Mortgage data API endpoint on Base, pay-per-call via x402 with USDC.
What it does
This endpoint at lowpaymentfee.com provides access to mortgage-related data at the path `/api/v1/mortgages/25`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated via the x402 payment protocol on the Base network using USDC.
The specific endpoint `/api/v1/mortgages/25` is listed under "Premium API Access" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is settled on-chain to the provider's wallet. No API keys or rate limits are advertised; access is granted immediately upon valid x402 payment.
Documentation is extremely sparse. The crawled docs, pricing, and API pages all returned only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the exact request body format and response structure for mortgage data are unknown. The resource path suggests it may return data for a specific mortgage identified by ID 25, but this is speculative.
Capabilities
Use cases
- —Retrieving mortgage data or calculations programmatically with per-request crypto payment
- —Integrating mortgage information into agent workflows without managing API keys
- —Accessing financial data endpoints via x402 protocol on Base
Fit
Best for
- —Developers or agents needing on-demand mortgage data with crypto-native payment
- —x402-compatible agents that settle payments in USDC on Base
- —Use cases where keyless, pay-per-call access to financial data is preferred
Not for
- —Users who need detailed documentation or well-defined schemas before integration
- —High-volume mortgage data consumers who need bulk pricing or subscription plans
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/25 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The mortgage-specific functionality is entirely opaque — only the path and generic 'Premium API Access' description exist. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, API, and README pages all return only a 'Connect wallet' prompt with no technical content.
- —No OpenAPI or schema definition found; request body format and response structure are unknown.
- —The endpoint path '/api/v1/mortgages/25' is not listed on the provider's homepage among their advertised APIs, raising questions about whether it is a production endpoint or a test/demo resource.
- —Mortgage data may be subject to financial data regulations depending on jurisdiction.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network.https://lowpaymentfee.com/api/v1/mortgages/25
- —The platform advertises $0.02 per request, no API keys, no rate limits, instant access, on Base network.https://lowpaymentfee.com
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/mortgages/25