Claude API for AI agents, pay per token, no API key or account
Claude API for AI agents, pay per token, no API key or account - POST an Anthropic Messages request (messages, system, tools, tool_choice, thinking) and get the full response back. Claude Opus 5, Sonnet 5, Haiku 4.5. Tool calling / function calling supported. Billed on actual usage at list price + 25%, capped at $0.25 per call (x402 upto scheme). LLM inference, chat completions, keyless Claude, Anthropic proxy. Free price sheet: /llm/models.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
339 msmedian answer time
$0.25listed price per call
$0.25price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://clink-lithium-vault.fly.dev/llm/chat
| Category | Market data |
|---|---|
| Provider host | clink-lithium-vault.fly.dev |
| Networks | eip155:8453 |
| Payment schemes | upto |
| Self-reported calls, 30 days | 3 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.25 | 339 ms |
Example input (from the provider)
{
"body": {
"max_tokens": 64,
"messages": [
{
"content": "Say hi in five words.",
"role": "user"
}
],
"model": "haiku"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"max_tokens": {
"description": "1-4096, default 1024",
"type": "integer"
},
"messages": {
"description": "Anthropic Messages API messages array; first role must be user",
"type": "array"
},
"model": {
"enum": [
"haiku",
"sonnet",
"opus",
"claude-haiku-4-5",
"claude-sonnet-5",
"claude-opus-5"
],
"type": "string"
},
"system": {
"description": "Optional system prompt",
"type": "string"
},
"tools": {
"description": "Optional tool definitions (Anthropic tool-use schema)",
"type": "array"
}
},
"required": [
"messages"
]
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}