x402-gated premium API access on Base, paid per-call in USDC at $0.02/request.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall. The site hosts a broad catalog of pay-per-call 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, settled in USDC on the Base network.
The specific endpoint `/api/v1/stripe/charges/145` is listed under the title "Premium API Access." Its x402 challenge confirms it is live, accepting POST requests, and requires an exact payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised — access is purely payment-gated.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no examples describing what this particular endpoint returns or what parameters it accepts. The endpoint path suggests it may relate to Stripe charge creation or lookup, but this is speculative. Prospective users should test with a small payment to discover the actual behavior.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint without needing API keys or subscriptions
- —Agent-driven pay-per-call workflows settled in USDC on Base
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers exploring x402 payment-gated APIs
- —Agents that need keyless, per-request API access on Base
- —Low-cost micropayment experimentation ($0.02/call)
Not for
- —Users who need detailed API documentation or guaranteed SLAs before purchasing
- —High-throughput batch workloads where per-request crypto settlement adds latency
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/145 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual functionality behind 'Premium API Access' at this specific path is unknown. The docs pages are empty beyond a wallet-connect prompt.
Warnings
- —No OpenAPI spec or request/response schema available
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content
- —The actual functionality of /api/v1/stripe/charges/145 is undocumented — the endpoint name suggests Stripe charge operations but this is unconfirmed
- —No examples of expected input parameters or output format
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 (6 decimals = $0.02) on Base with 300-second timeouthttps://lowpaymentfee.com/api/v1/stripe/charges/145
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/stripe/charges/145
- —Site offers APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com