USDC's 6 decimals.
The broader platform advertises four categories of APIs: 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 with no API keys, no rate limits, and no minimum commitments required.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The specific functionality of the `/api/v1/accounts/86` endpoint is unclear beyond its generic "Premium API Access" label. Without documentation or schema details, it is difficult to determine what data this endpoint returns or what input it expects.
Capabilities
Use cases
- —Accessing premium API data with per-call USDC micropayments on Base
- —Agent-driven API consumption without pre-registration or API keys
- —Pay-as-you-go access to data, AI, finance, or utility endpoints
Fit
Best for
- —Developers wanting keyless, pay-per-request API access
- —AI agents that can settle x402 payments on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or OpenAPI specs before integrating
- —Applications requiring free or fiat-only payment methods
- —High-volume use cases where per-request pricing may add up
Quick start
# The endpoint requires an x402 X-PAYMENT header with USDC on Base.
# 1. Send a POST to get the 402 challenge:
curl -X POST https://lowpaymentfee.com/api/v1/accounts/86
# 2. Parse the 402 JSON, construct payment proof, then resend with:
# X-PAYMENT: <signed-payment-header>Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC payments on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet connect prompt. The specific purpose of /api/v1/accounts/86 is undocumented.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
- —No OpenAPI or request/response schema provided for any endpoint
- —The specific function of /api/v1/accounts/86 ('Premium API Access') is not documented anywhere
- —Cannot verify what data or service this endpoint actually returns without making a paid request
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/accounts/86
- —USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/accounts/86
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categorieshttps://lowpaymentfee.com