{"id":"ce93e489-1125-4a97-99de-f648dccdb3d7","shortId":"f4vqbd","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/payments/372` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe wider platform advertises four endpoint categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 usage examples available from the crawled material. The x402 challenge confirms the endpoint is live and accepts POST requests returning application/json, but the actual request body format and response structure for this specific endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","serverless api","no-auth api"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available — request and response formats are unknown","The specific purpose of /api/v1/payments/372 ('Premium API Access') is not explained anywhere in the crawled material","The broad catalog of endpoints (AI, finance, data, utils) is advertised but none have documented input/output contracts"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/372","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/payments/372","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and settlement details, but documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. No OpenAPI spec, no request/response schemas, and no examples are available. The endpoint's actual functionality behind 'Premium API Access' is unclear.","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":"2026-04-19T07:19:34.719Z","embedding":[-0.0284729,-0.028213501,0.041534424,0.014076233,0.013679504,-0.029724121,-0.028640747,0.02407837,0.07543945,-0.06762695,0.027557373,-0.059448242,-0.027893066,-0.035491943,-0.022232056,0.008956909,-0.0009918213,0.004180908,-0.030532837,0.03189087,0.011169434,-0.020370483,-0.038604736,0.016418457,-0.0062408447,-0.021728516,-0.00011461973,-0.008041382,-0.032592773,-0.04663086,0.049316406,-0.02557373,-0.0099105835,0.0006661415,-0.010810852,-0.005207062,-0.00881958,0.03112793,0.022201538,-0.0031642914,-0.013885498,-0.06121826,0.00047588348,-0.023376465,-0.062072754,-0.010322571,0.0181427,-0.01777649,0.0075950623,0.00094270706,-0.045013428,-0.007549286,-0.006614685,0.014785767,0.007347107,0.012718201,0.0041122437,-0.0060157776,0.015457153,0.009918213,0.00034952164,-0.055786133,-0.017486572,-0.0065231323,-0.006690979,0.050598145,-0.010887146,0.054351807,0.0034999847,0.06188965,0.037139893,0.042297363,0.025024414,0.01210022,0.0070114136,-0.005973816,-0.0067749023,0.06524658,-0.0149002075,-0.027923584,-0.01676941,-0.0154418945,-0.054351807,-0.010948181,-0.012008667,-0.04815674,-0.021972656,0.018371582,-0.031341553,0.04437256,-0.074279785,-0.01525116,-0.0078048706,0.007347107,0.006198883,-0.012611389,-0.005886078,0.016036987,0.0011968613,0.01940918,-0.0071868896,-0.04147339,0.013076782,0.012649536,0.037017822,0.04321289,0.01675415,0.012527466,0.013267517,-0.00642395,-0.052001953,0.0070724487,-0.011360168,-0.007888794,0.0041503906,0.014076233,-0.010498047,0.013717651,-0.02923584,-0.0021152496,-0.04547119,0.05593872,0.013458252,0.0138168335,0.012260437,-0.05154419,-0.030044556,0.01008606,-0.029006958,-0.015327454,0.010513306,0.008872986,0.027053833,-0.011940002,-0.031036377,0.010627747,-0.015213013,-0.0079956055,-0.04296875,-0.040222168,0.044006348,-0.026367188,0.018829346,0.03466797,-0.099609375,-0.013031006,-0.03353882,0.00415802,-0.02810669,-0.0028324127,-0.0028419495,0.026382446,-0.019424438,-0.018371582,-0.024337769,-0.018661499,-0.008995056,0.027954102,-0.018600464,0.039123535,-0.026535