Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the provider, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.
The specific endpoint `/api/v1/payments/154` is labeled "Premium API Access" but the provider does not document what this particular resource returns. The x402 challenge confirms it is live, accepts POST requests, and requires an exact payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
The provider's landing page lists 16 other endpoints covering metrics, reports, data export, insights, 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 price point. However, documentation pages (docs, pricing, README) all render only a "Connect wallet" prompt with no further technical detail, so the actual request/response schemas for this and other endpoints are unknown.
Capabilities
Use cases
- —Programmatic access to a premium API resource with per-call USDC micropayments
- —Agent-driven workflows that need keyless, pay-as-you-go API access on Base
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers exploring x402 payment-gated APIs
- —Agents that can settle USDC payments on Base automatically
- —Users who want no-signup, no-rate-limit API access
Not for
- —Users who need detailed API documentation or response schemas before purchasing
- —Anyone without a Base-compatible USDC wallet
- —High-volume consumers who need bulk pricing or subscription plans
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/154 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no documentation of what the endpoint actually does, no request/response schema, and no examples. The 'Premium API Access' label is generic and uninformative. All doc pages render only 'Connect wallet' with no content.
Warnings
- —No documentation available — all doc/pricing/README pages show only 'Connect wallet'
- —The purpose and response format of /api/v1/payments/154 ('Premium API Access') is completely undocumented
- —No OpenAPI spec, no request schema, no response schema available
- —Cannot verify what data or service this endpoint actually provides
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/payments/154
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The provider offers 16+ endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals, so 20000 base units = $0.02https://lowpaymentfee.com/api/v1/payments/154