{"id":"b378a6b0-0cfc-41d7-9daa-afaa7162773d","shortId":"MLWsBW","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transfers/137` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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 endpoints are priced at $0.02 per request.\n\nHowever, the specific functionality of the `/api/v1/transfers/137` endpoint is unclear. The path suggests a transfer or transaction-related operation, but no documentation, request schema, or response schema is available beyond the generic \"Premium API Access\" label. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further content. Without concrete documentation on what this endpoint accepts or returns, callers should treat this as an exploratory integration.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["infrastructure","finance"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto API payment","402 payment protocol"],"warnings":["No documentation available — docs, pricing, API, and README pages all return only 'Connect wallet' with no content.","The specific functionality of /api/v1/transfers/137 is unknown; the path implies a transfer operation but no schema or description is provided.","No OpenAPI spec, no request body schema, and no response schema are available.","No examples of successful responses exist in the crawl material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/137","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/transfers/137","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge), but there is no documentation, no request/response schema, and no explanation of what /api/v1/transfers/137 actually does. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.","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":"2026-04-19T14:07:37.301Z","embedding":[-0.023910522,-0.03729248,0.048461914,0.019866943,0.00084495544,-0.027145386,-0.018463135,0.031051636,0.07543945,-0.06524658,0.024856567,-0.032989502,-0.03933716,-0.026657104,-0.025787354,-0.00023818016,0.006515503,0.004398346,-0.027252197,0.035369873,0.037353516,-0.013191223,-0.033081055,0.01789856,0.013931274,-0.025726318,-0.010597229,-0.014060974,-0.017990112,-0.028869629,0.036987305,-0.023956299,-0.017684937,0.01335144,-0.013633728,-0.011245728,0.008003235,0.044158936,0.022750854,0.0064888,0.00466156,-0.051452637,-0.0052452087,-0.016662598,-0.06518555,0.0011701584,-0.014831543,-0.027755737,-0.00012135506,-0.00068712234,-0.022445679,-0.010406494,-0.018478394,0.019851685,0.008628845,0.014892578,-0.0020160675,-0.014122009,0.004901886,0.027526855,-0.021972656,-0.05822754,-0.01889038,-0.019989014,0.016235352,0.055480957,-0.021881104,0.047790527,0.008491516,0.06628418,0.025009155,0.052001953,0.030883789,0.012268066,0.004501343,0.009269714,-0.0137786865,0.048583984,-0.010536194,-0.028884888,-0.013664246,-0.028533936,-0.050445557,0.006843567,-0.018615723,-0.034576416,-0.017959595,0.016159058,-0.006504059,0.012504578,-0.06719971,0.00016844273,0.0010795593,-0.0006275177,0.0006303787,-0.015670776,-0.0024967194,0.02142334,-0.005470276,0.016693115,-0.020324707,-0.03842163,0.020751953,0.015960693,0.03591919,0.029281616,0.020492554,0.026947021,0.013084412,0.006259918,-0.01802063,0.019119263,-0.0129470825,0.0017652512,0.017059326,-0.011520386,-0.0024662018,0.015403748,-0.040527344,0.03479004,-0.064697266,0.03137207,0.011787415,-0.00061511993,-0.004070282,-0.05227661,-0.001077652,0.028717041,-0.023986816,-0.010276794,0.021850586,0.0060