034,0.030456543,0.024353027,0.0010490417,0.019500732,0.026184082,-0.012336731,-0.09527588,-0.08746338,-0.015548706,-0.0037670135,-0.029129028,-0.027954102,0.0048713684,-0.012252808,-0.06341553,-0.0060043335,-0.0046844482,-0.0036621094,-0.049316406,-0.0053100586,-0.026733398,0.010864258,-0.010612488,-0.050323486,-0.024993896,-0.03062439,0.06707764,0.028823853,0.030731201,0.024597168,-0.0099487305,0.06011963,0.03213501,-0.008331299,-0.017791748,0.01876831,-0.018447876,0.017852783,-0.013442993,0.017990112,-0.036010742,0.04058838,0.0703125,0.009689331,-0.020706177,-0.016983032,-0.060272217,-0.05105591,-0.034698486,0.025299072,0.006954193,-0.0019483566,0.038635254,-0.035583496,-0.032196045,-0.0103302,0.013900757,0.010894775,0.065979004,0.02116394,-0.0028057098,0.026992798,0.018753052,-0.05227661,0.029876709,0.025238037,0.010810852,-0.020980835,-0.028884888,0.032348633,0.035827637,-0.022109985,0.03112793,-0.018478394,0.026382446,-0.014373779,0.003484726,0.010826111,-0.005619049,-0.019088745,-0.025009155,-0.036346436,0.02281189,0.0068855286,-0.022033691,-0.029052734,-0.08557129,0.050842285,0.02003479,0.039794922,-0.017578125,0.010246277,-0.025238037,-0.006866455,-0.08239746,0.0569458,0.076293945,0.0019798279,-0.014564514,0.020965576,0.0035743713,-0.01739502,0.009490967,-0.011238098,-0.03881836,-0.022354126,0.011199951,-0.0491333,-0.0076828003,0.024093628,0.030532837,0.052764893,-0.009567261,-0.051513672,-0.010620117,-0.014801025,-0.011779785,-0.035491943,-0.00056648254,-0.012916565,0.017959595,0.03086853,0.0074501038,0.0141067505,-0.0012073517,-0.0028762817,-0.0079193115,0.009666443,-0.014785767,-0.025100708,0.019638062,0.0011777878,-0.056884766,0.011436462,-0.010940552,0.07293701,-0.042144775,0.038482666,-0.010032654,0.01914978,0.041503906,-0.0034484863,-0.048187256,0.008415222,0.030136108,0.00920105,0.044067383,0.0056037903,-0.036590576,-0.016784668,0.06890869,-0.005268097,-0.0007777214,0.0007100105,0.0126953125,0.033050537,-0.0087509155,-0.062927246,-0.039916992,0.0025920868,-0.028625488,0.031707764,-0.012901306,0.016662598,-0.014633179,0.010505676,-0.029754639,-0.0005016327,-0.022567749,0.014442444,-0.014595032,0.0058288574,0.003080368,-0.019958496,0.018722534,0.01675415,-0.009498596,0.0009698868,0.039031982,0.020324707,-0.015625,-0.025390625,-0.033996582,-0.008308411,-0.0184021,0.01260376,0.027053833,0.025970459,0.05307007,-0.026687622,0.0009531975,0.022735596,0.010948181,0.038970947,-0.008323669,-0.00091695786,-0.082458496,-0.04623413,-0.032989502,-0.033294678,0.023895264,0.02394104,-0.0042686462,0.057128906,0.006038666,-0.031585693,-0.037994385,0.027404785,-0.041778564,0.0002501011,0.036315918,-0.005596161,-0.02406311,0.0021076202,-0.019973755,0.0033493042,0.044128418,0.011207581,0.024490356,0.075805664,0.036010742,0.005584717,0.017074585,0.004119873,0.031677246,0.013664246,-0.011314392,-0.021743774,-0.0090789795,0.03945923,-0.022140503,-0.03149414,-0.06677246,0.068359375,0.04058838,0.0736084,0.0060806274,0.0041542053,0.03414917,-0.020263672,0.006839752,-0.026306152,-0.021057129,-0.017974854,-0.0423584,0.041900635,-0.01651001,0.010543823,-0.016586304,0.050079346,-0.009552002,0.0152282715,-0.017944336,0.039855957,-0.01687622,0.006679535,0.015136719,0.0096588135,0.05847168,0.06427002,-0.05041504,0.023406982,0.013267517,-0.0395813,0.010482788,0.03768921,-0.011276245,-0.014129639,-0.05657959,-0.027435303,-0.007987976,-0.00036501884,-0.05178833,-0.002401352,0.015144348,0.022354126,0.034179688,-0.008842468,-0.00283432,-0.020324