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Datasets:
vstantch
/
x402-pii-corpus

Tasks:
Token Classification
Modalities:
Text
Formats:
json
Sub-tasks:
named-entity-recognition
Languages:
English
Size:
1K - 10K
ArXiv:
Tags:
pii
privacy
x402
payments
Synthetic
named-entity-recognition
Libraries:
Datasets
pandas
Polars
License:
Dataset card Data Studio Files
xet
 Community
1
Dataset Viewer
Auto-converted to Parquet Duplicate
id
stringlengths
9
9
category
stringclasses
7 values
resource_url
stringclasses
203 values
description
stringclasses
109 values
reason
stringclasses
64 values
pii_positive
bool
2 classes
labels
listlengths
0
2
syn-00000
media
https://cdn.example.com/v1/stream/public/video123
CDN asset delivery
false
[]
syn-00001
medical
https://ehr.example.com/api/v1/schedules
Appointment scheduling
false
[]
syn-00002
media
https://cdn.example.com/v1/stream/public/video123
Public media stream
false
[]
syn-00003
financial
https://finance.example.com/v1/instruments/public
FX rate lookup
false
[]
syn-00004
media
https://cdn.example.com/v1/stream/public/video123
CDN asset delivery
false
[]
syn-00005
data_access
https://api.example.com/v1/users/Aisha Patel/profile
Record retrieval for patient SSN 312 45 6789
request_id=abc123
true
[ { "field": "resource_url", "entity_type": "PERSON", "start": 33, "end": 44, "original_text": "Aisha Patel", "surface_form": "full_name" }, { "field": "description", "entity_type": "US_SSN", "start": 33, "end": 44, "original_text": "312 45 6789", "surface_form": "s...
syn-00006
financial
https://api.example.com/v1/fx/rates
Card limit check
false
[]
syn-00007
medical
https://labs.example.com/api/v1/panels/lipid
EHR access
false
[]
syn-00008
generic
https://api.example.com/v2/catalog/items
Service request
false
[]
syn-00009
data_access
https://storage.example.com/v1/buckets/public/objects/file.csv
User data export
request_id=abc123
false
[]
syn-00010
data_access
https://storage.example.com/v1/buckets/public/objects/file.csv
Public dataset access
ssn=312456789
true
[ { "field": "reason", "entity_type": "US_SSN", "start": 4, "end": 13, "original_text": "312456789", "surface_form": "no_sep" } ]
syn-00011
compute
https://compute.example.com/v1/instances/inst-abc123
HPC resource request
false
[]
syn-00012
media
https://assets.example.c…ic/landscape.jpg
Public media stream
false
[]
syn-00013
financial
https://finance.example.com/v1/instruments/public
Card limit check
false
[]
syn-00014
data_access
https://api.example.com/v1/records?ssn=421-67-8910
User data export
request_id=abc123
true
[ { "field": "resource_url", "entity_type": "US_SSN", "start": 39, "end": 50, "original_text": "421-67-8910", "surface_form": "dashes" } ]
syn-00015
data_access
https://data.example.com/public/datasets/open-data
Public dataset access
false
[]
syn-00016
financial
https://payments.example.com/v1/fees/schedule
Card limit check
false
[]
syn-00017
medical
https://ehr.example.com/api/v1/schedules
Medical records for maria-garcia
clinic_ref=CL-001
true
[ { "field": "description", "entity_type": "PERSON", "start": 20, "end": 32, "original_text": "maria-garcia", "surface_form": "slug" } ]
syn-00018
data_access
https://data.example.com/public/datasets/open-data
User data export
false
[]
syn-00019
generic
https://api.example.com/v2/users/usr_abc123
Service request
false
[]
syn-00020
compute
https://compute.example.com/v1/instances/inst-abc123
HPC resource request
false
[]
syn-00021
data_access
https://storage.example.com/users/bob.jones@corp.io/exports
User data export
true
[ { "field": "resource_url", "entity_type": "EMAIL_ADDRESS", "start": 34, "end": 51, "original_text": "bob.jones@corp.io", "surface_form": "bare" } ]
syn-00022
data_access
https://data.example.com/public/datasets/open-data
Public dataset access
request_id=abc123
false
[]
syn-00023
medical
https://health.example.com/api/appointments
EHR access
false
[]
syn-00024
financial
https://finance.example.com/v1/instruments/public
