Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/transactions/182` is listed as "Premium API Access" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, no subscriptions, no rate limits. Callers attach an X-PAYMENT header with a signed USDC payment to the payTo address and receive a JSON response.
The broader platform advertises four endpoint families: 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 the same $0.02/request price point.
However, the specific functionality behind `/api/v1/transactions/182` is not documented beyond the label "Premium API Access." The docs, pricing, and README pages all returned only a "Connect wallet" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl. The endpoint is confirmed live (returns a valid 402 challenge), but what data or service it actually returns upon successful payment is unknown.
Capabilities
Use cases
- —Accessing premium data or transaction information via a single paid API call
- —Agent-driven workflows that need keyless, per-request API access settled on-chain
- —Programmatic access to various data, AI, finance, or utility services without subscriptions
Fit
Best for
- —Developers who want zero-setup, pay-as-you-go API access
- —AI agents that can settle USDC payments on Base via x402
- —Users who prefer on-chain micropayments over traditional API key management
Not for
- —Users who need detailed documentation or guaranteed SLAs before purchasing
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/182 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' at /api/v1/transactions/182 is completely undocumented. All doc pages returned only 'Connect wallet' with no content.
Warnings
- —The specific functionality of /api/v1/transactions/182 ('Premium API Access') is not documented — it is unclear what data or service is returned upon payment.
- —All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.
- —No OpenAPI schema or request/response examples are available.
- —The endpoint path suggests a specific transaction record (ID 182) rather than a general-purpose API, but this is unconfirmed.
Citations
- —The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/transactions/182
- —All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transactions/182