Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.
What it does
lowpaymentfee.com is an x402-enabled API marketplace 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. The platform requires no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.
The specific endpoint `/api/v1/item/38` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The endpoint accepts POST requests and returns `application/json`.
Note that while the site advertises many endpoint categories (sentiment analysis, text summarization, geocoding, price feeds, etc.), the crawled documentation pages were essentially empty (showing only "Connect wallet"), so there is no detailed schema, parameter documentation, or example responses available for any endpoint. The exact functionality behind `/api/v1/item/38` ("Premium API Access") is not described beyond its title, making it unclear what data or service it actually provides.
Capabilities
Use cases
- —Accessing premium API data with per-request USDC micropayments on Base
- —Agent-driven API consumption without pre-registration or API key management
- —On-demand API calls where pay-as-you-go pricing is preferred over subscriptions
Fit
Best for
- —Developers or agents wanting zero-setup, keyless API access
- —Micropayment-based API consumption on Base L2
- —Scenarios requiring no rate limits or minimum commitments
Not for
- —Users who need detailed API documentation or schemas before integrating
- —High-volume use cases where per-request crypto payments add unacceptable latency
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/item/38 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no input/output schema, no example responses, and the purpose of '/api/v1/item/38' ('Premium API Access') is completely opaque. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt.
Warnings
- —No documentation available — all doc pages return only 'Connect wallet' with no content.
- —The exact functionality of /api/v1/item/38 ('Premium API Access') is undescribed; it is unclear what data or service it provides.
- —No OpenAPI spec, input schema, or example responses are available for any endpoint on the platform.
- —The site lists many endpoint categories (AI, finance, analytics, etc.) but none have verifiable documentation.
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin, 6 decimals = $0.02) on Basehttps://lowpaymentfee.com/api/v1/item/38
- —Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/item/38
- —Site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com