x402-gated premium API endpoint on Base, payable in USDC at $0.02 per request.
What it does
This endpoint at lowpaymentfee.com is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all gated via the x402 payment protocol. The specific endpoint `/api/v1/stripe/charges/87` is listed as "Premium API Access" but its exact functionality is not documented beyond that label. The platform advertises a flat $0.02 per request pricing model with no API keys, no rate limits, and instant access.
Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with the "exact" payment scheme. The x402 challenge confirms the endpoint is live, accepting POST requests, with a maxAmountRequired of 20000 base units (USDC has 6 decimals, so this equals $0.02). The payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 and the timeout is 300 seconds.
The platform hosts numerous other endpoints covering sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02 price point. However, documentation is extremely sparse: the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no examples available for this or any other endpoint on the platform.
Capabilities
Use cases
- —Accessing a premium API resource with per-request USDC micropayments on Base
- —Integrating x402-compatible payment flows into agent workflows
- —Testing x402 protocol payment challenges against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that can settle USDC payments on Base L2
- —Use cases requiring keyless, pay-per-request API access
Not for
- —Users needing well-documented API contracts with clear request/response schemas
- —Production workloads requiring SLA guarantees or detailed error handling documentation
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/87 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no documentation of what the endpoint actually does, no request/response schema, no examples, and the docs pages are empty beyond a wallet connect prompt. The endpoint name 'stripe/charges/87' is opaque and unexplained. This is effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content
- —The specific functionality of /api/v1/stripe/charges/87 ('Premium API Access') is completely undocumented
- —No OpenAPI spec or request/response schema provided
- —No examples of successful responses available
- —The endpoint path references 'stripe/charges' which is ambiguous — unclear if this proxies Stripe or is unrelated
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 USDC base units on Base networkhttps://lowpaymentfee.com/api/v1/stripe/charges/87
- —Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/charges/87
- —Docs, API, pricing, and README pages render only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs