Pay-per-call chat on GPT-6.1, Claude, Gemini and Grok over x402. No API key; a failed call is free.
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Chat completion on a frontier model: GPT-6.1 Sol and Terra, GPT-5.5, Claude Sonnet 5.5 and Haiku 5.5, Gemini 3.8 Flash, Grok 4.7, GPT-6 Luna (default anthropic/claude-haiku-5.5; see the models tool). Same shape as OpenAI chat: messages, optional max_tokens (default 1024, max 8192), temperature, tools. Price is quoted per call from your input size and max_tokens: (estimated input tokens x input rate + max_tokens x output rate) x 1.4 + $0.0005, minimum $0.002; the 402 states the exact amount. Charged only if the model call succeeds. Thinking models (GPT-5.5, Gemini, Grok, gpt-oss) spend part of max_tokens on reasoning: give them room, or set reasoning_effort (default low). Prompts go to the model's provider and are not stored by Payperwork. No streaming.
Pick your client. Values in capitals, like YOUR_TOKEN, are yours to fill in.
claude mcp add --transport http ai https://payperwork.app/ai/mcp
Chat completion on a frontier model: GPT-6.1 Sol and Terra, GPT-5.5, Claude Sonnet 5.5 and Haiku 5.5, Gemini 3.8 Flash, Grok 4.7, GPT-6 Luna (default anthropic/claude-haiku-5.5; see the models tool). Same shape as OpenAI chat: messages, optional max_tokens (default 1024, max 8192), temperature, tools. Price is quoted per call from your input size and max_tokens: (estimated input tokens x input rate + max_tokens x output rate) x 1.4 + $0.0005, minimum $0.002; the 402 states the exact amount. Charged only if the model call succeeds. Thinking models (GPT-5.5, Gemini, Grok, gpt-oss) spend part of max_tokens on reasoning: give them room, or set reasoning_effort (default low). Prompts go to the model's provider and are not stored by Payperwork. No streaming.
| Argument | Type | Description |
|---|---|---|
| stop | any | |
| model | string | |
| tools | array | |
| top_p | number | |
| messages* | array | |
| max_tokens | integer | |
| temperature | number | |
| tool_choice | any | |
| response_format | any | |
| reasoning_effort | string |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"messages"
],
"properties": {
"stop": {
"anyOf": [
{
"type": "string"
},
{
"type": "array",
"items": {
"type": "string"
}
}
]
},
"model": {
"type": "string"
},
"tools": {
"type": "array",
"items": {}
},
"top_p": {
"type": "number",
"maximum": 1,
"minimum": 0
},
"messages": {
"type": "array",
"items": {
"type": "object",
"required": [
"role",
"content"
],
"properties": {
"name": {
"type": "string"
},
"role": {
"type": "string"
},
"content": {},
"tool_calls": {},
"tool_call_id": {
"type": "string"
}
},
"additionalProperties": {}
},
"maxItems": 200,
"minItems": 1
},
"max_tokens": {
"type": "integer",
"maximum": 8192,
"minimum": 1
},
"temperature": {
"type": "number",
"maximum": 2,
"minimum": 0
},
"tool_choice": {},
"response_format": {},
"reasoning_effort": {
"enum": [
"none",
"low",
"medium",
"high"
],
"type": "string"
}
}
}List the available models with provider rates, the pricing formula and limits. Free.
No arguments.
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {}
}We read every tool's name, description and inputs the way the model will, looking for instructions hidden from you. A clean result means no warning signs, not a guarantee. Scanned Nov 1, 2026.