707,-0.014450073,-0.06213379,0.0024261475,-0.04421997,-0.010169983,0.03488159,-0.026641846,-0.008522034,-0.00032639503,-0.0005812645,-0.0042495728,0.014656067,0.0446167,-0.0017271042,-0.046813965,0.03781128,0.008995056,0.0065727234,0.008811951,0.039489746,0.020629883,0.024139404,0.04928589,0.008712769,-0.0151901245,-0.06463623,0.02520752,-0.05569458,0.0053367615,0.013305664,-0.024368286,0.0042266846,-0.0076789856,-0.04296875,-0.03250122,0.009063721,-0.019744873,-0.0005187988,0.010421753,-0.018157959,-0.03488159,-0.056884766,-0.017166138,0.0051574707,0.061767578,0.013977051,-0.00070667267,-0.054779053,-0.0056381226,0.019302368,0.0017051697,0.043701172,-0.014038086,-0.021957397,-0.019546509,-0.03668213,-0.004776001,-0.026809692,0.0368042,-0.009986877,-0.006084442,0.016052246,0.0129852295,0.020874023,0.007598877,0.0032577515,0.009635925,-0.035003662,-0.009056091,-0.0027103424,0.04623413,0.018676758,-0.009613037,-0.034332275,0.0418396,0.013183594,0.03515625,-0.03289795,-0.008155823,-0.009414673,0.0110321045,0.019577026,-0.0121536255,-0.014450073,-0.010116577,-0.05126953,-0.04714966,0.034057617,-0.010787964,0.023330688,0.032226562,0.0045204163,0.015853882,-0.016586304,0.01776123,0.017410278,-0.027145386,-0.00730896,-0.028182983,-0.035858154,-0.023635864,-0.0062332153,-0.018844604,0.02709961,-0.01525116,0.012321472,0.00058174133,-0.020690918,0.022827148,0.016159058,-0.0102005005,0.019241333,0.0079422,0.027893066,0.04724121,0.0084991455,-0.043395996,0.022277832,-0.008178711,0.013328552,-0.0071754456,0.041412354,0.03878784,-0.00944519,-0.009643555,-0.0070343018,-0.018814087,-0.026809692,0.007873535,-0.0034675598,0.014167786,-0.010185242,-0.056152344,0.01689148,0.011001587,-0.028442383,-0.02885437,0.019058228,0.008995056,-0.037200928,0.020355225,0.018493652,0.05718994,-0.02331543,0.0060043335,0.010894775,0.040496826,0.03378296,0.0035705566,0.0012159348,0.015945435,-0.0043678284,0.007045746,-0.00617218,-0.0021648407,0.021713257,0.001871109,0.022903442,0.025314331,0.011787415,-0.024475098,-0.029571533,0.0061035156,-0.011878967,-0.030197144,0.030273438,0.01689148,0.020401001,-0.028900146,0.021636963,0.014465332,-0.010368347,-0.008872986,-0.001531601,0.027694702,-0.018188477,-0.018981934,0.025146484,0.0056648254,0.02722168,-0.05178833,-0.0126953125,0.007987976,0.020095825,-0.030715942,-0.049804688,-0.04473877,0.0010471344,0.031799316,0.009994507,0.028030396,0.036834717,0.0007138252,0.011329651,0.027877808,0.0075302124,-0.020401001,-0.015098572,-0.04928589,-0.029037476,-0.0050621033,0.010063171,-0.039978027,0.018295288,-0.00409317,-0.031204224,0.0035190582,-0.012535095,-0.0087890625,-0.009361267,0.0059890747,0.034698486,0.0005726814,0.019699097,-0.019073486,-0.03604126,-0.010284424,0.00010287762,0.02468872,-0.058380127,0.017288208,-0.009674072,-0.0044288635,-0.0051002502,0.018707275,0.02218628,0.032470703,0.014480591,0.03237915,-0.042755127,0.04849243,-0.036224365,0.025939941,0.005973816,-0.043548584,-0.011810303,-0.035705566,-0.013946533,0.037353516,-0.026321411,-0.009742737,-0.03643799,-0.033843994,-0.017181396,-0.058166504,0.01600647,0.03942871,0.046295166,-0.026184082,0.00881958,-0.0019302368,0.0063285828,-0.018661499,0.0011873245,-0.0049591064,0.016952515,0.027282715,0.0024757385,-0.017578125,-0.035125732,-0.021743774,-0.0016679764,-0.05105591,-0.0524292,-0.003194809,0.0037326813,-0.007865906,-0.01146698,-0.02609253,-0.039764404,-0.0027980804,-0.042144775,0.0076560974,-0.00069999695,0.017807007,0.013717651,-0.018753052,0.0050811768,