Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request 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 endpoints are priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.
The specific endpoint at `/api/v1/messages/98` is listed as "Premium API Access" and carries a maximum charge of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). It accepts HTTP POST requests and returns application/json. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required. The payTo address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the payment timeout is 300 seconds.
Note that while the landing page advertises many endpoints across multiple categories, this specific listing covers `/api/v1/messages/98`. The exact functionality behind this "messages" endpoint is not documented on the site — it does not appear in the publicly listed API catalog. The broader platform's other endpoints (AI, finance, data, utils) are separately accessible at their own paths. Documentation beyond the landing page is gated behind a wallet-connect flow, so detailed request/response schemas are unavailable.
Capabilities
Use cases
- —Programmatic access to premium API content with per-call USDC micropayments
- —Agent-driven workflows that need keyless, pay-as-you-go API access on Base
- —Testing x402 payment flows against a live endpoint
Fit
Best for
- —Developers wanting zero-commitment, pay-per-use API access
- —AI agents with Base USDC wallets needing on-demand endpoints
- —Prototyping x402 payment integrations
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who need bulk pricing or subscription discounts
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/98 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, the specific /messages/98 endpoint is not documented in the public catalog, no OpenAPI schema exists, request/response formats are unknown, and all documentation pages beyond the landing page are gated behind wallet-connect with no useful content.
Warnings
- —The /api/v1/messages/98 endpoint does not appear in the site's publicly listed API catalog — its exact functionality is unknown.
- —No OpenAPI spec, request schema, or response schema is available.
- —Documentation, pricing, and README pages are all gated behind a wallet-connect flow and returned no useful content.
- —The broad catalog of endpoints (AI, finance, data, utils) listed on the homepage could not be independently verified.
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base network for /api/v1/messages/98https://lowpaymentfee.com/api/v1/messages/98
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/messages/98
- —Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com