{"id":"8cbf0bad-d060-40b2-82d1-8af73fd1c336","shortId":"vymjXD","kind":"x402","title":"x402-payable loan data endpoint on Base, settling per-request in USDC.","tagline":"x402-payable loan data endpoint on Base, settling per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a specific loan record (ID 53) via the x402 payment protocol. It accepts POST requests and returns JSON data after payment of up to $0.02 in USDC on the Base network. No API keys or accounts are required — callers attach an X-PAYMENT header with a signed USDC payment to receive the response.\n\nThe broader lowpaymentfee.com platform advertises a wide catalog of x402-gated APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto market data, and infrastructure utilities. All endpoints share the same $0.02-per-request pricing model with no rate limits or minimum commitments. However, the specific endpoint being listed here (/api/v1/loans/53) is not prominently documented on the site's landing page, and there is no detailed documentation describing the loan data schema, request parameters, or response format. The docs, pricing, and API pages all appear to require wallet connection and provide no additional textual content.\n\nThe endpoint is confirmed live: it returns a valid x402 version-1 challenge with an \"exact\" payment scheme, paying to address 0x1A2B…85F3 in USDC (contract 0x8335…2913) on Base. The maxAmountRequired of 20000 base units equals $0.02 given USDC's 6 decimals. Timeout is 300 seconds. Because the response schema and loan data fields are undocumented, agents should treat this as an exploratory endpoint until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","loan-data","json-response","per-request-pricing","no-api-key"],"categories":["finance","data"],"synonyms":["loan API","x402 loan endpoint","USDC pay-per-call","Base network API","crypto-paid API","loan record lookup","lowpaymentfee"],"warnings":["The /api/v1/loans/53 endpoint is not listed on the provider's landing page among advertised APIs — its purpose and data schema are unknown.","No documentation is available: docs, pricing, API, and README pages all render only a wallet-connect prompt with no content.","Response schema is completely undocumented; agents cannot predict the shape of returned data.","The broader platform lists many endpoint categories but none appear to have public documentation beyond the landing page tiles."],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/53","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation for the /api/v1/loans/53 path — no request schema, no response schema, no description of what loan data is returned. The docs/pricing/API pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/loans/53':146 '0.02':60,126,228 '0x1a2b':212 '0x8335':217 '20000':224 '2913':218 '300':236 '53':41 '6':232 '85f3':213 'Base network API' 'USDC pay-per-call' 'accept':48 'access':34 'account':71 'addit':188 'address':211 'advertis':94 'agent':248 'ai/ml':106 'analysi':109 'analyt':105 'api':68,102,177 'appear':180 'attach':75 'base':8,22,65,220,225 'base-network' 'broader':91 'caller':74 'catalog':97 'challeng':203 'classif':111 'commit':138 'confirm':194 'connect':184 'content':190 'contract':216 'crypto':115 'crypto-paid API' 'data':5,19,54,104,117,166,244 'decim':233 'describ':163 'detail':161 'doc':174 'document':150,162,258 'embed':112 'endpoint':6,20,30,122,142,192,255 'equal':227 'exact':206 'exploratori':254 'field':245 'financ':113 'format':172 'gate':101 'given':229 'header':80 'howev':139 'id':40 'infer':107 'infrastructur':119 'json':53 'json-response' 'key':69 'land':155 'limit':135 'list':144 'live':195 'loan':4,18,38,165,243 'loan API' 'loan record lookup' 'loan-data' 'lowpaymentfee' 'lowpaymentfee.com':32,92 'market':116 'maxamountrequir':222 'minimum':137 'model':131 'network':66 'no-api-key' 'page':156,178 'paramet':169 'pay':209 'payabl':3,17 'payment':45,56,79,85,207 'per':11,25,128 'per-request':10,24,127 'per-request-pricing' 'platform':93 'post':49 'price':130,175 'promin':149 'protocol':46 'provid':33,186 'rate':134 'receiv':87 'record':39 'request':12,26,50,129,168 'requir':73,182 'respons':89,171,240 'return':52,197 'schema':167,241 'scheme':208 'second':237 'sentiment':108 'settl':9,23 'share':123 'sign':83 'site':153 'span':103 'specif':37,141 'summar':110 'surfac':259 'textual':189 'timeout':234 'treat':250 'undocu':247 'unit':226 'usdc':14,28,62,84,215,230 'usdc-settlement' 'util':120 'valid':199 'version':201 'via':42 'wallet':183 'wide':96 'x':78 'x-payment':77 'x402':2,16,44,100,200 'x402 loan endpoint' 'x402-gated':99 'x402-payable':1,15 'x402-payment'","prices":[{"id":"82205459-3618-4315-a0ec-05145c29f33e","listingId":"8cbf0bad-d060-40b2-82d1-8af73fd1c336","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:45.842Z"}],"sources":[{"listingId":"8cbf0bad-d060-40b2-82d1-8af73fd1c336","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:45.842Z","lastSeenAt":"2026-04-28T11:33:36.229Z"}],"details":{"listingId":"8cbf0bad-d060-40b2-82d1-8af73fd1c336","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/53 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 version-1 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/53"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/53"},{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Landing page lists data/analytics, AI/ML, finance/Web3, and infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving loan record data (ID 53) programmatically with per-call USDC payment","Integrating pay-per-request loan data into agent workflows without API key management","Exploring x402 protocol payment flows on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call data access on Base","Projects requiring on-chain settled API calls"],"notFor":["Production loan data pipelines requiring documented schemas and SLAs","Users without USDC on Base network","Bulk data retrieval where per-request fees add up quickly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.648Z"},"updatedAt":"2026-04-28T11:33:36.229Z"}}