157776,0.02545166,-0.014472961,-0.03390503,0.013092041,-0.027709961,-0.0076904297,-0.058502197,-0.041900635,0.042266846,-0.024917603,0.010673523,0.036865234,-0.099975586,-0.009376526,-0.027191162,0.015327454,-0.015098572,-0.0050735474,0.0006709099,0.028808594,-0.009635925,-0.020767212,-0.023117065,-0.026382446,0.0055351257,0.030715942,-0.0138549805,0.044708252,-0.03375244,0.016906738,0.014907837,-0.004447937,0.014533997,0.020996094,-0.0076446533,-0.077941895,-0.08526611,0.00076532364,-0.008514404,-0.014137268,-0.036834717,0.017318726,-0.0068244934,-0.070129395,-0.01524353,-0.046051025,-0.00025868416,-0.04031372,0.0039405823,-0.028533936,0.022903442,-0.0074157715,-0.06939697,-0.019378662,-0.02243042,0.04849243,0.030578613,0.024276733,0.03933716,-0.006729126,0.06695557,0.015686035,-0.03050232,-0.015609741,0.015434265,-0.013511658,0.014816284,-0.011749268,0.02003479,-0.03970337,0.033355713,0.070373535,-0.010574341,-0.025970459,-0.004360199,-0.06173706,-0.04586792,-0.022994995,0.023330688,0.013755798,-0.0073623657,0.05114746,-0.037139893,-0.030426025,0.004096985,0.01638794,0.017120361,0.05581665,0.009521484,-0.018066406,0.018875122,0.018814087,-0.05419922,0.037963867,0.035186768,0.004699707,-0.035186768,-0.020965576,0.035003662,0.041870117,-0.029632568,-0.00031399727,-0.00907135,0.024459839,-0.015914917,-0.0021400452,0.0037937164,-0.014083862,-0.027832031,-0.01486969,-0.029373169,0.027816772,-0.0032978058,-0.024810791,-0.028076172,-0.08117676,0.06982422,0.033111572,0.045776367,-0.007511139,0.001502037,-0.012199402,-0.020980835,-0.06213379,0.055114746,0.066223145,-0.0009365082,-0.015457153,0.03326416,-0.014793396,-0.039733887,0.01751709,-0.010398865,-0.02986145,-0.022949219,0.013313293,-0.048309326,0.01890564,0.026473999,0.028533936,0.045440674,-0.00819397,-0.059509277,-0.020492554,-0.008285522,-0.0021076202,-0.023910522,-0.006412506,-0.01361084,0.018249512,0.012580872,-0.0004529953,0.012466431,-0.0014591217,0.00082731247,0.0060691833,0.012458801,-0.015640259,-0.037506104,0.009063721,0.0017623901,-0.051361084,-0.00233078,-0.0019721985,0.070739746,-0.05001831,0.036376953,-0.002002716,0.0011358261,0.0423584,0.005054474,-0.038604736,0.012001038,0.023391724,0.003068924,0.051116943,0.016540527,-0.031677246,-0.013145447,0.07897949,-0.019042969,-0.01007843,0.011940002,0.021942139,0.041229248,-0.0010585785,-0.05407715,-0.024047852,-0.015548706,-0.040802002,0.027862549,-0.018859863,0.04095459,-0.013145447,0.0047416687,-0.02029419,0.006263733,-0.021713257,0.0027446747,-0.011146545,0.013648987,-0.022659302,-0.020233154,0.022094727,0.0054740906,-0.006401062,0.00044703484,0.040039062,0.024749756,-0.0022220612,-0.012321472,-0.03050232,-0.009361267,-0.000048696995,0.034973145,0.016616821,0.0256958,0.06451416,-0.04095459,0.014595032,0.016189575,0.025314331,0.018447876,-0.0035495758,-0.0038871765,-0.072021484,-0.049346924,-0.026245117,-0.04321289,0.030715942,0.010940552,-0.0047416687,0.04788208,0.0154953,-0.024124146,-0.034484863,0.014511108,-0.05834961,-0.005584717,0.041290283,-0.027297974,-0.02017212,0.0024166107,-0.0040626526,0.009300232,0.026779175,0.011627197,0.035705566,0.07623291,0.04324341,0.0010938644,0.019638062,-0.010688782,0.019119263,0.0070228577,-0.024856567,-0.025619507,-0.019042969,0.042938232,-0.017929077,-0.014312744,-0.061279297,0.046539307,0.051879883,0.087402344,0.0209198,0.0054244995,0.019241333,-0.0077209473,0.0025424957,-0.032470703,-0.015342712,-0.026550293,-0.0395813,0.026535034,-0.0054740