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 collection of x402-protocol pay-per-call API endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/stripe/charges/198` is listed as "Premium API Access" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which has 6 decimals), equating to $0.02 per request. Payment is made via the x402 exact scheme by including an X-PAYMENT header.
The broader platform offers endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments.
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 usage examples available from the crawled material. The endpoint is confirmed live (returns a valid 402 challenge), but the actual behavior and response format of this specific charges endpoint remain unknown.
Capabilities
Use cases
- —Programmatic access to a Stripe charges resource via crypto micropayment
- —Agent-driven API consumption without traditional API key provisioning
- —Pay-per-call access to analytics, AI, finance, or utility endpoints on Base
Fit
Best for
- —Developers wanting keyless, pay-per-request API access settled in USDC on Base
- —AI agents that can handle x402 payment challenges natively
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or OpenAPI specs before integration
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Anyone requiring fiat-only payment rails with no crypto involvement
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/198
# Returns 402 with x402 challenge; include X-PAYMENT header with signed USDC payment on Base to access.Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the actual purpose of the 'stripe/charges/198' resource is entirely opaque. This is effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown
- —All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content
- —The specific purpose of /api/v1/stripe/charges/198 ('Premium API Access') is not explained anywhere
- —No examples of successful responses are available from crawled material
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/charges/198
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (USD Coin, version 2)https://lowpaymentfee.com/api/v1/stripe/charges/198
- —All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com