0.015098572,-0.015235901,0.034057617,0.0090408325,-0.001531601,-0.039031982,0.01020813,0.019515991,0.009788513,-0.005847931,-0.019638062,-0.001698494,-0.015602112,-0.050445557,0.0039520264,-0.0006971359,-0.013832092,-0.01651001,0.0017213821,-0.053771973,-0.0005493164,-0.016174316,-0.004043579,0.027359009,0.021987915,-0.00035524368,-0.0069351196,0.019470215,0.0017757416,-0.015106201,-0.026733398,0.02293396,0.0102005005,0.0022621155,0.036193848,0.03982544,0.004261017,-0.028411865,0.0041275024,0.004585266,0.016708374,-0.015197754,0.006954193,-0.016235352,0.0129852295,-0.009277344,-0.019317627,-0.033935547,0.00044560432,0.076538086,0.0024547577,-0.007835388,-0.011352539,-0.018447876,0.014633179,0.02720642,-0.04345703,-0.0027427673,-0.030471802,0.016906738,-0.025497437,0.011047363,0.004108429,0.032409668,-0.013961792,-0.046447754,-0.013664246,-0.0014419556,-0.011726379,-0.07086182,-0.021652222,-0.072753906,0.013290405,-0.006160736,-0.028717041,0.009918213,0.0035057068,-0.018173218,-0.07397461,0.010055542,0.043426514,-0.000269413,0.023788452,-0.0073051453,0.028564453,0.020980835,-0.023925781,-0.000042438507,0.030960083,-0.027557373,-0.014854431,-0.026687622,0.014930725,-0.008491516,-0.00806427,0.003873825,0.008087158,0.012458801,-0.008392334,0.01146698,-0.0031776428,0.024887085,-0.021896362,0.019012451,-0.0015850067,-0.016815186,0.03414917,-0.047668457,0.026382446,0.009414673,-0.0046577454,0.013267517,0.032165527,0.050842285,-0.039154053,-0.008331299,0.016983032,0.021514893,0.036132812,-0.01777649,0.043701172,0.019363403,-0.015304565,0.017089844,-0.008705139,-0.007987976,-0.039642334,-0.024780273,0.026504517,0.00046777725,0.011772156,-0.018493652,0.009231567,0.021102905,-0.00699234,0.00894165,-0.0082473755,-0.01689148,-0.029647827,-0.00023627281,0.0033683777,0.0063285828,-0.008087158,0.026229858,0.023254395,0.034088135,0.009468079,-0.015174866,0.0032138824,0.03591919,-0.008125305,0.004863739,0.031097412,0.011314392,0.013366699,0.026916504,0.009521484,-0.052215576,-0.0051002502,-0.029052734,-0.025482178,0.0064888,-0.013572693,-0.017959595,-0.0030708313,0.0021648407,-0.011909485,-0.029129028,-0.00016701221,-0.025146484,-0.020492554,-0.010116577,-0.006729126,0.02684021,0.010047913,0.002008438,0.014877319,-0.004360199,0.04257202,-0.0019569397,-0.010147095,0.030838013,0.031799316,0.02041626,-0.032989502,-0.002986908,-0.013153076,0.001698494,0.0040359497,-0.04095459,0.01386261,0.043029785,-0.023117065,0.00090265274,0.0012178421,0.029342651,-0.011657715,0.0023040771,-0.0066604614,0.021911621,-0.003932953,0.03475952,-0.049926758,0.017364502,0.009002686,0.0071372986,-0.012901306,-0.007045746,-0.023910522,0.017562866,-0.0012359619,0.0026378632,0.050476074,0.0027618408,0.02456665,-0.024856567,-0.021759033,0.005493164,-0.027404785,-0.025222778,0.015159607,-0.014694214,-0.0009627342,0.0025939941,-0.020385742,0.028045654,-0.028625488,0.010192871,0.0027503967,-0.0028305054,-0.0073547363,-0.024887085,-0.01058197,-0.002653122,-0.020584106,-0.0033359528,-0.0034236908,0.04989624,0.0132751465,0.028213501,0.044830322,0.005012512,0.0006299019,-0.039978027,-0.02923584,-0.0021800995,-0.018539429,0.014167786,-0.018066406,0.05126953,0.039520264,0.0028362274,0.03475952,0.038635254,0.037475586,-0.0013618469,0.006916046,-0.015609741,0.012702942,-0.013847351,0.024475098,-0.008346558,0.04647827,-0.025726318,0.025817871,0.014801025,0.03262329,-0.02305603,0.039489746,0.05987549,0.015914917,-0.003458023,0.027816772,-0.0021476746,-0.011383057,-0.006690979,-0.021987