{"id":"cbc7d72b-97fd-40a0-84e1-e178bd17eb4e","shortId":"b9fk3W","kind":"x402","title":"NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.","tagline":"NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.","description":"This x402-enabled endpoint at lowpaymentfee.com returns NFT metadata for token ID 13 via a POST request. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact-payment scheme. The price per call is $0.02 (maxAmountRequired of 20,000 base units at 6 decimals).\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints on the platform are advertised at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint `/api/v1/nfts/13/metadata` serves NFT metadata as JSON. No OpenAPI schema or detailed documentation about the request body or response structure is available, so the exact fields returned are unknown. The endpoint responded with a valid x402 challenge (HTTP 402) confirming it is live and accepting payments.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT info endpoint","x402 NFT","Base USDC API","pay-per-call NFT","on-chain metadata"],"warnings":["No OpenAPI or schema documentation available for request or response bodies","Crawled /api, /pricing, and /README pages returned no useful content (only 'Connect wallet')","Endpoint is scoped to a single NFT token ID (13); unclear if other IDs are available at different paths","No information about uptime guarantees, rate limits, or data freshness"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/13/metadata","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/nfts/13/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (valid 402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response fields, no example payloads, and the crawled pages beyond the homepage returned only 'Connect wallet' with no useful content. The endpoint is narrowly scoped to a single NFT token ID with no explanation of what metadata is returned.","verified":false,"liveness":"unknown","lastLivenessCheck":null,"agentReviews":{"count":0,"score_avg":null,"cost_usd_avg":null,"success_rate":null,"latency_p50_ms":null,"narrative_summary":null,"summary_updated_at":null},"enrichmentModel":"anthropic/claude-opus-4.6","enrichmentVersion":2,"enrichedAt":"2026-04-21T23:20:16.628Z","embedding":[-0.01751709,-0.016906738,0.05328369,-0.013618469,-0.00064468384,-0.022155762,0.000008106232,0.015075684,0.024551392,-0.05316162,0.019119263,-0.012504578,-0.04940796,-0.07092285,-0.013755798,0.008911133,-0.008346558,-0.0028190613,-0.042633057,0.042541504,0.03414917,-0.0079956055,-0.013679504,0.021774292,-0.02319336,-0.01890564,-0.040924072,-0.0055656433,0.0059013367,0.009933472,0.02708435,-0.016494751,-0.006008148,0.015899658,-0.031951904,-0.00062179565,0.0059661865,0.00015211105,-0.0011816025,-0.025161743,0.0014247894,-0.050079346,0.017105103,-0.0065345764,-0.030929565,-0.036132812,-0.0046539307,-0.00048589706,0.017166138,0.009292603,-0.015159607,-0.017608643,-0.010856628,0.014511108,-0.0027103424,0.035980225,0.0021648407,-0.003540039,0.016647339,0.01550293,0.022644043,-0.07183838,-0.00957489,0.019363403,-0.018737793,0.049468994,-0.033294678,0.033325195,-0.0031528473,0.0637207,0.038879395,0.06628418,0.016540527,0.0013771057,0.015098572,-0.04663086,-0.0008945465,0.062805176,-0.04421997,-0.053588867,-0.0132751465,-0.009284973,-0.05178833,-0.011436462,-0.02545166,-0.02609253,-0.0052948,0.006038666,-0.031921387,0.04031372,-0.08666992,0.00047564507,-0.014709473,0.009147644,-0.0051727295,-0.009124756,-0.015655518,0.00497818,0.023620605,0.016342163,-0.026901245,-0.00390625,0.004737854,-0.009979248,0.013168335,0.03515625,0.031463623,0.02986145,-0.006160736,-0.012252808,-0.049560547,0.005088806,-0.0084991455,-0.033172607,0.003206253,0.006778717,-0.0463562,0.046051025,-0.016403198,0.042663574,-0.04437256,0.04156494,-0.0046310425,-0.0027675629,-0.008529663,-0.035186768,-0.02104187,0.027694702,-0.000600338,0.0058517456,0.03793335,-0.0038547516,0.01486969,-0.014587402,-0.03955078,-0.011817932,-0.04336548,-0.055603027,-0.040222168,-0.011680603,0.006790161,-0.013175964,0.02355957,0.03479004,-0.093566895,-0.008628845,-0.036712646,0.026397705,-0.028533936,0.009185791,-0.005504608,0.032806396,-0.00737381,-0.030929565,0.011444092,-0.04449463,0.024978638,0.005367279,-0.004749298,0.06518555,0.0056762695,0.013420105,0.024368286,-0.005874634,0.051086426,0.035705566,0.010627747,-0.06958008,-0.06451416,-0.0045204163,0.014183044,-0.022888184,-0.00031208992,-0.0013227463,-0.0074157715,-0.046661377,0.0068626404,-0.030914307,0.016647339,-0.03878784,-0.0076026917,-0.0501709,-0.0065231323,0.021270752,-0.059326172,-0.022109985,-0.027160645,0.084350586,0.04043579,0.039733887,-0.012008667,0.02331543,0.03564453,0.026824951,-0.036895752,-0.02748108,0.012458801,-0.03390503,0.028503418,-0.012123108,0.040863037,-0.00077962875,0.028411865,0.05886841,-0.0064735413,-0.0032367706,-0.02973938,-0.08520508,-0.0491333,0.00074100494,0.030227661,0.01108551,0.0063209534,0.021148682,-0.030883789,-0.01322937,0.007881165,0.0076026917,0.0049476624,0.02609253,0.0043144226,-0.014472961,0.0340271,0.01838684,