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/97` is listed as "Premium API Access" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme with no API keys, rate limits, or upfront commitments required.
The broader platform advertises four categories of endpoints: 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 share the same $0.02/request pricing. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found during crawling — the docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no substantive content.
The endpoint at `/api/v1/ach/97` is live and returning a valid x402 402 challenge. The path suggests it may relate to ACH (Automated Clearing House) banking functionality, but no documentation confirms what this specific endpoint does or what input it expects. Without schemas or examples, agents will need to experiment or obtain documentation out-of-band.
Capabilities
Use cases
- —Paying per-request for API access without managing API keys or subscriptions
- —Integrating x402-compatible agents with utility or financial data endpoints
- —Accessing ACH-related functionality via crypto micropayments
Fit
Best for
- —Developers building x402-native agent workflows on Base
- —Projects needing keyless, pay-as-you-go API access
- —Crypto-native applications that prefer on-chain settlement
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who need bulk pricing or rate guarantees
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/97 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documentation, no example requests or responses, and the specific function of /api/v1/ach/97 is unclear. The docs/pricing/README pages are all empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The purpose of /api/v1/ach/97 is undocumented — 'Premium API Access' is generic
- —All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no content
- —No example request or response payloads are available to confirm endpoint behavior
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02 per requesthttps://lowpaymentfee.com/api/v1/ach/97
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Four categories of endpoints are listed: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com