906,-0.0107803345,-0.027938843,0.050079346,-0.00970459,0.028305054,-0.023239136,0.050720215,-0.022476196,-0.021377563,0.009780884,0.014877319,0.045318604,0.07092285,-0.050628662,0.02218628,0.027023315,-0.01953125,-0.0014333725,0.02947998,-0.0044059753,-0.0020179749,-0.04812622,-0.028717041,0.0011940002,-0.0018119812,-0.04248047,0.0206604,0.02243042,0.031982422,0.02508545,-0.008743286,-0.0051879883,-0.006565094,-0.0066375732,-0.056640625,0.0049819946,-0.031173706,0.003967285,0.044952393,-0.018600464,-0.0072669983,0.0012712479,-0.0053596497,-0.012054443,-0.001914978,0.025939941,0.008300781,-0.045166016,0.021881104,0.009689331,0.014854431,0.015838623,0.030273438,0.018997192,0.047424316,0.03781128,0.024627686,-0.015991211,-0.06555176,0.011421204,-0.048095703,-0.0068130493,0.028869629,-0.023788452,0.0096588135,-0.020462036,-0.036224365,-0.025375366,0.02192688,-0.03024292,-0.0021343231,0.019744873,-0.015838623,-0.031402588,-0.049224854,-0.03289795,-0.001824379,0.04849243,0.012542725,0.02734375,-0.0769043,-0.011619568,0.03286743,0.0121154785,0.024856567,-0.013832092,-0.009353638,-0.015670776,-0.023376465,-0.01374054,-0.022567749,0.03024292,-0.011375427,-0.0056610107,0.015457153,0.008644104,0.024124146,0.008514404,0.021347046,0.031341553,-0.037017822,-0.008430481,-0.00093889236,0.025466919,0.01512146,-0.01689148,-0.051971436,0.043945312,0.015602112,0.037750244,-0.044525146,-0.01309967,-0.019805908,0.018218994,0.0112838745,-0.0012722015,-0.0012769699,-0.0077209473,-0.044281006,-0.05822754,0.05429077,-0.033477783,0.03466797,0.032928467,-0.0048942566,0.019454956,-0.012107849,-0.009765625,0.008712769,-0.02053833,-0.014274597,-0.011039734,-0.028579712,-0.031051636,-0.018112183,-0.02130127,0.020904541,-0.0236969,0.022338867,0.0015258789,-0.02041626,0.019470215,-0.004257202,-0.0071792603,0.017669678,-0.00080251694,0.02557373,0.033966064,0.01096344,-0.04525757,0.0131073,-0.0055274963,0.011054993,-0.0025844574,0.04458618,0.023239136,0.0026855469,0.009254456,-0.012771606,-0.023651123,-0.021438599,-0.010734558,0.01309967,0.015136719,-0.0075569153,-0.03768921,0.009346008,0.006587982,-0.03881836,-0.03366089,0.017501831,0.010566711,-0.034698486,0.023925781,0.03756714,0.045318604,-0.019943237,-0.0037231445,-0.006336212,0.027633667,0.036376953,0.0016899109,-0.017303467,0.0152282715,-0.019500732,0.024841309,-0.0038833618,-0.01309967,0.02243042,0.006175995,0.024307251,0.027816772,0.0026073456,-0.032928467,-0.045135498,0.0010175705,-0.0064926147,-0.027374268,0.023803711,0.012084961,0.023101807,-0.022720337,0.021957397,0.013038635,-0.022338867,-0.012420654,-0.011856079,0.044677734,-0.023773193,-0.010498047,0.016342163,0.018173218,0.031707764,-0.05532837,-0.000849247,-0.0017414093,0.010620117,-0.017425537,-0.045715332,-0.033050537,0.0039901733,0.03503418,0.0055274963,0.019241333,0.038909912,-0.004711151,0.009796143,0.025772095,-0.0069084167,-0.022140503,-0.027557373,-0.040008545,-0.02178955,-0.0072784424,0.0018920898,-0.030197144,0.011604309,0.002067566,-0.031051636,0.0069084167,-0.01348114,0.002407074,-0.016815186,0.009681702,0.040740967,-0.0033893585,0.028686523,-0.016998291,-0.051483154,0.011009216,0.0078125,0.018447876,-0.04510498,0.011520386,-0.01826477,0.0006933212,0.006916046,0.016220093,0.019363403,0.026138306,0.0020446777,0.036499023,-0.04498291,0.042541504,-0.029632568,0.00045895576,-0.008735657,-0.046020508,-0.025131226,-0.016937256,-0.022979736,0.045043945,-0.03515625,-0.00831604,-0.02267456,-0.04196167,-0.0054