{"id":"8f420230-a4ef-4e15-9d29-47426369ff38","shortId":"pveyVF","kind":"x402","title":"x402-gated loan data endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated loan data endpoint on Base, pay-per-request with USDC.","description":"This endpoint at lowpaymentfee.com provides access to a specific loan resource (loan ID 22) via the x402 payment protocol. The endpoint is live and returns a 402 challenge requiring payment in USDC on the Base network. The maximum amount required is 20,000 base units of USDC (6 decimals), which equates to $0.02 per request.\n\nThe hosting site lowpaymentfee.com offers a broad catalog of x402-gated APIs spanning data & analytics, AI/ML inference, finance & Web3, and infrastructure utilities — all priced at $0.02 per request. This particular endpoint (/api/v1/loans/22) is not listed on the site's main catalog page, so its exact response payload is unclear. The title \"Premium API Access\" and the path suggest it returns data about a specific loan entity, but no schema or example response is documented.\n\nPayment is handled entirely via the x402 protocol: no API keys, no rate limits, and no account registration. Callers attach an X-PAYMENT header with a signed USDC payment on Base. The endpoint accepts POST requests and returns application/json. The pay-to address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second payment timeout.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","loan-data","json-response","no-api-key"],"categories":["finance","data"],"synonyms":["loan API","loan data endpoint","x402 loan","USDC pay-per-call","Base network API","lowpaymentfee","micro-payment API","402 payment required"],"warnings":["No documentation available for /api/v1/loans/22 — endpoint is not listed in the site's public API catalog","No request or response schema provided; payload structure is unknown","Docs, pricing, API, and README pages all returned only 'Connect wallet' with no substantive content","The endpoint targets a hardcoded loan ID (22); unclear if other loan IDs are available or how to discover them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/22","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation for this specific loan endpoint — no request schema, no response schema, no examples. The crawled docs/pricing/API pages all returned only 'Connect wallet' with no useful content. The endpoint path (/api/v1/loans/22) is not listed in the site's public catalog, making its purpose and output 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'0.02':81,110 '000':71 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':205 '20':70 '22':42 '300':208 '402':55 '402 payment required' '6':76 'Base network API' 'USDC pay-per-call' 'accept':193 'access':34,138 'account':175 'address':203 'ai/ml':100 'amount':67 'analyt':99 'api':96,137,168 'application/json':198 'attach':178 'base':8,22,63,72,190 'broad':90 'caller':177 'catalog':91,125 'challeng':56 'data':5,19,98,145 'decim':77 'document':158 'endpoint':6,20,30,49,115,192 'entir':162 'entiti':150 'equat':79 'exact':129 'exampl':155 'financ':102 'gate':3,17,95 'handl':161 'header':183 'host':85 'id':41 'infer':101 'infrastructur':105 'json-response' 'key':169 'limit':172 'list':119 'live':51 'loan':4,18,38,40,149 'loan API' 'loan data endpoint' 'loan-data' 'lowpaymentfee' 'lowpaymentfee.com':32,87 'main':124 'maximum':66 'micro-payment API' 'network':64 'no-api-key' 'offer':88 'page':126 'particular':114 'path':141 'pay':10,24,201 'pay-per-request':9,23 'pay-to':200 'payload':131 'payment':46,58,159,182,188,210 'per':11,25,82,111 'post':194 'premium':136 'price':108 'protocol':47,166 'provid':33 'rate':171 'registr':176 'request':12,26,83,112,195 'requir':57,68 'resourc':39 'respons':130,156 'return':53,144,197 'schema':153 'second':209 'sign':186 'site':86,122 'span':97 'specif':37,148 'suggest':142 'timeout':211 'titl':135 'unclear':133 'unit':73 'usdc':14,28,60,75,187 'usdc-base' 'util':106 'via':43,163 'web3':103 'x':181 'x-payment':180 'x402':2,16,45,94,165 'x402 loan' 'x402-gated':1,15,93 'x402-payment'","prices":[{"id":"eeae5d06-ef55-493a-bffd-4db074a5f02c","listingId":"8f420230-a4ef-4e15-9d29-47426369ff38","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:24.006Z"}],"sources":[{"listingId":"8f420230-a4ef-4e15-9d29-47426369ff38","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:24.006Z","lastSeenAt":"2026-04-28T14:35:03.293Z"}],"details":{"listingId":"8f420230-a4ef-4e15-9d29-47426369ff38","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/22 \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\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 endpoint returns a 402 challenge requiring USDC payment on Base with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/loans/22"},{"claim":"The site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/22"}],"useCases":["Fetching loan details programmatically with per-request USDC micropayments","Integrating loan data into agent workflows without API key management","Accessing financial data via crypto-native pay-as-you-go billing"],"bestFor":["Agents or bots that need on-demand loan data without subscription commitments","Developers experimenting with x402 payment protocol integrations","Crypto-native applications on Base that want frictionless API access"],"notFor":["Users who need bulk loan data at scale (no documented batch endpoints)","Anyone without a Base-compatible USDC wallet","Use cases requiring detailed documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.754Z"},"updatedAt":"2026-04-28T14:35:03.293Z"}}