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pack.openverbs.com JSON Encoder (MessagePack/CBOR)
x402
pack.openverbs.com JSON Encoder (MessagePack/CBOR) is a paid API for AI agents from pack.openverbs.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-28).
Serializes any JSON value into a compact MessagePack or CBOR binary byte stream, returned as a base64, base64url, or hex string with byte length.
Price / call$0.004
Success—
StatusUnknown
How this service works
Serialize a JSON value into a compact MessagePack or CBOR byte stream, returned as a base64 (default), base64url or hex string, along with the byte length.
Output
Returns the binary-encoded byte stream as a base64, base64url, or hex string (default base64), along with the byte length of the encoded output. The format used (msgpack or cbor) is also reflected in the response.
Example use cases
Compact API payload for IoT device
“Take this sensor reading JSON {"temp":23.5,"humidity":60,"ts":1710000000} and encode it as MessagePack in base64url so I can send a compact binary payload to the device.”
CBOR encoding for WebAuthn flow
“Encode this credential JSON {"id":"abc123","type":"public-key"} into CBOR format and return it as a hex string — I need it for a WebAuthn authentication step.”
Binary cache key for Redis storage
“Serialize this JSON config object {"env":"prod","version":3,"flags":["featureA"]} into MessagePack as base64 so I can store it as a compact binary blob in Redis.”
Technical details
Endpoint
POSThttps://pack.openverbs.com/v1/encode?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to convert a JSON value into a compact binary wire format (MessagePack or CBOR) with a text-safe envelope (base64/hex), particularly for IoT payloads, WebAuthn, caching, or any protocol that benefits from smaller byte footprint than JSON. Prefer over manual encoding libraries when operating in an agentic context where calling a remote API is simpler than bundling native codec dependencies.
Side effects
- Invalid or missing 'data' field — returns validation error
- Unsupported format value (not 'msgpack' or 'cbor') — returns enum validation error
- Unsupported outputEncoding value — returns enum validation error
- Payment not provided or invalid (x402 protocol error) — returns 402 Payment Required
- Malformed JSON body — returns parse error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| data | — | Any JSON value (object, array, string, number, boolean or null). |
| format | string | Binary format, one of msgpack, cbor. |
| outputEncoding | string | Envelope encoding of the bytes (base64, base64url, hex). Default base64. |
Tags
x402
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