x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to gate access to a broad set of endpoints spanning data analytics, AI/ML inference, finance/crypto market data, and general utility services. All endpoints settle payments in USDC on the Base network. The specific endpoint at `/api/v1/stripe/charges/194` is listed as "Premium API Access" and accepts POST requests.
The x402 challenge for this endpoint advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the "exact" payment scheme, with a 300-second timeout.
The platform advertises no API keys, no rate limits, and instant access. However, documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this particular endpoint actually returns. The endpoint path (`/api/v1/stripe/charges/194`) suggests it may relate to Stripe charge data or operations, but this is speculative given the lack of documentation.
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 access to a gated endpoint via x402 payment protocol
Fit
Best for
- —Developers or agents wanting zero-signup, pay-as-you-go API access
- —x402-compatible clients that can settle USDC on Base
- —Use cases requiring low-friction, per-call billing without subscriptions
Not for
- —Users who need detailed API documentation or response schema guarantees before integrating
- —High-volume consumers who would benefit from bulk pricing or rate-limited tiers
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/194 \
-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 ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation of request parameters or response format, and the docs/pricing/README pages are all empty. The purpose of this specific endpoint (/api/v1/stripe/charges/194) is unclear. Effectively a stub listing.
Warnings
- —No OpenAPI spec or schema documentation available
- —All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content
- —The endpoint path '/api/v1/stripe/charges/194' is ambiguous — unclear what it actually does or returns
- —No example requests or responses are available anywhere in the crawled material
- —The numeric ID '194' in the path suggests a resource-specific endpoint but its nature is undocumented
Citations
- —All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units USDC on Base (= $0.02)https://lowpaymentfee.com/api/v1/stripe/charges/194
- —Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/charges/194