{"uid":"cap_MZbHXIISHfnQD0flq1wiJ","slug":"one-engine-array-head-first-16-items-tier-1-f04b313a","name":"ONE Engine Array Head – First 16 Items (Tier 1)","description":"Return first 16 array items. Tier 1/10 adds richer diagnostics.","url":"https://one-search.one-engine.workers.dev/v6/array-head/items-16/t1?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.0005","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":"$0.0005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_xhPguh6AqfT1Qf_ffpY4j","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.0005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the first 16 elements of a submitted array, with Tier 1 richer diagnostic metadata included in the response.","exampleAgentPrompt":"I have a long list of items and I need just the first 16 entries — can you slice the array head for me and include the diagnostic details?","exampleUseCases":[{"title":"Preview large dataset head","prompt":"I've got a huge JSON array of product records — can you grab just the first 16 items so I can preview what the data looks like before processing the whole thing?"},{"title":"Debug array pipeline output","prompt":"My data pipeline is producing a big array and I want to inspect the first 16 elements along with any diagnostic info to make sure the structure looks right."},{"title":"Paginate agent memory efficiently","prompt":"I have an array of 200 stored memories and I only want to feed the first 16 into the next step of my agent workflow — can you slice just the head of the list?"}],"resultDescription":"A JSON response containing up to 16 elements taken from the start of the submitted array, plus Tier 1 diagnostic metadata such as total input length, slice boundaries, and structural information about the extracted subset.","failureModes":["Empty array input returns an empty result set","Malformed JSON body causes a 400 parse error","Array with fewer than 16 items returns all available items (no error)","Payment failure or missing x402 header results in a 402 Payment Required response","Oversized payload may trigger request size limits"],"whenToPreferThis":"Choose this endpoint when you need a deterministic, cheap, stateless head-slice of exactly 16 items from an array — especially when you also want lightweight diagnostic metadata (Tier 1) about the operation. It is ideal for agent workflows that need to preview, paginate, or sample the leading elements of a list without processing the full dataset. Prefer it over generic slicing logic when you want a pay-per-call micro-utility with audit diagnostics baked in.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-15T00:43:58.322Z","isFirstParty":false,"canonicalSlug":"one-engine-array-head-first-16-items-tier-1-f04b313a"}