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/31` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network at $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The specific endpoint `/api/v1/ach/31` is listed under the generic title "Premium API Access" with no further documentation about what it returns or what input it expects. The path suggests it may relate to ACH (Automated Clearing House) banking data or operations, but this is speculative — the provider's landing page does not list this particular route among its documented API categories. The endpoint accepts POST requests and returns `application/json`.
Documentation on the site is extremely thin: the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples available. Prospective users should be aware that the actual functionality behind this endpoint is unclear and would need to be tested directly.
Capabilities
Use cases
- —Programmatic access to ACH-related data or operations via a single micropayment per call
- —Agent-driven workflows that need on-demand API access without pre-registration
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers experimenting with x402 pay-per-call patterns
- —AI agents that need keyless, on-demand API access settled in USDC
- —Users who want to avoid subscription commitments for occasional API calls
Not for
- —Users who need well-documented, production-grade ACH banking integrations
- —High-volume use cases where per-request pricing at $0.02 adds up significantly
- —Anyone requiring detailed API documentation or SLAs before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/31 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>" \
-d '{}'Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this specific endpoint does, no request/response schema, and the docs pages are empty. The 'Premium API Access' title is generic and uninformative.
Warnings
- —No documentation exists for this specific endpoint — its actual functionality is unknown
- —All docs/pricing/README pages on the site render only 'Connect wallet' with no content
- —The endpoint path '/api/v1/ach/31' is not listed among the provider's documented API categories
- —No OpenAPI spec, request schema, or response schema is available
- —The description 'Premium API Access' is generic and does not describe the endpoint's purpose
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/ach/31
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/ach/31
- —Docs, pricing, API, and README pages show only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs