{"id":"2456414a-3ded-45d3-be06-fd2ba706ba24","shortId":"3UJYgm","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, settling in USDC at $0.02/request.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, settling in USDC at $0.02/request.","description":"This x402-enabled endpoint at lowpaymentfee.com provides a transaction receipt retrieval API. When called via POST at `/api/v1/transactions/334/receipt`, it returns a JSON receipt for the specified transaction. Payment is handled inline via the x402 protocol: the endpoint returns a 402 challenge requiring a USDC payment on the Base network before serving the response.\n\nThe specific endpoint probed charges a maximum of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request. The broader lowpaymentfee.com platform advertises a uniform $0.02/request pricing across a wide catalog of endpoints spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are x402-gated with no API keys, no rate limits, and no minimum commitments.\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 endpoint is live (402 challenge confirmed), but the actual response format and data content behind the paywall are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-call","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee"],"warnings":["No API documentation available — all doc/pricing/README pages render only 'Connect wallet'","No OpenAPI or schema definition found; request and response formats are unknown","The specific endpoint path includes a hardcoded transaction ID (334); unclear if this is parameterized or fixed","The broader platform advertises many endpoint categories (AI, finance, utils) but none could be verified beyond the 402 challenge"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/334/receipt","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/transactions/334/receipt","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 documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. No OpenAPI spec, no request/response schemas, no examples. The actual data returned behind the paywall is unknown, making this effectively a stub 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'/request':17,34,120 '0.02':16,33,109,119 '000':98 '0x8335':103 '20':97 '2913':104 '402':75,206 'Base network API' 'USDC micropayment API' 'across':122 'actual':211 'advertis':116 'ai/ml':131 'analysi':134 'analyt':130 'api':47,156,171 'avail':201 'base':9,26,83,99,106 'base-network' 'behind':217 'broader':113 'call':4,21,49 'catalog':125 'challeng':76,207 'charg':93 'classif':136 'commit':164 'confirm':208 'connect':180 'content':216 'convers':146 'data':129,140,215 'detail':187 'doc':170 'document':165,196 'embed':137 'enabl':38 'endpoint':7,24,39,72,91,127,149,203 'equal':108 'exampl':199 'extrem':167 'finance/crypto':138 'format':213 'gate':153 'generat':147 'geocod':144 'handl':65 'infer':132 'infrastructur':142 'inlin':66 'json':57 'json-response' 'key':157 'limit':160 'live':205 'lowpaymentfee' 'lowpaymentfee.com':41,114 'market':139 'maximum':95 'minimum':163 'network':84 'no-api-key' 'openapi':191 'page':175 'pay':2,19 'pay-per-cal':1,18 'pay-per-call' 'pay-per-request API' 'payload':200 'payment':63,80 'paywal':219 'per':3,20,110 'platform':115 'post':51 'price':121,172 'probe':92 'prompt':182 'protocol':70 'provid':42 'rate':159 'readm':174 'receipt':6,23,45,58 'render':177 'request':111 'request/response':194 'requir':77 'respons':88,212 'retriev':46 'return':55,73 'schema':195 'sentiment':133 'serv':86 'settl':12,29 'span':128 'spars':168 'spec':192 'specif':90 'specifi':61 'summar':135 'technic':186 'transact':5,22,44,62 'transaction receipt API' 'transaction-receipt' 'uniform':118 'unit':100 'unknown':221 'usdc':14,31,79,102 'usdc-settlement' 'util':143 'valid':145 'via':10,27,50,67 'wallet':181 'wide':124 'x402':11,28,37,69,152 'x402 payment endpoint' 'x402-enabled':36 'x402-gated':151 'x402-payment'","prices":[{"id":"adc5cc66-1d55-43d7-b6d9-d7d811ac51c2","listingId":"2456414a-3ded-45d3-be06-fd2ba706ba24","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/transactions/334/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:12.563Z"}],"sources":[{"listingId":"2456414a-3ded-45d3-be06-fd2ba706ba24","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/334/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:12.563Z","lastSeenAt":"2026-04-24T09:04:27.579Z"}],"details":{"listingId":"2456414a-3ded-45d3-be06-fd2ba706ba24","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/334/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to receive the receipt.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/transactions/334/receipt"},{"claim":"Platform advertises $0.02/request uniform pricing 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/transactions/334/receipt"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving transaction receipts programmatically with per-call USDC payment","Agent-driven workflows that need on-demand financial transaction data without pre-registration","Demonstrating x402 payment protocol integration for pay-per-use APIs"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that need keyless, on-demand API access settled in USDC on Base","Low-volume, pay-as-you-go transaction data retrieval"],"notFor":["Production workloads requiring documented request/response schemas","High-volume use cases where per-call crypto settlement overhead matters","Users who need detailed API documentation or SDKs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.56Z"},"updatedAt":"2026-04-24T09:04:27.579Z"}}