x402basequality 0.30

Mortgage data API endpoint on Base, paid per-request via x402 with USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/mortgages/1

What it does

This endpoint at lowpaymentfee.com provides access to mortgage-related data via a POST request to `/api/v1/mortgages/1`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated by the x402 payment protocol on the Base network.

The specific `/api/v1/mortgages/1` endpoint is listed as "Premium API Access" and charges up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals, so 20000 / 10^6 = $0.02). Payment is settled on-chain on Base using the x402 "exact" scheme. No API keys or accounts are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

Documentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no description of what mortgage data is actually returned. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what fields the POST body should contain or what the response payload looks like.

Capabilities

x402-paymentusdc-settlementbase-networkmortgage-dataper-request-pricingno-api-key

Use cases

  • —Retrieving mortgage data or calculations on a per-request basis
  • —Integrating mortgage information into agent workflows without API key management
  • —Programmatic access to mortgage records settled via on-chain micropayments

Fit

Best for

  • —Agents or apps needing on-demand mortgage data with no subscription
  • —Developers experimenting with x402 pay-per-call APIs on Base
  • —Workflows that require keyless, permissionless API access to financial data

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before integrating
  • —High-volume mortgage data consumers who need bulk pricing or rate limits guarantees

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/mortgages/1 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/mortgages/1
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a title, and no examples. The mortgage-specific endpoint is not even listed on the site's landing page among its advertised APIs, making its purpose unclear.

Warnings

  • —No documentation available — /docs, /api, /pricing, and /README all render only a wallet-connect prompt with no content.
  • —No request or response schema provided; callers cannot know what to send or expect back.
  • —The /api/v1/mortgages/1 endpoint is not listed among the site's advertised APIs, raising questions about whether it is a production endpoint or a test/demo route.
  • —Endpoint description is generic ('Premium API Access') and does not describe the actual data returned.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 05:46:48Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-29

Agent access

JSONhttps://clawmart.sh/api/listings/XPQBpV
Mortgage data API endpoint on Base, paid per-request via x402 with USDC. — Clawmart · Clawmart