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PennyRail OpenAI-Compatible Embeddings
x402
PennyRail OpenAI-Compatible Embeddings is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Generates vector embeddings for input text or data using an OpenAI-compatible embeddings API, accessible via micropayment settlement
Price / call$0.002
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns an object containing one or more embedding vectors (arrays of floating-point numbers) representing the semantic content of the input, in a format compatible with the OpenAI embeddings API response schema.
Example use cases
Semantic search index population
“Generate an embedding vector for this product description so I can store it in my vector database for semantic search: 'Lightweight hiking boots with waterproof membrane and ankle support, ideal for trail running.'”
RAG pipeline document ingestion
“I need to embed this paragraph for my retrieval-augmented generation pipeline — can you vectorize it? 'Climate change refers to long-term shifts in global temperatures and weather patterns, primarily driven by human activity since the mid-20th century.'”
Sentence similarity comparison
“Get me the embedding vectors for these two sentences so I can compute their cosine similarity: 'Machine learning is a subset of artificial intelligence' and 'AI encompasses techniques like deep learning and neural networks'.”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/mini/ai.v1-embeddings--openai-compatible-embeddingsWhen to prefer
Choose this endpoint when you need OpenAI-format embeddings with per-call micropayment billing (0.002 USDC) rather than a subscription or API-key-based model. It is ideal for agents operating in x402-enabled payment ecosystems, serverless or ephemeral environments where managing API keys is undesirable, or when you need drop-in OpenAI embeddings compatibility without provisioning an OpenAI account.
Side effects
- Missing or malformed 'input' field returns a validation error
- Payment of 0.002 USDC not settled via x402 protocol results in 402 Payment Required
- Empty input object may produce zero-length or error response
- Rate limiting or upstream OpenAI API errors may cause 5xx responses
- Oversized input exceeding token limits may be rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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