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/181` 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/181` path is not documented — the listing title is simply "Premium API Access" and no schema, parameter descriptions, or example responses are provided. The "ach" path segment suggests it may relate to ACH (Automated Clearing House) banking or payment functionality, but this is speculative.
Pricing is $0.02 per request (the x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC, which at 6 decimals equals $0.02). Payment is made inline via the X-PAYMENT header using the x402 exact scheme — no API keys, accounts, or rate limits are advertised. The endpoint accepts POST requests and returns application/json.
Documentation is extremely thin. The /docs, /pricing, /api, and /README pages all resolve to a near-empty "Connect wallet" page with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The endpoint is live (returns a valid 402 challenge), but without documentation it is difficult to know what data to send or what response to expect.
Capabilities
Use cases
- —Programmatic access to an ACH-related service with per-request USDC micropayments
- —Agent-driven API consumption without pre-registration or API key management
- —Integrating pay-as-you-go endpoints into automated workflows on Base
Fit
Best for
- —Developers wanting zero-signup, pay-per-call API access
- —AI agents that can settle x402 payments on Base in USDC
- —Prototyping workflows that need instant, keyless API access
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —High-volume use cases where per-request pricing may add up without bulk discounts
- —Anyone needing non-crypto payment rails
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/181 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is essentially no documentation: no OpenAPI spec, no request/response schema, no parameter descriptions, and no examples. The purpose of the /api/v1/ach/181 path is unclear. All non-root pages returned only 'Connect wallet' with no content.
Warnings
- —The specific function of /api/v1/ach/181 is undocumented — the 'ach' path suggests ACH banking functionality but this is unconfirmed.
- —No request or response schema is available; callers cannot know what payload to send or what to expect back.
- —All documentation pages (/docs, /pricing, /api, /README) are effectively empty.
- —If this endpoint relates to real financial transactions (ACH transfers), it may be subject to financial regulation (KYC/AML).
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/ach/181
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/181
- —Documentation pages (/docs, /pricing, /api, /README) resolve to near-empty 'Connect wallet' pageshttps://lowpaymentfee.com/docs