C

Surf Inference

https://inference.surf.cascade.fyi 69% (73/105)
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Compliance Checks

✓ All paid ops declare 402 response MUST 10pt
✗ All x-payment-info valid MUST 10pt
✗ Challenge has Cache-Control: no-store MUST 5pt
✗ Challenge digest on POST SHOULD 3pt
✓ Challenge has expires SHOULD 3pt
✗ Challenge has Problem Details SHOULD 2pt
✓ Challenge has required params MUST 5pt
✓ Challenge has WWW-Authenticate MUST 5pt
✓ Challenge returns 402 MUST 10pt
✓ Correct Content-Type MUST 5pt
✗ Has Cache-Control on discovery SHOULD 5pt
✓ Has input schemas SHOULD 5pt
✗ Has llms.txt SHOULD 5pt
✓ Has /openapi.json at root MUST 10pt
✓ Has required top-level fields MUST 10pt
✓ Served over HTTPS MUST 10pt
✗ Uses standard categories SHOULD 2pt
2 issues
  • 402 response missing Cache-Control: no-store
  • POST endpoint challenge missing digest parameter (SHOULD per spec)

Paid Operations (1)

POST /v1/chat/completions dynamic
Chat completion

OpenAI-compatible chat completion endpoint with x402 or MPP payment. Supports streaming via SSE. Flat-priced models: qwen/qwen-2.5-7b-instruct ($0.001). Dynamic-priced models (scales with prompt size and max_tokens): moonshotai/kimi-k2.5, minimax/minimax-m2.7, z-ai/glm-5, x-ai/grok-4.1-fast, x-ai/grok-4.20-beta, x-ai/grok-4.20-multi-agent-beta, anthropic/claude-sonnet-4.5, anthropic/claude-sonnet-4.6, anthropic/claude-opus-4.5, anthropic/claude-opus-4.6. Search-enabled variants (include live X/Twitter + web search via xAI native tools): x-ai/grok-4.1-fast:online, x-ai/grok-4.20-beta:online, x-ai/grok-4.20-multi-agent-beta:online. Default max_tokens: 4096 when omitted.

Amount
dynamic
Currency
-
Method
x402, mpp
Intent
-
402 Declared
Yes
Non-standard x-payment-info fields: pricingMode: quote protocols: [x402 mpp]

Input Schema

{
  "$ref": "#/components/schemas/ChatCompletionBody"
}

Response Schema (200)

{
  "$ref": "#/components/schemas/ChatCompletionResponse"
}

Payment Methods

Methods
tempo (from challenge)
Intents
charge, session (from challenge)
Currencies (discovery)
-
Currency (challenge)
USDC.e on Tempo (Tempo)
Multiple Challenges
Yes

Recipients

  • 0x2BB201f1bb056eb738718BD7A3ad1BEF24b883bb
Per-endpoint breakdown
POST /v1/chat/completions
0x2BB201f1bb056eb738718BD7A3ad1BEF24b883bb

Security

TLS Version
TLSv1.3
Challenge ID Unique
Yes
Challenge ID Length
43
Digest Binding
-

Uptime

Discovery
Reachable (171ms)
Challenge
Reachable (90ms)
Last Checked

Schema Completeness

Paid Operations
1
With Input Schema
1
With Description
1

Documentation

Homepage
-
API Reference
-
llms.txt
-

Discovery

OpenAPI URL
https://inference.surf.cascade.fyi/openapi.json
OpenAPI Version
3.1.0
Service Version
1.0.0
Document Size
4795 bytes
Document Hash
f8dbce3af58e02d29afab8fab8af2114514193b58139668d8134ce171f6f554d

Version History (2 snapshots)

Scan snapshots
Date Grade Score Response Status
2026-04-06 C 69% 213ms Up
2026-04-07 C 69% 481ms Up