Mortgage data endpoint on Base, pay-per-request via x402 with USDC.
What it does
This endpoint at `/api/v1/mortgages/47` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-call APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint appears to serve mortgage-related data (resource ID 47), though the exact response schema and input parameters are not documented in the available crawl material. The platform advertises a uniform $0.02 per request pricing model across its endpoints, and the x402 challenge confirms a maxAmountRequired of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) on Base.
The platform markets itself as requiring no API keys, no rate limits, and offering instant access. Payment is handled entirely through the x402 payment header mechanism — callers attach a payment proof to each request. The endpoint is live and returns a valid x402 challenge on POST requests. However, documentation 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 description of what mortgage data is returned or what parameters the endpoint accepts. The `/api/v1/mortgages/47` path is not listed among the endpoints on the homepage, making it unclear whether this is a production endpoint or a test/demo resource.
Capabilities
Use cases
- —Retrieving mortgage-related data for a specific resource ID
- —Integrating mortgage information into financial dashboards
- —Agent-driven mortgage data lookups with micropayments
Fit
Best for
- —Developers wanting keyless, pay-per-call mortgage data access
- —AI agents that can settle x402 payments on Base
- —Prototyping financial applications with low per-request costs
Not for
- —Users needing well-documented, schema-validated mortgage APIs
- —Bulk mortgage data retrieval (no documented batch endpoints)
- —Anyone unable to pay with USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/47 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and the specific mortgages/47 path is not listed on the provider's homepage. It is effectively a stub listing with minimal verifiable information about what data is actually returned.
Warnings
- —No OpenAPI spec or schema available for this endpoint
- —The /api/v1/mortgages/47 path is not listed among the provider's advertised endpoints on the homepage
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no content
- —Unknown request parameters and response format — no examples available
- —Unclear whether this is a production endpoint or a test/demo resource
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/mortgages/47
- —The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/mortgages/47