{"id":"9faff6e5-25c8-4a6b-a183-0b9b363186be","shortId":"8nY2uV","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general-purpose utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The x402 payment challenge is returned as a standard 402 response, and callers settle via an on-chain USDC micro-payment before receiving the response.\n\nThe probed endpoint (`/api/v2/auth`) is listed as \"Premium API Access\" and returns a valid x402 challenge requesting up to 20,000 base-unit USDC (i.e., $0.02, since USDC uses 6 decimals). The platform advertises additional endpoints across four categories: Data & Analytics (`/api/v1/analytics/metrics`, `/api/v1/analytics/reports`, `/api/v1/data/export`, `/api/v1/data/insights`), AI & Machine Learning (`/api/v2/ai/sentiment`, `/api/v2/ai/summarize`, `/api/v2/ai/classify`, `/api/v2/ai/embeddings`), Finance & Web3 (`/api/v1/finance/prices`, `/api/v1/finance/rates`, `/api/v1/crypto/quotes`, `/api/v1/crypto/gas`), and Infrastructure utilities (`/api/v1/utils/geocode`, `/api/v1/utils/validate`, `/api/v1/utils/convert`, `/api/v1/utils/generate`). All are listed at the same $0.02 price point.\n\nDocumentation is extremely thin — 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 crawl. The endpoint is live and the x402 challenge is well-formed, but the lack of documentation makes it difficult to know what request bodies are expected or what response payloads look like.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","sentiment-analysis","text-summarization","text-classification","embeddings","analytics-metrics","data-export","price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["llm","finance","geo","data"],"synonyms":["low payment fee API","x402 API","USDC micropayment API","pay-per-call AI","Base network API","crypto API payments","micro-payment endpoints","402 payment API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no technical content.","No OpenAPI or JSON schema describing request/response formats for any endpoint.","The specific purpose of the /api/v2/auth endpoint is unclear — 'Premium API Access' is vague and may be an authentication gateway rather than a data endpoint.","No agents.txt or robots.txt found on the domain."],"endpointUrl":"https://lowpaymentfee.com/api/v2/auth","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/v2/auth","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 well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schemas, and all documentation pages return only a wallet-connect prompt. The actual behavior of the /api/v2/auth endpoint and the 16+ advertised endpoints is undocumented, making this 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":"2026-04-18T21:06:47.003Z","embedding":[-0.029632568,-0.039642334,0.03488159,-0.00466156,0.0107421875,-0.01977539,-0.021057129,0.019348145,0.0758667,-0.039886475,0.027923584,-0.064819336,-0.015914917,-0.036743164,-0.0024776459,0.016906738,0.0041236877,0.0049819946,-0.03375244,0.032348633,0.03616333,-0.0129852295,-0.03237915,0.020019531,-0.008728027,-0.02154541,-0.008743286,-0.0045318604,-0.025512695,-0.034088135,0.047302246,-0.032470703,-0.010879517,-0.0022697449,-0.002521515,-0.0010900497,-0.014335632,0.033966064,0.029754639,-0.021072388,-0.000052690506,-0.056854248