Pay-per-call API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com offers a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/wire/10` is listed as "Premium API Access" and accepts USDC payments on Base. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request), consistent with the site's advertised flat $0.02/request pricing.
The broader platform advertises four categories of APIs: 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. The platform emphasizes no API keys, no rate limits, no minimums, and instant access — payment is handled entirely through the x402 protocol using USDC on Base.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The purpose and behavior of the `/api/v1/wire/10` endpoint specifically is unclear — the name "Premium API Access" is generic and does not describe what data or functionality it returns.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration
- —Fetching real-time finance data (prices, exchange rates, gas estimates) with per-call USDC micropayments
- —Using utility services like geocoding, validation, and data conversion on a pay-as-you-go basis
- —Programmatic agents purchasing API calls autonomously via x402 on Base
Fit
Best for
- —Developers wanting zero-signup, pay-per-use API access
- —AI agents that can settle payments autonomously via x402/USDC on Base
- —Low-volume or sporadic API consumers who don't want subscriptions
Not for
- —High-volume production workloads needing SLAs and guaranteed uptime
- —Users who need detailed API documentation and response schemas before integrating
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/10 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/wire/10 is entirely unclear. The docs/pricing/API pages are empty beyond a wallet connect prompt.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content
- —The specific purpose and expected input/output of /api/v1/wire/10 ('Premium API Access') is undefined
- —No OpenAPI schema or request/response examples provided for any endpoint
- —No rate limit or SLA information available
- —Cannot verify that the advertised AI, finance, and utility endpoints actually function as described
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/wire/10
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/wire/10
- —Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Four API categories listed: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructurehttps://lowpaymentfee.com