626465,-0.053619385,0.01449585,0.03970337,0.03326416,-0.0287323,-0.0023536682,0.0043258667,0.008956909,-0.013687134,0.0026569366,-0.015571594,0.0152282715,0.028076172,-0.002368927,-0.037506104,-0.025558472,-0.024841309,-0.014549255,-0.042907715,-0.053619385,-0.019165039,0.005290985,-0.014587402,-0.005088806,-0.013496399,-0.019943237,0.0038547516,-0.041259766,0.0030002594,0.013587952,0.024490356,0.0064201355,-0.028625488,0.0070228577,0.016479492,-0.015945435,0.036865234,0.012207031,-0.000497818,-0.03665161,0.0026493073,0.0054130554,0.02822876,-0.0023517609,-0.024505615,-0.009963989,-0.013702393,-0.06286621,-0.004760742,-0.010559082,-0.009124756,-0.0056648254,-0.0041503906,-0.048095703,-0.0013122559,-0.007171631,-0.0018196106,0.01889038,-0.0005311966,0.015823364,0.0013465881,0.017837524,-0.0030155182,-0.009346008,-0.022857666,0.01008606,0.010223389,0.0006556511,0.021713257,0.059326172,0.008956909,-0.027404785,0.0031909943,0.0055885315,0.014640808,-0.02507019,0.0077552795,-0.015525818,0.009864807,-0.004009247,-0.013160706,-0.02822876,0.0034770966,0.080078125,-0.0019893646,-0.015792847,-0.01234436,-0.01687622,0.017578125,0.031799316,-0.034332275,-0.0055389404,-0.015808105,0.018615723,-0.027374268,0.014305115,0.010803223,0.018737793,-0.018920898,-0.054504395,-0.017196655,-0.012054443,-0.009132385,-0.0579834,-0.019989014,-0.059692383,0.005794525,-0.004463196,-0.029922485,0.00033926964,0.01576233,-0.01928711,-0.07659912,0.00995636,0.05307007,0.015548706,0.032287598,-0.009506226,0.019958496,0.030319214,-0.044708252,-0.0045166016,0.017028809,-0.027145386,-0.025970459,-0.028121948,0.032196045,-0.014930725,-0.025894165,0.0088272095,0.009178162,0.018188477,-0.00970459,0.0010061264,-0.009597778,0.014266968,-0.022109985,0.021469116,-0.012321472,-0.019760132,0.030578613,-0.04928589,0.029785156,0.011657715,-0.014518738,0.0062026978,0.032196045,0.041656494,-0.044677734,-0.021118164,0.010131836,0.014266968,0.025115967,-0.019332886,0.04345703,0.0146102905,-0.016677856,0.01789856,-0.0074539185,-0.017974854,-0.014518738,-0.020690918,0.018798828,-0.014945984,0.018981934,-0.034240723,-0.0001103282,0.01158905,0.014060974,0.006160736,-0.015136719,-0.011772156,-0.016052246,-0.018432617,0.009178162,0.009140015,-0.009017944,0.027191162,0.02331543,0.042297363,0.00856781,-0.017486572,-0.00034236908,0.03564453,-0.012023926,0.011657715,0.020507812,0.008003235,0.013404846,0.015548706,0.013969421,-0.052856445,-0.022201538,-0.0074386597,-0.023101807,-0.0035381317,-0.003736496,-0.013801575,-0.012016296,0.0038547516,-0.008377075,-0.028305054,0.00031375885,-0.025161743,-0.028656006,-0.010261536,-0.018127441,0.019714355,-0.00060367584,0.008407593,-0.0021648407,0.0011644363,0.027786255,0.004108429,-0.022491455,0.019454956,0.032196045,0.021209717,-0.03048706,-0.0019989014,-0.014007568,-0.011962891,-0.003730774,-0.032562256,0.006614685,0.038269043,-0.012130737,-0.0132751465,0.0025730133,0.024490356,-0.000019967556,0.005428314,-0.008483887,0.020690918,-0.015289307,0.042816162,-0.042236328,0.032226562,0.006755829,0.0019989014,-0.009063721,-0.010810852,-0.025634766,0.020080566,0.010528564,-0.013084412,0.045196533,0.010093689,0.021575928,-0.011482239,-0.018966675,0.013458252,-0.024047852,-0.01133728,0.022277832,-0.014801025,-0.0019702911,0.0037651062,-0.028427124,0.041290283,-0.03253174,0.016159058,0.005554199,0.009475708,-0.0061073303,-0.024765015,-0.0020313263,-0.014122009,-0.017532349,0.015548706,-0.0008497238,0.049682617,0.02268982,0.02