915,0.05368042,0.010375977,0.053222656,0.044799805,-0.0011491776,-0.00061941147,0.020309448,-0.029312134,-0.019805908,0.06878662,0.019348145,-0.020843506,-0.015106201,0.00484848,0.007736206,-0.04296875,-0.024230957,0.01928711,-0.012138367,0.004261017,-0.01663208,-0.0039367676,-0.015266418,0.0021266937,0.013870239,0.015625,-0.01914978,0.025741577,0.027740479,0.0066070557,0.03765869,-0.0013284683,0.034240723,-0.026153564,-0.031707764,0.014205933,0.013755798,-0.0098724365,-0.0043029785,0.024215698,-0.004005432,0.045013428,0.039733887,-0.01725769,0.0070266724,0.032318115,0.0143966675,-0.0016288757,0.051727295,0.040039062,0.019714355,0.040985107,0.028030396,0.03250122,-0.039916992,0.024841309,0.0040283203,0.0030174255,-0.014564514,-0.014724731,-0.0002477169,-0.013793945,0.024475098,-0.010620117,-0.01423645,0.019744873,0.0262146,-0.010604858,-0.0044784546,-0.00055503845,0.0018949509,-0.01235199,-0.0027065277,0.021820068,-0.020065308,0.028640747,0.019424438,0.032562256,-0.01687622,0.024337769,-0.005683899,-0.019515991,-0.006549835,0.019805908,-0.034118652,0.009338379,-0.0031223297,-0.0059509277,-0.05255127,0.016448975,0.027069092,-0.0063056946,0.026550293,0.009346008,-0.009429932,-0.00014352798,0.01914978,0.007785797,0.006298065,-0.0112838745,-0.023223877,0.035217285,0.04421997,0.00041341782,0.0064888,-0.015403748,-0.0006837845,0.0056266785,-0.0037460327,-0.008453369,-0.01676941,-0.024230957,-0.021987915,0.013328552,0.02394104,0.024749756,0.05331421,-0.021118164,-0.01007843,0.010398865,0.036468506,-0.0028629303,0.0037059784,-0.0016260147,0.026000977,-0.023452759,0.04446411,0.045959473,0.009773254,0.0368042,-0.0093307495,-0.013847351,0.011184692,-0.0057411194,0.02885437,-0.013008118,0.009429932,-0.0027256012,0.027664185,-0.020019531,-0.048614502,0.009552002,-0.021728516,-0.024841309,-0.030288696,0.0074920654,0.00091791153,0.03656006,0.03744507,0.019180298,-0.030212402,0.060424805,-0.011054993,0.050811768,-0.0012407303,-0.022323608,0.052215576,0.026290894,0.031341553,0.019241333,0.01928711,-0.034179688,0.0132751465,0.040527344,0.023727417,0.00806427,0.0011453629,-0.011398315,0.036987305,0.0021629333,0.030136108,-0.0064468384,0.0060768127,0.017440796,0.002664566,-0.0077171326,-0.011566162,-0.00091695786,-0.0024662018,0.047424316,-0.027252197,-0.017425537,-0.0262146,-0.0071983337,0.030685425,-0.0033302307,0.0051841736,-0.009780884,-0.032196045,0.008003235,-0.028182983,-0.023025513,0.005428314,0.022949219,-0.04196167,-0.010948181,0.01083374,0.012672424,-0.023086548,0.03137207,0.030960083,-0.004386902,0.009880066,0.040496826,-0.012832642,0.029876709,-0.013809204,0.022232056,0.028076172,0.0046691895,-0.015342712,-0.007347107,0.0118637085,-0.012046814,0.021484375,0.029129028,-0.0132369995,0.0017175674,0.00049877167,-0.006385803,-0.0041007996,0.0007314682,-0.008995056,0.0068969727,-0.007091522,-0.0112838745,0.0020484924,-0.00040769577,-0.0004878044,0.007335663,-0.02017212,-0.02104187,0.019973755,0.035491943,0.025512695,-0.03466797,-0.0032157898,0.0053138733,-0.00029325485,-0.02394104,-0.014389038,-0.0044059753,-0.034820557,0.014816284,0.01725769,0.010147095,0.019760132,-0.025512695,0.004257202,0.019317627,0.0043945312,0.015083313,0.005554199,-0.013076782,0.004447937,-0.015838623,-0.00844574,-0.011909485,-0.01309967,0.014892578,0.03149414,0.0025291443,-0.027816772,0.030044556,-0.0039749146,0.01828003,0.0008740425,-0.0059509277,0.023727417,-0.0096588135,-0.00074481964,-0.003288269,0.018692017,-0.013435364,-0.012031555,-0.0135650635,0.03250