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/120` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint is listed under "Premium API Access" but its exact functionality is unclear — the path suggests ACH (Automated Clearing House) banking-related data or operations, though no documentation describes the input/output schema. The platform advertises a uniform $0.02 per request pricing model across all endpoints.
The x402 challenge confirms the endpoint is live, accepting POST requests and requiring payment of up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call. Payment is made via the x402 "exact" scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or accounts are needed — access is granted purely through the x402 payment header.
The broader platform lists endpoints across data analytics, AI/ML (sentiment, summarization, classification, embeddings), finance (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). However, documentation pages beyond the landing page returned only "Connect wallet" with no substantive content, so the actual request/response schemas for this or any endpoint remain undocumented in the crawled material.
Capabilities
Use cases
- —Programmatic access to ACH-related data or operations with per-call USDC payment
- —Agent-driven financial workflows that need keyless, pay-as-you-go API access
- —Integrating low-cost banking or payment data into Web3 applications
Fit
Best for
- —Developers wanting keyless, pay-per-use API access settled in USDC on Base
- —AI agents that can autonomously pay for API calls via x402
- —Projects needing ACH-related functionality without subscription commitments
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 plans
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/120 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this endpoint actually does — no input schema, no output schema, no example requests or responses. The docs, pricing, and README pages all returned only 'Connect wallet' with no content. The endpoint path '/api/v1/ach/120' hints at ACH functionality but nothing is confirmed.
Warnings
- —No documentation available — all doc pages return only 'Connect wallet' with no content
- —The exact purpose and input/output schema of /api/v1/ach/120 are unknown
- —The endpoint name 'Premium API Access' is generic and does not describe functionality
- —Cannot verify what data or service is actually returned after payment
Citations
- —The endpoint returns a 402 x402 challenge requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/ach/120
- —Platform advertises $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/120
- —Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeouthttps://lowpaymentfee.com/api/v1/ach/120