,0.020584106,-0.022628784,-0.05279541,-0.019332886,0.025405884,-0.01651001,0.008148193,-0.0062789917,-0.049713135,0.016174316,-0.0016393661,0.0045280457,-0.0064888,0.008613586,-0.017578125,-0.012237549,0.011749268,0.0058670044,0.0044288635,-0.055908203,-0.016830444,-0.0063095093,-0.005012512,0.036865234,0.005432129,0.043823242,-0.0025119781,0.052368164,0.04046631,0.044952393,0.033569336,0.0021953583,0.0033988953,-0.010475159,-0.018051147,0.052703857,-0.013168335,-0.027664185,-0.02986145,-0.016921997,-0.03842163,-0.0070343018,-0.021942139,-0.05847168,-0.024169922,0.031143188,-0.041137695,0.030883789,-0.068115234,0.0006623268,-0.020080566,-0.00970459,0.0059394836,-0.010246277,-0.0034542084,0.021072388,-0.0010652542,0.015899658,-0.016555786,-0.04888916,0.012077332,0.0104522705,0.03942871,0.06329346,0.03652954,0.00983429,-0.00052309036,-0.0049552917,-0.045318604,0.0020046234,-0.012390137,-0.00944519,-0.0008969307,0.012031555,-0.009971619,0.016036987,-0.0395813,0.0014324188,-0.05050659,0.05291748,0.013465881,0.013420105,-0.004425049,-0.049346924,-0.0129852295,-0.0050849915,-0.028060913,-0.012550354,0.0033912659,0.014457703,0.028381348,-0.010643005,-0.033416748,0.015899658,-0.023071289,-0.0021362305,-0.04168701,-0.037139893,0.031829834,-0.028411865,0.018035889,0.043548584,-0.088134766,-0.023742676,-0.02684021,-0.00070905685,-0.0262146,-0.0043144226,0.009025574,0.01713562,-0.033935547,-0.021743774,-0.008728027,-0.03289795,-0.009117126,0.0335083,-0.011299133,0.027893066,-0.010978699,0.022842407,0.01499939,-0.0031032562,0.013336182,0.027664185,0.000890255,-0.07519531,-0.07611084,-0.037506104,0.00016868114,-0.032562256,-0.027633667,-0.008972168,-0.0016088486,-0.06500244,-0.014976501,-0.010292053,-0.0031871796,-0.053131104,-0.009963989,-0.02116394,0.012557983,0.003944397,-0.05114746,-0.030212402,-0.013671875,0.04373169,0.030715942,0.035705566,0.035186768,-0.0051841736,0.06604004,0.0127334595,-0.0046653748,-0.025726318,0.034301758,-0.01676941,0.028030396,-0.004524231,0.014770508,-0.02267456,0.048950195,0.061065674,0.007873535,-0.021347046,-0.0008234978,-0.062683105,-0.06677246,-0.031829834,0.031341553,0.007106781,0.009788513,0.045684814,-0.04006958,-0.034332275,-0.00088119507,0.007865906,0.011878967,0.068847656,0.014442444,0.007865906,0.029251099,0.004798889,-0.04937744,0.047088623,0.036712646,0.011764526,-0.011878967,-0.048339844,0.02798462,0.029342651,-0.04321289,0.014801025,-0.016845703,0.017074585,-0.0046157837,0.008560181,0.015625,-0.011177063,-0.013069153,-0.0124435425,-0.014511108,0.023757935,0.018081665,-0.026626587,-0.02973938,-0.07800293,0.06298828,0.01953125,0.035888672,-0.011680603,0.018585205,-0.02557373,-0.020645142,-0.06756592,0.053588867,0.062683105,-0.007633209,-0.01737976,0.01977539,-0.0026683807,-0.039154053,-0.0031223297,-0.012184143,-0.026977539,-0.022750854,0.016937256,-0.044525146,-0.0030269623,0.029571533,0.027130127,0.04916382,-0.0054512024,-0.053741455,-0.034057617,-0.00041389465,0.007472992,-0.036895752,0.016159058,-0.011383057,0.022750854,0.023361206,0.012397766,0.012466431,0.004951477,0.019195557,-0.01600647,0.0076942444,-0.016830444,-0.019226074,0.010932922,0.002527237,-0.06335449,0.008705139,-0.012275696,0.06958008,-0.03842163,0.03793335,-0.000108122826,0.01838684,0.04284668,0.0020523071,-