Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.
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/88` 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/request price point.
This particular endpoint (`/api/v1/accounts/88`) falls under "Premium API Access" but its exact response payload is undocumented — no OpenAPI spec, no example responses, and the docs/pricing/README pages all render only a "Connect wallet" prompt with no further content. The endpoint is live and responds with a well-formed x402 challenge, but the lack of documentation means callers cannot know what data or functionality it returns without making a paid request.
Capabilities
Use cases
- —Accessing premium account data via a single paid HTTP POST call
- —Agent-driven workflows that need on-demand API access without pre-registration
- —Programmatic pay-as-you-go data retrieval settled in USDC on Base
Fit
Best for
- —Developers or agents wanting zero-signup, pay-per-call API access
- —x402-compatible agent wallets on the Base network
- —Low-cost micropayment API consumption at $0.02 per request
Not for
- —Users who need detailed API documentation or response schemas before purchasing
- —High-throughput batch workloads where per-request pricing may add up
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/88 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI spec, no documented request/response schema, and no example payloads. The docs, pricing, and README pages all render only a wallet-connect prompt with no usable content. The actual functionality behind 'Premium API Access' at /api/v1/accounts/88 is unknown.
Warnings
- —No OpenAPI or schema documentation available — response format is completely unknown
- —Docs, pricing, and README pages contain no readable content beyond 'Connect wallet'
- —The purpose of /api/v1/accounts/88 ('Premium API Access') is not explained anywhere
- —Cannot verify what data or service is returned without making a paid request
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/88
- —The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/requesthttps://lowpaymentfee.com
- —Platform advertises no API keys, no rate limits, instant access, and Base network settlementhttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/accounts/88