Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 market data, and infrastructure utilities. All endpoints are paid per-request using the x402 protocol, settling in USDC on the Base network. The specific endpoint listed here (`/api/v1/customers/77`) is labeled "Premium API Access" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02).
The platform advertises a uniform $0.02-per-request pricing model with no API keys, no rate limits, no minimums, and no commitments. Payment is handled entirely via the x402 payment header, meaning agents can call any endpoint by attaching a valid USDC payment proof. The 402 challenge was confirmed live on the probed endpoint, returning a well-formed x402 v1 challenge with the `exact` scheme on Base.
Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples available. The endpoint path `/api/v1/customers/77` suggests a customer data resource, but without documentation it is unclear what data is returned or what POST body (if any) is expected.
Capabilities
Use cases
- —Agents needing on-demand data analytics or reports without API key registration
- —Per-call AI inference (sentiment, summarization, classification, embeddings) paid in USDC
- —Fetching real-time crypto quotes, gas estimates, or exchange rates via micropayment
- —Utility operations like geocoding, validation, or data conversion without subscription
Fit
Best for
- —AI agents with x402-compatible USDC wallets on Base
- —Developers wanting zero-signup, pay-as-you-go API access
- —Low-volume or bursty workloads where per-call pricing is cheaper than subscriptions
Not for
- —High-volume production workloads where $0.02/request adds up quickly
- —Users who need detailed API documentation, SLAs, or guaranteed uptime
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/77 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint works. However, documentation is essentially nonexistent — all doc pages return only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of the specific /api/v1/customers/77 endpoint is unclear beyond its generic 'Premium API Access' label.
Warnings
- —No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'
- —No OpenAPI or schema definition found for any endpoint
- —The specific endpoint /api/v1/customers/77 has no description of expected input or output
- —The broad catalog of endpoints (AI, finance, data, utils) is listed on the homepage but none have been individually verified as live beyond this one endpoint
- —Unknown what POST body, if any, is expected by this endpoint
Citations
- —Uniform pricing of $0.02 per request with no API keys, no rate limits, no minimumshttps://lowpaymentfee.com
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/customers/77
- —Payment settles to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3https://lowpaymentfee.com/api/v1/customers/77