x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402 protocol API marketplace that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/ach/93` is listed as "Premium API Access" and accepts POST requests. Payment is settled on-chain via USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals).
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 listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.
However, the specific functionality behind `/api/v1/ach/93` is unclear — the path suggests an ACH (Automated Clearing House) related resource, but this endpoint does not appear in the site's publicly listed API catalog. Documentation pages (/docs, /pricing, /README) returned only a "Connect wallet" prompt with no substantive content. Without an OpenAPI schema, request/response examples, or detailed documentation, the actual behavior of this endpoint remains unknown.
Capabilities
Use cases
- —Paying per-call for API access without managing API keys or subscriptions
- —Integrating on-chain micropayment-gated services into agent workflows
- —Accessing utility or financial endpoints with instant USDC settlement on Base
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing low-cost per-request pricing without rate limits
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume use cases where per-request on-chain settlement overhead matters
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/93 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific function of /api/v1/ach/93 is undocumented. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt.
Warnings
- —The endpoint path /api/v1/ach/93 does not appear in the site's publicly listed API catalog — its actual functionality is unknown.
- —No OpenAPI schema, request body schema, or response examples are available.
- —All documentation pages (/docs, /pricing, /README) returned only a 'Connect wallet' prompt with no content.
- —The 'ACH' path component may relate to regulated financial services (Automated Clearing House); verify compliance before use.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/ach/93
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/ach/93
- —All listed endpoints are priced at $0.02 per 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
- —Documentation pages returned only a Connect wallet prompthttps://lowpaymentfee.com/docs