Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/wire/25` is listed as "Premium API Access" and follows the same x402 payment pattern.
The platform advertises four main 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 accept POST requests and return JSON.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawled pages. The x402 challenge for this specific endpoint confirms it is live, accepting USDC payments on Base to address 0x1A2B...85F3 with a max amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals).
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time crypto prices, exchange rates, and gas estimates on a per-call basis
- —Running geocoding, validation, or data conversion tasks with micropayments
- —Exporting data or generating analytics reports paid per request
Fit
Best for
- —Agents or developers who want zero-signup, pay-as-you-go API access
- —Use cases requiring small, infrequent API calls without subscription overhead
- —x402-compatible wallets and agents on the Base network
Not for
- —High-volume production workloads where per-call pricing at $0.02 adds up quickly
- —Users who need detailed API documentation, schemas, or guaranteed SLAs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/25 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The endpoint's actual functionality behind 'Premium API Access' is undefined — it is unclear what /api/v1/wire/25 specifically does versus the other listed endpoints.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or JSON schema provided; request and response formats are unknown.
- —The specific purpose of /api/v1/wire/25 ('Premium API Access') is not explained anywhere — it does not appear in the site's listed endpoint catalog.
- —Cannot verify that the advertised AI, finance, and utility endpoints actually function as described.
Citations
- —All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories.https://lowpaymentfee.com
- —x402 challenge returns 402 with maxAmountRequired of 20000 base units in USDC (asset 0x8335…) on Base.https://lowpaymentfee.com/api/v1/wire/25
- —Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.https://lowpaymentfee.com/api/v1/wire/25