Card limit check
account=DE89370400440532013000
true
[ { "field": "reason", "entity_type": "IBAN_CODE", "start": 8, "end": 30, "original_text": "DE89370400440532013000", "surface_form": "de" } ]
syn-00025
financial
https://finance.example.com/v1/instruments/public
Card limit check
false
[]
syn-00026
data_access
https://data.example.com/public/datasets/open-data
User data export
request_id=abc123
false
[]
syn-00027
financial
https://api.example.com/v1/fx/rates
Account balance query for IBAN NL91ABNA0417164300
true
[ { "field": "description", "entity_type": "IBAN_CODE", "start": 31, "end": 49, "original_text": "NL91ABNA0417164300", "surface_form": "nl" } ]
syn-00028
ai_inference
https://api.example.com/v1/completions
Embedding generation
false
[]
syn-00029
compute
https://compute.example.com/v1/gpu/inventory
HPC resource request
job_ref=job-abc
false
[]
syn-00030
media
https://assets.example.c…ic/landscape.jpg
CDN asset delivery
user=user123@example.com
true
[ { "field": "reason", "entity_type": "EMAIL_ADDRESS", "start": 5, "end": 24, "original_text": "user123@example.com", "surface_form": "numeric_local" } ]
syn-00031
compute
https://hpc.example.com/v1/queue/default
Compute job submission
job_ref=job-abc
false
[]
syn-00032
generic
https://api.example.com/v1/status
API resource access
request_id=req-999
false
[]
syn-00033
compute
https://jobs.example.com/v1/jobs/job-7a3f2c/status
HPC resource request
false
[]
syn-00034
ai_inference
https://ai.example.com/v1/models/gpt-4
LLM completion task
agent_id=agent-v1
false
[]
syn-00035
medical
https://health.example.com/api/appointments
Medical records for Garcia,Maria
true
[ { "field": "description", "entity_type": "PERSON", "start": 20, "end": 32, "original_text": "Garcia,Maria", "surface_form": "last_first" } ]
syn-00036
compute
https://compute.example.com/v1/instances/inst-abc123
Compute job submission
job_ref=job-abc
false
[]
syn-00037
media
https://assets.example.c…ic/landscape.jpg
CDN asset delivery
false
[]
syn-00038
financial
https://api.example.com/v1/fx/rates
FX rate lookup
account=DE89370400440532013000
true
[ { "field": "reason", "entity_type": "IBAN_CODE", "start": 8, "end": 30, "original_text": "DE89370400440532013000", "surface_form": "de" } ]
syn-00039
media
https://cdn.example.com/v1/stream/public/video123
CDN asset delivery
false
[]
syn-00040
generic
https://api.example.com/v2/catalog/items
Data retrieval
request_id=req-999
false
[]
syn-00041
financial
https://api.example.com/v1/fx/rates
FX rate lookup
false
[]
syn-00042
ai_inference
https://ai.example.com/v1/models/llm-7b/invoke?user=john_smith
AI inference request for user IRIS@DOMAIN.COM
true
[ { "field": "resource_url", "entity_type": "PERSON", "start": 52, "end": 62, "original_text": "john_smith", "surface_form": "underscore" }, { "field": "description", "entity_type": "EMAIL_ADDRESS", "start": 30, "end": 45, "original_text": "IRIS@DOMAIN.COM", "surfac...
syn-00043
ai_inference
https://inference.example.com/v1/embed
Embedding generation
false
[]
syn-00044
data_access
https://data.example.com/public/datasets/open-data
Record retrieval for patient SSN 312-45-6789
true
[ { "field": "description", "entity_type": "US_SSN", "start": 33, "end": 44, "original_text": "312-45-6789", "surface_form": "dashes" } ]
syn-00045
media
https://cdn.example.com/v1/stream/public/video123
Public media stream
false
[]
syn-00046
financial
https://payments.example.com/cards/371449635398431/limit
FX rate lookup
true
[ { "field": "resource_url", "entity_type": "CREDIT_CARD", "start": 35, "end": 50, "original_text": "371449635398431", "surface_form": "amex" } ]
syn-00047
medical
https://labs.example.com/api/v1/panels/lipid
EHR access
clinic_ref=CL-001
false
[]
syn-00048
financial
https://payments.example.com/v1/fees/schedule
FX rate lookup
false
[]
syn-00049
compute
https://compute.example.com/v1/gpu/inventory
Compute job submission
false
[]
syn-00050
compute
https://hpc.example.com/v1/queue/default
