{"uid":"cap_J-jZHhFoJi2N-yYHw2O0N","slug":"signalharness-prompt-token-budget-estimator-612adb31","name":"SignalHarness Prompt Token Budget Estimator","description":"Explore 330 pay-per-call x402 API services and 27 agent-native digital products, with Base USDC pricing, secure Polar checkout, and free discovery.","url":"https://signalharness.ai/api/agent/services/prompt_token_budget_estimate/invoke","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"request_json":{"type":"string","maxLength":65536,"minLength":2}}},"responseSchema":{"type":"json","example":{"replay":false,"result":{"warnings":["Verify the caller-supplied data before relying on this result."],"service_id":"prompt_token_budget_estimate","analysis_json":"{\"example\":\"schema-valid caller-supplied data\"}","evidence_scope":"caller_supplied_data"},"status":"succeeded","receipt":{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","usage":[],"status":"succeeded","network":"eip155:8453","artifacts":[],"endedAtMs":0,"latencyMs":0,"paymentId":"example-payment","receiptId":"example-receipt","requestId":"example-request","serviceId":"prompt_token_budget_estimate","executionId":"example-execution","startedAtMs":0,"amountAtomic":"5000","resultSha256":"d2f74257ed217974638a0b50508a760084b29338c2a851d7940ef1cd67e37f85","serviceVersion":"1.0.0","settlementReference":"0x0000000000000000000000000000000000000000000000000000000000000000"},"artifacts":[],"requestId":"example-request","executionId":"example-execution"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_wszIV0SPHH7QyoMDJUKWa","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Estimates the token budget required for a given prompt or request JSON, helping agents plan LLM cost and capacity before execution.","exampleAgentPrompt":"Before I send this API request payload to the language model, can you estimate the token budget it will need? Here's the request JSON: {\"model\":\"gpt-4\",\"messages\":[{\"role\":\"user\",\"content\":\"Summarize the quarterly earnings report for Apple Inc.\"}]}","exampleUseCases":[{"title":"Pre-flight token check for LLM pipeline","prompt":"I'm about to send a large structured prompt to GPT-4 and I want to make sure it won't exceed the context window — can you estimate the token budget for this request JSON before I send it: {\"model\":\"gpt-4\",\"messages\":[{\"role\":\"system\",\"content\":\"You are a financial analyst...\"},{\"role\":\"user\",\"content\":\"Analyze the following 10-K filing...\"}]}"},{"title":"Cost planning for agent batch prompts","prompt":"I'm running 500 agent tasks tonight and I need to estimate the average token budget per request so I can project my LLM spend — here's a representative request JSON from my batch: {\"model\":\"claude-3\",\"messages\":[{\"role\":\"user\",\"content\":\"Extract all named entities from this document: ...\"}]}"},{"title":"Validate prompt fits within model limits","prompt":"Can you check whether this prompt request will fit within a 4096-token budget? Here's the JSON: {\"prompt\":\"Given the following long contract text, identify all indemnification clauses and summarize each one...\",\"max_tokens\":1000}"}],"resultDescription":"Returns a JSON object containing an analysis_json field with the token budget estimate, a warnings array for data quality notices, the service_id, evidence_scope indicating the data came from caller-supplied input, and a full execution receipt with payment metadata, latency, and a result SHA256 hash for verification.","failureModes":["Invalid or malformed request_json string returns a validation error","request_json exceeding 65536 characters is rejected","Missing required request_json field causes a 400-level error","Ambiguous or empty JSON objects may trigger warnings in the analysis","Payment failure or insufficient USDC balance prevents execution"],"whenToPreferThis":"Choose this endpoint when you need a lightweight, pay-per-call token budget estimate before committing to a full LLM API call — especially useful in cost-sensitive agent pipelines, batch processing workflows, or when validating that prompts stay within model context limits. Prefer this over client-side tokenizer libraries when you want a verifiable, receipted estimate with an audit trail on Base.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T19:01:44.441Z","isFirstParty":false}