Linkrra Synap: Open-Model LLMs
Linkrra Synap: OpenAI-compatible chat completions API (LLM inference) for chat, coding and agent workloads. Pay per call in USDC on Base via x402 - no account, no API key. Model "auto" picks the cheapest fit. From $0.001 per call, usage-priced per token above that (GET /v1/models). Streaming supported. Product site: https://synap.linkrra.com
Offering
- Provider
- pool.linkrra.com
- Method
- POST
- Offering type
- Api Endpoint
- Transport type
- http
- Category
- Api
- Delivery
- Not provided
- Pricing model
- Not provided
- x402 version
- 2
Endpoint context
- URL
https://pool.linkrra.com/api/billing/x402/chat/completions- MIME type
- application/json
- First seen
- 2026-10-16T02:01:31.612Z
- Last seen
- Tags
- Inference, LLM, chat-completion, openai-compatible, ai-compute
Payment pricing
x402 payment terms are the authoritative price for calling this endpoint.
- Payment option 1
- 0.001 USDC
Atomic price: 1000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
{
"scheme": "exact",
"network": "eip155:8453",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "1000",
"payTo": "0xAA0a350f6080940c138A8A50C0Fa8c8387782eb4"
}
]Observed health
- Status
- Healthy
- Latest latency
- 1160 ms
- Average latency
- 783 ms
- HTTP status
- 200
- Last checked
- Reachability
- 100% over 14 checks
Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.
Input schema
{
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"additionalProperties": false,
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"type": "string",
"enum": [
"POST"
]
},
"bodyType": {
"type": "string",
"enum": [
"json"
]
},
"body": {
"type": "object",
"required": [
"model",
"messages"
],
"properties": {
"model": {
"type": "string",
"enum": [
"auto",
"qwen/qwen3-vl-30b-a3b-instruct",
"qwen/qwen3-30b-a3b",
"qwen3-coder-30b",
"gpt-oss-20b",
"gemma-4-26b-a4b-it",
"meta/muse-glimmer-30b"
],
"description": "\"auto\" = cheapest of our self-hosted models that fits, or name one."
},
"messages": {
"type": "array",
"minItems": 1,
"description": "OpenAI-format chat history, oldest first: [{role, content}].",
"items": {
"type": "object",
"required": [
"role",
"content"
],
"properties": {
"role": {
"type": "string",
"enum": [
"system",
"user",
"assistant",
"tool"
]
},
"content": {
"description": "Text, or an array of OpenAI content parts."
}
}
},
"examples": [
[
{
"role": "user",
"content": "Write a Python function that reverses a string"
}
]
]
},
"max_tokens": {
"type": "integer",
"minimum": 1,
"maximum": 4096,
"default": 4096,
"description": "Completion token cap. The price is quoted for the prompt plus this cap."
},
"stream": {
"type": "boolean",
"default": false,
"description": "true = stream OpenAI-format Server-Sent Events."
}
}
}
}
}Output schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"max_tokens": {
"default": 4096,
"description": "Completion token cap. The price is quoted for the prompt plus this cap.",
"maximum": 4096,
"minimum": 1,
"type": "integer"
},
"messages": {
"description": "OpenAI-format chat history, oldest first: [{role, content}].",
"examples": [
[
{
"content": "Write a Python function that reverses a string",
"role": "user"
}
]
],
"items": {
"properties": {
"content": {
"description": "Text, or an array of OpenAI content parts."
},
"role": {
"enum": [
"system",
"user",
"assistant",
"tool"
],
"type": "string"
}
},
"required": [
"role",
"content"
],
"type": "object"
},
"minItems": 1,
"type": "array"
},
"model": {
"description": "\"auto\" = cheapest of our self-hosted models that fits, or name one.",
"enum": [
"auto",
"qwen/qwen3-vl-30b-a3b-instruct",
"qwen/qwen3-30b-a3b",
"qwen3-coder-30b",
"gpt-oss-20b",
"gemma-4-26b-a4b-it"
],
"type": "string"
},
"stream": {
"default": false,
"description": "true = stream OpenAI-format Server-Sent Events.",
"type": "boolean"
}
},
"required": [
"model",
"messages"
],
"type": "object"
},
"bodyType": {
"enum": [
"json"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"description": "200 chat.completion (SSE if stream=true). 402 payment required or insufficient (challenge in PAYMENT-REQUIRED). 202 settlement pending. 400 invalid body or payment header. 404 model not offered. 409 payment already used. 503 no node serving the model, nothing charged. 500/502 facilitator, chain or model-server error; if inference fails after settlement the amount stays credited to the paying wallet.",
"properties": {
"example": {
"properties": {
"choices": {
"description": "choices[0].message.content is the reply.",
"type": "array"
},
"model": {
"description": "The model that answered.",
"type": "string"
},
"payment": {
"description": "USDC paid + Base tx hash; any unused amount stays credited to the payer.",
"type": "object"
},
"usage": {
"description": "Tokens billed: prompt, completion, total.",
"type": "object"
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type",
"example"
],
"type": "object"
}
},
"required": [
"input",
"output"
],
"type": "object"
}