Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is a collection of x402-enabled API endpoints hosted on the Base network, offering pay-per-request access to a variety of services including data analytics, AI/ML inference, finance/Web3 data, and utility/infrastructure tools. Each call costs $0.02 in USDC (USD Coin on Base), settled on-chain with no API keys, no rate limits, and no subscriptions required.
The specific endpoint `/api/v1/messages/107` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 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 to the payTo address, with a 300-second timeout. The endpoint returns application/json.
The broader platform groups its APIs into four categories: 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). All endpoints share the same $0.02 per-request pricing. No OpenAPI schema, detailed documentation, or example request/response payloads are available from the crawled pages.
Capabilities
Use cases
- —Agents needing on-demand API access without pre-registration or API keys
- —Paying per-call for data analytics, AI inference, or financial data via USDC on Base
- —Programmatic access to utility services (geocoding, validation, conversion) with crypto micropayments
Fit
Best for
- —Developers and agents who want zero-signup, pay-as-you-go API access
- —Use cases requiring low-cost micropayments ($0.02) settled on Base L2
- —Projects already operating with USDC on the Base network
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who need bulk pricing or subscription discounts
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/107 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, no example payloads, and the specific purpose of /api/v1/messages/107 is undocumented beyond the generic label "Premium API Access". The crawled pages beyond the landing page returned only wallet-connect stubs.
Warnings
- —No OpenAPI or schema documentation available for any endpoint
- —The specific function of /api/v1/messages/107 is unclear — 'Premium API Access' is a generic label
- —No example request or response payloads are documented
- —Pricing and /README pages returned no useful content (wallet-connect only)
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/messages/107
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/messages/107
- —All listed APIs cost $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com