Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/accounts/73` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader platform offers endpoints across 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02 per request price point.
This particular endpoint (`/api/v1/accounts/73`) falls under "Premium API Access" but its exact functionality is not documented beyond the title. The crawled docs, pricing, and README pages all returned only a "Connect wallet" prompt with no additional content, so the specific request/response schema for this endpoint is unknown. Callers should be aware that the endpoint accepts POST requests and returns application/json, but the input parameters and output structure are not publicly documented.
Capabilities
Use cases
- —Accessing premium account data via a single micropayment without subscription or API key
- —Integrating pay-per-call endpoints into agent workflows that settle payments on Base
- —Testing x402 protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need keyless, pay-as-you-go API access
- —Low-volume callers who want to avoid subscriptions
Not for
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —High-volume production workloads where $0.02/request adds up quickly
- —Users without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/73 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"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 documentation of request/response formats, and the docs/pricing/README pages are all blank beyond a wallet-connect prompt. The specific purpose of /api/v1/accounts/73 is unclear beyond its title.
Warnings
- —No documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content
- —The specific functionality of /api/v1/accounts/73 ('Premium API Access') is undocumented; input parameters and response schema are unknown
- —No OpenAPI or machine-readable schema provided
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base networkhttps://lowpaymentfee.com/api/v1/accounts/73
- —The platform lists endpoints at $0.02/request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/accounts/73
- —Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categorieshttps://lowpaymentfee.com