{"id":"aef00e6f-5b3d-4e15-8499-192b9ea2bad6","shortId":"MkQDgN","kind":"x402","title":"x402-gated loan data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated loan data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a loan resource (ID 26) via the x402 payment protocol. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories, all priced at $0.02 per call and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/loans/26` is labeled \"Premium API Access\" in the x402 challenge. The challenge confirms the endpoint is live, accepts POST requests, and requires a payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to the specified payTo address, with a 300-second timeout. No API keys or rate limits are advertised; access is gated purely by micropayment.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no description of the loan data structure returned, and no example responses. The endpoint's exact output format and the meaning of the loan resource are unknown. The platform appears to be a demonstration or early-stage x402 API marketplace, but without further documentation it is difficult to assess the quality or reliability of the data returned.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","loan-data","pay-per-request","no-api-key"],"categories":["finance","data"],"synonyms":["loan API","x402 loan endpoint","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","402 payment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all return only a wallet-connect prompt","No OpenAPI or output schema provided; the structure of the loan data response is unknown","The purpose and content of /api/v1/loans/26 is not described anywhere in the crawled material","Platform may be a demo or early-stage project; reliability and data quality are unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/26","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/26","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 with clear pricing, but there is no documentation, no OpenAPI schema, no example responses, and no description of what the loan resource actually contains. Effectively a stub 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'0.02':10,24,70,123 '000':112 '0x8335':117 '20':111 '26':40 '2913':118 '300':144 '402 payment API' '6':127 'Base network API' 'USDC pay-per-call' 'accept':101 'access':34,89,155 'across':59 'address':141 'advertis':154 'ai/ml':62 'analyt':61 'api':58,88,148,168,228 'appear':218 'assess':238 'base':8,22,79,113,120 'base-network' 'broader':51 'call':72 'categori':66 'challeng':93,95 'confirm':96 'connect':177 'content':183 'crawl':166 'data':5,19,60,194,245 'decim':128 'demonstr':222 'descript':190 'difficult':236 'doc':167 'document':161,233 'earli':225 'early-stag':224 'endpoint':6,20,30,83,98,202 'equal':122 'exact':135,204 'exampl':199 'extrem':163 'finance/web3':63 'format':206 'gate':3,17,157 'given':124 'id':39 'infrastructur':65 'key':149 'label':86 'limit':152 'live':100 'loan':4,18,37,193,212 'loan API' 'loan-data' 'lowpaymentfee' 'lowpaymentfee.com':32 'made':131 'marketplac':229 'mean':209 'micropay':160 'micropayment API' 'network':80 'no-api-key' 'offer':53 'openapi':187 'output':205 'page':172 'part':48 'pay':9,23,55 'pay-per-request':54 'payment':44,107,129 'payto':140 'per':11,25,56,71 'platform':52,217 'post':102 'premium':87 'price':68,169 'prompt':179 'protocol':45 'provid':33 'pure':158 'qualiti':240 'rate':151 'readm':171 'reliabl':242 'request':12,26,57,103 'requir':105 'resourc':38,213 'respons':200 'return':174,196,246 'schema':188 'scheme':136 'second':145 'settl':74 'spars':164 'specif':82 'specifi':139 'stage':226 'structur':195 'substant':182 'timeout':146 'unit':114 'unknown':215 'usdc':14,28,76,116,125 'usdc-micropayment' 'via':41,132 'wallet':178 'without':231 'x402':2,16,43,92,134,227 'x402 loan endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"70b78bfc-2205-4cf7-88dc-7cd348395947","listingId":"aef00e6f-5b3d-4e15-8499-192b9ea2bad6","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/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:22.197Z"}],"sources":[{"listingId":"aef00e6f-5b3d-4e15-8499-192b9ea2bad6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:22.197Z","lastSeenAt":"2026-04-28T14:35:03.202Z"}],"details":{"listingId":"aef00e6f-5b3d-4e15-8499-192b9ea2bad6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/26 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/26"},{"claim":"All APIs on the platform are priced at $0.02 per request 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/26"}],"useCases":["Fetching loan data on-demand with per-request USDC micropayments","Integrating x402-compatible agents that pay for financial data automatically","Testing x402 payment protocol flows against a live endpoint"],"bestFor":["Developers experimenting with x402 micropayment protocol","AI agents that need pay-per-call access to loan data without API keys","Projects requiring low-friction, keyless API access on Base"],"notFor":["Production use cases requiring documented response schemas and SLAs","Users who need free or subscription-based API access","Applications needing detailed loan analytics or bulk data export"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.846Z"},"updatedAt":"2026-04-28T14:35:03.202Z"}}