Pay-per-request ACH endpoint on Base via x402 — $0.02/call in USDC, no API keys required.
What it does
lowpaymentfee.com hosts a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/ach/15` is listed as "Premium API Access" and accepts POST requests. Payment is made per-call with no API keys, no rate limits, and no upfront commitments — each request costs $0.02 in USDC (maxAmountRequired of 20,000 base units at 6 decimals).
The broader platform advertises endpoints across several categories: 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 appear to share the same $0.02/request pricing model.
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 the `/api/v1/ach/15` endpoint actually returns or what input it expects beyond a POST body. The endpoint is live (returns a valid 402 x402 challenge), but without documentation it is unclear what data or functionality "Premium API Access" provides.
Capabilities
Use cases
- —Programmatic access to ACH-related data or functionality via a single micropayment per call
- —Agent-driven workflows that need keyless, pay-as-you-go API access on Base
- —Integrating low-cost per-request endpoints into automated pipelines without subscription overhead
Fit
Best for
- —Developers or agents wanting frictionless pay-per-call access without API key management
- —x402-compatible agents that can settle USDC payments on Base
- —Exploratory or low-volume usage where per-request pricing is preferable to subscriptions
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk pricing or rate-limited tiers
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/15 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation on what the endpoint does, what inputs it accepts, or what it returns. No OpenAPI schema, no examples, and the docs pages are empty. The listing is effectively a stub.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —The purpose and functionality of /api/v1/ach/15 ('Premium API Access') is completely undocumented; it is unclear what data or service it provides.
- —No request or response schema is available; integration requires trial-and-error.
- —No OpenAPI or machine-readable schema found.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/ach/15
- —All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/15
- —Docs, API, pricing, and README pages render only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs