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/49`. 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 gated via the x402 payment protocol on the Base network.
The specific endpoint `/api/v1/mortgages/49` accepts POST requests and returns JSON. Payment is settled in USDC on Base (contract 0x8335…2913) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals). The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each call. The payment timeout is 300 seconds.
Documentation beyond the landing page is extremely sparse: the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no explanation of what the `/mortgages/49` resource actually returns. The endpoint is live (returns a proper 402 challenge), but the exact request body format and response structure are unknown.
Capabilities
Use cases
- —Retrieving mortgage-related data for a specific record (ID 49)
- —Integrating mortgage information into financial dashboards or agent workflows
- —Programmatic access to mortgage data without API key registration
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
- —Prototyping x402 payment flows against a live endpoint
Not for
- —Users who need comprehensive mortgage market datasets in bulk
- —Anyone requiring detailed API documentation or guaranteed SLAs
- —Non-crypto users who cannot settle payments in USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/49 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no explanation of what the /mortgages/49 resource actually contains. The listing is effectively a stub with confirmed liveness.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README all return only a 'Connect wallet' prompt with no technical content.
- —No OpenAPI or schema definition found; request body format and response structure are completely unknown.
- —The specific resource '/mortgages/49' is not listed on the landing page among the advertised endpoints, raising questions about its purpose and data content.
- —The platform lists many endpoint categories but provides no verifiable detail on any of them.
Citations
- —The endpoint returns a valid x402 402 challenge with USDC on Base, maxAmountRequired 20000 (=$0.02)https://lowpaymentfee.com/api/v1/mortgages/49
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/mortgages/49