Mortgage data endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.
What it does
This endpoint at lowpaymentfee.com provides access to mortgage-related data via a pay-per-request x402 protocol. The specific resource `/api/v1/mortgages/42` appears to serve mortgage information (likely a specific mortgage record or calculation), payable in USDC on the Base network at $0.02 per request.
The provider operates a broader platform offering dozens of API endpoints across data & analytics, AI/ML, finance & Web3, and infrastructure categories — all priced uniformly at $0.02 per request. The x402 challenge confirms the endpoint is live, accepting POST requests, and settling payments on-chain via USDC (contract 0x8335…2913 on Base). No API keys or rate limits are advertised; access is granted purely through the x402 payment header.
Documentation is extremely sparse. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/mortgages/42` endpoint actually returns. The mortgage endpoint itself is not listed on the provider's homepage among the advertised APIs, making it unclear whether this is a production endpoint or a test/demo resource. Users should expect to experiment to discover the actual input and output format.
Capabilities
Use cases
- —Retrieving mortgage record or calculation data on demand
- —Integrating mortgage information into agent workflows without API key management
- —Pay-per-use access to financial data settled on Base L2
Fit
Best for
- —Agents needing on-demand mortgage data with crypto-native payment
- —Developers prototyping x402-based financial data integrations
- —Users who want keyless, pay-as-you-go API access
Not for
- —Production use requiring documented schemas and guaranteed SLAs
- —Bulk mortgage data retrieval at scale (no documented batch support)
- —Users who need fiat-only payment options
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/42 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the mortgage endpoint is not even listed among the provider's advertised APIs. Effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content
- —The /api/v1/mortgages/42 endpoint is not listed on the provider's homepage among advertised APIs; it may be a test or unlisted resource
- —No request or response schema is available; input/output format is unknown
- —No OpenAPI spec or ai-plugin manifest found
Citations
- —Endpoint returns 402 with x402 challenge accepting USDC on Base networkhttps://lowpaymentfee.com/api/v1/mortgages/42
- —All APIs priced at $0.02 per request with no API keys, no rate limitshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/mortgages/42
- —maxAmountRequired is 20000 base units; USDC uses 6 decimals so 20000/1e6 = $0.02https://lowpaymentfee.com/api/v1/mortgages/42