Pay-per-call customer data API on Base via x402, settled in USDC at $0.02/request.
What it does
lowpaymentfee.com hosts a collection of x402-enabled API endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The specific endpoint at `/api/v1/customers/14` is labeled "Premium API Access" and returns customer data as JSON via POST. Payment is handled inline using the x402 protocol on the Base network, settling in USDC (contract 0x8335…2913) 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 payment proof.
The broader platform advertises roughly 16 endpoints across four categories: analytics/metrics, AI inference (sentiment, summarization, classification, embeddings), financial data (price feeds, exchange rates, token quotes, gas estimates), and utility services (geocoding, validation, conversion, generation). All are priced uniformly at $0.02 per request. Documentation pages exist at /docs, /pricing, and /README but currently render only a "Connect wallet" prompt with no substantive technical documentation, so the exact request/response schemas for this endpoint are unknown beyond what the x402 challenge reveals (POST, application/json output).
Capabilities
Use cases
- —Retrieving customer records on-demand with per-call USDC micropayments
- —Integrating pay-as-you-go data access into agent workflows without API key management
- —Accessing structured customer data from a crypto-native API gateway
Fit
Best for
- —Developers wanting keyless, pay-per-request API access settled on Base
- —AI agents that can autonomously pay for data via x402
- —Projects needing low-friction access to customer data without subscriptions
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who prefer flat-rate or subscription pricing
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/14 \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The purpose of the /customers/14 endpoint specifically is opaque beyond its label.
Warnings
- —No substantive documentation available — /docs, /pricing, and /README all render only 'Connect wallet'
- —No OpenAPI or JSON schema describing request body or response format for this endpoint
- —The endpoint path '/api/v1/customers/14' with a hardcoded ID is unusual; unclear if it represents a demo or a real resource
- —Request and response schemas are entirely unknown; integration requires trial-and-error
Citations
- —The x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/customers/14
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/customers/14
- —Documentation pages (/docs, /pricing, /README) render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs