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Perplexity Agent (via paysponge x402)
x402
Perplexity Agent (via paysponge x402) is a paid API for AI agents from pplx.x402.paysponge.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-09).
Generates an AI response for a given input using selectable models, with optional web search and reasoning capabilities, paid per-call via x402/USDC.
Price / call$0.01
Success—
StatusUnknown
How this service works
Create Agent Response
Output
Returns a structured response object containing a unique response ID, the model used, the generated text output, token usage counts (input, output, total), and a detailed cost breakdown in USD (input cost, output cost, tool call costs, total cost). May also include function call outputs if tools were used.
Example use cases
Example prompt
“Use the Perplexity agent endpoint to answer this question with web search enabled: 'What are the latest developments in fusion energy as of this week?' — use the sonar model and give me a detailed, reasoned response.”
Technical details
Endpoint
POSThttps://pplx.x402.paysponge.com/v1/agent?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a single-call AI generation with optional live web search and reasoning, billed per-call via x402 USDC micropayments — ideal for agents that want to pay only for what they use without API key management. Prefer over the async Sonar endpoint when you want a synchronous response. Prefer over the Search endpoint when you need a synthesized natural language answer rather than raw web content.
Side effects
- Missing required 'input' field returns a 400 validation error
- Invalid model ID returns an error indicating unrecognized provider/model format
- Insufficient x402 USDC payment returns a 402 Payment Required response
- Rate limiting or quota exceeded returns a 429 error
- Malformed function_call_output (missing call_id) causes a 400 error
- Network timeout on long-running reasoning tasks
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | — | Input content - either a string or array of input items |
| model | string | Model ID in provider/model format (e.g., "xai/grok-4-1", "openai/gpt-4o"). If models is also provided, models takes precedence. Required if neither models nor preset is provided. |
| tools | array | Tools available to the model |
| models | array | Model fallback chain. Each model is in provider/model format. Models are tried in order until one succeeds. Max 5 models allowed. If set, takes precedence over single model field. The response.model will reflect the model that actually succeeded. |
| preset | string | Preset configuration name (e.g., "fast-search", "pro-search", "deep-research"). Pre-configured model with system prompt and search parameters. Required if model is not provided. |
| stream | boolean | If true, returns SSE stream instead of JSON |
| max_steps | integer | Maximum number of research loop steps. If provided, overrides the preset's max_steps value. Must be >= 1 if specified. Maximum allowed is 10. |
| reasoning | object | |
| instructions | string | System instructions for the model |
| response_format | object | Specifies the desired output format for the model response |
| max_output_tokens | integer | Maximum tokens to generate |
| language_preference | string | ISO 639-1 language code for response language |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| idrequired | string | Unique identifier for the response |
| error | object | Error information returned when a request fails |
| modelrequired | string | Model used for generation |
| usage | object | Token usage and cost information for a Responses API request |
| objectrequired | string | Object type in API responses |
| outputrequired | array | Array of output items (messages, search results, tool calls) |
| statusrequired | string | Status of a response or output item |
| created_atrequired | integer | Unix timestamp when the response was created |
Tags
x402
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