420044,0.055358887,0.017700195,-0.011238098,-0.03881836,-0.021255493,0.018127441,-0.024047852,0.016403198,-0.02079773,0.049102783,0.03729248,0.009307861,0.038726807,0.023269653,0.033813477,0.007881165,0.008026123,-0.024215698,0.014533997,0.005722046,0.032073975,-0.0129776,0.036956787,-0.027816772,0.021865845,0.014984131,0.026016235,-0.03439331,0.03137207,0.074157715,0.015686035,-0.00081014633,0.039642334,-0.011756897,-0.005683899,-0.0059165955,-0.023742676,0.052581787,-0.006816864,0.05670166,0.048858643,0.018875122,-0.00064086914,0.023529053,-0.01965332,-0.019332886,0.06500244,0.02015686,-0.014266968,-0.012214661,0.0012722015,0.021606445,-0.036499023,-0.035186768,0.021224976,-0.018951416,0.01638794,-0.0006198883,-0.020751953,-0.010559082,0.013031006,0.013366699,0.015213013,-0.013252258,0.02658081,0.03793335,-0.0054473877,0.020553589,-0.010147095,0.018692017,-0.027862549,-0.023208618,0.025527954,0.025238037,-0.009124756,-0.014213562,0.03652954,0.0070610046,0.032043457,0.046325684,-0.032287598,0.0059280396,0.03869629,0.0029888153,-0.012046814,0.05340576,0.042510986,0.011634827,0.0368042,0.02015686,0.031707764,-0.04034424,0.025650024,-0.00466156,0.005218506,-0.01020813,-0.008369446,0.006713867,-0.020202637,0.009674072,0.0048332214,-0.010437012,0.031204224,0.03552246,-0.0037136078,-0.0020160675,-0.004306793,0.010383606,-0.029296875,0.0024967194,0.0019245148,-0.020599365,0.040008545,0.0008955002,0.03842163,-0.013725281,0.02017212,-0.00032758713,-0.02041626,-0.0044784546,0.02796936,-0.030151367,0.0039405823,-0.0047454834,0.010421753,-0.054534912,0.009605408,0.020568848,-0.020843506,0.025527954,-0.0025997162,-0.009361267,-0.008277893,0.03265381,0.0154953,-0.00440979,-0.013069153,-0.022537231,0.039093018,0.05029297,-0.0065307617,0.003326416,-0.030761719,-0.004016876,0.0034637451,-0.0051612854,0.000071942806,-0.018173218,-0.02305603,-0.027175903,0.029037476,0.039398193,0.027740479,0.05505371,-0.036499023,-0.006664276,0.0003092289,0.04147339,-0.0040016174,-0.009819031,-0.0034160614,0.01423645,-0.023956299,0.045562744,0.026473999,0.015701294,0.031402588,-0.005870819,-0.01852417,0.005645752,-0.014328003,0.02178955,-0.023651123,0.0011901855,0.0013685226,0.024307251,-0.0146865845,-0.03781128,0.01953125,-0.017120361,-0.034088135,-0.014945984,0.017440796,0.008384705,0.025177002,0.037322998,0.02571106,-0.01436615,0.05731201,-0.011940002,0.04650879,0.009124756,-0.016555786,0.047210693,0.005672455,0.02482605,0.016159058,0.01399231,-0.035308838,0.022628784,0.034698486,0.02128601,0.015853882,0.012138367,-0.0062446594,0.031341553,-0.0017194748,0.025802612,-0.013038635,0.0053367615,0.016235352,0.0023403168,-0.008796692,-0.008270264,-0.0068626404,0.00869751,0.051452637,-0.040618896,-0.016540527,-0.021148682,-0.0085372925,0.01889038,-0.024765015,0.0051994324,-0.001581192,-0.017715454,0.017120361,-0.014434814,-0.031066895,0.003025055,0.02330017,-0.042663574,-0.020736694,-0.002702713,0.021575928,-0.02178955,0.02734375,0.023483276,-0.003660202,-0.0007510185,0.041625977,-0.0027008057,0.028381348,-0.01675415,0.034301758,0.036254883,0.0063552856,-0.030792236,-0.0032405853,0.00756073,-0.016555786,0.014472961,0.040008545,-0.0138549805,0.0011606216,-0.009353638,-0.004306793,-0.0034732819,0.0025196075,-0.006767273,0.011451721,-0.022201538,-0.0042495728,-0.0053749084,0.011711121,-0.0028648376,-0.004085541,-0.010482788,-0.019607544,0.008872986,0.028656006,0.009025574,-0.03756714,-0.014160156,0.009628296,0.012168884,-0.022888184,-0