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/transactions/93` is listed as "Premium API Access" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.
The broader platform advertises multiple API categories including 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 uniformly priced at $0.02 per request.
However, the specific functionality of the `/api/v1/transactions/93` endpoint is not documented beyond its "Premium API Access" label. The crawled docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no additional technical documentation, schemas, or example payloads. Without further documentation it is unclear what data or service this particular endpoint returns when a valid payment is submitted.
Capabilities
Use cases
- —Accessing premium API data without creating an account or managing API keys
- —Making one-off paid API calls from autonomous agents using x402 USDC payments
- —Integrating pay-as-you-go API services into Web3 applications
Fit
Best for
- —Developers who want zero-signup, pay-per-use API access
- —AI agents that can settle payments via x402 on Base
- —Projects needing low-friction micropayment-gated endpoints
Not for
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —Applications requiring high-volume bulk pricing or subscription plans
- —Developers who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/93 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example request/response payloads, and the specific functionality of this endpoint is entirely undocumented. The docs/pricing/README pages all render only a wallet-connect prompt with no useful content.
Warnings
- —The specific functionality of /api/v1/transactions/93 ('Premium API Access') is completely undocumented — it is unclear what data or service it provides.
- —All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no technical content.
- —No OpenAPI spec, request schema, or response schema is available.
- —The platform lists many endpoint categories (AI, finance, analytics, infrastructure) but none have visible documentation to verify actual functionality.
Citations
- —Endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 USDC base units on Base networkhttps://lowpaymentfee.com/api/v1/transactions/93
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/transactions/93
- —Platform lists Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categorieshttps://lowpaymentfee.com