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 & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/customers/100` is listed as "Premium API Access" and returns `application/json`. Its x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the "exact" scheme with a 300-second timeout.
The broader platform also advertises AI endpoints (sentiment analysis, text summarization, classification, embeddings), financial data endpoints (price feeds, exchange rates, token quotes, gas estimates), analytics endpoints (metrics, reports, data export, insights), and utility endpoints (geocoding, validation, conversion, generation). Documentation pages exist but currently render only a wallet-connect prompt with no substantive content, so the actual request/response schemas for each endpoint are unknown.
Capabilities
Use cases
- —Querying real-time financial data (prices, exchange rates, gas estimates) with per-call USDC payments
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) without API key management
- —Accessing utility services like geocoding, validation, and data conversion on a pay-as-you-go basis
- —Retrieving customer or analytics data via premium API access endpoints
Fit
Best for
- —Developers who want zero-commitment, keyless API access paid in crypto
- —AI agents that can settle x402 micropayments on Base
- —Projects needing a variety of lightweight API services at uniform low cost
Not for
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —High-volume production workloads that benefit from bulk pricing or rate-limit guarantees
- —Teams that cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/100 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation content (all doc pages render only a wallet-connect prompt), and no example request/response payloads. The purpose of the specific /api/v1/customers/100 endpoint is unclear beyond the generic 'Premium API Access' label.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) all render only a wallet-connect prompt with no actual content.
- —No OpenAPI or JSON schema available for any endpoint — request and response formats are unknown.
- —The specific purpose of /api/v1/customers/100 ('Premium API Access') is not documented; it may be a demo or placeholder endpoint.
- —The broad catalog of endpoints (AI, finance, utilities) is advertised on the landing page but none have been individually verified beyond this single endpoint.
Citations
- —Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/customers/100
- —Platform lists endpoints at $0.02/request with no API keys, no rate limits, and no minimumshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/customers/100
- —Platform offers data & analytics, AI & ML, finance & Web3, and infrastructure utility endpointshttps://lowpaymentfee.com