HPC resource request
owner=bob.jones@corp.io
true
[ { "field": "reason", "entity_type": "EMAIL_ADDRESS", "start": 6, "end": 23, "original_text": "bob.jones@corp.io", "surface_form": "bare" } ]
syn-00051
financial
https://finance.example.com/v1/instruments/public
Account balance query for IBAN NL91ABNA0417164300
true
[ { "field": "description", "entity_type": "IBAN_CODE", "start": 31, "end": 49, "original_text": "NL91ABNA0417164300", "surface_form": "nl" } ]
syn-00052
financial
https://finance.example.com/v1/instruments/public
FX rate lookup
account=GB29NWBK60161331926819
true
[ { "field": "reason", "entity_type": "IBAN_CODE", "start": 8, "end": 30, "original_text": "GB29NWBK60161331926819", "surface_form": "gb" } ]
syn-00053
compute
https://hpc.example.com/v1/queue/default
HPC resource request
job_ref=job-abc
false
[]
syn-00054
media
https://assets.example.com/private/john_smith/gallery
Public media stream
true
[ { "field": "resource_url", "entity_type": "PERSON", "start": 35, "end": 45, "original_text": "john_smith", "surface_form": "underscore" } ]
syn-00055
financial
https://payments.example.com/v1/fees/schedule
Account balance query for IBAN GB29NWBK60161331926819
true
[ { "field": "description", "entity_type": "IBAN_CODE", "start": 31, "end": 53, "original_text": "GB29NWBK60161331926819", "surface_form": "gb" } ]
syn-00056
ai_inference
https://inference.example.com/v1/embed
LLM completion task
agent_id=agent-v1
false
[]
syn-00057
data_access
https://api.example.com/v2/items/42
User data export
request_id=abc123
false
[]
syn-00058
financial
https://payments.example.com/v1/fees/schedule
Account balance query for IBAN GB29NWBK60161331926819
true
[ { "field": "description", "entity_type": "IBAN_CODE", "start": 31, "end": 53, "original_text": "GB29NWBK60161331926819", "surface_form": "gb" } ]
syn-00059
media
https://cdn.example.com/v1/stream/public/video123
CDN asset delivery
false
[]
syn-00060
media
https://assets.example.c…ic/landscape.jpg
CDN asset delivery
false
[]
syn-00061
ai_inference
https://ai.example.com/v1/models/gpt-4
Embedding generation
user=carol_92@health-records.org
true
[ { "field": "reason", "entity_type": "EMAIL_ADDRESS", "start": 5, "end": 32, "original_text": "carol_92@health-records.org", "surface_form": "bare" } ]
syn-00062
medical
https://labs.example.com/api/v1/panels/lipid
EHR access
false
[]
syn-00063
generic
https://api.example.com/health
Data retrieval
false
[]
syn-00064
financial
https://finance.example.com/v1/instruments/public
FX rate lookup
false
[]
syn-00065
generic
https://api.example.com/v2/catalog/items
Data retrieval
false
[]
syn-00066
financial
https://api.example.com/v1/fx/rates
Account balance query for IBAN DE89370400440532013000
true
[ { "field": "description", "entity_type": "IBAN_CODE", "start": 31, "end": 53, "original_text": "DE89370400440532013000", "surface_form": "de" } ]
syn-00067
media
https://media.example.com/public/feed/trending
CDN asset delivery
false
[]
syn-00068
financial
https://api.example.com/v1/fx/rates
FX rate lookup
false
[]
syn-00069
medical
https://ehr.example.com/api/v1/schedules
EHR access
false
[]
syn-00070
ai_inference
https://api.example.com/v1/tokenize
LLM completion task
agent_id=agent-v1
false
[]
syn-00071
data_access
https://api.example.com/v2/items/42
Public dataset access
request_id=abc123
false
[]
syn-00072
ai_inference
https://ai.example.com/v1/models/gpt-4
Embedding generation
false
[]
syn-00073
financial
https://payments.example.com/v1/fees/schedule
FX rate lookup
false
[]
syn-00074
medical
https://ehr.example.com/api/v1/schedules
EHR access
clinic_ref=CL-001
false
[]
syn-00075
financial
https://api.example.com/v1/fx/rates
FX rate lookup
false
[]
syn-00076
data_access
https://data.example.com/public/datasets/open-data
Public dataset access
false
[]
syn-00077
generic
https://api.example.com/v2/catalog/items
Data retrieval
request_id=req-999
false
[]
syn-00078
generic
https://api.example.com/v2/search?q=openapi
Service request
false
[]
syn-00079
medical
https://health.example.com/patient/J.Smith/records
Medical records for Aisha
true
[ { "field": "resource_url", "entity_type": "PERSON", "start": 35, "end": 42, "original_text": "J.Smith", "surface_form": "abbreviated" }, { "field": "description", "entity_type": "PERSON", "start": 20, "end": 25, "original_text": "Aisha", "surface_form": "first_onl...
syn-00080
media
https://assets.example.c…ic/landscape.jpg
CDN asset delivery
user=carol_92@health-records.org
true
[ { "field": "reason", "entity_type": "EMAIL_ADDRESS", "start": 5, "end": 32, "original_text": "carol_92@health-records.org", "surface_form": "bare" } ]
syn-00081
data_access
https://data.example.com/public/datasets/open-data
Public dataset access
request_id=abc123
false
[]
syn-00082
data_access
https://storage.example.com/v1/buckets/public/objects/file.csv
User data export
request_id=abc123
false
[]
syn-00083
data_access
https://storage.example.com/v1/buckets/public/objects/file.csv
User data export
ssn=312 45 6789
true
[ { "field": "reason", "entity_type": "US_SSN", "start": 4, "end": 15, "original_text": "312 45 6789", "surface_form": "spaces" } ]
syn-00084
generic
https://api.example.com/health
API resource access
false
[]
syn-00085
media
https://media.example.com/content/Maria Garcia/feed
CDN asset delivery
true
[ { "field": "resource_url", "entity_type": "PERSON", "start": 34, "end": 46, "original_text": "Maria Garcia", "surface_form": "full_name" } ]
syn-00086
data_access
https://data.example.com/datasets/Garcia,Maria/private
Public dataset access
true
[ { "field": "resource_url", "entity_type": "PERSON", "start": 34, "end": 46, "original_text": "Garcia,Maria", "surface_form": "last_first" } ]
syn-00087
media
https://assets.example.c…ic/landscape.jpg
CDN asset delivery
false
[]
syn-00088
financial
https://finance.example.com/v1/instruments/public
FX rate lookup
false
[]
syn-00089
financial
https://finance.example.com/transfers?from=NL91ABNA0417164300&amount=100
Account balance query for IBAN GB29NWBK60161331926819
true
[ { "field": "resource_url", "entity_type": "IBAN_CODE", "start": 43, "end": 61, "original_text": "NL91ABNA0417164300", "surface_form": "nl" }, { "field": "description", "entity_type": "IBAN_CODE", "start": 31, "end": 53, "original_text": "GB29NWBK60161331926819", "...
syn-00090
media
https://assets.example.c…ic/landscape.jpg
Public media stream
false
[]
syn-00091
financial
https://payments.example.com/v1/fees/schedule
FX rate lookup
false
[]
syn-00092
data_access
https://data.example.com/public/datasets/open-data
User data export
false
[]
syn-00093
compute
https://hpc.example.com/v1/queue/default
Compute job submission
false
[]
syn-00094
medical
https://ehr.example.com/records/312 45 6789/history
Lab results for patient maria-garcia
true
[ { "field": "resource_url", "entity_type": "US_SSN", "start": 32, "end": 43, "original_text": "312 45 6789", "surface_form": "spaces" }, { "field": "description", "entity_type": "PERSON", "start": 24, "end": 36, "original_text": "maria-garcia", "surface_form": "slu...
syn-00095
media
https://assets.example.com/private/Garcia,Maria/gallery
Public media stream
user=frank@data.example.net
true
[ { "field": "resource_url", "entity_type": "PERSON", "start": 35, "end": 47, "original_text": "Garcia,Maria", "surface_form": "last_first" }, { "field": "reason", "entity_type": "EMAIL_ADDRESS", "start": 5, "end": 27, "original_text": "frank@data.example.net", "sur...
syn-00096
financial
https://payments.example.com/v1/fees/schedule
Card limit check
false
[]
syn-00097
generic
https://api.example.com/v2/catalog/items
Data retrieval
request_id=req-999
false
[]
syn-00098
data_access
https://data.example.com/public/datasets/open-data
Public dataset access
request_id=abc123
false
[]
syn-00099
ai_inference
https://ai.example.com/v1/models/gpt-4
LLM completion task
false
[]
End of preview. Expand in Data Studio