-0.046569824,0.025650024,0.0109939575,0.0026245117,-0.0019989014,-0.032684326,0.025100708,0.032043457,-0.0064735413,0.024398804,-0.028869629,0.006706238,-0.031311035,-0.013168335,0.0010051727,0.004020691,0.0011253357,-0.032714844,-0.018173218,0.016052246,-0.030929565,-0.011962891,-0.033233643,-0.066589355,0.028778076,0.044891357,0.006126404,0.012886047,-0.01737976,-0.040008545,-0.006263733,-0.06591797,0.04168701,0.066101074,-0.0053100586,-0.019317627,0.031433105,-0.016464233,-0.048797607,-0.009185791,-0.012550354,-0.062438965,0.007255554,-0.014099121,-0.042938232,0.009185791,0.0041542053,-0.00077295303,0.022567749,-0.043273926,-0.056396484,0.022827148,-0.0052261353,-0.0031661987,0.0001269579,-0.040100098,0.015525818,0.010360718,0.027893066,-0.009277344,-0.0055732727,-0.012626648,0.021072388,0.010101318,0.03488159,0.009254456,-0.0037956238,0.0041160583,0.016693115,-0.038970947,-0.023910522,-0.028564453,0.0680542,-0.048736572,0.0446167,-0.015113831,0.012214661,0.017959595,0.006164551,-0.045135498,0.0021686554,0.02330017,0.013839722,0.029586792,0.01108551,-0.031158447,0.023330688,0.07312012,-0.04071045,-0.017364502,0.018188477,0.007434845,0.03805542,-0.007648468,-0.052368164,-0.018615723,0.010551453,-0.04168701,0.041625977,-0.027328491,0.0010881424,-0.009712219,0.010131836,-0.00919342,-0.0070610046,-0.016067505,0.008903503,0.00080537796,0.018234253,-0.016342163,0.0039253235,0.015899658,0.005683899,-0.01461792,0.013053894,0.031280518,0.072753906,-0.02973938,-0.04156494,-0.03366089,-0.029678345,-0.00063943863,0.009475708,0.020599365,0.0048332214,0.04019165,-0.03201294,-0.013847351,0.029586792,0.0075798035,0.03552246,0.02772522,-0.008293152,-0.07006836,-0.030410767,-0.037078857,-0.035461426,0.037597656,0.035003662,-0.0057258606,0.06427002,-0.019973755,-0.030715942,-0.03765869,0.018432617,-0.06958008,-0.048065186,0.023620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'/request':16,32 '0.02':15,31,75,138 '000':79 '0x8335':61 '13':46 '20':78 '2913':62 '402':192 '6':83 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'accept':198 'advertis':136 'ai/ml':107 'analysi':110 'analyt':106 'api':103,143 'avail':175 'base':5,21,56,80 'base-network' 'bodi':170 'broader':91 'call':9,25,73 'challeng':190 'classif':112 'commit':151 'confirm':193 'contract':60 'convers':128 'data':105 'decim':84 'detail':165 'document':166 'embed':113 'enabl':36 'endpoint':3,19,37,86,131,154,184 'estim':122 'exact':67,178 'exact-pay':66 'exchang':117 'feed':116 'field':179 'finance/web3':114 'gas':121 'generat':129 'geocod':126 'http':191 'id':45 'infer':108 'infrastructur':124 'json':160 'key':144 'limit':147 'live':196 'lowpaymentfee.com':39,93 'maxamountrequir':76 'metadata':2,18,42,158 'minimum':150 'network':57 'nft':1,17,41,157 'nft-metadata' 'no-api-key' 'offer':95 'on-chain metadata' 'openapi':162 'part':88 'pay':7,23,100 'pay-per-cal':6,22 'pay-per-call NFT' 'pay-per-request':99 'payment':51,68,199 'per':8,24,72,101,139 'platform':92,134 'post':49 'price':71,115 'quot':120 'rate':118,146 'request':50,102,140,169 'respond':185 'respons':172 'return':40,180 'schema':163 'scheme':69 'sentiment':109 'serv':156 'settl':53 'span':104 'specif':153 'structur':173 'summar':111 'token':44,119 'token metadata' 'unit':81 'unknown':182 'usdc':13,29,59 'usdc-settlement' 'use':58 'util':125 'valid':127,188 'varieti':97 'via':10,26,47 'x402':11,27,35,65,189 'x402 NFT' 'x402-enabled':34 'x402-payment'","prices":[{"id":"03cf8c83-3418-4a81-b663-0189cc05a2ed","listingId":"cbc7d72b-97fd-40a0-84e1-e178bd17eb4e","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/nfts/13/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.584Z"}],"sources":[{"listingId":"cbc7d72b-97fd-40a0-84e1-e178bd17eb4e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/13/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.584Z","lastSeenAt":"2026-04-22T21:32:16.288Z"}],"details":{"listingId":"cbc7d72b-97fd-40a0-84e1-e178bd17eb4e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/13/metadata \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","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, maxAmountRequired 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/13/metadata"},{"claim":"All endpoints 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 contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/13/metadata"}],"useCases":["Retrieving NFT metadata for token ID 13 programmatically","Integrating NFT data into wallets or marketplaces without API key management","Agent-driven NFT metadata lookups with micropayment settlement"],"bestFor":["Agents or apps needing on-demand NFT metadata without subscription overhead","Developers exploring x402 pay-per-call patterns on Base","Low-friction access to NFT data with crypto-native payments"],"notFor":["Bulk retrieval of metadata across many NFT collections (only token 13 is exposed at this path)","Users who need fiat-only payment options","Applications requiring detailed OpenAPI documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.198Z"},"updatedAt":"2026-04-22T21:32:16.288Z"}}