{"id":"399daac0-263a-4fdc-8134-ced44a586eb8","shortId":"WAkQhj","kind":"x402","title":"Pay-per-call loan data endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call loan data endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at `/api/v1/loans/38` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. The specific resource at `/loans/38` is labeled \"Premium API Access\" and returns JSON data via HTTP POST. Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`).\n\nThe x402 challenge advertises a `maxAmountRequired` of 20000 base units. Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site-wide pricing of $0.02/request shown on the landing page. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The `/docs`, `/pricing`, `/api`, and `/README` pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no description of what the `/loans/38` resource actually returns. The endpoint path suggests loan-related financial data, but the exact payload structure is unknown. The broader site lists many endpoint categories (analytics, AI, finance, infrastructure) all at the same $0.02 price point, but none have published documentation beyond their listing titles.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","http-post"],"categories":["finance","data"],"synonyms":["loan data API","x402 micropayment API","USDC pay-per-call","lowpaymentfee","Base network API","crypto payment API","loan endpoint"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only a wallet-connect prompt","No request or response schema published; the actual data returned by /api/v1/loans/38 is unknown","The endpoint path '/loans/38' suggests a specific loan record but its meaning is undocumented","The site lists many diverse API categories (AI, analytics, finance, utils) all at $0.02 — unclear if all are fully implemented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/38","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/loans/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the /loans/38 resource accepts or returns. No OpenAPI spec, no request/response examples, and the docs pages are empty. The endpoint's purpose can only be guessed from its URL 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'/api/v1/loans/38':38 '/docs':163 '/loans/38':72,196 '/pricing':164 '/readme':167 '/request':17,34,126 '0.02':16,33,114,125,231 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':95 '20000':103 '6':109 'Base network API' 'USDC pay-per-call' 'access':77,143 'actual':198 'addit':178 'advertis':99,134 'ai':224 'ai/ml':61 'analyt':60,223 'api':57,76,136 'attach':146 'base':9,26,90,104 'base-network' 'beyond':239 'broader':217 'call':4,21 'caller':144 'categori':222 'challeng':98 'collect':48 'connect':173 'consist':117 'content':180 'contract':94 'crypto':64 'crypto payment API' 'data':6,23,59,81,208 'decim':110 'descript':192 'document':158,189,238 'endpoint':7,24,36,201,221 'exact':211 'extrem':160 'financ':63,225 'financi':207 'header':151 'http':83 'http-post' 'infer':62 'infrastructur':226 'instant':142 'json':80 'json-response' 'key':137 'label':74 'land':130 'limit':140 'list':219,241 'loan':5,22,205 'loan data API' 'loan endpoint' 'loan-rel':204 'lowpaymentfee' 'lowpaymentfee.com':43 'mani':220 'maxamountrequir':101 'network':91 'none':235 'offer':46 'openapi':184 'page':131,168 'part':40 'path':202 'pay':2,19,54 'pay-per-cal':1,18 'pay-per-request':53 'payload':212 'payment':85,150,156 'per':3,20,55,115 'platform':44,133 'point':233 'post':84 'premium':75 'price':123,232 'prompt':175 'proof':157 'protocol':52 'publish':237 'rate':139 'relat':206 'render':170 'request':56,116 'request/response':187 'resourc':70,197 'return':79,199 'schema':188 'servic':67 'settl':12,29,87 'shown':127 'simpli':145 'sinc':106 'site':121,218 'site-wid':120 'span':58 'spars':161 'spec':185 'specif':69 'structur':213 'suggest':203 'technic':179 'titl':242 'translat':112 'unit':105 'unknown':215 'usdc':14,31,93,107 'usdc-settlement' 'use':92,108 'util':66 'valid':154 'via':10,27,82 'wallet':174 'wide':122 'x':149 'x-payment':148 'x402':11,28,51,97,155 'x402 micropayment API' 'x402-payment' 'x402-protocol':50","prices":[{"id":"8ca01d71-99b4-4a33-91c6-8212680dea1e","listingId":"399daac0-263a-4fdc-8134-ced44a586eb8","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/loans/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:39.844Z"}],"sources":[{"listingId":"399daac0-263a-4fdc-8134-ced44a586eb8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:39.844Z","lastSeenAt":"2026-04-28T13:33:35.457Z"}],"details":{"listingId":"399daac0-263a-4fdc-8134-ced44a586eb8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/38 \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/38"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/38"}],"useCases":["Retrieving loan-related financial data on a per-request basis without API key registration","Programmatic access to premium data endpoints using x402 micropayments","Agent-driven workflows that need on-demand financial data with crypto settlement"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments on Base in USDC","Prototyping workflows that need instant access without rate limits"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.02Z"},"updatedAt":"2026-04-28T13:33:35.457Z"}}