0.04901123,0.0050735474,0.03488159,0.0087509155,0.04043579,0.009132385,-0.022628784,-0.0007095337,0.07543945,-0.020401001,-0.0046691895,0.024475098,0.00111866,0.024536133,-0.015899658,-0.051757812,-0.049835205,0.0031490326,-0.02645874,0.039855957,-0.009521484,0.023345947,-0.01449585,0.010856628,-0.01260376,0.012458801,-0.033843994,0.0017766953,-0.016220093,0.014602661,-0.0090408325,-0.034942627,-0.00072050095,0.01763916,-0.009216309,0.006942749,0.05001831,0.0068893433,-0.010848999,-0.036956787,-0.026901245,-0.0073013306,-0.017822266,0.015235901,0.030792236,0.02609253,0.055114746,-0.024353027,0.015838623,0.021759033,0.024856567,0.02684021,-0.002670288,-0.016448975,-0.045684814,-0.036010742,-0.031555176,-0.045898438,0.022766113,0.038116455,0.0058784485,0.06100464,0.017532349,0.0008068085,-0.038330078,0.0184021,-0.045440674,-0.01322937,0.034240723,-0.014213562,-0.04449463,-0.0034809113,-0.000895977,0.003440857,0.03881836,0.014213562,0.026168823,0.06390381,0.04260254,0.0010080338,0.01235199,0.0105896,0.037017822,0.018569946,-0.02078247,-0.029922485,-0.009162903,0.037963867,-0.038635254,-0.031463623,-0.06713867,0.07208252,0.017974854,0.07385254,0.019165039,0.022857666,0.031097412,-0.012130737,-0.0052948,-0.026855469,-0.007926941,-0.028381348,-0.031799316,0.044403076,-0.020690918,-0.0029067993,-0.013427734,0.050048828,-0.011512756,0.01852417,-0.032196045,0.04260254,-0.012367249,-0.003660202,0.024780273,0.014122009,0.062927246,0.054534912,-0.054626465,0.023590088,0.017532349,-0.028427124,0.006713867,0.05456543,-0.019470215,-0.008911133,-0.052978516,-0.027923584,-0.010421753,0.0061569214,-0.049346924,-0.0061569214,0.0107421875,0.014907837,0.04437256,-0.0031032562,-0.01713562,-0.006828308,-0.01852417,-0.05718994,-0.0041618347,-0.047454834,0.01058197,0.01777649,-0.02859497,-0.011184692,-0.01651001,-0.009025574,-0.015625,0.012001038,0.029754639,0.0055351257,-0.056762695,0.054748535,0.004009247,0.013511658,0.020004272,0.04586792,0.040039062,0.008613586,0.040740967,0.021743774,-0.030426025,-0.064575195,0.027130127,-0.036590576,0.016708374,0.018249512,-0.029251099,-0.0056533813,-0.00945282,-0.044647217,-0.025817871,0.022735596,-0.013381958,0.0025539398,0.02180481,-0.030670166,-0.039123535,-0.056549072,-0.0070533752,-0.009208679,0.0680542,-0.0005736351,-0.0019836426,-0.0496521,-0.0060691833,0.027450562,-0.0033340454,0.030166626,-0.014945984,-0.011390686,-0.00018584728,-0.04562378,0.005268097,-0.02166748,0.03225708,-0.019744873,-0.003583908,0.014801025,0.018341064,0.016815186,-0.011245728,0.009544373,0.020462036,-0.03111267,-0.012237549,-0.021881104,0.032958984,0.0112838745,-0.0043296814,-0.040924072,0.044128418,0.01612854,0.03881836,-0.027282715,-0.0016565323,-0.0033168793,0.0013818741,0.023361206,-0.009742737,-0.003370285,-0.016540527,-0.048217773,-0.07043457,0.03668213,-0.0065574646,0.032928467,0.026641846,0.01751709,0.021850586,-0.02633667,0.014457703,0.012809753,-0.023040771,-0.0037727356,-0.028030396,-0.036834717,-0.01826477,-0.014457703,-0.019088745,0.02999878,-0.013397217,0.00058221817,0.0012512207,-0.016113281,0.01576233,0.018188477,-0.013633728,0.028747559,-0.00141716,0.02809143,0.042266846,0.005962372,-0.05621338,0.0340271,0.001115799,0.0062294006,-0.019500732,0.04699707,0.02458191,-0.004825592,-0.0059432983,-0.010