open402
HTTP 402 payment protocol for machine-to-machine commerce — reference implementation in Python
Installation
pip install open402
Zero dependencies — pure Python protocol types, header parsing, and version negotiation.
Usage
Parse a 402 Response
from open402 import X402PaymentChallenge, parse_www_authenticate
# Parse the WWW-Authenticate header from a 402 response
challenge = parse_www_authenticate(
'x402 chain="solana" token="USDC" amount="0.05" address="SolAddr..."'
)
# challenge.chain == "solana"
# challenge.token == "USDC"
# challenge.amount == "0.05"
# challenge.address == "SolAddr..."
Build an Authorization Header
from open402 import build_authorization
header_value = build_authorization(tx_hash="5abc...def")
# "x402 5abc...def"
Version Negotiation
from open402 import negotiate_version
result = negotiate_version(client_version="v1.0", server_versions=["v1.0", "v0.9"])
# result == "v1.0"
Protocol Flow
Client Server
│ │
│── GET /api/resource ────────────────▶│
│ │
│◀── 402 Payment Required ─────────────│
│ WWW-Authenticate: x402 ... │
│ │
│ [Parse challenge → Pay on-chain] │
│ │
│── GET /api/resource ────────────────▶│
│ Authorization: x402 <tx_hash> │
│ │
│◀── 200 OK ───────────────────────────│
Compatible with the Coinbase x402 standard.
Part of Ag402
open402 is the protocol layer of the Ag402 project.
Use it standalone for protocol parsing, or with ag402-core for the full payment engine.
1 maintainer
Metadata
1 maintainer
Release files for open402 0.1.20
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | Provenance | |
|---|---|---|---|---|
| open402-0.1.20.tar.gz | 8.2 kB | With provenance | Details |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| open402-0.1.20-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 16.3 kB
Release files / open402-0.1.20.tar.gz
| Download URL | open402-0.1.20.tar.gz |
|---|---|
| Size | 8.2 kB |
| Tags | Source |
|
SHA-256 checksum How to use checksums |
c94a3f7ab6be33d6024e352b99e0dab24559b950fc33c44d47ef41a14b089cc4
|
|
BLAKE2b-256 checksum How to use checksums |
24eda034332ef40ce9068a0c9f9f9d15a54717cef88aa37a5e8f3634565787ff
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/6.1.0 CPython/3.13.7
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Mar 15, 2026.
Transparency logRelease files / open402-0.1.20-py3-none-any.whl
| Download URL | open402-0.1.20-py3-none-any.whl |
|---|---|
| Size | 8.1 kB |
| Tags | Python 3 |
|
SHA-256 checksum How to use checksums |
91c7ed6d709fb25de42dee58495f5489be4f253d0c93d7452cf9aec507b87b63
|
|
BLAKE2b-256 checksum How to use checksums |
0a16961d02e7bfdac47a29526caf9a5cf26d78803ee97a808b9aca40621d6272
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/6.1.0 CPython/3.13.7
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Mar 15, 2026.
Transparency logSecurity for open402 0.1.20
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
Full provenance
All 2 files in this release have been uploaded with provenance metadata.
Attestation for open402-0.1.20.tar.gz
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Mar 15, 2026.
Transparency logA note on package security
PyPI is a repository for distributing packages, not a service for auditing them. While third-party security researchers and our staff do their best to detect and remove malicious packages, PyPI cannot guarantee the quality, security or suitability of any given package.
To learn more about protecting yourself from malicious actors, visit our package security documentation.
