Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, settled in USDC on the Base network. The platform requires no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/customers/76` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the "exact" scheme. The endpoint accepts POST requests and returns `application/json`.
While the landing page advertises a broad suite of endpoints (sentiment analysis, text summarization, embeddings, price feeds, geocoding, etc.), the crawled documentation pages were essentially empty (showing only "Connect wallet"), so there is no detailed schema, parameter documentation, or example responses available for any endpoint. The purpose of the `/api/v1/customers/76` path specifically is unclear — it may be a demo or customer-specific resource. Treat the broader endpoint catalog with caution until documentation is fleshed out.
Capabilities
Use cases
- —Accessing premium API data without managing API keys or subscriptions
- —Making one-off paid API calls settled instantly in USDC on Base
- —Agent-driven workflows that need low-friction, per-request billing
Fit
Best for
- —Developers or agents wanting zero-signup, pay-as-you-go API access
- —Crypto-native applications that can settle payments on Base L2
- —Low-volume or sporadic API consumers who don't want subscriptions
Not for
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Non-crypto users without access to USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/76 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, documentation pages are empty, there is no OpenAPI schema, no example request/response bodies, and the purpose of the specific /api/v1/customers/76 path is unclear. This is effectively a stub listing.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) all returned only 'Connect wallet' with no actual content.
- —The specific endpoint path /api/v1/customers/76 is not listed on the landing page's catalog — its purpose is unknown.
- —No OpenAPI schema, request parameters, or response examples are available for any endpoint.
- —The broader catalog of endpoints (AI, finance, utils) is advertised but unverifiable from crawl data.
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base, using exact scheme.https://lowpaymentfee.com/api/v1/customers/76
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network.https://lowpaymentfee.com/api/v1/customers/76
- —Payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.https://lowpaymentfee.com/api/v1/customers/76