Pay-per-request ACH endpoint on Base via x402 — $0.02/call in USDC, no API keys required.
What it does
This endpoint at `/api/v1/ach/57` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML, finance & Web3, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The pricing model is flat at $0.02 per request with no API keys, no rate limits, and no minimum commitments.
The specific endpoint `/api/v1/ach/57` is listed under the title "Premium API Access" but its exact functionality is unclear from the available documentation. The path segment "ach" suggests it may relate to ACH (Automated Clearing House) payment processing or financial data, and "57" appears to be a resource identifier. However, the crawled docs pages returned only "Connect wallet" prompts with no further technical detail, so the precise input/output behavior cannot be confirmed.
Payment is handled via the x402 exact scheme: callers must include an X-PAYMENT header with a USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals) to the address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The endpoint accepts POST requests and returns `application/json`. The x402 challenge was successfully captured, confirming the endpoint is live.
Capabilities
Use cases
- —Accessing ACH-related financial data or payment functionality on a per-call basis
- —Integrating pay-per-use financial endpoints into agent workflows without managing API keys
- —Programmatic access to payment infrastructure settled in USDC on Base
Fit
Best for
- —Developers wanting zero-setup, keyless API access with crypto micropayments
- —AI agents that can settle x402 payments autonomously
- —Projects needing low-cost per-request financial data without subscriptions
Not for
- —Users who need detailed API documentation before integrating — docs are currently sparse
- —High-volume use cases where a subscription model would be more cost-effective
- —Users without USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/57 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base), but the endpoint's actual functionality is undocumented. No OpenAPI schema, no request/response examples, and all docs pages returned only 'Connect wallet' with no content. The 'ach/57' path and 'Premium API Access' title provide minimal clues about what the endpoint actually does.
Warnings
- —Endpoint functionality is unknown — 'ach/57' path and 'Premium API Access' title are the only clues; no documentation describes inputs or outputs.
- —All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no usable content.
- —The platform lists many API categories (AI, analytics, finance, utilities) but this specific endpoint's category and behavior are unconfirmed.
- —Possible financial/payments domain — may be subject to regulatory requirements depending on jurisdiction.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/ach/57
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/ach/57
- —Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com