x402-gated API platform offering data, AI, finance, and utility endpoints at $0.02/request on Base.
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 `/api/v1/ach/146` is listed as "Premium API Access" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.
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 priced uniformly at $0.02 per request.
However, the specific functionality behind `/api/v1/ach/146` is not documented — the path suggests it may relate to ACH (Automated Clearing House) banking data or operations, but no schema, example request, or example response is available. The docs, pricing, and API pages all render only a "Connect wallet" prompt with no additional technical documentation. Without concrete documentation of what this endpoint accepts or returns, callers should treat this as an exploratory integration.
Capabilities
Use cases
- —Programmatic access to premium API data without managing API keys or subscriptions
- —Agent-driven workflows that need on-demand paid API calls settled in USDC on Base
- —Exploring ACH-related data or operations via a crypto-native payment rail
Fit
Best for
- —Developers who want zero-signup, pay-as-you-go API access
- —AI agents with x402-compatible wallets on Base
- —Users comfortable with crypto micropayments for API consumption
Not for
- —Users who need detailed API documentation and schemas before integrating
- —High-volume consumers who need bulk pricing or subscription discounts
- —Anyone requiring fiat-only payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/146 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>" \
-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 zero documentation on what /api/v1/ach/146 actually does, what inputs it accepts, or what it returns. The docs/pricing/API pages are all blank beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No documentation exists for /api/v1/ach/146 — the endpoint's purpose, input schema, and output schema are entirely unknown.
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content.
- —The 'ach/146' path hints at ACH banking operations which could involve regulated financial activity — exercise caution.
- —No OpenAPI spec, no example requests or responses available.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/ach/146
- —All endpoints are priced at $0.02 per 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 API categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/ach/146