Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.
The specific endpoint `/api/v1/customers/84` is listed as "Premium API Access" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme, with a 300-second timeout. The endpoint accepts POST requests and returns application/json.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation. However, documentation pages (docs, pricing, README) all resolve to minimal "Connect wallet" stubs, so detailed request/response schemas for individual endpoints are not available. The actual data or functionality behind `/api/v1/customers/84` specifically is unclear from the available material — the generic "Premium API Access" label does not describe what data it returns.
Capabilities
Use cases
- —Accessing premium API data with per-request USDC micropayments on Base
- —Agent-driven API consumption without pre-registration or API keys
- —Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints
Fit
Best for
- —Developers wanting zero-commitment, pay-per-use API access
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Users without access to USDC on the Base network
Quick start
# 1. Send a POST to get the 402 challenge
curl -X POST https://lowpaymentfee.com/api/v1/customers/84
# 2. Parse the 402 response, construct an x402 payment header
# using USDC on Base (max 20000 base units = $0.02)
# 3. Resend with X-PAYMENT header attached
curl -X POST https://lowpaymentfee.com/api/v1/customers/84 \
-H "X-PAYMENT: <signed-payment-payload>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documentation beyond wallet-connect stubs, and the specific functionality of /api/v1/customers/84 is entirely unclear. No request or response examples are available.
Warnings
- —Documentation pages (/docs, /pricing, /README) all return only 'Connect wallet' with no actual content.
- —The purpose and response schema of /api/v1/customers/84 ('Premium API Access') is not documented — it is unclear what data this endpoint returns.
- —No OpenAPI spec or detailed endpoint documentation is available.
- —The platform lists many endpoints on its landing page but none have documented schemas.
Citations
- —All endpoints priced at $0.02 per request with no API keys, rate limits, or commitmentshttps://lowpaymentfee.com
- —x402 challenge requests maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/customers/84
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/customers/84
- —Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com