.011299133,-0.004245758,-0.02973938,0.012626648,0.0033607483,0.020584106,0.014778137,-0.019210815,0.0035114288,0.018951416,0.019378662,0.021865845,0.004070282,0.0067100525,0.019104004,-0.006122589,-0.005039215,0.0053520203,-0.010772705,0.013008118,0.028198242,-0.0009975433,-0.023544312,0.023162842,-0.0038776398,0.013534546,0.0061569214,-0.014198303,0.013420105,-0.0006155968,0.006916046,-0.0023422241,0.011100769,-0.00806427,-0.010101318,-0.016021729,0.03579712,0.050445557,-0.017730713,-0.0038166046,0.024261475,0.023483276,0.015022278,0.037475586,0.0055503845,0.044128418,0.022338867,-0.014678955,-0.02420044,0.037902832,-0.014434814,-0.023590088,0.010414124,0.0010795593,-0.016708374,0.015914917,0.01449585,-0.00044989586,-0.017456055,-0.018676758,-0.014968872,-0.0073623657,0.0070877075,-0.0234375,0.008338928,-0.023956299,-0.012390137,0.013305664,-0.0309906,-0.04901123,-0.009399414,-0.005592346,-0.0085372925,-0.055114746,0.006965637,-0.02911377,0.000623703,-0.039398193,0.000113248825,-0.010894775,0.010665894,-0.01725769,-0.00027108192,0.0066833496,0.028121948,0.022384644,0.011581421,0.021514893,-0.028945923,-0.024383545,-0.024749756,0.005634308,-0.01625061,0.013191223,0.016296387,0.024642944,0.019638062,-0.00390625,-0.010253906,-0.0073394775,-0.010383606,-0.017944336,-0.016235352,-0.028274536,0.029144287,0.019256592,-0.021087646,-0.015609741,0.049438477,-0.024658203,-0.021347046,0.038909912,0.04168701,0.0020961761,0.03375244,-0.028869629,-0.0025901794,-0.017562866,-0.010467529,-0.02017212,0.0063934326,0.0022525787,-0.0017814636,-0.016036987,0.0032844543,0.014801025,-0.02230835,-0.009811401,0.026916504,0.00932312,-0.01612854,0.03527832,0.021392822,0.0029067993,-0.02331543,-0.010398865,0.02520752,0.04168701,0.017349243,0.0079422,-0.0016756058,0.0031909943,-0.011421204,0.0068359375,0.016098022,-0.02331543,-0.045196533,-0.025161743,-0.0178833,0.0121154785,-0.0024986267,0.02053833,-0.015625,0.02444458,-0.006046295,-0.014701843,-0.03414917,0.025650024,0.008880615,-0.013954163,-0.0052833557,0.0098724365,0.006450653,-0.031433105,-0.0017175674,-0.04748535,-0.032287598,-0.0079574585,-0.020126343,0.02796936,0.012260437,0.0030937195,-0.012542725,-0.014381409,-0.0047836304,0.009185791,0.028045654,-0.019210815,-0.00016462803,0.0413208,0.012542725,-0.00995636,0.02722168,-0.017532349,-0.007801056,0.008514404,-0.005004883,0.009902954,-0.026779175,0.037841797,-0.014190674,-0.0017223358,0.022155762,-0.01486969,0.013092041,-0.036315918,0.004890442,-0.0038776398,-0.00617218,0.031311035,-0.023391724,-0.013381958,0.002216339,-0.013198853,-0.02935791,0.0073776245,0.017166138,0.025390625,-0.009933472,0.04824829,-0.016418457,-0.008270264,0.017990112,0.010368347,-0.020339966,0.005722046,0.032165527,-0.00053691864,0.00818634,-0.008735657,-0.013053894,-0.033111572,0.0012331009,0.011421204,-0.011070251,-0.013572693,0.030319214,0.019119263,0.03503418,-0.0017766953,0.022323608,0.014663696,0.016540527,0.027557373,0.0090408325,0.06689453,0.00283432,-0.013175964,0.0016384125,-0.0011911392,-0.015716553,0.0011100769,-0.0051231384,0.0038928986,-0.03982544,0.015136719,-0.0039787292,0.026321411,-0.017944336,0.0138168335,-0.027740479,-0.009849548,-0.0390625,-0.012901306,-0.02166748,0.006755829,0.031982422,-0.006351471,0.029663086,0.0051651,-0.02468872,0.016937256,0.046905518,-0.008605957,-0.035461426,-0.0050239563,0.023635864,0.00028800964,0.015113831,0.008605957,-0.020568848,-0.013549805,0.0074920654,-0.0132369995,-0.0008597374,-0.0011501312,0.010635376,0.0051078796,-0.0049819946,-0.009498596,0.031433105,-0.009056091,-0.0016326904,0.02166748,0.011024475,0.04034424,0.029403687,-0.012931824,0.013290405,0.017868042,-0.031982422,0.0703125,0.0064315796,0.021026611,-0.032043457,-0.00015544891,-0.03414917,-0.019607544,-0.013191223,0.016723633],"createdAt":"2026-04-18T19:27:30.082Z","updatedAt":"2026-04-23T21:32:45.723Z","lastSeenAt":"2026-04-23T21:32:45.723Z","tsv":"'/api/v1/transfers/137':56,160 '/request':13,28 '0.02':12,27,80,151 '000':74 '20':73 '402':66 '402 payment protocol' 'Base network API' 'USDC pay-per-call' 'accept':46,215 'access':62,189 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,61,84,110,188,195 'attach':93 'avail':183 'base':8,23,51,75 'beyond':184 'broader':106 'call':4,19,82 'caller':91,218 'categori':111 'challeng':67 'classif':127 'concret':209 'connect':201 'content':207 'convers':144 'crypto API payment' 'data':113,117 'doc':192 'document':176,210 'embed':128 'endpoint':55,147,161,214 'estim':138 'exchang':133 'exploratori':224 'export':118 'feed':132 'financ':129 'function':157 'gas':137 'generat':145 'generic':186 'geocod':142 'header':98 'howev':154 'http-post' 'i.e':79 'includ':112 'infrastructur':140 'insight':119 'integr':225 'key':85 'label':190 'learn':122 'limit':88 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'metric':115 'micropayment API' 'multipl':109 'network':9,24,52 'no-api-key' 'oper':173 'page':196 'path':165 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,69,97,103 'per':3,18,36,81,152 'platform':6,21,39,107 'premium':60,187 'price':131,149,193 'prompt':203 'proof':104 'protocol':44 'quot':136 'rate':87,134 'relat':172 'report':116 'request':37,153,177 'requir':68,90 'respons':180 'return':64,198,217 'schema':178,181 'sentiment':123 'simpli':92 'specif':54,156 'suggest':166 'summar':126 'text':125 'token':135 'transact':171 'transaction-rel':170 'transfer':168 'treat':220 'unclear':163 'unit':76 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':141 'valid':101,143 'via':10,25 'wallet':202 'web3':130 'without':208 'x':96 'x-payment':95 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"1df0096b-cb82-424d-8f16-30a28e7d4bd0","listingId":"b378a6b0-0cfc-41d7-9daa-afaa7162773d","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/transfers/137","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:30.082Z"}],"sources":[{"listingId":"b378a6b0-0cfc-41d7-9daa-afaa7162773d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/137","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:30.082Z","lastSeenAt":"2026-04-23T21:32:45.723Z"}],"details":{"listingId":"b378a6b0-0cfc-41d7-9daa-afaa7162773d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/137 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/137"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/137"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services paid per-call with USDC on Base","Agent-driven workflows that need keyless, on-demand API access","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need frictionless pay-per-use API access without signup","Applications already operating on the Base L2 network with USDC"],"notFor":["Users who need detailed API documentation and guaranteed SLAs before integrating","High-volume use cases where per-request pricing at $0.02 may add up significantly","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.921Z"},"updatedAt":"2026-04-23T21:32:45.723Z"}}