x402 PII Metadata Corpus

Synthetic labelled corpus of 2,000 x402 payment metadata triples for PII filter evaluation. Released alongside the paper "Hardening x402: Privacy-Preserving Agentic Payments via Pre-Execution Metadata Filtering".

Dataset description

Each record represents one x402 payment metadata triple (resource_url, description, reason) drawn from seven API categories. 36% of samples contain at least one synthetic PII entity injected into one of the three fields, with ground-truth span labels.

Fields

Field Type Description
id string Sample identifier (syn-NNNNN)
category string API category (media, medical, financial, data_access, generic, compute, ai_inference)
resource_url string Synthetic x402 resource URL
description string Payment description field
reason string Payment reason field
pii_positive bool true if any PII entity is present
labels list Ground-truth entity annotations (see below)

Label schema 

{
  "entity_type": "EMAIL_ADDRESS",
  "field": "description",
  "start": 24,
  "end": 45,
  "value": "<synthetic value>"
}

Entity types: PERSON, EMAIL_ADDRESS, US_SSN, IBAN_CODE, CREDIT_CARD, PHONE_NUMBER.

Corpus statistics

Split Samples
train (all) 2,000
Entity type Count Share
PERSON 321 36.7%
EMAIL_ADDRESS 313 35.8%
IBAN_CODE 96 11.0%
US_SSN 85 9.7%
PHONE_NUMBER 32 3.7%
CREDIT_CARD 28 3.2%

Usage 

from datasets import load_dataset

ds = load_dataset("vstantch/x402-pii-corpus")
print(ds["train"][0])

Citation 

@misc{stantchev2026hardeningx402,
  title   = {Hardening x402: Privacy-Preserving Agentic Payments via Pre-Execution Metadata Filtering},
  author  = {Stantchev, Vladimir},
  year    = {2026},
  eprint  = {2604.11430},
  archivePrefix = {arXiv},
  primaryClass  = {cs.CR},
}

Corpus data also archived at IEEE DataPort:

@misc{stantchev2026dataset,
  author       = {Stantchev, Vladimir},
  title        = {Hardening x402: PII Filter Corpus, Sweep Results, and Live Ecosystem Data},
  year         = {2026},
  publisher    = {IEEE DataPort},
  doi          = {10.21227/kpsz-nq73},
  howpublished = {IEEE DataPort, \url{https://doi.org/10.21227/kpsz-nq73}},
}
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Paper for vstantch/x402-pii-corpus