{"id":"52eb2bd8-049f-4aea-aa6f-8704c1dec01d","shortId":"4CG2Hv","kind":"x402","title":"Pay-per-call loan data API on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call loan data API on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides access to a loan data resource (loan ID 41) via the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe provider lowpaymentfee.com hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are advertised at $0.02 per request with no API keys, no rate limits, and no minimum commitments. Payment is handled entirely through the x402 protocol on the Base L2 network.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific purpose and data shape of the /api/v1/loans/41 endpoint is unclear beyond its generic \"Premium API Access\" label. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is difficult to know what input it expects or what output it produces.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","loan-data","json-api"],"categories":["finance","data"],"synonyms":["loan API","x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no technical content.","No OpenAPI or schema definition found; request body format and response structure are unknown.","The specific data returned by /api/v1/loans/41 is undocumented; 'Premium API Access' is a generic label.","The provider lists many diverse API categories (AI, finance, infrastructure) at identical pricing, which may indicate placeholder or demo endpoints."],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/41","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/41","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 402 challenge with clear pricing. However, there is no OpenAPI spec, no documentation beyond a wallet-connect prompt, no request/response schema, and no examples. The purpose of '/api/v1/loans/41' is opaque — effectively a stub 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'/api/v1/loans/41':207 '/docs':167 '/pricing':169 '/readme':171 '/request':17,34 '0.02':16,33,84,135 '000':79 '0x8335':71 '20':78 '2913':72 '402':226 '41':48 '6':89 'Base network API' 'USDC pay-per-call' 'accept':55 'access':40,216 'advertis':133 'ai/ml':107 'analyt':106 'api':7,24,103,140,215 'avail':198 'base':9,26,66,80,159 'base-network' 'beyond':211 'broad':96 'call':4,21,102 'catalog':97 'challeng':227 'classif':111 'commit':148 'confirm':221 'connect':177 'contract':70 'convers':128 'cost':76 'crypto payment API' 'data':6,23,44,105,203 'decim':90 'detail':184 'difficult':233 'document':162,193,230 'embed':112 'endpoint':36,131,208,219 'entir':152 'equal':83 'estim':122 'exampl':196 'exchang':117 'expect':239 'extrem':164 'feed':116 'financ':113 'gas':121 'generat':129 'generic':213 'geocod':126 'handl':151 'host':94 'id':47 'infer':108 'infrastructur':124 'input':237 'json':60 'json-api' 'key':141 'know':235 'l2':160 'label':217 'limit':144 'live':222 'loan':5,22,43,46 'loan API' 'loan-data' 'lowpaymentfee' 'lowpaymentfee.com':38,93 'maximum':75 'micropayment API' 'minimum':147 'network':67,161 'openapi':188 'output':242 'page':172 'pay':2,19,100 'pay-per-cal':1,18,99 'pay-per-call' 'payload':197 'payment':52,61,149 'per':3,20,85,101,136 'post':56 'premium':214 'price':115 'produc':244 'prompt':179 'protocol':53,156 'provid':39,92 'purpos':201 'quot':120 'rate':118,143 'render':174 'request':57,86,137 'request/response':191 'resourc':45 'return':59,223 'schema':192 'sentiment':109 'settl':12,29,63 'shape':204 'span':104 'spars':165 'spec':189 'specif':200 'summar':110 'technic':183 'token':119 'unclear':210 'unit':81 'usdc':14,31,69,87 'usdc-settlement' 'use':68,88 'util':125 'valid':127,225 'via':10,27,49 'wallet':178 'web3':114 'without':229 'x402':11,28,51,155 'x402 API' 'x402-payment'","prices":[{"id":"330f6b5b-e144-42be-890c-1e930651bc61","listingId":"52eb2bd8-049f-4aea-aa6f-8704c1dec01d","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/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:41.611Z"}],"sources":[{"listingId":"52eb2bd8-049f-4aea-aa6f-8704c1dec01d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/41","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:41.611Z","lastSeenAt":"2026-04-28T11:33:35.986Z"}],"details":{"listingId":"52eb2bd8-049f-4aea-aa6f-8704c1dec01d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/41 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/loans/41"},{"claim":"USDC on Base network, maxAmountRequired 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/loans/41"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving loan data for a specific loan record via pay-per-call","Agent-driven data access without API key provisioning","Programmatic access to financial data with per-request USDC micropayments"],"bestFor":["Agents that need keyless, pay-per-call access to loan data","Developers experimenting with x402 payment protocol integrations","Use cases requiring no subscription or rate-limit constraints"],"notFor":["Production workloads requiring well-documented request/response schemas","Users who need bulk or batch loan data retrieval at scale","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.971Z"},"updatedAt":"2026-04-28T11:33:35.986Z"}}