Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, 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, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.
The specific endpoint `/api/v1/charges/196` is labeled "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout. No OpenAPI schema, detailed documentation, or example request/response payloads were found in the crawl — the docs, pricing, API, and README pages all rendered only a "Connect wallet" prompt with no substantive content.
Because the specific functionality behind `/api/v1/charges/196` is not documented beyond the generic label "Premium API Access," it is unclear what data or service this particular charge endpoint returns. The site lists many different API categories, but this endpoint's path (`/charges/196`) does not map obviously to any of them. Prospective callers should test with a paid request to discover the actual response payload.
Capabilities
Use cases
- —Agents that need on-demand API access without pre-registration or API keys
- —Programmatic pay-per-call access to data, AI, finance, or utility endpoints
- —Demonstrating x402 payment protocol integration on Base
Fit
Best for
- —Developers exploring x402 payment-gated APIs
- —AI agents with Base USDC wallets needing frictionless API calls
- —Low-volume, no-commitment API consumption at $0.02/request
Not for
- —Users who need detailed API documentation or guaranteed SLAs before paying
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/196 \
-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 documentation, no example requests or responses, and the specific functionality of /api/v1/charges/196 is undocumented. The crawled docs/pricing/API pages were empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, API, and README pages all render only 'Connect wallet' with no content.
- —The specific endpoint /api/v1/charges/196 is not described anywhere on the site; its actual response payload is unknown.
- —No OpenAPI or output schema provided beyond minimal x402 challenge metadata.
- —No example request or response bodies are available.
Citations
- —The site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure, all priced at $0.02/requesthttps://lowpaymentfee.com
- —Pricing is $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge confirms live status with maxAmountRequired of 20000 base units of USDC on Base (= $0.02)https://lowpaymentfee.com/api/v1/charges/196
- —Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, asset is USDC at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/charges/196