Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The site hosts a collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities, all priced at $0.02 per request. The specific endpoint `/api/v1/charges/116` is labeled "Premium API Access" and accepts POST requests, settling payments in USDC on the Base network.
The x402 challenge confirms the endpoint is live, requiring up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call, paid to address `0x1A2B...85F3`. The payment scheme is "exact" with a 300-second timeout. No API keys or rate limits are advertised — access is gated purely by the x402 payment header.
However, the specific functionality behind `/api/v1/charges/116` is unclear. The site lists many distinct API paths (analytics, AI, finance, utilities), but this particular charge endpoint is not explicitly documented among them. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and the docs/pricing/README pages all render only a "Connect wallet" prompt with no additional content. The actual data or service returned after payment is unknown from available materials.
Capabilities
Use cases
- —Accessing pay-per-request API services without traditional API key registration
- —Making micropayments for API calls using USDC on Base
- —Agent-driven API consumption with x402 payment protocol
Fit
Best for
- —Developers wanting keyless, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or guaranteed SLAs before purchasing
- —Anyone without a Base-network USDC wallet
- —Use cases requiring free or trial-tier access
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/116 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the actual functionality behind this specific endpoint is undocumented. No OpenAPI spec, no request/response examples, and docs pages are empty beyond a wallet-connect prompt. The listing is effectively a stub with confirmed liveness.
Warnings
- —The specific service or data returned by /api/v1/charges/116 is not documented anywhere in the crawled material.
- —All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no substantive content.
- —No OpenAPI specification or request/response schema is available.
- —It is unclear how this 'charges/116' endpoint relates to the other listed API paths on the site.
Citations
- —Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/charges/116
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/charges/116
- —Site advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Docs, pricing, README, and API pages render only 'Connect wallet' with no additional documentationhttps://lowpaymentfee.com/docs