# LLM API LLM API offers pay per call inference on a curated set of frontier models. OpenAI compatible chat completions, Anthropic native messages, the Responses API, and embeddings, billed by exact token usage. Responses are non streaming; set stream to false. The full model catalog is available with an LLM API account at llmapi.ai. ## API reference, endpoint lookup and prices **[LLM API API catalog: endpoints, request parameters, prices and payment methods](https://agents.llmapi.ai/zcj/dw0sjbfhybxy/zeroclick/agent/guide).** Tell the seller advisor what you want to accomplish. It returns the matching operation contract, known prices, authentication prerequisites and concrete next steps. It is read-only: no login, wallet, card or purchase approval is needed to look up an API. It never executes a sale. Available API services: Claude Opus 5 (5% off), Claude Sonnet 5 (5% off), DeepSeek V4 Flash (5% off), DeepSeek V4 Pro (5% off), Gemini 3.1 Pro (Preview) (5% off), Gemini 3.7 Flash (5% off), GLM 5.3 (5% off), GPT-5.1 (5% off), GPT-5.2 (5% off), GPT-5 Mini (5% off), Grok 4.6 (5% off), Jina Embeddings v4 (5% off), Kimi K2.6 (5% off), Text Embedding 3 Large (5% off), Text Embedding 3 Small (5% off), Token Counting. **Suggested next request:** GET [task guide](https://agents.llmapi.ai/zcj/dw0sjbfhybxy/zeroclick/agent/guide?goal=URL_ENCODED_TASK). Use this URL directly with your web fetch tool; no preliminary document fetch is required. Include known inputs and desired output in the goal. Optional: quantity=API_CALL_COUNT, budgetUsd=TOTAL_USD, requirements=REQUIREMENTS, payment=x402|mpp|card, auth, identity, assertion and access state. Omit unknowns. Do not equate output items with API calls or guess a call count. For private task details or known request arguments, POST https://agents.llmapi.ai/zcj/dw0sjbfhybxy/zeroclick/agent/guide with Content-Type: application/json. Example: {"intent":"quote","goal":"YOUR_TASK","purchase":{"budgetUsd":"5.00"}}. Replace the task and budget with known facts; budgetUsd is a string. Include known buyerState, paymentCapabilities and arguments. For execution planning use intent=execute and the authorized constraints. Exact fields: [request schema](https://agents.llmapi.ai/zcj/dw0sjbfhybxy/zeroclick/agent/schema). GET and POST are alternatives, not mandatory stages. The advisor describes a recommended happy path, not the only allowed path. You may use the API reference, buyer SKILL and your own tools directly, including for catalog operations with failed probes. Missing guidance or an unverified probe is not a policy refusal. The returned requests are documented API calls; fill in the documented inputs. Check usage cost AND minimum cash required against the budget. For needs_input, supply only missing facts. Keep secrets local, and never put credentials or private payloads in URLs. Unknown does not mean absent. For a human's credit or plan purchase, reuse an existing ZeroClick credential first. Otherwise use their signed-in Link account for identity as well as payment, sharing their email only if they agree. An empty or expired Link credential list means request a credential, not fall back to anonymous. Follow [Link identity setup](https://agents.llmapi.ai/zcj/dw0sjbfhybxy/auth.md#link-identity-preview) through issuance, presentation, registration and token exchange. Anonymous auth remains available for agents acting on their own behalf with no human in the loop. Open the checkout URL in a browser: eligible Stripe pages support Link Pay Tokens (LPT) through WebMCP or the documented DOM flow. Follow this storefront's /payment/card.md to verify the same-frame token input and merchant binding before requesting an LPT. Token submission requires payment authorization. If unavailable, privately send the checkout URL to your human to pay. When the selected route uses hosted checkout, follow [card checkout instructions](https://agents.llmapi.ai/zcj/dw0sjbfhybxy/payment/card.md) before requesting a token. LPT goes only to Stripe, never to the advisor or ZeroClick API. Poll the returned statusUrl before using credit or retrying delivery. Verify delivery; a payment or HTTP 202 is not completion. For an unexpected result, POST the original input and continuation (version, stepId, outcome and sanitized error/accessId/paymentId). Reconcile uncertain payments or writes before retrying. Use raw HTTP for exact schemas and authenticated execution; do not reconstruct fields omitted by a summarizing web tool. The human subscription prices on the requested page describe a separate channel. Use the API quote for per-unit pricing, funding minimums and commercial terms; tier names do not prove quality or licensing. For an alternative documented path, use the [buyer SKILL](https://agents.llmapi.ai/zcj/dw0sjbfhybxy/SKILL.md) or [full direct workflow reference](https://agents.llmapi.ai/zcj/dw0sjbfhybxy/llms-full.txt). Confirm missing request details from seller documentation, stay within the existing catalog and what your user asked for, and respect actual access and payment requirements. ## References - [Buyer SKILL](https://agents.llmapi.ai/zcj/dw0sjbfhybxy/SKILL.md): read as a skill when needed. - [Complete reference](https://agents.llmapi.ai/zcj/dw0sjbfhybxy/llms-full.txt): advisor workflow and direct fallback. - [Catalog](https://agents.llmapi.ai/zcj/dw0sjbfhybxy/manifest.json): services, plans and prices. - [OpenAPI](https://agents.llmapi.ai/zcj/dw0sjbfhybxy/openapi.json): exact operation schemas. ## Guides - [Create text embeddings with LLM API's embeddings API](https://agents.llmapi.ai/zcj/dw0sjbfhybxy/guides/embeddings.md): One endpoint serves Text Embedding 3 Small, Text Embedding 3 Large and Jina Embeddings v4, billed per input token from prepaid credit. - [Chat Completions, Anthropic Messages or Responses API on LLM API](https://agents.llmapi.ai/zcj/dw0sjbfhybxy/guides/request-formats.md): Every LLM API chat model answers on Chat Completions, Anthropic Messages and the Responses API. Keep your request format and change only the model id. - [Call Claude, GPT, Gemini and DeepSeek from one API with LLM API](https://agents.llmapi.ai/zcj/dw0sjbfhybxy/guides/quickstart.md): Call Claude, GPT, Gemini and DeepSeek models through one OpenAI-compatible API: one free credential, one prepaid credit balance, billed by exact token usage. - [How much does LLM API cost per token?](https://agents.llmapi.ai/zcj/dw0sjbfhybxy/guides/pricing.md): Every LLM API model is billed by exact token usage at 5% below list price, drawn from one prepaid credit balance. Count tokens first to estimate input. - [LLM API models: model ids, context sizes and per-token prices](https://agents.llmapi.ai/zcj/dw0sjbfhybxy/guides/models.md): LLM API's chat and embedding models with model ids, context sizes and per-token prices, grouped by price. Switch models by changing one field.