Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/accounts/128` is labeled "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader lowpaymentfee.com platform advertises 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 are listed at the same $0.02/request price point. However, this specific listing covers only the `/api/v1/accounts/128` endpoint, whose exact functionality beyond "Premium API Access" is not documented in the crawled material.
The endpoint is live and returns a well-formed x402 challenge (HTTP 402) with version 1 of the protocol. Documentation pages (/docs, /pricing, /README) all resolve but contain only a "Connect wallet" prompt with no substantive content, so the actual request/response schema for this endpoint is unknown.
Capabilities
Use cases
- —Accessing premium API data without creating an account or obtaining API keys
- —Making one-off paid API calls settled instantly in USDC on Base
- —Agent-driven workflows that need permissionless, pay-as-you-go API access
Fit
Best for
- —Developers who want zero-signup, pay-per-use API access
- —AI agents with x402-compatible wallets on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —Anyone without a Base-compatible USDC wallet
- —High-volume consumers who would benefit from bulk pricing or subscriptions
Quick start
# The endpoint returns 402 with an x402 challenge.
# Attach a valid X-PAYMENT header to authorize.
curl -X POST https://lowpaymentfee.com/api/v1/accounts/128 \
-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 documentation of what the endpoint actually does, no request/response schema, and no examples. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. The listing is effectively a stub with confirmed liveness and pricing.
Warnings
- —The exact functionality of /api/v1/accounts/128 is undocumented — 'Premium API Access' is the only description available.
- —All documentation pages (/docs, /pricing, /README) contain no substantive content.
- —No request body schema or response schema is available; callers must discover behavior experimentally.
- —The broader platform lists many endpoints but none have documented input/output contracts.
Citations
- —Endpoint returns HTTP 402 with x402 version 1 challenge, maxAmountRequired 20000 in USDC on Basehttps://lowpaymentfee.com/api/v1/accounts/128
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/accounts/128
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com