017395,-0.024368286,-0.017593384,0.013618469,0.0022411346,0.012107849,-0.0093688965,-0.048950195,0.017288208,-0.010047913,-0.026565552,-0.027770996,0.017807007,0.026641846,-0.03857422,0.012107849,0.014930725,0.05984497,-0.021057129,0.009361267,0.009338379,0.03778076,0.041290283,0.013023376,-0.0073013306,0.017318726,-0.004470825,0.013420105,-0.013946533,-0.01751709,0.022094727,-0.0061569214,0.011405945,0.020812988,0.015975952,-0.029205322,-0.013839722,0.016448975,-0.021102905,-0.020614624,0.03225708,0.027191162,0.024215698,-0.025466919,0.008201599,0.0036010742,-0.013938904,-0.017700195,-0.011390686,0.044647217,-0.0109939575,-0.0075416565,0.024642944,0.0000513196,0.02482605,-0.059265137,-0.0024414062,0.006729126,0.0178833,-0.027008057,-0.05230713,-0.053863525,0.0020198822,0.04647827,0.012229919,0.03265381,0.02355957,-0.00598526,0.014160156,0.029647827,-0.0022697449,-0.01586914,-0.008277893,-0.045806885,-0.019760132,-0.008132935,0.012176514,-0.042816162,0.013267517,-0.012550354,-0.04159546,0.00038695335,-0.011138916,-0.004310608,-0.012283325,0.010375977,0.024810791,0.014709473,0.017807007,-0.020889282,-0.032226562,-0.009300232,0.0014448166,0.017364502,-0.054473877,0.010818481,-0.016433716,-0.0037269592,-0.004333496,0.013053894,0.020080566,0.017730713,0.011276245,0.02558899,-0.050750732,0.040649414,-0.02520752,0.02468872,0.0035133362,-0.04208374,-0.0234375,-0.028778076,-0.007820129,0.04434204,-0.030471802,-0.012321472,-0.031143188,-0.04458618,-0.017105103,-0.056488037,0.035064697,0.04611206,0.04638672,-0.012710571,-0.0015230179,-0.0027332306,-0.012062073,-0.01991272,0.007949829,-0.0074272156,0.024658203,0.030349731,0.005794525,-0.040740967,-0.027069092,-0.008300781,-0.0023345947,-0.048339844,-0.052856445,-0.008926392,-0.0028495789,-0.011329651,-0.010406494,-0.021362305,-0.04840088,0.0046958923,-0.03869629,0.010627747,0.0066375732,0.016189575,0.0065078735,-0.031433105,-0.0034370422,0.00869751,-0.024124146,0.022033691,-0.004322052,-0.008659363,-0.041534424,0.002960205,0.024017334,0.020019531,-0.011238098,-0.01675415,0.00033593178,-0.013542175,-0.044708252,0.0014190674,0.0038070679,-0.0073661804,-0.003042221,0.011230469,-0.059051514,0.0037231445,-0.023803711,-0.011962891,0.027313232,0.021484375,-0.009353638,-0.01133728,0.013046265,0.0015897751,-0.00057411194,-0.027954102,0.017547607,0.01133728,0.010940552,0.022125244,0.047180176,-0.0019435883,-0.032470703,0.013465881,0.015357971,0.011512756,-0.01789856,-0.0007138252,-0.028167725,0.0096588135,-0.008346558,-0.0047798157,-0.028305054,0.003358841,0.078308105,0.007926941,-0.0067634583,-0.014625549,-0.020584106,0.0135650635,0.028640747,-0.045898438,0.0051231384,-0.04425049,0.02166748,-0.02079773,0.0206604,0.005771637,0.018112183,-0.016204834,-0.057281494,-0.0009331703,-0.0029144287,0.005962372,-0.07141113,-0.03024292,-0.07745361,0.0066337585,-0.009941101,-0.023864746,-0.0009441376,0.008666992,-0.026443481,-0.09063721,0.010398865,0.050354004,0.0065841675,0.023849487,-0.0012702942,0.019241333,0.026977539,-0.026138306,0.004837036,0.029891968,-0.02999878,-0.027923584,-0.013534546,0.021774292,-0.011375427,-0.007843018,0.0050582886,0.013633728,0.009613037,-0.008224487,0.016571045,-0.00084352493,0.04046631,-0.017532349,0.00944519,-0.013282776,-0.008544922,0.03967285,-0.053588867,0.016113281,0.010940552,-0.0027618408,0.01550293,0.031555176,0.03604126,-0.043548584,-0.023147583,0.01335907,0.00983429,0.03274536,-0.019821167,0.053833008,0.007320404,-0.0112838745,0.006134033,-0.00466156,-0.0155181885,-0.02973938,-0.025161743,0.0309906,0.020095825,0.0128479,-0.020080566,-0.0060272217,0.022216797,0.010009766,0.0038204193,-0.010269165,-0.004005432,-0.0259552,0.0012645721,0.002527237,0.015281677,0.00055933,0.036224365,0.024246216,0.026489258,0.002735138,-0.011627197,-0.00015723705,0.020721436,-0.0074920654,-0.0109939575,0.021362305,0.014732361,0.018051147,0.017028809,0.010681152,-0.04119873,-0.0064697266,-0.028305054,-0.021896362,0.01399231,-0.012756348,0.0021896362,0.00080251694,0.004306793,-0.014511108,-0.02519226,0.004436493,-0.034851074,-0.016433716,-0.0034599304,-0.014465332,0.019073486,0.018234253,0.006816864,0.0062561035,-0.0015563965,0.050689697,-0.0035076141,-0.0029029846,0.028671265,0.0256958,0.012382507,-0.034240723,0.0004761219,-0.015571594,-0.0045394897,0.004722595,-0.03778076,0.010803223,0.039886475,-0.021102905,0.0062217712,-0.001991272,0.022949219,-0.007904053,-0.00491333,-0.0007200241,0.008262634,-0.0026760101,0.03274536,-0.057403564,0.018981934,0.0042419434,-0.00033545494,-0.016983032,-0.020751953,-0.0143585205,0.011749268,-0.0039634705,-0.010902405,0.04434204,0.004142761,0.028671265,-0.021591187,-0.020996094,0.0008010864,-0.03527832,-0.0154953,0.020507812,-0.0057868958,-0.0006580353,0.0072402954,-0.024765015,0.01902771,-0.036834717,0.008514404,0.0047454834,-0.0018148422,-0.0037441254,-0.010101318,-0.0009384155,-0.0049324036,-0.016906738,-0.006134033,-0.015136719,0.046783447,0.017913818,0.037384033,0.03741455,0.02015686,-0.005306244,-0.046203613,-0.022705078,-0.011726379,-0.012306213,0.015586853,-0.008323669,0.039154053,0.035095215,0.0024261475,0.03024292,0.04598999,0.031951904,-0.0070152283,0.01991272,-0.011169434,0.0118255615,0.0003285408,0.033355713,-0.002149582,0.043029785,-0.037994385,0.025772095,0.008865356,0.015335083,-0.012641907,0.02708435,0.06384277,0.017059326,0.00504303,0.028823853,-0.0019836426,-0.013442993,-0.012191772,-0.023132324,0.036010742,-0.0013542175,0.04849243,0.04046631,-0.004535675,-0.009971619,0.018859863,-0.022842407,-0.025619507,0.056274414,0.021728516,-0.01651001,-0.0034713745,0.0037956238,0.009857178,-0.03527832,-0.015548706,0.025817871,-0.006702423,0.0068740845,-0.009132385,-0.015792847,-0.017532349,0.0038204193,0.014320374,0.017425537,-0.014175415,0.029571533,0.022537231,0.02368164,0.029922485,-0.0013742447,0.020736694,-0.03363037,-0.018859863,0.020019531,0.021194458,-0.010932922,-0.0076446533,0.018432617,0.009529114,0.04522705,0.039215088,-0.017868042,-0.0030021667,0.03010559,0.020584106,0.015083313,0.05001831,0.027893066,0.01084137,0.03970337,0.03262329,0.04498291,-0.044006348,0.01802063,0.006591797,0.011711121,-0.0026359558,-0.015777588,0.011604309,-0.019439697,0.02027893,-0.016281128,-0.016052246,0.024154663,0.016601562,-0.017303467,-0.010215759,-0.011428833,0.014762878,-0.016159058,-0.009796143,0.008201599,-0.0044784546,0.024642944,0.017349243,0.028167725,-0.022613525,0.012130737,-0.014305115,-0.026031494,-0.0021743774,0.030639648,-0.0423584,0.0035514832,-0.008079529,-0.00018262863,-0.0501709,0.0061912537,0.026016235,-0.009963989,0.019515991,0.017501831,-0.004180908,-0.009536743,0.03744507,0.018539429,0.0043678284,-0.00012731552,-0.027526855,0.028457642,0.035003662,-0.00069093704,0.0052871704,-0.010734558,0.006629944,-0.003835678,-0.016418457,0.001493454,-0.013977051,-0.027679443,-0.019317627,0.015304565,0.04345703,0.02746582,0.043121338,-0.023651123,-0.014427185,0.0075798035,0.02217102,-0.012161255,0.0055503845,0.006378174,0.027893066,-0.016647339,0.045318604,0.032958984,0.01134491,0.029281616,-0.0045661926,-0.012130737,0.012924194,-0.012702942,0.036254883,-0.026351929,0.0026626587,-0.0047569275,0.021850586,-0.017425537,-0.03845215,-0.0031909943,-0.027130127,-0.022583008,-0.025787354,0.013671875,0.0023918152,0.026046753,0.033416748,0.03036499,-0.028808594,0.06549072,-0.01979065,0.04449463,-0.00015461445,-0.017227173,0.045928955,0.024307251,0.027633667,0.025161743,0.010261536,-0.03845215,0.0178833,0.029144287,0.029922485,-0.004611969,0.0056991577,-0.017440796,0.037963867,-0.007293701,0.035369873,-0.0069618225,0.0096588135,0.013381958,-0.011695862,-0.0061531067,-0.0037631989,0.00097084045,-0.004688263,0.051635742,-0.009208679,-0.017242432,-0.021255493,-0.018569946,0.033996582,0.003080368,-0.0008172989,-0.0075798035,-0.00970459,0.0065956116,-0.016983032,-0.022506714,0.01826477,0.025253296,-0.053375244,-0.017532349,0.016723633,0.014709473,-0.021347046,0.028030396,0.025299072,-0.0072746277,0.0016565323,0.04107666,-0.0034809113,0.028564453,-0.014030457,0.02935791,0.03564453,0.0048446655,-0.02243042,-0.0017900467,0.012794495,-0.01184082,0.018188477,0.027069092,-0.015548706,-0.0029258728,0.0093307495,-0.020431519,-0.0005841255,0.0012245178,-0.01725769,0.0037841797,-0.013183594,0.00030326843,0.0055656433,0.015602112,0.0047416687,0.018066406,-0.013977051,-0.023040771,0.007106781,0.04043579,0.010871887,-0.021530151,-0.0047454834,0.0048713684,-0.0017652512,-0.033294678,-0.01285553,-0.0056266785,-0.038085938,0.011016846,0.033569336,0.010353088,0.004463196,-0.0154953,0.0012645721,0.027526855,-0.008262634,0.015388489,0.0031490326,-0.0026187897,0.0025501251,-0.020568848,-0.011955261,-0.005996704,-0.016952515,0.00819397,0.029541016,0.013183594,-0.025421143,0.030426025,-0.0035037994,-0.0018072128,0.00011378527,-0.00356102,0.020233154,-0.011459351,-0.000233531,-0.004852295,0.018692017,-0.0015134811,-0.0074882507,-0.010528564,0.045837402,0.047210693,-0.020751953,-0.024612427,0.023025513,0.024642944,0.017105103,0.051574707,0.0020160675,0.04547119,0.017364502,-0.022109985,-0.023162842,0.013343811,-0.007820129,-0.025634766,0.014160156,-0.012649536,0.0008869171,0.015083313,0.007068634,0.000579834,-0.026245117,-0.0236969,-0.016708374,-0.01928711,0.013504028,-0.0040283203,0.025924683,-0.02406311,-0.0061035156,0.001821518,-0.024215698,-0.049713135,-0.008178711,-0.0033931732,-0.015159607,-0.054534912,0.0029449463,-0.02003479,0.0087890625,-0.02281189,0.009613037,-0.015945435,0.034057617,-0.008506775,0.0006656647,0.008140564,0.01727295,0.0368042,-0.011779785,0.021530151,-0.02960205,-0.013000488,-0.0184021,0.018753052,-0.021438599,0.011955261,0.007949829,0.035614014,0.013977051,0.0014190674,0.012054443,-0.0154800415,-0.00737381,-0.009239197,-0.027526855,-0.03213501,0.035614014,0.016723633,-0.0009174347,-0.012771606,0.028060913,-0.027877808,-0.0019989014,0.016067505,