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 specific path `/api/v1/accounts/137` appears to be one of many endpoints offered by the platform, which advertises a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request.
The endpoint is live and returns a valid x402 challenge (HTTP 402) requesting payment of up to 20,000 base units of USDC (0x8335…2913) on the Base network. Since USDC uses 6 decimals, this translates to $0.02 per call. Payment is made via the "exact" scheme to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a 300-second timeout. No API keys or rate limits are advertised; access is gated purely by per-request micropayment.
The specific functionality behind `/api/v1/accounts/137` is not documented beyond the label "Premium API Access." The broader platform lists endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — but no detailed documentation, request/response schemas, or examples were found in the crawl. The docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content.
Capabilities
Use cases
- —Accessing premium API endpoints without subscription or API key management
- —Making one-off paid API calls settled in USDC on Base
- —Agent-driven programmatic access to paid data or utility services
Fit
Best for
- —Developers wanting zero-commitment pay-per-use API access
- —AI agents that can settle x402 micropayments autonomously
- —Users who prefer crypto-native payment rails over traditional billing
Not for
- —Users needing detailed API documentation or guaranteed SLAs before purchasing
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/137 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no request/response schema, and no description of what /api/v1/accounts/137 actually returns. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No documentation found — docs, pricing, API, and README pages all return only 'Connect wallet' with no content.
- —The specific functionality of /api/v1/accounts/137 ('Premium API Access') is completely undocumented; it is unclear what data or service it provides.
- —No request or response schema available; callers cannot know what to send or expect back.
- —No OpenAPI spec, no examples, no error documentation.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/accounts/137
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/accounts/137
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com