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 broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/transactions/342` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is "exact" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.
The broader platform advertises categories including: 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 (geocoding, validation, conversion, generation). However, documentation pages beyond the landing page returned only a "Connect wallet" prompt with no actual API docs, schemas, or example payloads. The exact functionality of the `/api/v1/transactions/342` endpoint specifically is unclear from available materials.
Capabilities
Use cases
- —Agent-driven API consumption without pre-registration or API keys
- —Pay-per-call access to AI inference endpoints (sentiment, summarization, classification, embeddings)
- —On-demand financial data retrieval (prices, exchange rates, gas estimates)
- —Utility operations like geocoding, validation, and data conversion
Fit
Best for
- —AI agents needing frictionless, keyless API access via x402
- —Developers who want pay-as-you-go pricing with no commitments
- —Crypto-native applications that can settle in USDC on Base
Not for
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/342 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and all documentation pages beyond the landing page are empty ('Connect wallet' only). The specific purpose of /api/v1/transactions/342 is unclear — 'Premium API Access' is a generic label. The platform lists many endpoint categories but provides no concrete documentation for any of them.
Warnings
- —No API documentation available — all doc pages return only 'Connect wallet' with no content
- —The specific functionality of /api/v1/transactions/342 is undocumented; 'Premium API Access' is a generic label
- —No OpenAPI spec, request schema, or response schema available
- —No example requests or responses found anywhere in crawled materials
- —The broad catalog of endpoints (AI, finance, analytics, etc.) is advertised but unverifiable without documentation
Citations
- —The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/transactions/342
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/342