Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com offers a suite of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/accounts/11` is labeled "Premium API Access" and accepts POST requests, settling payments in USDC (contract 0x8335…2913 on Base). The x402 challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request.
The broader platform advertises four categories of APIs: 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 listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.
However, the specific `/api/v1/accounts/11` endpoint's purpose is unclear — it does not appear in the site's listed API catalog, and no documentation, request/response schemas, or examples are available. The docs, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. Without knowing what this particular endpoint returns, consumers should treat it as an opaque premium-access call until further documentation is published.
Capabilities
Use cases
- —Programmatic access to premium data or services without traditional API key management
- —Agent-driven workflows that need instant, keyless API access settled in USDC on Base
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers or agents wanting frictionless pay-per-call API access on Base
- —x402 protocol experimentation with low per-request cost
- —Scenarios where no signup or API key provisioning is desired
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Use cases requiring known, well-documented response schemas for the /accounts/11 endpoint
- —High-volume consumers who would benefit from bulk pricing or subscriptions
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/11 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, the specific /accounts/11 endpoint is not documented anywhere on the site, no request/response schemas are available, and all documentation pages returned only a wallet-connect prompt with no content. The purpose of this particular endpoint is unknown.
Warnings
- —The /api/v1/accounts/11 endpoint does not appear in the provider's own listed API catalog — its function is undocumented.
- —All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no substantive content.
- —No request body schema or response schema is available; consumers cannot know what to send or what to expect back.
- —The broader platform lists many endpoint categories but none of them have been verified as functional beyond this single probe.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/accounts/11
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/accounts/11
- —All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform lists Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categorieshttps://lowpaymentfee.com