x402-gated premium API endpoint on Base, paying $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com is part of a broader suite of x402-protocol APIs covering data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities. The specific resource `/api/v1/stripe/charges/122` is listed under the title "Premium API Access" and is gated behind an x402 payment challenge on the Base network, accepting USDC (contract 0x8335…2913) with a maximum amount of 20,000 base units — equivalent to $0.02 per request (USDC uses 6 decimals). Payment is made via the `exact` scheme to address 0x1A2B…85F3, with a 300-second timeout.
The provider's landing page advertises a flat $0.02/request pricing model across all endpoints, with no API keys, no rate limits, no minimums, and instant access. The site lists endpoints spanning metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, the specific functionality behind `/api/v1/stripe/charges/122` is not clearly documented — the path suggests it may relate to Stripe charge data or a payment-related operation, but no schema, request/response examples, or detailed documentation were found.
Documentation pages (/docs, /api, /pricing, /README) all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no ai-plugin manifest, and no robots.txt or agents.txt. The endpoint is confirmed live (402 challenge captured), but the lack of documentation about what this specific endpoint actually returns is a significant gap.
Capabilities
Use cases
- —Programmatic access to a premium API resource with per-call USDC micropayments
- —Agent-driven workflows that need keyless, pay-as-you-go API access on Base
- —Integrating x402-compatible payment flows into automated pipelines
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that can settle USDC payments on Base L2
- —Use cases requiring no-signup, no-API-key access
Not for
- —Users who need detailed documentation or OpenAPI specs before integrating
- —Production workloads requiring guaranteed SLAs or support
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/122
# Returns 402 with x402 payment challenge.
# Include X-PAYMENT header with valid payment proof to access the resource.Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI spec, no request/response examples, and the specific purpose of /api/v1/stripe/charges/122 is unclear. Documentation pages are empty beyond a wallet-connect prompt.
Warnings
- —No documentation available — /docs, /api, /pricing, /README all return only 'Connect wallet'
- —No OpenAPI or schema describing what this endpoint accepts or returns
- —The specific function of /api/v1/stripe/charges/122 is undocumented and unclear from the path alone
- —No request or response examples available
Citations
- —Endpoint returns 402 with x402 challenge on Base network accepting USDC at maxAmountRequired 20000 base unitshttps://lowpaymentfee.com/api/v1/stripe/charges/122
- —Flat $0.02/request pricing, no API keys, no rate limits, no minimumshttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/charges/122