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 settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/70` is listed as "Premium API Access" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or rate limits are advertised; callers pay per request via the x402 protocol's X-PAYMENT header.
The wider platform advertises four endpoint 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 listed endpoints share the same $0.02/request pricing. However, the specific `/api/v1/messages/70` path does not clearly map to any of these advertised categories, and no documentation describes what "messages/70" actually returns.
The endpoint is live and returns a valid x402 challenge (HTTP 402) with scheme "exact" on the Base network, paying to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` in USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The method is POST and the output MIME type is `application/json`. No OpenAPI schema, request body schema, or response schema is provided, so the exact input/output contract is unknown.
Capabilities
Use cases
- —Programmatic access to a premium API resource without needing API keys or subscriptions
- —Agent-driven workflows that need to pay per call using USDC on Base
- —Testing x402 protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers or agents wanting keyless, pay-per-use API access
- —x402 protocol experimentation at low cost ($0.02/call)
- —Scenarios where no signup or rate-limit management is desired
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —High-volume use cases where per-request pricing may add up without bulk discounts
- —Anyone who needs to know the exact request/response schema before calling
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/70 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation for the /api/v1/messages/70 path specifically — it doesn't match any of the advertised endpoint categories. No request or response schema is available, and the crawled docs/pricing/README pages returned only 'Connect wallet' with no useful content.
Warnings
- —The /api/v1/messages/70 path is not listed among the platform's advertised endpoints; its purpose is unclear.
- —No request body schema or response schema is documented anywhere.
- —The /pricing, /api, and /README pages returned no meaningful content (only 'Connect wallet').
- —No OpenAPI spec, ai-plugin manifest, or agents.txt is available.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/messages/70
- —USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/messages/70
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Platform lists endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com