Mortgage data 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/77`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network with no API keys, no rate limits, and no subscriptions required.
The specific endpoint `/api/v1/mortgages/77` is listed as "Premium API Access" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). This is consistent with the platform's uniform $0.02/request pricing shown on the landing page. Payment is made via the x402 `exact` scheme to the specified wallet address on Base.
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 mortgage data is returned. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what fields the response contains or what input the POST body expects.
Capabilities
Use cases
- —Retrieving mortgage-related data for a specific record (ID 77)
- —Integrating mortgage information into financial dashboards or agent workflows
- —Programmatic access to mortgage data without subscription or API key management
Fit
Best for
- —Agents or apps needing on-demand mortgage data with crypto micropayments
- —Developers who want keyless, pay-per-use API access on Base
- —Quick prototyping where subscription-free access is preferred
Not for
- —Users who need detailed API documentation or schema guarantees before integrating
- —Bulk mortgage data retrieval (no documented batch endpoints)
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/77 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is virtually no documentation: no OpenAPI schema, no request/response examples, no description of what mortgage data is returned, and all doc pages render only 'Connect wallet'. The endpoint path suggests a single fixed resource (ID 77) with unclear utility.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or JSON schema describing request body or response format
- —The endpoint path /api/v1/mortgages/77 references a specific ID; it is unclear whether other IDs are available or what data is returned
- —The mortgage endpoint is not listed on the landing page's catalog of available APIs, raising questions about its status
Citations
- —The platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/mortgages/77
- —Docs, API, pricing, and README pages render only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs