Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.
What it does
lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 protocol on the Base network. The `/api/v1/payments/201` endpoint is labeled "Premium API Access" and accepts USDC payments at a maximum cost of $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is settled on-chain to a specified wallet address, with no API keys, rate limits, or upfront commitments required.
The broader platform advertises 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 listed at the same $0.02 per request price point. However, the specific `/api/v1/payments/201` endpoint's exact functionality beyond "Premium API Access" is not documented — it may serve as a general-purpose gateway or a specific resource. The docs, pricing, and API pages behind the site require a wallet connection and provide no further detail in the crawl.
The endpoint is live and returns a valid x402 challenge (HTTP 402) with version 1 of the protocol. It accepts POST requests, settles in USDC on Base (asset contract `0x8335…2913`), and has a 300-second payment timeout. No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl.
Capabilities
Use cases
- —Accessing premium API functionality with per-request USDC micropayments on Base
- —Agent-driven API consumption without pre-registration or API key management
- —Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints
Fit
Best for
- —Developers wanting zero-commitment, pay-per-use API access
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer on-chain USDC micropayments over subscription billing
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Developers without a Base-compatible wallet or USDC holdings
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/201 \
-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 OpenAPI schema, no request/response examples, and the docs/pricing/API pages are empty behind a wallet-connect gate. The exact functionality of this specific endpoint is unclear beyond its label. Effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The exact functionality behind 'Premium API Access' at /api/v1/payments/201 is undocumented
- —All docs, pricing, and API pages require wallet connection and returned no useful content in the crawl
- —No request or response examples could be determined
Citations
- —The endpoint returns a valid x402 challenge with HTTP 402, version 1, on Base networkhttps://lowpaymentfee.com/api/v1/payments/201
- —maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02https://lowpaymentfee.com/api/v1/payments/201
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/payments/201
- —The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/requesthttps://lowpaymentfee.com
- —No API keys, no rate limits, instant access advertisedhttps://lowpaymentfee.com