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/accounts/1` 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 scheme is "exact" with a 300-second timeout. The endpoint accepts POST requests.
The broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 per-call price point. Documentation pages beyond the landing page appear to require wallet connection and contain no additional content.
Capabilities
Use cases
- —Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time crypto token quotes and gas estimates via micropayment
- —Geocoding and data validation as utility calls from automated workflows
- —Exporting analytics data or generating reports on a per-request billing basis
- —Accessing exchange rates and price feeds without subscription commitments
Fit
Best for
- —AI agents that need diverse utility endpoints behind a single payment protocol
- —Developers who want zero-setup, keyless API access settled in USDC on Base
- —Low-volume or bursty workloads where per-call pricing is more economical than subscriptions
Not for
- —High-volume production workloads where bulk/subscription pricing would be cheaper
- —Users who need detailed API documentation or OpenAPI schemas before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/1 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI schema, no documentation beyond the landing page, no example request/response payloads, and the purpose of the specific /api/v1/accounts/1 endpoint is unclear beyond its generic 'Premium API Access' label.
Warnings
- —No OpenAPI or schema documentation available — all docs pages just show 'Connect wallet'
- —The specific purpose of /api/v1/accounts/1 is unclear; the description 'Premium API Access' is generic
- —No example request or response bodies are available to confirm what data this endpoint returns
- —The platform lists many endpoints but none have documented input/output schemas
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge for /api/v1/accounts/1 advertises maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/accounts/1
- —Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com