Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC
What it does
This endpoint at `/api/v1/ach/156` 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 protocol on the Base network, accepting USDC payments with no API keys, no rate limits, and no commitments required.
The specific endpoint `/api/v1/ach/156` is listed under the generic title "Premium API Access." The x402 challenge confirms it is live, accepting POST requests and settling payments in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The maximum amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02 per request. The payment timeout is 300 seconds.
However, the exact functionality of this particular endpoint (`/ach/156`) is unclear. It does not appear in the site's listed API categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure), and the description is simply "Premium API Access" with no further documentation. The docs, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. Without documentation or schema details, the actual input parameters and response format for this endpoint remain unknown.
Capabilities
Use cases
- —Programmatic access to an ACH-related service with per-call USDC micropayments
- —Agent-driven workflows needing keyless, pay-as-you-go API access on Base
- —Integrating low-cost API calls settled on-chain without subscription commitments
Fit
Best for
- —Developers wanting no-signup, pay-per-request API access
- —AI agents with x402-compatible wallets on Base
- —Users who prefer on-chain USDC settlement over traditional billing
Not for
- —Users needing detailed API documentation or guaranteed SLAs
- —Applications requiring known, well-documented input/output schemas
- —High-volume use cases where per-request crypto settlement adds overhead
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/156 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, and the purpose of '/api/v1/ach/156' is entirely undocumented. The docs, pricing, and README pages are empty beyond a wallet-connect prompt.
Warnings
- —The exact functionality of /api/v1/ach/156 is unknown — it is not listed among the site's documented API categories
- —No input parameters or response schema are documented anywhere
- —All documentation pages (docs, pricing, README, api) return only a 'Connect wallet' prompt with no content
- —The endpoint path suggests ACH (Automated Clearing House) functionality but this is unconfirmed
Citations
- —The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge shows maxAmountRequired of 20000 base units in USDC (6 decimals) = $0.02, with 300-second timeout on Basehttps://lowpaymentfee.com/api/v1/ach/156
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/156
- —Documentation pages return only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs