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Endpoints are paid per successful call via x402 or MPP (USDC on Base); an unpaid request returns 402 with payment metadata in the WWW-Authenticate header.","contact":{"email":"hello@openverbs.com"}},"x-discovery":{"ownershipProofs":["0xb1401a71756f51464a9962db12f1eb3e9522490cd20010b06d00cf7b7770acfd5f79721f9dfdf2643f8cecd29af3bde9ec133941a386042b32d9886053a70de61b","0xc1c1f11793e18a00fcb7072421f26e89fb75b6aa517fa84370564991f4b10efa024f6f57e4e67eefd20cf46cc01fc5a62d793fa8fbcda04f26c946a3433d73f91b","0x676b474af0ef9ed4809b5d12d2e789b36e52d56215b21f601d71f76620e36ec630347116a7b2b349a3c3681e5db0fbfa76c4169a676b6d6f27864d0e5017284a1c","0xc2ab96522515ed9e9bc4f1a241b774bd48df42e951ddbf7f6aa8fc76f5a96a20421703e1ec402ce7eb1e4eabea3b6e4e4129cf39d56ea91cf4fcf38561fc94fc1c"]},"servers":[{"url":"https://nato.openverbs.com"}],"paths":{"/health":{"get":{"summary":"Health check","security":[],"responses":{"200":{"description":"Healthy","content":{"application/json":{"schema":{"type":"object","properties":{"ok":{"type":"boolean"},"service":{"type":"string"},"version":{"type":"string"}}}}}}}}},"/v1/spell":{"post":{"summary":"Spell with the phonetic alphabet","description":"Spell text using the NATO/ICAO phonetic alphabet (A→Alfa, B→Bravo, …), including digits and spaces (→Space). 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Price: $0.002000 USDC per successful payment.","tags":["nato phonetic spelling","spell with nato alphabet","icao alphabet api","text to phonetic words","radio spelling alphabet","convert letters to alfa bravo"],"requestBody":{"required":true,"content":{"application/json":{"schema":{"type":"object","properties":{"text":{"type":"string","minLength":1,"description":"Text to spell (A-Z, 0-9, space)."}},"required":["text"],"additionalProperties":false}}}},"responses":{"200":{"description":"`{ words, text }`.","content":{"application/json":{"schema":{"type":"object","description":"`{ words, text }`."}}}},"400":{"description":"Invalid request; no payment is attempted"},"402":{"description":"Payment required; x402/MPP metadata returned in headers"},"502":{"description":"Upstream provider error after payment verification"}},"x-payment-info":{"amount":"2000","currency":"0x20c000000000000000000000b9537d11c60e8b50","description":"Spell text using the NATO/ICAO phonetic alphabet (A→Alfa, B→Bravo, …), including digits and spaces (→Space). 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Price: $0.002000 USDC per successful payment.","tags":["decode nato phonetic","phonetic words to text","nato alphabet decoder","unspell radio words","alfa bravo to letters","icao words decoder"],"requestBody":{"required":true,"content":{"application/json":{"schema":{"type":"object","properties":{"words":{"type":"string","minLength":1,"description":"Phonetic words separated by spaces or commas."}},"required":["words"],"additionalProperties":false},"example":{"words":"Sierra Oscar Sierra"}}}},"responses":{"200":{"description":"`{ text }`.","content":{"application/json":{"schema":{"type":"object","description":"`{ text }`."}}}},"400":{"description":"Invalid request; no payment is attempted"},"402":{"description":"Payment required; x402/MPP metadata returned in headers"},"502":{"description":"Upstream provider error after payment verification"}},"x-payment-info":{"amount":"2000","currency":"0x20c000000000000000000000b9537d11c60e8b50","description":"Turn a string of phonetic words back into text (\"Sierra Oscar Sierra\" → \"SOS\"). 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