Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC, no API keys required.
What it does
This endpoint at `/api/v1/ach/135` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific function of the `/api/v1/ach/135` path is not documented — the listing title is simply "Premium API Access" and the endpoint sits under an `/ach/` path segment, which may relate to ACH (Automated Clearing House) banking or payment processing, but this is unconfirmed.
Pricing is $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). The platform advertises no API keys, no rate limits, no minimums, and instant access. Payment is made via the x402 `X-PAYMENT` header using the "exact" scheme. The USDC asset contract on Base is `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what data or functionality this specific endpoint returns. Prospective users should be aware that the actual behavior of `/api/v1/ach/135` is unknown beyond the x402 challenge metadata.
Capabilities
Use cases
- —Programmatic access to an ACH-related service with per-call USDC micropayments
- —Agent-driven payment workflows that settle on Base L2
- —Integrating pay-as-you-go financial endpoints without managing API keys
Fit
Best for
- —Developers wanting keyless, pay-per-request API access on Base
- —AI agents with USDC wallets needing on-demand financial endpoints
- —Prototyping x402 payment flows with low per-call costs
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume production workloads where $0.02/request adds up without bulk discounts
- —Anyone needing fiat-only payment rails with no crypto involvement
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/135 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this endpoint actually does, no request/response schema, and no examples. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —The specific functionality of /api/v1/ach/135 is completely undocumented — the 'ach' path segment is suggestive but unconfirmed.
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content.
- —No OpenAPI schema, no request/response examples, and no error documentation are available.
- —The '135' in the path may be a resource ID whose meaning is unknown.
Citations
- —Pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/ach/135
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/135
- —Platform offers APIs across data analytics, AI/ML, finance, crypto, and utility categorieshttps://lowpaymentfee.com