{"uid":"cap_OsWd17vMQZdsDQpD_TYnK","slug":"agent-prep-token-estimator-06d8de78","name":"Agent Prep – Token Estimator","description":"Pre-LLM utilities for AI agents: structural JSON diff, JSON path listing, token estimation, text chunking, and truncation. Pay with USDC via x402 — no API keys.","url":"https://agent-prep.annushka1190.workers.dev/v1/tokens/estimate","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"body":{"type":"object"},"type":{"const":"http"},"method":{"enum":["POST"]},"bodyType":{"const":"json"}}}}},"responseSchema":{"type":"json","example":{"chars":48,"words":8,"tokens":12}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_a8L3V7XQ8DNJqrfQU1KNW","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Estimates token count, word count, and character count for a given HTTP request body, enabling pre-LLM cost and context-window planning.","exampleAgentPrompt":"Before I send this payload to the LLM, estimate how many tokens, words, and characters it contains so I know if it fits in the context window.","exampleUseCases":[{"title":"Context window budget check","prompt":"I'm about to send a big JSON document to GPT-4 — can you estimate how many tokens it will consume so I know whether I need to chunk it first?"},{"title":"LLM cost pre-flight estimation","prompt":"Estimate the token count for this prompt payload so I can figure out how much this API call will cost before I send it."},{"title":"Agent prompt size validation","prompt":"Before my agent submits this system prompt plus user message to the model, check how many tokens and words the combined body adds up to."}],"resultDescription":"Returns a JSON object with three fields: 'tokens' (estimated LLM token count), 'words' (word count), and 'chars' (character count) for the submitted request body.","failureModes":["Missing required 'input' field returns validation error","Non-POST method specified in 'method' field is rejected","Malformed JSON body causes parse error","Payment not attached or insufficient USDC causes 402 Payment Required response","Empty body may return zero counts without error"],"whenToPreferThis":"Use this endpoint when you need a lightweight, pay-per-call token estimator with no API key setup — ideal for AI agents that need to perform pre-LLM context-window checks or cost estimation on arbitrary JSON payloads before dispatching to an LLM provider.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T12:39:37.652Z","isFirstParty":false}