0.0345459,0.012260437,0.025848389,-0.012458801,0.004928589,-0.0158844,-0.005832672,-0.01626587,0.006164551,0.011886597,0.009681702,-0.009437561,0.00541687,0.024871826,-0.017181396,-0.005672455,0.03540039,0.016860962,-0.010894775,0.036010742,0.021911621,0.00945282,-0.013641357,-0.005065918,0.020843506,0.051940918,0.0079193115,0.012962341,0.006855011,0.007167816,-0.0073280334,0.0071487427,0.009918213,-0.018463135,-0.035369873,-0.016159058,-0.032806396,0.031799316,-0.004814148,-0.0050315857,-0.009864807,0.019699097,-0.01424408,-0.04562378,-0.016540527,0.024490356,0.012039185,-0.014587402,-0.009887695,0.009490967,0.022628784,-0.02960205,0.0019445419,-0.046569824,-0.04046631,-0.028030396,-0.020050049,0.019760132,0.012458801,-0.01713562,0.0012903214,0.0032138824,0.00046658516,-0.0029067993,0.029708862,-0.0012350082,-0.0005803108,0.015335083,0.021011353,-0.021759033,0.018814087,-0.011856079,-0.0066833496,-0.0071411133,-0.0014038086,0.0059661865,-0.024291992,0.026367188,-0.016052246,-0.008659363,0.032684326,-0.0023612976,0.022125244,-0.030395508,-0.0055351257,-0.0051612854,-0.014564514,0.038635254,-0.01701355,-0.022705078,0.010246277,-0.007385254,-0.02029419,-0.005706787,0.020019531,0.027145386,-0.0013685226,0.033813477,-0.0115356445,-0.008239746,0.010887146,0.010009766,-0.017532349,0.013442993,0.027160645,0.010726929,0.0033397675,-0.009773254,-0.00983429,-0.034606934,-0.0065612793,0.017852783,-0.0016727448,-0.016723633,0.03161621,0.008628845,0.049682617,0.0019683838,0.015975952,0.006790161,0.0011129379,0.032043457,0.0034503937,0.048614502,0.01134491,-0.027770996,0.006855011,0.002696991,-0.027069092,0.010398865,-0.005203247,0.0037136078,-0.03845215,0.011940002,-0.011001587,0.016220093,-0.007534027,0.013870239,-0.023895264,-0.003967285,-0.033843994,-0.011726379,-0.046875,0.0071754456,0.032196045,0.0025291443,0.021881104,0.0003812313,-0.018188477,0.030822754,0.037353516,0.022247314,-0.024124146,-0.022125244,0.0072288513,-0.00440979,0.0082473755,0.0060806274,-0.022857666,-0.02218628,-0.003145218,-0.023162842,0.007835388,-0.010307312,0.026824951,0.011383057,0.0027770996,-0.010887146,0.023422241,0.00083589554,0.0033454895,0.010559082,-0.007686615,0.027557373,0.027145386,-0.02406311,0.012565613,0.0066184998,-0.050720215,0.05279541,-0.0154953,0.047302246,-0.014045715,0.015068054,-0.031829834,-0.025772095,-0.029525757,0.008766174],"createdAt":"2026-04-18T18:34:05.339Z","updatedAt":"2026-04-23T20:01:30.067Z","lastSeenAt":"2026-04-23T20:01:30.067Z","tsv":"'/api':197 '/api/v1/analytics/metrics':157 '/api/v1/analytics/reports':158 '/api/v1/crypto/gas':173 '/api/v1/crypto/quotes':172 '/api/v1/data/export':159 '/api/v1/data/insights':160 '/api/v1/finance/prices':170 '/api/v1/finance/rates':171 '/api/v1/utils/convert':179 '/api/v1/utils/generate':180 '/api/v1/utils/geocode':177 '/api/v1/utils/validate':178 '/api/v2/ai/classify':166 '/api/v2/ai/embeddings':167 '/api/v2/ai/sentiment':164 '/api/v2/ai/summarize':165 '/api/v2/auth':118 '/docs':195 '/pricing':196 '/readme':199 '/request':18,36 '0.02':17,35,67,141,187 '000':135 '20':134 '402':97 '402 payment API' '6':145 'Base network API' 'USDC micropayment API' 'access':124 'across':152 'addit':150 'advertis':149 'ai':11,29,161 'ai/ml':55 'analyt':12,30,54,156 'analytics-metrics' 