122,0.055480957,-0.011161804,-0.011192322,0.017608643,0.0155181885,0.020217896,0.041046143,0.018081665,0.040649414,0.021820068,-0.018325806,-0.02684021,0.014816284,-0.011779785,-0.022064209,0.013694763,-0.010032654,-0.011207581,0.01386261,-0.0028305054,0.0032253265,-0.028930664,-0.01033783,-0.009902954,-0.021560669,0.018615723,-0.0042762756,0.022460938,-0.017944336,-0.0131073,0.00059080124,-0.023086548,-0.051208496,-0.019210815,-0.0016222,-0.010673523,-0.055389404,0.009284973,-0.030059814,0.0104904175,-0.013252258,0.005783081,-0.013938904,0.020355225,-0.008895874,-0.007785797,-0.0047302246,0.01965332,0.02720642,0.0039596558,0.022216797,-0.025054932,-0.021530151,-0.021911621,0.009002686,-0.0065727234,0.026031494,0.004623413,0.03765869,0.023651123,-0.016036987,0.00381279,-0.012840271,-0.012199402,-0.010864258,-0.016952515,-0.022979736,0.0234375,0.0076560974,-0.008857727,-0.0017328262,0.027023315,-0.022720337,-0.015068054,0.028335571,0.050079346,0.0059661865,0.029525757,-0.015472412,0.0028381348,-0.00945282,-0.0014629364,-0.012107849,0.0107421875,0.009864807,0.0055236816,-0.0055770874,0.009635925,0.020401001,-0.014053345,-0.004211426,0.02407837,0.017990112,-0.004600525,0.04360962,0.019134521,0.011749268,-0.009117126,-0.012321472,0.016815186,0.052001953,0.015365601,0.015914917,0.004459381,0.003610611,-0.012649536,0.0099487305,0.008705139,-0.016555786,-0.04449463,-0.011108398,-0.027954102,0.018081665,0.000044047832,0.007709503,-0.010948181,0.017028809,-0.017333984,-0.03277588,-0.014373779,0.026550293,0.023208618,-0.011604309,-0.019989014,0.005794525,0.015563965,-0.02268982,-0.005142212,-0.04724121,-0.037322998,-0.00349617,-0.015777588,0.018096924,0.0124053955,-0.010017395,0.004119873,-0.0026397705,0.0018014908,-0.0096588135,0.023239136,-0.012619019,0.0025691986,0.023284912,0.012130737,-0.0141067505,0.019851685,-0.0066719055,-0.0031929016,0.0067634583,-0.013404846,0.01600647,-0.018432617,0.041778564,-0.0099105835,-0.000395298,0.03744507,-0.005958557,0.018630981,-0.036621094,0.0065345764,-0.0008029938,-0.0044136047,0.044647217,-0.025894165,-0.02079773,0.007873535,-0.01209259,-0.018814087,0.0004427433,0.016906738,0.035064697,-0.0096206665,0.054656982,-0.014022827,-0.0009613037,0.016235352,0.018920898,-0.0099487305,0.0028514862,0.025054932,0.007598877,-0.0036621094,-0.0066604614,-0.009788513,-0.032318115,-0.015136719,0.0158844,-0.00554657,-0.0079956055,0.01687622,0.014892578,0.041625977,-0.0060920715,0.017471313,0.016464233,0.0056533813,0.03201294,-0.00064373016,0.042633057,0.00033068657,-0.026657104,0.0031700134,0.005039215,-0.023254395,0.0018310547,-0.0043792725,-0.0021572113,-0.035827637,0.0072135925,-0.0052452087,0.020858765,-0.017654419,0.0072631836,-0.019577026,-0.001991272,-0.046295166,-0.020874023,-0.03439331,0.008010864,0.024398804,-0.00092840195,0.029907227,0.006729126,-0.01058197,0.019866943,0.048919678,0.00003194809,-0.028381348,-0.021408081,0.00014841557,-0.007446289,0.010009766,0.00995636,-0.02178955,-0.016067505,0.0013494492,-0.018875122,0.0140686035,-0.009399414,0.01600647,0.007205963,0.0062942505,-0.010429382,0.027069092,-0.010864258,-0.005680084,0.011619568,0.006313324,0.041625977,0.03326416,-0.020904541,0.016586304,0.016815186,-0.041259766,0.05621338,-0.0056419373,0.034454346,-0.010131836,0.007019043,-0.04171753,-0.023635864,-0.012840271,0.004055023],"createdAt":"2026-04-18T18:50:40.438Z","updatedAt":"2026-04-23T02:01:19.552Z","lastSeenAt":"2026-04-23T02:01:19.552Z","tsv":"'/api':175 '/api/v1/payments/372':69 '/docs':173 '/pricing':174 '/readme':177 '/request':19,38,166 '0.02':18,37,78,165 '000':82 '20':81 '6':88 'accept':218 'access':75 'account':100 'actual':225 'advertis':122 'ai':12,31,133 'ai-inference' 'analysi':137 'analyt':127 'api':5,24,45,74,98 'application/json':222 'attach':108 'avail':204 'base':8,27,63,83 'base network api' 'base-network' 'bodi':227 'broad':50 'call':4,23,80 'caller':106 'catalog':51 'categori':125 'challeng':211 'classif':140 'classification' 'confirm':212 'connect':183 'convers':157 'cost':77 'crawl':207 'data':11,30,126,130 'data-analytics' 'decim':89 'detail':190 'document':168,199 'embed':141 'embeddings' 'enabl':44 'endpoint':16,35,57,67,124,161,214,235 'estim':151 'exampl':203 'exchang':146 'export':131 'extrem':170 'feed':145 'financ':13,32,142 'finance-data' 'format':228 'four':123 'gas':150 'generat':158 'geocod':155 'geocoding' 'handl':92 'header':113 'infrastructur':153 'insight':132 'key':99 'learn':135 'limit':103 'list':71,160 'live':216 'low payment fee' 'lowpaymentfee.com':39 'machin':134 'materi':208 'metric':128 'micropayment api' 'network':64 'no-api-key' 'no-auth api' 'offer':10,29 'openapi':194 'page':178 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':90,112,117 'per':3,22,55,79 'platform':6,25,46,121 'post':219 'premium':73 'price':144,167 'prompt':185 'proof':118 'protocol':96 'provid':48 'quot':149 'rate':102,147 'render':180 'report':129 'request':56,220,226 'request/response':197 'requir':105 'respons':230 'return':221 'schema':198 'sentiment':136 'sentiment-analysis' 'serverless api' 'settl':58 'share':162 'simpli':107 'spars':171 'spec':195 'specif':66,234 'structur':231 'summar':139 'technic':189 'text':138 'text-summarization' 'token':148 'unit':84 'unknown':237 'usag':202 'usdc':9,28,60,86 'usdc api' 'usdc-settlement' 'util':15,34,154 'utility-apis' 'valid':116,156 'via':93 'wallet':184 'web3':143 'wider':120 'x':111 'x-payment':110 'x402':43,95,210 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"59ea4316-9f5f-403f-9938-b09ca0f439e8","listingId":"ce93e489-1125-4a97-99de-f648dccdb3d7","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/payments/372","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:40.438Z"}],"sources":[{"listingId":"ce93e489-1125-4a97-99de-f648dccdb3d7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/372","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:40.438Z","lastSeenAt":"2026-04-23T02:01:19.552Z"}],"details":{"listingId":"ce93e489-1125-4a97-99de-f648dccdb3d7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/372 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/372"},{"claim":"All listed endpoints 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":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/372"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Micropayment-gated data retrieval for analytics or financial data","AI inference tasks (sentiment, summarization, classification) paid per call","Utility operations like geocoding or data conversion with instant crypto settlement"],"bestFor":["Developers and agents wanting zero-signup, pay-as-you-go API access","Crypto-native workflows that can settle USDC on Base","Low-volume or bursty usage patterns where per-request pricing is economical"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without USDC on Base or unfamiliar with x402 payment protocol","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.428Z"},"updatedAt":"2026-04-23T02:01:19.552Z"}}