'api':5,23,43,79,123 'avail':226 'base':8,26,75,137 'base-unit':136 'bodi':254 'broad':48 'call':4,22 'caller':100 'categori':154 'chain':106 'challeng':91,130,237 'collect':49 'commit':87 'connect':205 'conversion' 'cost':66 'cover':10,28 'crawl':229 'crypto API payments' 'crypto-gas-estimates' 'data':53,58,155 'data-export' 'decim':146 'detail':212 'difficult':249 'document':190,221,246 'embeddings' 'enabl':42 'endpoint':51,65,117,151,231 'everi':64 'exampl':225 'exchange-rates' 'expect':256 'extrem':192 'financ':13,31,168 'finance/web3':57 'form':241 'four':153 'general':61 'general-purpos':60 'geocoding' 'i.e':140 'infer':56 'infrastructur':175 'key':80 'know':251 'lack':244 'learn':163 'like':262 'limit':83 'list':120,183 'live':233 'look':261 'low payment fee API' 'lowpaymentfee.com':37 'machin':162 'make':247 'micro':109 'micro-pay':108 'micro-payment endpoints' 'network':76 'offer':46 'on-chain':104 'openapi':216 'page':200 'paid':70 'pay':2,20 'pay-per-cal':1,19 'pay-per-call AI' 'pay-per-request' 'payload':260 'payment':90,110 'per':3,21,68 'platform':44,148 'point':189 'premium':122 'price':188 'price-feeds' 'probe':116 'prompt':207 'purpos':62 'rate':82 'receiv':112 'render':202 'request':69,131,253 'request/response':219 'respons':98,114,259 'return':93,126 'schema':220 'sentiment-analysis' 'settl':101 'sinc':142 'span':52 'spec':217 'standard':96 'suit':6,24 'technic':211 'text-classification' 'text-summarization' 'thin':193 'unit':138 'upfront':86 'usag':224 'usdc':9,27,72,107,139,143 'usdc-base-network' 'use':144 'util':15,33,63,176 'valid':128 'validation' 'via':102 'wallet':206 'web3':169 'well':240 'well-form':239 'x402':41,89,129,236 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"2f0effd3-c169-4580-a2e3-0de4433b80b5","listingId":"9faff6e5-25c8-4a6b-a183-0b9b363186be","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/v2/auth","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:05.339Z"}],"sources":[{"listingId":"9faff6e5-25c8-4a6b-a183-0b9b363186be","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v2/auth","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:05.339Z","lastSeenAt":"2026-04-23T20:01:30.067Z"}],"details":{"listingId":"9faff6e5-25c8-4a6b-a183-0b9b363186be","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v2/auth \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base-unit USDC on Base network","source_url":"https://lowpaymentfee.com/api/v2/auth"},{"claim":"All 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 across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v2/auth"}],"useCases":["Running AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes and gas estimates via micro-payments","Geocoding or data validation on a per-request payment basis","Exporting analytics data or generating reports with no subscription"],"bestFor":["Agents or bots that need keyless, pay-as-you-go API access","Developers prototyping with low-cost per-call pricing on Base","Web3-native applications that prefer on-chain settlement over traditional billing"],"notFor":["High-volume production workloads where $0.02/request adds up quickly without bulk discounts","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:03:09.034Z"},"updatedAt":"2026-04-23T20:01:30.067Z"}}